JP3049810B2 - Signal compensator for signal detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal compensating device used for a signal detecting device such as a magnetic detecting device for detecting a position of a moving body.

[0002]

2. Description of the Related Art As a method of detecting a current position of a moving body while sailing on the sea or under the sea, a plurality of magnetic detectors (magnetic sensors) D _A , as shown in FIG.
D _B, ..., a D _E are disposed at predetermined intervals, each of the magnetic detectors D _A, ..., the data processing apparatus a detection signal D _E 1
And the data processing is performed to determine how much the magnetic change is output from each magnetic detector, and it is determined that the moving body has reached the position of the magnetic detector having the largest magnetic change. In addition,
Even magnetic detection device of this type, in order to compensate Toka geomagnetism, the output from other environmental conditions, a plurality of magnetic detector D _A, ..., one of D _E, such as a magnetic detector D _A
Was a compensating, D _B of other magnetic detector, ..., and with the compensation detector D _E.

[0003]

The above-described conventional magnetic detection apparatus uses a specific detector fixedly used for compensation, so that when a moving body approaches the compensation detector, the specific detector is used. The signal components are output to compensating detectors, which are applied as compensation signals to other detectors, which have specific inputs to those detectors even if no moving objects are approaching. There is a problem in that an output is output as if a signal was input, leading to erroneous detection.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a signal compensating device of a signal detecting device capable of correctly detecting a moving object even if it arrives at a compensating detector. It is an object.

[0005]

In the signal compensating apparatus according to the present invention, a plurality of detectors are arranged at a predetermined interval, and one of the detectors is used as a compensating detector, and the other detectors are used. In a signal detection device in which a signal is compensated by an output of the compensation detector, a signal difference calculation unit that calculates a difference in signal output between the compensation detector and each of the other detectors,
Each signal difference calculated by the signal difference calculation means, its
Other and first determining means for determining whether greater or not than the set corresponding to the first threshold value for each detector, first determine the
According to the determination by the different means , each signal difference corresponds to the corresponding first threshold.
If greater than the value , the difference , the corresponding first threshold and
Calculating a modified difference by the weight determined by the positional relationship between the detector according to the fine compensation detector and the signal difference, when the <br/> signal difference is equal to or less than the first threshold corresponding the discrimination a modified difference calculating means for the correction difference between 0, means for calculating the sum of the correction difference, sum of corrected difference is the compensation detector
A second to determine whether the value is greater than a set threshold value
And discriminating means, the discrimination of the second discriminating means, and the sum
If it is less than threshold, the difference for each detector output of the compensation detector as a compensation signal, every other detector
Means for performing signal detection based on whether or not the sum is greater than a corresponding second threshold value that has been set;
Means for switching the compensation detector to another detector when it is larger .

[0006] In this signal compensation device first, for example, and for compensating the detector D _A, the difference between the output of the detector and another signal detector for this compensation is calculated respectively, each difference
It is determined whether or not it is greater than a corresponding first threshold value set for each of the other detectors .
Corresponding to the first threshold value and the compensation detector and each signal difference.
The correction difference is calculated based on the weight determined by the positional relationship with the detector, and if the difference is equal to or smaller than the first threshold value , the correction difference is set to 0.
And, then, the total sum of these modifications difference, this sum is determined whether or not greater than the set threshold to the compensation detector, the sum is equal to or smaller than the threshold value, compensating Assuming that the moving object has not reached the position of the detector, the output of the other detector is compensated for by the output of the compensating detector, and the process for the presence or absence of signal detection at each detector is started. Sum is greater than threshold
If it is determined that the moving object has arrived at the position of the current compensation detector, the compensation is switched to another detector.

[0007]

The present invention will be described in more detail with reference to the following examples. FIG. 3 is a schematic diagram of a magnetic detector in which the present invention is implemented, and magnetic detectors D _A , D _B ,.
_DE are arranged at regular intervals, and these magnetic detection signals are taken into the data processing device 1.

[0008] First magnetic detector D _A, ..., of the D _E, the magnetic detector D _A is used for compensation, other magnetic detector D _B, ..., a magnetic detector for D _E signal detection Assigned to. The data processing apparatus 1, when the measurement start, the first magnetic detector D _A it may be used as it is for the compensation, or other detector, do processing switch for compensation, and thereafter, by each magnetic detector Move on to signal detection operation.

The processing operation will be described below with reference to the flow charts shown in FIGS. The output signal A of the magnetic detector D _A first calculates a difference S _B of the output signal B of the magnetic detector D _B [(hereinafter abbreviated as ST) Step ST 1], the difference S
_It is determined whether or not _{B is} larger than a threshold value TH2B (S
T2). If the one of the magnetic detector D _A, is also mobile in D _B not arrived, it may look substantially the output is the same, when the moving body has arrived to one of the detectors believed the difference signal is greater than this threshold TH2 _B, therefore, if the determination of ST2 is YES, W threshold TH2 _B of subtracting from the difference S _B
B is multiplied by a weight to calculate a modified difference HS _B (ST
3). In the case of ST2 in decision NO, is that is the difference S _B
If it is less than the threshold value TH2 _B, the correction difference is that there is no need to consider, which was a 0 (ST4), the magnetic detector D _A, ending the modification difference derivation between D _B.

[0010] Next, obtains the difference signal S _C between the magnetic detector D _A and the magnetic detector D _C for the compensation (ST5), as with the above case, by comparing the threshold TH2 _C and the difference S _C (ST
6), when the difference S _C is large, multiplied by the weight W _C a difference of the difference S _C and TH2 _C, obtaining a corrected difference HS _C (ST
7). If NO in the determination of ST6, that is, the difference S _C is
If the difference is equal to or smaller than the threshold value TH2 _C , the correction difference HS _C is also set to 0 (ST8), and the correction difference calculation processing in the magnetic detectors D _A and D _C ends. Similarly magnetic detector for compensation D _A and other magnetic detectors _D D, also obtains a modified difference HS _D, HS _E for D _E, seek the sum of these HS _A (ST9). Incidentally, the weight of the detector in the are and _{W B> W C> W D} > W E, by object approaches to these compensator detector, close to the compensation detector test
Since the output device is more affected, such weighting is performed in the order of closerness .

When the sum HS _A is obtained, the sum HS _A is then calculated.
_A it is determined whether greater than the threshold value TH _A compensation detector (ST10), into play <br/> if the total sum HS _A is equal to or less than TH _A is near the magnetic detector D _A as the moving body is determined not to have arrived, thereafter was originally planned, the detector D _a
Is used as a compensation detector, and it is determined whether or not the difference S _B of the other detectors is larger than a threshold value TH _B (ST1).
1) Similarly, each of the other magnetic detectors D _C ,..., D _E also detects the presence or absence of a signal (ST12), and ends the operation. In ST10, the sum HS _A is equal to the threshold value TH.
Is greater than _A, it is assumed that the moving body has arrived in the vicinity of the magnetic detector D _A for the current compensation, to use the magnetic detector D _A for detection, other compensation detector Switch to
E (ST13), then returns to ST1 in that state, will continue the same process.

Although the above embodiment has been described with reference to the case where a magnetic detector is used as a detector (sensor), the present invention is also applicable to signal compensation when another signal detector is used. can do.

[0013]

According to the present invention, the difference between the output of the compensating magnetic detector and the output of each of the other magnetic detectors is obtained, and this difference and the corresponding first set for each of the other magnetic detectors are determined.
Determination correction difference heavier mini corresponding to the position of the other magnetic detector relative threshold and a compensation detector, and obtains the sum of the corrected difference, the sum of sets to compensate for magnetic detector
To determine if the sum is greater than
If larger than have value, and the object to the compensation detector is approaching, switches the compensation detector to other magnetic detector, if the sum is less than the threshold value, the compensation detector of and that there is no influence on other, since continued as detection processing, even when the moving body compensation detector approaches can reduce the relative influence on the other detector, more accurate signal Detection can be performed.

[Brief description of the drawings]

FIG. 1 is a first half of a flowchart for explaining the operation of a magnetic detection device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a latter half of the flowchart.

FIG. 3 is a diagram showing an outline of a magnetic detection system in which the present invention is implemented.

[Explanation of symbols]

_{D A · D B · D C} · D D · D E magnetic detector 1 data processing device

Claims (1)

(57) [Claims] 1. A plurality of detectors are arranged at predetermined intervals, one of said detectors serving as a compensation detector, and the other detector is signal-compensated by the output of said compensation detector. in the signal detection device, the signal difference calculation means for calculating a difference between the signal output of the compensation detector and each of the other detectors, the signal difference calculated by the signal difference calculation means, its
A first discriminating means for discriminating whether or not greater than a first threshold corresponding set for each other detector, the discrimination of the first discriminating means, the respective signal difference corresponding 1
Of if it is larger than the threshold value, the difference, corresponding to the first Works
A correction difference is calculated based on a threshold value and a weight determined by a positional relationship between the compensation detector and the detector relating to the signal difference, and each signal difference is equal to or less than a corresponding first threshold value by determination. A correction difference calculating means for setting the correction difference to 0; a means for calculating a total of the correction differences; and a sum of the correction differences based on a threshold value set in the compensation detector.
And a second determining means for determining whether the sum is greater than the threshold value.
In this case, the output of the compensating detector is used as a compensation signal, and the difference of each detector is set to a corresponding value set for each of the other detectors.
Second means for performing a large whether the signal detection than the threshold value, if the sum is greater than the threshold value, the compensation detector As a
Means for switching to another detector .