JPS63127176A - Radar target detection system - Google Patents

Abstract

PURPOSE:To detect a target even from pulse data wherein three or more targets are present in a mixed state, by constituting a pulse separation apparatus by utilizing amplitude data. CONSTITUTION:The pulse data from a target are supplied to a data update device 2 through a radar receiver 1. The update device 2 respectively store No.1-n pulse data in pulse data storing memories 3. Next, with respect to pulse data on and after No.n+1, the amplitude value of the newest pulse data is calculated with respect to each memory 3 to be set to the representative value of the memory 3. Then, the amplitude value of the new pulse data is compared with the representative value of each memory 3 and the new pulse data is registered in the memory 3 smallest in the difference between both values. However, when said difference exceeds a definite value, the new pulse data is inputted to the new memory 3. A TOI (the difference of the pulse arrival time data from a radar receiver) histogram forming device 4 forms adjacent TOI histograms. When the histograms are added by an adder 5, only a real target data part is detected as the max. value. The number of the max. values become the number of targets.

Description

[Detailed description of the invention] [Industrial application field] The present invention separates the target radar from the received radar waves.

This invention relates to a radar reverse depth device for detection.

[Conventional technology]

The configuration of a conventional radar depth depth device is shown in FIG.

In the figure, +11 is a radar receiver, and (4) is a device that creates a histogram of the difference in pulse arrival time data (hereinafter abbreviated as TOI) from the radar receiver.

In the conventional equipment configuration, target separation and detection are performed by focusing only on TOI data.

In other words, check the distribution of the TOI between adjacent pulses or the TOI between every other pulse output by the TOI histogram generator (4) in Figure 2, search for the part where it is maximum, and calculate the The target number and target pulse interval are calculated from the number and TOI data.
′ [Problem to be solved by the invention] In the conventional radar inversion depth device, when the number of targets increases, the histogram characteristics change because many radar waves of other targets enter between the pulses being transmitted by each target. There is a problem in that target detection becomes difficult when three or more targets coexist in many cases.

This invention was made to solve the above-mentioned problems, and by using the target radar amplitude value in addition to the pulse arrival time data conventionally used for target separation,
The object of the present invention is to obtain a device that detects the number of targets and the pulse interval of each target from pulse data in which radar waves exceeding the target are mixed.

[Means for solving problems]

The radar linking device according to the present invention performs target detection by locally separating pulse data into target correspondence by correlation processing of amplitude data of received radar waves, and then creating a histogram.

[Effect]

The pulse amplitude data correlation process in this invention compares the amplitude value of new pulse data with the representative value of each group of previously classified pulse data groups, registers the new pulse data in the group Q having the closest value, Update its representative value.

As a result, pulse data is locally classified according to true target correspondence.

〔Example〕

FIG. 1 shows the configuration of the present invention.

(1) is a radar receiver, (2) is a data updater for storing new pulse data from +11 in (3) memory, (3) is a pulse data storage memory, (4) is a TOI histogram creator , (5) is an adder that adds the histogram data of (4) and combines them into one histogram.

The operating principle of this device will be explained below.

The data updater (2) performs the following operations.

- Store the pulse data of 7chi1 to /n in the pulse data storage memory (3). The value of n is a predetermined initial value and represents an arbitrary integer.

・/% Pulse data after n+1 is updated as follows. First, the amplitude value of the newest pulse data is determined for each dark pulse data storage memory, and this value is used as the representative value for that memory.

Compare the amplitude value of the new pulse data with the representative value of each memory,
New pulse data is registered in the memory with the smallest difference.

However, if the difference exceeds a certain value, new pulse data is stored in a new pulse data storage memory.

By the above operation, each pulse data is locally classified into target correspondence. Therefore, when adjacent TO histograms are created using the rOI histogram generator in (4) and the respective histograms are added together using the adder in 5), only the true target data portion will be detected as a maximum value.

This number of maximum values is the target number, and the TOI that gives the maximum value
is the corresponding pulse interval.

Note that in the above embodiment, separation is performed using amplitude data, but if frequency data is stably obtained, analysis can be performed using frequency data.

With such a configuration, it becomes possible to analyze the following objectives.

- Fixed frequency target - Frequency agility target (5ins, ramp, triangular wave type) Furthermore, if a receiver with simultaneous multi-target property (θX, channelized receiver) is used, it is also possible to detect frequency diversity signals.

〔Effect of the invention〕

According to the present invention, since the pulse separation device is configured using amplitude data, it is possible to detect a target even from the beginning of pulse data in which three or more targets are mixed.

Also, for pulses due to unnecessary reflected waves from the ground surface,
The possibility of misrecognizing it as a target is extremely low, and since this process consists only of addition, subtraction, and comparison operations, it is characterized by extremely high speed processing.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the radar target detection device of the present invention, and FIG. 2 is a block diagram of a conventional device. In the figure, (11 is a radar receiver, (2) is a data updater,
(3) is a pulse data storage memory, (4) is a ROR histogram creator, and (5) is an adder. Note that the same reference numerals in the figures indicate the same or equivalent products.

Claims (1)

[Claims] A radar target detection device characterized in that the number of targets and the pulse interval of each target are detected from pulse train data in which a plurality of targets coexist simultaneously by using amplitude information of a received radar wave and pulse arrival time.