JPH0727020B2 - Radar device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is directed to an accident in a ship by receiving and processing information on an underwater accident from a marine accident reporting device carried by a passenger of a ship or an aircraft by a radar. The present invention relates to a radar device having a function of reporting the occurrence.

[Conventional technology]

In recent years, targeting 9 GHz band radar mounted on ships and aircraft, search and rescue radar transponders (hereinafter abbreviated as transponders) equipped on ships and lifeboats and life rafts mounted on ships have been put into practical use. In Japan, the floating transponder as a practical application test station has already been licensed in Japan, and some fishing boats are equipped with it. This utility is based on IMO (International M
aritime Organization ... International Maritime Organization), and IMO COM31 / WP.1, Annex 5 have already resolved the performance requirements for radar transponders for living boats.

This is due to CCIR's recommendation [AE / 8] [TECNICAL CHARACT
ERISTICS FOR SEACH AND RESCUE RADAR TRANSPONDERS)
In addition to the main items of, the requirements that must be met for operation are added.

Here, in order to help understanding of the present invention, a document describing the contents of the transponder of the above-mentioned practical use test station will be introduced, and an embodiment of this transponder system will be described.

The most recent one is “85/11, vo” of the monthly magazine “Shipbuilding Technology”.
The description is given in l.18no.11 P44 to P51.

Currently, P48-P51 is approved as a commercialization testing station.
However, the former one is also functionally equivalent and will be approved after some revisions.

Here, an example of this transponder which has already been put into practical use is displayed on the PPI of the target radar device in the system diagram of FIG. 6, the waveform diagram of each main part of FIG. 7, and the PPI of the target radar device. The displayed pattern will be illustrated and described.

In the following, the reference numerals shown in each of FIGS. 1 to 9 indicate the same or corresponding portions.

In FIG. 6, (1) is a horizontally polarized wave receiving antenna having omnidirectional characteristics in the horizontal plane, and the transmitting antenna (12) is also substantially the same. (2) is a microwave detector having a wide band characteristic, (3) is a video amplifier, and the radar radio wave (a) reaching this is detected and amplified to obtain a system trigger pulse (b). (4) is a NAND gate,
(5) is a monostable multivibrator that simultaneously generates a sneak-in prevention gate (d) and a transmission gate (c).

The gate width (G) of this transmission gate (c) is approximately 100μ.
s, the sneak-in prevention gate (d) has a waveform (d) in FIG.
The middle (L) is used as a threshold to obtain a long one by (dT).

The description of this operation is almost similar to that described in Japanese Utility Model Publication No. 55-37905, and therefore detailed description thereof will be omitted.

(6) is a combination of a self-propelled timer and a lamp driver, (7) is a lamp that also serves as a marker lamp, (8) is an electronic switch such as a transistor, (9) is a battery, a voltage stabilizing circuit and mercury. A power supply unit with a combination of switches, (10) is an electronically tuned microwave FM oscillator using a combination of GaAs-FET and variable capacitance diode, and (11) is synchronized with a transmission gate (c) by a sawtooth waveform (f). It is a sawtooth wave voltage generator for obtaining a high-speed frequency sweep radio wave (g).

In FIG. 7, (V) represents voltage, (T) represents time, and (F) represents frequency. In this transponder, (t) is approximately 5 μm.
s, (F.) is 9410 MHz, and (dF) is approximately 180 MHz.

Therefore, this transponder has a transmit / receive frequency of 9320.
Response waves can be returned to all radars existing between ~ 9500MHz.

FIG. 8 shows an example of the general echo and the PPI display situation of the response wave returned from this transponder.

The position of the radar antenna is the center of the screen, and point (X) is the relative distance at which this transponder is present. A linear blip train is displayed behind that distance, which is the response wave from this transponder. The azimuth width of the response wave is governed by the beam width (θ) of the radar antenna, that is, the azimuth resolution, and the blip interval (t) is approximately 5 μs (150 m / μs converted to the velocity of the radar radio wave, approximately 750).
m), the width (τe) of each blip is approximately expressed by the following equation, and this value is close to the pulse width (τ) of the radar wave of the waveform (a) in FIG. 7 or more than that. Larger should give better results.

(Τe) = (t) · B / (dF) ………… (1) Equation ∴B is the reception passband of the target radar, and the unit of (dF) is Hz, and the units of (τe) and (t) are Both are seconds.

Here, the point (X) depends on which frequency the radar transmits / receives, and the maximum distance error is about 5 μs (maximum about 75 μs).
However, since it means that the transponder is surely present in the direction of the blip row, the rescuer should proceed in the direction of the blip row.

When it approaches further, it responds not only to the main beam of the radar antenna but also to minor lobes such as side lobes and back lobes, so that an image close to a circular arc as shown in FIG. 9 is drawn.

Note that FIG. 9 shows a situation in which the observation radius is smaller than that in FIG. 8, and therefore (τe) and (t) are large.

The above transponder is always in the non-operating state because the power is cut off by the mercury switch of the power supply section (9).
In an emergency, it is dropped in the sea and floats, and the mercury switch automatically turns on the power.

If there is no irradiation of radar radio waves (a), (6)
The self-propelled timer and lamp driver combination part immediately started operating, and the indicator lamp of (7) blinks with the repetition of the time ratio of lighting for about 0.5 seconds and resting for about 4.5 seconds.

When the radar wave (a) is irradiated, a waveform of logic "1" corresponding to the time (G) of the waveform (c) of FIG. 7 generated according to the number of the radar wave (a) irradiated. However, by changing the blinking of the above-mentioned regular indicator lamp, which irregularly interrupts the combination of the self-propelled timer and the lamp driver of (6) above, the presence of radar radio waves, that is, a rescue ship, etc. Can inform the victim of the approach of

This pattern is similar to the arc-shaped radar PPI image in Fig. 9, and the lighting time becomes longer as the distance between them becomes smaller, and it automatically changes to a state of almost continuous lighting. It can help psychologically.

[Problems to be solved by the invention]

As described above, the conventional transponder system can report the fact of distress without modifying the existing radar device, and by using the symbol that is not confused with the symbol of the existing radio beacon device, and can approach the exact location. It is extremely useful, but it is thought that there are facts that contradict the context in various operational situations at sea. For example: (1) Is the transmission pulse emitted even if the radar antenna is rotated? That is, since the magnetron of the transmission signal source is expensive and its life is relatively short, the emission of the transmission pulse may be stopped when the radar image is not required.

(2) Do you constantly observe radar images even if the transmission pulse is emitted? Rather, it is mainly for maneuvering and watching, and it may be the normal situation to observe radar images from time to time.

it is conceivable that.

Even if the transponder waits for activation or emits a response radio wave, it cannot be rescued unless it is observed by the radar side.

At the present time, IMO is using FGMDSS, which utilizes recent sanitary communication technology, to improve the safety of human life at sea.
(Future Global Maritime Distress and Safety Syste
m; Future global salvage safety system) 1990
Work is in progress to introduce it from the year.

Compared to the current communication system using manually operated wireless telegraph, this system automates communication, makes it global, and introduces EPIRB (Emergency Position Indication Radio Marking) to search for marine accidents and improve the efficiency of rescue. This is an epoch-making system for safe navigation.

Actually, in this EPIRB, adoption of the transponder for the purpose of pinpoint rescue is considered in addition to the VHF or UHF band distress notification means.

However, it is difficult to apply the EPIRB device, which is currently considered, to accidents where an individual accidentally falls into the sea while operating on a ship and is lost.

The reason is that it is physically impossible for an individual to carry the device and configure it in a size that does not interfere with normal work.

Unfortunately, in spite of the fact that a large number of fishing accidents have occurred in the fishing industry and shipping industry, the precious human life has been lost without obtaining accurate reporting means and evidence.

It is said that a ship will normally move 10 times the length of the ship even if a stop command is given during navigation, and it will take a considerable amount of time to make a detour and turn to the expected sea level. Furthermore, if the discovery of a fall is delayed for a while, and if the search takes more time, the probability of rescue will be extremely low.

The present invention has been made to solve the above-mentioned drawbacks, and utilizes the basic part of the transponder system, and is provided with a means for automatically issuing a notification in case of an underwater fall in the same frequency band as the transponder. On the condition that the occupant is equipped with a wristwatch-shaped or near-inboard-sea fall notification device, the target ship's radar device will receive a function to notify the ship of the accident by receiving the sea-fall information. The purpose is to obtain a radar device that has.

[Means for solving problems]

The radar device according to the present invention is provided between the receiving part and the instructing part of the own-ship radar device that receives the transmission pulse train that is forcibly transmitted by the underwater fall reporting device for a certain short time after the underwater fall, that is, the receiving video. A means for branching the output to extract the transmission pulse train signal, a function for counting the pulse train within a predetermined time, and a loudspeaker capable of making a loud voice notification when a predetermined count value is obtained are added. It is something that is done.

[Action]

Since the undersea fall notification device first sends out a transmission pulse train signal, which was not provided in the conventional transponder system, the radar device is provided with a function circuit for receiving and identifying the transmitted pulse train signal, so that the undersea fall notification signal can be easily transmitted / received. This can facilitate rescue work for people who have fallen into the sea.

Example of Invention

Hereinafter, first, a system diagram of an embodiment of the radar device according to the present invention is shown in FIG. 1, a waveform diagram of each main part is shown in FIG. 2, and a system diagram of an embodiment of an underwater fall reporting device related to the present invention is shown. FIG. 3 is a waveform diagram for explaining the operation of the subordinate portion derived from the addition of the additional circuit, and FIG. 4 shows the mutual operation, and FIG. 5 particularly shows the miniaturization of the antenna system. The feasibility of the device will be described with reference to a perspective view showing an embodiment of a wristwatch-shaped underwater fall reporting device.

First, Fig. 1 shows "Fig. 1.2 Typical pulse radar system diagram" on page 5 of Radar Technology [No. 1] published by The Institute of Electronics and Communication Engineers of Japan (1st edition issued April 20, 1968). Quote,
A radar device incorporating means for branching the radar video signal from the point Y additionally shown in this figure and further branching the system trigger signal from the point Z will be described.

Although the operation surface of the radar device is omitted in this figure, in the actual radar device, mainly on the panel surface of the indicator, in addition to the main power switch, transmission switch, antenna rotation switch, observation distance changeover switch, etc. Equipped with various adjustment knobs.

In addition, the A scope is rarely used in marine radar.

In FIG. 1, (31) and (32) are respective input buffer circuits, which are intended to be converted into circuits having high input impedance so that the video signal of the radar device and the system trigger signal are not distorted. In particular, the input buffer circuit of (31) should be able to obtain good results with a voltage comparator in the video frequency band capable of waveform shaping while eliminating noise contained in the video signal, or with a Schmitt function gate IC, etc. .

(33) is a monostable Mathil vibrator for deriving a delay trigger, and obtains the waveform (h) in FIG. If this time (D) is selected near the time corresponding to the maximum detection distance of the radar indicator, it will not be confused with the reflected video signal even during radar transmission, and the pulse of the high-speed frequency sweep radio wave (g ') shown in FIG. Counting becomes easy.

Similarly, (34) is also a monostable multivibrator, which is activated from the rising time of the waveform (h) in FIG. 2 to create the gate (j) for pulse counting. This time (K) may be set by setting a time constant so that it is stopped before the next system trigger rises, or reset by this system trigger or pre-trigger (not shown).

(35) is a 2-input AND gate for deriving the waveform (m) in FIG. That is, a high-speed frequency sweeping radio wave (g '), which will be described later, is input as a video signal (Y) through the receiving section of the radar, and is taken out within a time (K) section.

(36) is a first pulse counter which counts the number of pulses during the time (K) and derives the waveform (n) of FIG. The division ratio in this case is the pulse interval (t) of the waveform (Y) of FIG.
Is about 5 μs, so it may be set in consideration of the above time (K).

The waveform (n) in FIG. 2 is the second AND gate (3
7), which is regulated by the output waveform (q) of the monostable multivibrator (38) and confirms with a hit number corresponding to or slightly smaller than the pulse hit number described later, that is, a second pulse counter ( The waveform (u) of the divided pulse is extracted in step 39).

This means does not judge the fact that a high-speed frequency sweep radio wave (g ') is emitted, which will be described later, based on the presence or absence of a series of pulse train signals / waveforms (m) or waveforms (n). Try to recognize this by getting a close count.

The reason for this is to avoid interference from various communication measuring instruments mounted on the ship, or to prevent malfunction due to reception of radar waves from other ships.

(40) is a driver for obtaining a contact signal of a relay or the like after the waveform (u) of FIG. 2 is derived, (41) is a relay,
Reference numeral (42) is an alarm sound generator, and reference numeral (43) is a loudspeaker for transmitting an alarm sound to the inside of the ship, and if the same kind of equipment is already installed in the ship, it may be connected from the alarm sound generator (42).

Also, if another contact signal (w) of the relay (41) is connected in parallel with the transmission switch of the radar, automatic transmission becomes possible.

As described above, it is possible to obtain the information on the underwater fall by branching and connecting the above-mentioned circuit of a relatively simple scale to the conventional radar device.

It should be noted that the illustration of the reset pulse and the latch pulse necessary for the counting process and the illustration of the power supply connection to each circuit are not shown in FIGS. did.

Next, an embodiment of the underwater fall reporting device will be described.

In FIG. 3, (1) is still a receiving antenna, but it is not limited to the above-mentioned omnidirectionality in the horizontal plane, and as shown in FIG. 5, it faces the slot provided on the conductor surface. The unidirectional one using the reflector of is used.
The transmitting antenna of (12) is exactly the same. (9) is a power supply unit in which a battery and a voltage stabilizing circuit are combined, but it is a good idea for miniaturization to change the above-mentioned mercury switch to a reed switch (proximity switch) for magnetic reaction operation. Further, as the battery, a lithium battery or a seawater battery is suitable because of its storability.

Various types of seawater batteries are already on the market, and most of them are used as power sources for marker lights for inflatable liferafts. A seawater battery is a primary battery, which is put into the sea at the time of use and uses seawater as an electrolytic solution, so it has excellent storage stability at all times and is easy to reduce in weight.
In this case, the switch is unnecessary.

(21) is a timer with a monostable multivibrator that opens the gate for about tens of seconds after power is applied. It starts from the ON time when power is applied as shown in waveform (H) in Fig. 4. , Maintain a logic "1" during time (S).

Reference numeral (22) is an isolator in which two diodes are combined to pass the waveform (c) of FIG. 7 or the waveform (H) of FIG.

Therefore, a gate signal of logic "1" is introduced from the timer (21) to the electronic switch (8) for about tens of seconds after the power is applied (when the seawater battery is put into the sea). An electronic tuning microwave FM oscillator (10) and a sawtooth voltage generator (1
1) is excited at the same time and the waveform (f ') in Fig. 4,
(G ') is derived.

This high-speed frequency sweep radio wave (g ') is not synchronized with the radar pulse, but the frequency sweep range is the same as in the transponder described above.

Also, the "integration of radar pulse" based on the number of pulse hits as described later cannot be obtained, and it is difficult to display it as a clear symbol on the radar indicator, but in the radar receiver, as in the case of the transponder described above. Should be received.

Here, a supplementary explanation will be added on the time setting of the timer.

The waveform (a) of FIG. 4 represents a pulse train radio wave that has a longer time axis than the waveform (a) of FIG. 7 and that radar radio waves are radiated from the beam width (θ) in the horizontal plane of the antenna and reach the radar train. Normally, the antenna receives signals every few seconds by continuously rotating and scanning the antenna in a horizontal plane by 360 degrees. on the other hand,
The pulse repetition frequency of the radar system is set in consideration of its maximum detection distance, and when trying to find a target with radar, usually many pulses are reflected from the target at each scanning of the antenna, and the detection ability is Has been improved. When the radar antenna scans, let n be the number of pulses (usually called the number of pulse hits) reflected from one point target in the beam. The process of adding all of these radar reflection pulses to improve the detection ability is called “integration of radar pulse”, which usually depends on the radar indicator and the eyes and brain of the observer. There is. Here, θ = antenna beam width at half power point (degrees) fr = pulse repetition frequency (Hz) ω = antenna rotation speed (rpm).

Most of the marine radars have horizontal planes of θ = 1 to 2 degrees and fr = 50
If 0 to 3000 Hz, ω = 10 to 30 rpm, and the lowest value of the radar antenna rotation speed is assumed to be 10 rpm, the value of "about several tens of seconds" is 6 seconds + radar antenna vertical in-plane directivity. Choose a time that takes into account the ship speed to reach the cover area. That is, it is only necessary to select the high-speed frequency sweeping radio wave (g ') to be received by the radar even if the timer (21) is activated under any circumstances.

For example, ship speed 10kt, captain 50m, radar antenna height 20m,
Assuming that the antenna has a vertical in-plane directivity of 20 degrees, the antenna enters the coverage area at a distance of about 160 m, which requires about 40 seconds. On the radar side, if this radio wave is received, as described above, it will detect this and issue an alarm sound to notify the inside of the ship of the fact that it has fallen into the sea, and if radar transmission is stopped, it will automatically transmit this at the same time. You can do it like this. Immediately after entering radar observation, at this time the undersea fall notification device has already automatically switched to the conventional transponder function.
You can get close to the fallen person.

Next, a perspective view of the embodiment shown in FIG. 5 will be described with respect to the possibility of making the above-mentioned underwater fall reporting device into a wristwatch form.

Since an ordinary person wears a watch on his left arm, the apparatus shown in FIG. 5 is shown with all the devices worn on the right arm side.

In FIG. 5, (1) and (12) are antennas having a Bat wing type conductor surface provided with a thin slot of about a half wavelength, and the slot length in this frequency band is about 16 mm.

Assuming that power is fed to this center, the impedance at the feeding point is about 400Ω including the imaginary part in free space,
If a reflector is provided and the slot length is adjusted slightly as shown below, it can be directly connected to a 50Ω microwave IC circuit (MIC).

Further, the directivity thereof can be transformed from the original eight-character shape to a single directivity, and it is possible to avoid the influence of the arm. (2), (3),
(10) is a circuit of the same type as described in Fig. 6 at the beginning, with a thickness of about
It is mounted on a strip line provided on an alumina base material of about 0.5 mm.

Since the back surface of this alumina base material is a thin conductor film, keep the distance from the slot antenna in (1) and (12) above.
It can be used as a reflector if it is separated by about 0.15 to 0.25 wavelength.

(51) is a radome made of thin hard resin, (52) is a case where a conductive film is plated on the back surface of the same hard resin, (53) is a shield plate for reducing interference between the slot antennas (1) and (12), ( 54) is the NAND gate (4), monostable multivibrator (5), electronic switch (8), sawtooth voltage generator (11), timer (21), isolator (22) and power supply voltage stabilization shown in FIG. It is a film substrate made of a polyimide resin in which integrated circuits and the like are integrated and attached, and can be attached after being slightly curved.

(55) is a base made of hard resin, and a belt for mounting arms (58)
Is included. (56) is the above-mentioned proximity switch for connecting / disconnecting the battery power supply. (56) is a magnet unit, and in the structure of this figure, slides back and forth to connect / disconnect the battery power supply.

(59) is a belt for the waterproof battery unit (60), which is integrally attached to the battery unit. The case of the battery unit (60) is slightly curved to fit under the arm of the body.

When the belt (59) is worn from the left shoulder (lower left of the neck) to the armpit of the right arm, the battery unit (60) fits under the armpit of the right arm, and the workability can be minimized. (62) is a two-core cable for the battery power source, and a two-pole connector (61) with a waterproof rubber plug is attached to the end on the battery side.

The size of an ordinary men's watch is about 36 mm in diameter.
mm, the length of the belt mounting part is about 40 mm, the thickness is around 10 mm, but the design size of the part corresponding to the “wrist watch” of this device is slightly larger than this, the approximate size is 35 mm × 45 mm, thickness 14 mm
It is a good prospect.

In addition, the battery unit (60) where size and weight are most concerned
Assuming that 3 AA type manganese dioxide / lithium batteries with an elemental voltage of 3V are used, the weight is about 70g excluding 48mm x 60mm, thickness 20mm, belt (59), and the water temperature is 0 ° C in the sea. Even if it falls, the notification can be transmitted for about 3 hours, and it is expected to have sufficient practicality.

Here, a supplementary explanation will be added on the correspondence between the directivity of the slot antennas (1) and (12) and the polarization plane of the target radar antenna.

As described above, the slot antennas (1) and (12) have a unidirectional pattern, but when a person who has fallen into the sea desperately starts swimming, both arms move in and out of the sea surface, and the directivity is inevitable. Is not determined. However, there are always times when the main directivity of the arm moves toward the radar antenna,
Since the speed is considerably slower than the transmission time of the information, it is not necessary to pay attention to the directivity and the plane of polarization.

However, it is unavoidable that the contact rate with the radar antenna will decrease, but it is not considered necessary to discuss the reduction of the reach distance due to the inclination of polarization and the deviation from the directivity at the shortest distance.

Rather, if the direction and distance of a person who has fallen into the sea can be found even once during the search, it becomes possible to approach the person quickly and accurately as in the case of the transponder.

Although the fixing tool between the elements is omitted in the embodiment shown in FIG. 5, it goes without saying that the fixing tool is provided if necessary.
Although not shown in the figure, it is desirable to provide a yellow or orange indicator lamp that emits light at the same time when the power is turned on for the final confirmation of the search side at night or in the thick fog (also for confirmation of a person who has fallen into the sea).

Although the above-mentioned embodiments have consistently described means for coping with a fall-in-the-sea accident, it goes without saying that if a similar means is adopted for a conventional transponder, it can be developed to be more effective.

〔The invention's effect〕

As described above, as a countermeasure against the underwater fall accident that has been a long-standing concern for a long time, the radar device according to the present invention can be quickly transmitted by a relatively small and small underwater fall notification device. If the ship's radar is prepared, it is certain that the rescue rate of people who fall into the sea will be dramatically improved.

The circuit group of the present invention can be incorporated in either the transceiver or the indicator, or can be installed as an additional unit, so that the introduction of this function is easy.

In addition, as a measure against similar accidents of aircraft, the present invention has a great significance in that an occupant who has escaped from the aircraft can report to a nearby ship and be rescued by the above means.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of the radar device according to the present invention, which is for receiving an underwater fall notification issued from the underwater fall notification device of FIG. 3 and prompting an alarm. FIG. 2 is a waveform diagram showing the operating condition of each part of FIG. 1, and FIG.
FIG. 4 is a systematic diagram of one embodiment of the above-mentioned underwater fall notification device related to the present invention, and FIG. 4 is a waveform diagram for explaining the operation of the main extraction unit of FIG. 3, which is shown in FIG. FIG. 7 is a diagram in which equivalent portions are deleted from the waveform chart of each part of FIG. 7 for explaining the operation of the system diagram of one embodiment of the conventional search / rescue radar transponder. FIG. 5 is a perspective view showing one embodiment for explaining that a wristwatch can be actually realized from the system diagram of one embodiment of the underwater fall reporting device shown in FIG. 3, and FIG. Fig. 7 is a system diagram showing a radar transponder for search and rescue that has been put to practical use from Fig. 7, Fig. 7 is a waveform diagram showing the operating condition of each part in Fig. 6, and Figs. 8 and 9 are radar's PP
I is a diagram showing an example of the image of the search / rescue radar / transponder shown above, and in particular, Fig. 9 is generated when the relative distance between the radar and the search / rescue radar / transponder becomes a close range. This is an example of an easy video. In FIG. 1, (31) and (32) are input buffer circuits,
(33) is a monostable multivibrator for deriving a delay trigger, (34) and (38) are also monostable multivibrators, (3)
5) and (37) are 2-input AND gates, (36) and (39) are pulse counters, (40) is a relay driver, (41) is a relay, (42) is an alarm sound generator and (43). ) Is a loudspeaker. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (4)

[Claims] 1. A radar device for receiving and processing a notification radio wave emitted from an underwater fall notification device carried by an occupant of a ship or an aircraft, and means for extracting a video signal output of the radar device and a system trigger output, respectively. ,
From the extraction timing of the system trigger, means for deriving a delay trigger delayed to a time corresponding to the maximum detection distance of the radar system, and the extraction timing of the next system trigger using this delay trigger or a time before this First gate means for gate-outputting the video signal output by a first gate signal holding logic up to, and first counting means for counting the number of pulses contained in the gate-output video signal, First above
Second gate means for gate-outputting the output value of the first counting means by the second gate signal which maintains the logic for a time longer than the period of the gate signal of Counting means, judging means for judging the count value output from the second counting means and its pulse continuity to extract a contact signal, and the contact signal for driving the acoustic signal source to transmit the sound. A radar device having a function of identifying and notifying the notification radio wave, which comprises a loudspeaker notification means. 2. The radar device according to claim 1, wherein the radar device is transmission-driven by a contact signal. 3. The radar device according to claim 1 or 2, wherein the identification and notification function is incorporated in the radar device. 4. The identification / notification function is added to an existing radar device.
The radar device according to the item.