JP4007989B2 - Microwave detector - Google Patents

Description

  The present invention relates to a microwave detector, and more particularly to setting a reception sensitivity and improving a structure for changing an alarm pattern based on a received microwave.

  In recent years, many automatic speed measuring devices for measuring the speed of a vehicle have been installed around the road. As an example of an automatic speed measuring device, a microwave in a predetermined frequency band is emitted toward a vehicle, and the reflected wave is received to measure the traveling speed of the vehicle.

  On the other hand, in order to detect the presence of such an automatic speed measuring device, a microwave detector configured to detect a microwave emitted from the automatic speed measuring device and output an alarm is conventionally known.

  By the way, the same frequency band as the microwave output from the human body detection sensor in the automatic door is used for the frequency of the microwave emitted from the automatic speed measuring device. Therefore, if the microwave detector is operated when traveling in the city, an erroneous alarm may be output in response to the microwave output from the human body detection sensor.

  If such false alarms are frequently output, it is annoying, or conversely, the driver gets used to the alarms, and the alarms are issued based on the microwaves from the automatic speed measuring device to be detected. May be judged as a false alarm.

  Therefore, in order to suppress the occurrence of such problems, for example, the reception sensitivity of the microwave detector is changed, and when traveling in the city, the reception sensitivity is set low to make it difficult to react to human body detection sensors, etc. During traveling, the reception sensitivity is increased to reliably detect the microwave from the automatic speed measuring device and to issue an alarm.

  Furthermore, on highways, etc., the distance traveled per unit time is long, so there is a demand to detect the presence of an automatic speed measuring device from the earliest possible time (distant position). For the reason, it is rare to travel at such a high speed, and there may be no problem even if the presence of the automatic speed measuring device cannot be detected. For this reason, there is also a demand for changing the setting of reception sensitivity.

  As a specific procedure for changing the reception sensitivity, it is common to select one of the preset reception sensitivities by operating a button on the microwave detector.

  In addition, information on places where automatic speed measuring devices are installed, regions where they are heavily deployed, or regions where vehicles loaded with speed measuring devices for measuring vehicle speed frequently appear is a magazine. And other information media. Therefore, when traveling in the corresponding area, the presence of the automatic speed measuring device or the like can be reliably detected by increasing the reception sensitivity.

  However, it is troublesome to change the setting of the reception sensitivity of the microwave detector every time depending on the traveling region, the traveling route, etc., and there is a case where the user forgets to change and travels. Furthermore, if an incorrect selection is made, the microwave to be detected cannot be detected well.

  Furthermore, since it is dangerous to switch settings such as reception sensitivity while driving, switching of settings is performed in a paused state, but such a pause is not only cumbersome, but rather This may interfere with smooth vehicle travel, which may be undesirable.

  The present invention has been made in view of the above-described background, and the object of the present invention is to solve the above-described problems and automatically receive sensitivity, etc. based on the vehicle location, the traveling direction, and other traveling conditions. It is an object of the present invention to provide a microwave detector that can change the state setting of the vehicle, can output an alarm under conditions desired by the driver, and can contribute to safe driving.

In order to achieve the above-described object, in the microwave detector according to the present invention, a microwave detector main body that detects a microwave and outputs an alarm based on a predetermined operation setting condition, and obtains the current position of the vehicle. Position detection means, action setting control means for changing the action setting condition based on the current position obtained by the position detection means, a fixed area set with reference to a certain point, and action setting conditions in the area A region information storage unit that stores the information in association with each other, and the operation setting condition is to increase a microwave reception sensitivity in the region, and the operation setting control unit includes the region information storage unit based on the acquired current position. accesses, when located in the stored area, to increase the reception sensitivity in accordance with the reception sensitivity of the microwave associated with that region It was to be switched so.

  For example, when an operation setting condition in a certain region / position is registered, when it is detected that the position detection unit has moved to that location, the operation setting control unit automatically switches to the operation setting condition suitable for the position. Therefore, the driver does not need to perform the operation setting condition switching process one by one, and can concentrate on driving. In addition, since there is no forgetting to switch and the operation setting condition is suitable for the position, effective microwave detection and accompanying alarm output can be performed.

  In addition, a region information storage unit that associates and stores a certain region and operation setting conditions in the region is stored, and the operation setting control unit accesses and stores the region information storage unit based on the acquired current position. When the position is within the area, the operation setting condition associated with the area may be switched. This area may be provided by the user operating an operation button or the like provided on the microwave detector, or may be supplied via various recording media. Further, the input may be performed based on the current position, and if there is map data or the like, an area can be set based on the map data.

  In this way, for example, when moving to an area where many automatic speed measuring devices are installed, moving to the suburbs, or traveling on an unknown (not very detailed) land, the reception sensitivity is increased and reliable. Can detect and alert to the presence of microwave sources.

  Furthermore, it is preferable to provide an area storage means for storing a certain area, and to access the area storage means based on the acquired current position and to output an alarm when the area is located within the stored area.

  Still further, it is preferable that a means for calculating a vehicle speed from an output of the position detecting means is provided, and the operation setting control means has a function of switching an operation setting condition in accordance with the calculated vehicle speed.

  For example, when the vehicle speed is high, the alarm speed is suppressed and the vehicle speed is calculated based on the output of the position detection means, so that the vehicle speed can be calculated with high accuracy (the time required to move between two points, per unit time In addition, there is a merit that the installation and maintenance of a sensor for speed calculation and the maintenance are not required separately.

  As described above, in the microwave detector according to the present invention, the driving state is automatically switched to the operation setting condition set for the driving state based on the vehicle position information. It is preferable because it can concentrate on.

  Hereinafter, a first embodiment of a microwave detector according to the present invention will be described. The present invention is an apparatus that is mounted on a vehicle and used to detect and alert a microwave in a predetermined frequency band emitted from a speed measuring device for measuring the speed of the vehicle.

  FIG. 1 is a block circuit diagram showing a configuration of a main part of the microwave detector 1. As shown in the figure, the microwave detector 1 detects a microwave in a predetermined frequency band based on the set operation setting conditions, outputs a warning, and a GPS detector 2 that acquires GPS information. Based on the output of the receiving unit 3 and the GPS receiving unit 3, the operation setting control unit that determines the operation setting condition of the microwave detector body 2 and gives an effective command of the determined operation setting to the microwave detector body 2 5 and an instruction input unit 6 for notifying the operation setting control unit 5 of a setting command, operation setting conditions, and the like.

  The microwave detector main body 2 gives a reception signal based on the microwave captured through the horn antenna 2a to the microwave reception unit 2b, detects a microwave having a desired frequency, and outputs a detection signal. This detection signal is given to the reception determination unit 2c to determine whether or not the target microwave has been received. Further, the microwave receiving unit 2b is provided with an S meter output terminal, and the received signal strength output from the output terminal is given to the received strength determining unit 2d, where threshold processing is performed, and whether the received strength is above a certain level. It is determined whether or not.

  Then, the determination results of the reception determination unit 2c and the reception intensity determination unit 2d are given to the determination unit 2e, where it is determined whether or not a true microwave to be detected has been received. This determination is performed by, for example, AND processing, that is, when a microwave having a predetermined frequency is received by the reception determination unit 2c and a signal having a reception intensity equal to or higher than a certain reference is received by the reception intensity determination unit 2d. Judgment can be made. Needless to say, the determination method is not limited to this, and various methods can be used. Then, the functions of the reception determination unit 2c and the reception strength determination unit 2d may be appropriately changed according to the determination method.

  Further, when it is determined that the true microwave is detected by the determination unit 2e, a detection signal is given to the alarm device 2f, and a predetermined alarm is output. This alarm may be a buzzer or sound, or may be various types such as a lamp such as a light LED or a display.

  Note that the microwave receiver 2b uses, for example, a superheterodyne method in which the received signal and the output of the local oscillator are frequency-mixed by a mixer, the obtained intermediate frequency signal is input to a detector, and a signal of a predetermined frequency is detected. realizable. Moreover, since each processing part which comprises the microwave detector main body 2 is the same as that of the general structure used in the conventional microwave detector, the detailed description is abbreviate | omitted.

  The GPS receiver 3 receives a GPS signal emitted from the earth position measurement satellite, measures the current position of the vehicle, and obtains the traveling speed and the traveling direction based on the measured position. Specifically, GPS signals emitted from a plurality of satellites are received by the receiving antenna 3a and the GPS receiver 3b, and the reception is given to the position information calculation unit 3c, where the current position is based on the received information. (Longitude, latitude information) is calculated.

  The calculated current position information is given to the operation setting control unit 5, the vehicle speed determination unit 3d, and the traveling direction determination unit 3e. For example, the vehicle speed determination unit 3d can obtain the travel distance per unit time from the position information at a certain time and the position information after the unit time has elapsed, and can calculate the vehicle speed therefrom. Similarly, the traveling direction determination unit 3e can obtain the movement direction by obtaining the movement vector from the position information at a certain time and the position information after a certain time.

  As described above, when determining the vehicle speed and the moving direction, for example, two memories are prepared, one of which stores position information at the measurement time point, and the other is a certain time after the measurement time point (for example, after 2 seconds). ) Is stored, the vehicle speed and the traveling direction of the vehicle can be determined from the two pieces of position information.

  Moreover, although it is said determination, the determination of a vehicle speed and a advancing direction is performed at a fixed sampling interval. Furthermore, the traveling direction is performed when a setting command given from the instruction input unit 6 is given.

  The determination of the traveling direction does not use the position information obtained by the position information calculation unit 3c as described above. For example, a gyroscope or a compass is used, or an acceleration sensor (a sensor that can obtain a plurality of directions, When the detection direction is one direction, it can be obtained by a plurality of sensors.

  The operation setting control unit 5 sets the operation setting conditions of the microwave detector main body 2. The operation setting control unit 5 sets the operation setting conditions given from the instruction input unit 6 as they are, the position information calculation unit 3 c and the progress. It has a function of automatically switching operation setting conditions based on the output of the direction determination unit 3e.

  Briefly explaining this function, when a setting command is given from the instruction input unit 6, the position information and the moving direction at that time are acquired and stored in the memory. After that, the position information and the traveling direction sent from the GPS receiver 3 are acquired, and whether there is a match with the acquired position information and the traveling direction is searched. The associated setting conditions are read out and set in the microwave detector main body 2. Specifically, it is as follows.

  As shown in FIG. 2, first, the instruction input unit 6 includes a setting command input switch 6 a provided on the surface of the microwave detector 1 and a condition input switch 6 b for inputting setting conditions for setting operation. ing.

  The condition input switch 6b is for manually setting the operation setting conditions of the microwave detector main body 2, and has reception sensitivity, alarm type (buzzer, sound, LED only, etc.), and volume. Each condition may be input from a separate switch. Sensitivity, volume, etc. may be selected from a plurality of preset levels by a select button or the like, or may be changed steplessly.

  Then, the setting condition input via the condition input switch 6 b is transferred to the writing unit 7 a of the processing unit 7 of the operation setting control unit 5, and the writing unit 7 a sets the setting condition storage unit 8 a in the memory 8. To store. The setting condition storage unit 8a stores the current operation setting conditions. When the setting input storage unit 8a is basically updated by operating the condition input switch 6b, the reading unit 7b updates the setting condition storage unit 8a. While reading the contents, the read contents are transferred to the setting command unit 7c, and the setting command unit 7c sends an operation setting condition switching command to the microwave receiver body 2.

  In response to this command, the microwave detector body 2 increases / decreases the reception sensitivity and adjusts the alarm type and volume. This is the process for changing the operation setting condition accompanying manual input. Note that the switching operation on the microwave detector main body 2 side is the same as the conventional one, and the detailed description thereof is omitted.

  Further, when the setting command input switch 6a of the instruction input unit 6 is pressed, the control unit 9 of the operation setting control unit 5 recognizes the pressing and the control unit 9 indicates that the switch has been pressed. That is, it notifies the processing unit 7 that a setting command has been issued. Then, the processing unit 7 (setting command unit 7c) acquires the current position setting information and traveling direction information from the GPS receiving unit 3, reads the current operation setting conditions stored in the setting condition storage unit 8a, and 3 Two pieces of information are associated and stored in the setting state storage unit 8b in the memory 8.

  Further, the processing unit 7 (setting command unit 7c) acquires the position information, the traveling direction information, and the vehicle speed information output from the GPS receiving unit 3 at predetermined sampling intervals, and performs the following processing. That is, based on the vehicle speed information, if the vehicle speed becomes faster than a certain speed (for example, a speed that can be expected to travel on a highway such as 80 km), the reception sensitivity is increased. On the other hand, in the case of a constant speed different from the above (for example, a speed that can be predicted to be traveling in a city or traffic such as 40 km or 30 km), the sensitivity is lowered or the alarm is not output. The operation setting conditions such as lighting of only the LED are switched.

  Also, based on the position information and the moving direction information, the setting state storage unit 8b is accessed, and “(1) whether there is a setting state in which the two pieces of information match” and “(2) the position information is identical. It is determined whether or not there is a setting state in which the movement direction information is in the reverse direction.

  If the condition (1) is met, the setting condition stored in the setting state storage unit 8b that matches the condition is read and the operation setting condition of the microwave receiver main body 2 is set to operate under the setting condition. Switch.

  If the condition (2) is met, the operation setting condition before switching is restored. That is, the operation setting condition stored in the setting condition storage unit 8a is read, and the operation setting condition of the microwave receiver body 2 is switched to the read operation setting condition. Note that the processing based on the condition (2) may not be provided. Further, the condition (2) may not be “the moving direction is opposite”, but (2) ′ “the moving direction is different”.

  Next, an actual application example will be described. FIG. 3 shows a route from when the vehicle equipped with the present embodiment enters the highway b from the general road a to the highway b from the general road c.

  Since the highway b travels at a higher speed than the general roads a and c, the travel distance per unit time is long, and it is desired to detect the presence of the automatic speed measurement device from a position as far as possible. In general, since highways are isolated from other roads and the like, there is a low possibility that microwaves that are mistakenly recognized as microwaves emitted by an automatic speed measurement device, such as traveling in urban areas, are flying. Therefore, the receiving sensitivity during traveling on the highway b is higher than traveling on the general roads a and c. Therefore, the detection sensitivity of the microwave detector main body 2 is set high at the point A entering the highway b or a point before that. In this case, in the conventional case, the condition input switch 6b is operated and switched every time, but in the present invention, automatic switching is possible by the following procedure.

  First, the condition input switch 6b is operated at an appropriate position from the general road a to the expressway b, and setting conditions suitable for traveling on the expressway b are input and set. Thus, the setting condition storage unit 8a stores setting conditions suitable for traveling on the highway, and the operation setting of the microwave detector main body 2 is set to the conditions.

  Next, at the point A that entered the highway b, the setting command input switch 6a is pressed. Then, the position information (for example, specified by “latitude and longitude”) of the point A, the moving direction (for example, “east”) at the point A, and the setting condition stored in the setting condition storage unit 8a are associated with each other and set. It is stored in the storage unit 8b.

  Therefore, after that, when entering the highway b from the general road a, when passing through the point A, it is detected that “the position is A and the moving direction is east”, so that it is stored in the setting state storage unit 8b. The operation setting conditions suitable for the highway are read and set automatically.

  The same applies to the case of getting off from the highway b to the general road c at the point B. That is, in the case of a general road, the normal reception sensitivity is lowered, the alarm is changed, and the volume is changed. Therefore, at the point before reaching point B, the condition input switch 6b is operated to register setting conditions suitable for the general road c, and the setting command input switch 6a is pressed at point B. As a result, thereafter, when moving from the highway B to the general road c, the operation setting condition automatically becomes suitable for the general road c.

  In addition, once the setting command is set at the point A and the point B as described above, when subsequently moving in the same direction (same route), the operation setting condition suitable for the moving destination may be automatically switched. The driver can concentrate on driving and can contribute to safe driving.

  Furthermore, when the function of the condition (2) described above or the condition (2) ′ which is a modified example thereof is provided, even in the case of a reverse route to the set (no operation from the instruction input unit 6). Operation setting conditions can be switched automatically.

  That is, in the condition (2) ′, when the position is the same and the directions are different, the operation setting condition before switching is restored. Therefore, for example, when setting the operation setting conditions while traveling on the expressway b manually and moving to the general road c via the point B, the operation setting conditions for the general road c are automatically set when passing the point B. Suppose you switch to.

  After that, when traveling on the reverse route and entering the expressway b from the general road c, if it passes through the point B, the position matches and the direction of movement (west) is different (not northeast). The content stored in the setting condition storage unit 8a, that is, the operation setting condition for the highway is automatically switched. Thus, by registering one route, the reverse route can be automatically switched.

  In addition, if the condition (2) is set, the traveling direction is not reverse, so that automatic switching cannot be performed. In this case, for example, by setting the positions of points A and B before joining the expressway, Yes.

  Further, in the above-described method, for example, when the automatic switching is performed at the two positions A and B as shown in FIG. 3, the setting condition storage unit 8a stores the operation setting condition for the general road a. May be stored (when both are automatically switched at points A and B), and in that case, if the vehicle enters the general road c and the highway b through the reverse route and reaches the point B, it is essentially a high speed. Where the operation setting conditions for the road b have to be set, there is a possibility that the one for the general road a is set.

  Therefore, the data structure of the setting state storage unit 8b is stored in association with “setting conditions before switching” in addition to “setting conditions”, “position information”, and “traveling direction information” as shown in FIG. If it is determined that the direction is the reverse direction or a different direction, the “setting conditions before switching” may be read, and the operation setting conditions of the microwave detector main body 2 may be switched based on the readout. This “setting condition before switching” is the operation set in the microwave receiver main body 2 before the switching when the position information and the moving direction coincide and the setting condition is automatically switched. This can be realized by storing the setting conditions in the storage area.

  FIG. 5 shows a second embodiment of the microwave detector according to the present invention. In the present embodiment, a certain area is set, and the operation setting condition is switched when the vehicle is located inside or outside the area.

  Specifically, as shown in FIG. 5, the microwave detector 1 includes a memory 8 and a map information storage unit 8 c. In the present invention, the map information only needs to be able to identify the target landmark and other landmarks / reference house / position, and it is preferable to prepare the map information from the viewpoint of memory capacity. The map information may be stored in advance in the product, or a function for detachably attaching various recording media is added, and the map information is stored in the recording media, and the latest information can be obtained by attaching it. It is preferable to make the information available.

  The instruction input unit 6 includes a condition input switch 6b and a region information input switch 6c. The condition input switch 6b is for inputting an operation setting condition as in the first embodiment.

  The area information input switch 6c designates an area to be set as an operation setting condition. For example, the area information input switch 6c uses the above-described map information and designates a specific house (for example, a home) by a telephone number or an address in the map information ( Point information), and a region with radius rm (range information) based on the point information, or a region (range information) up to how many kilometers in the east, west, south, and north directions based on the point information.

  This designation image is as shown in FIG. When there is no map information, the range is set based on the current vehicle position. In addition, the setting of this area includes both the case where the above-described designated range is set as the target area and the case where the outside of the specified range is set as the target area.

  Further, the condition input switch 6b is operated to input the setting condition in the set area. Then, the processing unit 7 associates the received area (range information) with the setting condition at that time and registers it in the setting state storage unit 8b.

  For example, when there is no map information, the area information input switch 6c can perform point information by acquiring position information when a certain button is pressed, and range information can be obtained by setting a reference distance. If the distance is increased by the number of times the operation button is pressed, it can be handled without providing a monitor or the like, and can be made compact. In the case of map information, a numeric keypad may be used for identification by telephone number (the house where the telephone number is drawn is used as a reference point).

  Further, when a monitor is provided and the map information is output and displayed on the monitor, for example, the touch panel is provided on the monitor and the range information can be designated by touching the monitor screen. This specification method can be used for specifying a reference point and setting a region based on the reference point or for suddenly specifying only a range.

  Thus, during actual traveling, the processing unit 7 acquires the vehicle speed information and the position information output from the GPS receiving unit 3 at a constant sampling interval, and is similar to the first embodiment based on the speed information. And based on the position information, it is determined whether or not the current position is within the area specified by the range information stored in the setting state storage unit 8b. Read the condition and switch to it.

  In this way, for example, in the vicinity of your home, you know what is in what location, so the reception sensitivity may be low, but in places you do not know or in the suburbs, you want to increase the reception sensitivity, etc. If there is, the setting of the operation setting condition can be automatically changed by setting the reference point as home, designating the suburban area, and increasing the reception sensitivity. Furthermore, depending on how to input the setting conditions and position information, the location where the false alarm is generated is specified in advance as the position (area, range) information, and the setting condition is “no alarm output” or “not determined (reception sensitivity is not set). By setting it to “0”, etc., it is possible to prevent false alarms.

  In the present invention, since the normal operation setting condition set via the condition input switch 6b is stored in the setting condition storage unit 8a, any current position stored in the setting state storage unit 8b is stored. If the area does not fall within the range information area, the operation setting conditions stored in the setting condition storage unit 8a may be restored. Since other configurations and operational effects are the same as those of the first embodiment described above, the same reference numerals are assigned to corresponding members, and detailed descriptions thereof are omitted.

  FIG. 7 shows a third embodiment. This embodiment is based on the second embodiment, and an alarm function based on position information is added. That is, the position information storage unit 8d stores and holds the position or area where the object to be alarmed is present (all are "position information" in the present embodiment).

  When the vehicle reaches the position (in the region) stored in the position information storage unit 8d during traveling, the alarm drive command unit 7d detects this, regardless of whether or not the microwave is detected. The device 10 is operated to output a predetermined alarm.

  Of course, the alarm device 10 may also be used as the alarm device 2f in the microwave detector main body 2. Further, this position information may be stored in advance in the same manner as the above-described map information, and it is possible to exchange recording media (including ROM and RAM) and to switch to the latest data sequentially. good.

  In addition, since the other structure and the effect are the same as that of 2nd Embodiment mentioned above, the same code | symbol is attached | subjected to a corresponding member and the detailed description is abbreviate | omitted. Further, it is needless to say that the main part of this embodiment can be applied to the first embodiment.

  FIG. 8 shows a fourth embodiment. This embodiment is based on the first embodiment and incorporates a cancel function that does not output an alarm at a specific position. Specifically, the instruction input unit 6 is provided with a cancel switch 6d, and the processing unit 7 acquires the position information when the cancel switch 6d is pressed from the position information calculation unit 3c, and the cancel position information storage unit 8e. To store. At this time, the acquired position information may be stored as it is, or a predetermined range may be set around the position information.

  Thereafter, when the current position information sent from the position information calculation unit 3c matches the cancel position information, an alarm is not output regardless of whether or not microwaves are received. In this way, once the microwave detector body 2 receives the microwave and outputs an alarm, and if it is recognized as a word alarm, when the cancel switch 6d is pressed at that time, it passes through the same place thereafter. Even so, the alarm can be prevented.

  Of course, this cancel function is not based on the first embodiment, but may be combined with other embodiments, or may be realized by a single cancel function. In addition, since another structure and an effect are the same as that of each above-mentioned embodiment, the same code | symbol is attached | subjected to a corresponding member and the detailed description is abbreviate | omitted.

  In each of the above embodiments, the operation setting condition switching process based on the speed information is performed, but such a function is not necessarily required.

1 is a block circuit diagram showing a first embodiment of a microwave detector according to the present invention. It is an internal structure figure which shows the principal part. It is a figure for demonstrating the usage example of 1st Embodiment of the microwave detector which concerns on this invention. It is a figure which shows a modification. It is an internal structure figure which shows the principal part of 2nd Embodiment of the microwave detector which concerns on this invention. It is a figure for demonstrating the usage example of 2nd Embodiment of the microwave detector which concerns on this invention. It is an internal structure figure which shows the principal part of 3rd Embodiment of the microwave detector which concerns on this invention. It is an internal structure figure which shows the principal part of 4th Embodiment of the microwave detector which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Microwave detector 2 Microwave detector main body 2a Horn antenna 2b Microwave receiving part 2c Reception determination part 2d Reception intensity determination part 2e Determination part 2f Alarm 3 GPS reception part 3a Reception antenna 3b GPS receiver 3c Position information calculation part 3d Vehicle speed determination unit 3e Traveling direction determination unit 5 Operation setting control unit 6 Instruction input unit 6a Setting command switch 6b Condition input switch 6c Area information input switch 6d Cassel switch 7 Processing unit 7a Writing unit 7b Reading unit 7c Setting command unit 7d Alarm Drive command unit 8 Memory 8a Setting condition storage unit 8b Setting state storage unit 8c Map information storage unit 8d Position information storage unit 9 Control unit 10 Alarm

Claims (3)

A microwave detector main body that detects a microwave and outputs an alarm based on predetermined operation setting conditions;
Position detecting means for determining the current position of the vehicle;
Operation setting control means for changing the operation setting condition based on the current position obtained by the position detection means;
A region information storage means for storing a fixed region set with reference to a certain point and an operation setting condition in the region in association with each other,
The operation setting condition is to increase the microwave reception sensitivity in the region,
The operation setting control means accesses the area information storage means based on the acquired current position. When the operation setting control means is located in the stored area, the operation setting control means matches the reception sensitivity of the microwave associated with the area. A microwave detector that is switched to increase reception sensitivity . An area storage means for storing a certain area;
The microwave detector according to claim 1, further comprising a function of outputting an alarm when accessing the area storage unit based on the acquired current position and being located within the stored area. Means for calculating the vehicle speed from the output of the position detection means;
The microwave detector according to claim 1 or 2, wherein the operation setting control means has a function of switching operation setting conditions according to the calculated vehicle speed.

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