JPH04355389A - Fault diagnostic circuit - Google Patents

Abstract

PURPOSE:To obtain a fault diagnostic circuit which can diagnose the fault in every channel of a multibeam-antenna receiver. CONSTITUTION:The amplitude values of the signals which are received with a plurality of antennas 1a-1n and converted with converters 2a-2n are compared with the ideal amplitude value which is generated with an amplitude-value generating circuit 5 based on the maximum amplitude value obtained with a maximum-amplitude-value operating circuit 4 in a comparing circuit 6. The amplitude differences obtained in this comparison are averaged in an average- value operating circuit 7. The angle for the amplitude difference is obtained with an angle operating circuit 8. The histogram which outputs the angle where the maximum times are obtained is operated in a histogram generating circuit 9. The fault is judged with a judging circuit 10 based on the angle of each antenna channel and the angle where the maximum number of times are obtained.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fault diagnosis circuit, and more particularly to a fault diagnosis circuit for a multi-beam antenna receiver.

0002

2. Description of the Related Art Conventionally, as shown in FIG. 3, a plurality of antennas 1a, 1b, .
When installing a fault diagnosis circuit in a multi-beam antenna receiver consisting of a receiver 3 and a receiver 3, each antenna 1a,
Test signal generators 11 for inputting test signals are provided between the converters 2a, 2b, . . . , 1n and the converters 2a, 2b, . The test is performed by receiving a test signal generated from the test signal generator 11 with the receiver 3.

0003

[Problems to be Solved by the Invention] In such a conventional fault diagnosis circuit, the test signal generated from one test signal generator 11 is inputted to the downstream stage of each antenna. ..., 1n fails, there is a problem in that it cannot be detected. An object of the present invention is to provide a fault diagnosis circuit capable of detecting a fault in an antenna.

0004

[Means for Solving the Problems] The fault diagnosis circuit of the present invention detects the maximum amplitude based on the output from the converter provided in each of a plurality of antennas, and the channel (CH) number corresponding to the antenna. A maximum amplitude value calculation circuit that outputs the maximum amplitude value, an amplitude value generation circuit that generates an ideal amplitude value for each CH from the CH number of the maximum amplitude, and a comparison circuit that compares the amplitude value of each CH from the converter with the ideal amplitude value. A comparison circuit that outputs the amplitude difference, an average value calculation circuit that calculates the average value of the amplitude difference from the amplitude difference of each CH, and an average value of the amplitude difference, the CH number of the maximum amplitude, and the amplitude difference of each CH are input. An angle calculation circuit that calculates the angle of the amplitude difference, a histogram generation circuit that calculates a histogram by inputting the angle of each CH, and outputs the angle that results in the maximum number of times, and an error detection circuit that calculates the angle of each CH and the angle that results in the maximum number of times. and a determination circuit for determining.

[0005]

[Operation] According to the present invention, the amplitude value of the signal received by each antenna is compared with the ideal amplitude value based on the CH that is the maximum amplitude value, and the amplitude difference is obtained. Utilizing the fact that the amplitude differences of each CH have a predetermined relationship, failures in the CHs are diagnosed based on the deviation of the amplitude differences.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings. FIG. 1 is a block circuit diagram of an embodiment of the failure diagnosis circuit of the present invention. In the figure, a plurality of antennas 1a, 1
b,..., 1n, converters 2a, 2b,..., 2n that convert the signals output by the antennas into digital signals, and a receiver 3 that performs a receiving operation by performing calculations on the converted signals.
This constitutes a multi-beam antenna receiver. A maximum amplitude value calculation circuit 4 and a comparison circuit 6 are connected to the rear stage of each of the converters 2a, 2b, . . . , 2n. This maximum amplitude value calculation circuit 4 detects the maximum amplitude of the converted digital signal and calculates its antenna number, that is, the channel (CH).
You can output the number. Connected to this maximum amplitude value calculation circuit 4 is an amplitude value generation circuit 5 that generates an ideal amplitude value for each CH from the maximum amplitude CH number.

[0007] Also, the comparison circuit 6 receives each CH from the converter.
An amplitude difference can be output by comparing the amplitude value of the amplitude value with the ideal amplitude value from the amplitude value generation circuit 5, and an average value calculation circuit 7 which calculates the average value of the amplitude difference from the amplitude difference of each CH, and an amplitude difference An angle calculation circuit 8 calculates the angle of the amplitude difference by inputting the average value, the CH number of the maximum amplitude, and the amplitude difference of each CH, and calculates the angle of the maximum number of times by inputting the angle of each CH. a histogram generation circuit 9 that outputs
A determination circuit 10 is connected that determines an error based on the angle of each CH and the angle that is the maximum number of times.

According to this configuration, the antennas 1a, 1b, . . .
, 1n are transmitted to converters 2a, 2b,..., 2
It is converted into a digital amplitude value at step n, and is input to the maximum amplitude value calculation circuit 4 and the comparison circuit 6. Maximum amplitude value calculation circuit 4
detects the maximum amplitude of the input digital amplitude value and outputs the CH number having the maximum amplitude to the amplitude value generation circuit 5. The amplitude value generation circuit 5 calculates the ideal amplitude value PAn received by each antenna and the antenna direction M of the maximum amplitude from the CH number having the maximum amplitude, with the antenna beam nose of the maximum amplitude as the true azimuth.
Output AX AZ.

On the other hand, the digital amplitude value and the ideal amplitude value PAn input to the comparison circuit 6 are compared for each CH number, and the respective amplitude differences are outputted to the average value calculation circuit 7. The average value calculation circuit 7 calculates the average value of the amplitude differences of each CH, and outputs the average value and the amplitude difference of each CH to the angle calculation circuit 8. As shown in FIG. 2, the angle calculation circuit 8 calculates the amplitude difference of each CH, the average value, and MAX
Except for the CH that has the maximum amplitude with the AZ intersection as the origin,
The histogram generation circuit 9 calculates the angle Δθn of each CH.
and output to the determination circuit 10.

The histogram generating circuit 9 generates the angle ΔθHIST that has the largest number of angles in the same angle range, and outputs this to the determining circuit 10. The determination circuit 10 compares the angle Δθn of each CH with the angle ΔθHIST having the largest number of angles, and outputs the antenna number for which the difference is outside a predetermined tolerance value as a faulty antenna number. In this example, the No. 6 antenna has deteriorated and is diagnosed as malfunctioning. In this way, by comparing the amplitude value of the received radio wave with the amplitude value of the ideal pattern, it becomes possible to detect the antenna number that causes an abnormal gain and diagnose this as a failure.

[0011]

Effects of the Invention As explained above, the present invention compares the amplitude value of the signal received by each antenna with the ideal amplitude value based on the CH that is the maximum amplitude value, and uses the obtained amplitude difference to Since antenna failures are diagnosed based on the above, incoming radio waves can be used to detect antennas with gain abnormalities, and the failure can be clearly diagnosed. Furthermore, gain abnormalities due to multipath, shading, etc. can also be diagnosed at the same time. Furthermore, the present invention has the effect of eliminating the need for a device for generating test signals.

[Brief explanation of drawings]

FIG. 1 is a block circuit diagram of an embodiment of a failure diagnosis circuit of the present invention.

FIG. 2 is a diagram for explaining signal processing in the present invention.

FIG. 3 is a block circuit diagram of a conventional failure diagnosis circuit.

[Explanation of symbols]

1a-1n Aerial line 2a~2n converter 3 Receiver 4 Maximum amplitude value calculation circuit 5 Amplitude value generation circuit 6 Comparison circuit 7 Average value calculation circuit 8 Angle calculation circuit 9 Histogram generation circuit 10 Judgment circuit

Claims (2)

[Claims] 1. A plurality of antennas, a converter that converts signals output by the antennas into digital signals, and a receiver that performs a receiving operation by performing calculations on the converted signals.
a maximum amplitude value calculation circuit that detects the maximum amplitude based on the output from the converter and outputs a channel (CH) number corresponding to the antenna, and generates an ideal amplitude value for each CH from the CH number of the maximum amplitude. an amplitude value generation circuit; a comparison circuit that compares the amplitude value of each CH from the converter with the ideal amplitude value and outputs an amplitude difference; and an average value that calculates an average value of the amplitude difference from the amplitude difference of each CH. an arithmetic circuit, an angle arithmetic circuit that inputs the average value of the amplitude difference, the CH number of the maximum amplitude, and the amplitude difference of each CH and calculates the angle of the amplitude difference; and an angle arithmetic circuit that calculates the angle of the amplitude difference by inputting the angle of each CH, A failure diagnosis circuit comprising: a histogram generation circuit that outputs the angle that occurs the maximum number of times; and a determination circuit that determines an error based on the angle of each CH and the angle that occurs the maximum number of times. 2. The fault diagnosis circuit according to claim 1, wherein the number of antennas is four or more.