JPH04235376A - Detecting device of radar signal - Google Patents

Abstract

PURPOSE:To obtain a detecting device of a radar signal which can cope with momentary changes of a clutter area and the intensity of a clutter and which is not affected by an individual difference among operators. CONSTITUTION:The number of radar input signals corresponding to a unit area determined by an azimuth and a distance is counted in a signal number counting circuit, the total sum of the signal intensities of the radar input signals is determined in an input intensity addition circuit, and these are compared with reference values set beforehand, in an area determining circuit. Thereby a clutter area is specified and a clutter area control signal is generated automatically.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radar signal detection apparatus that automatically identifies a clutter area of a radar input signal and detects a valid radar signal.

0002

2. Description of the Related Art FIG. 2 is a block diagram showing a conventional radar signal detection device. In the figure, numeral 1 denotes a quantization circuit that quantizes a received signal S1 obtained by a radar (not shown) and outputs it as a radar input signal S2.

2 is the applied clutter area control signal S3
This is a region control circuit that generates a region signal S4 based on. 3 is a radar signal S effective from the radar input signal S2 from the quantization circuit 1 and the area signal S3 from the area control circuit 2.
This is a signal detection circuit that detects 5.

4 displays a radar video based on a radar signal S5 detected by the signal detection circuit 3, and also sends a clutter area control signal S3 generated by an operator's area specifying operation to the area control circuit 2. It is a radar console.

Next, the operation will be explained. First, a received signal S1 obtained by a radar is quantized by a quantization circuit 1, and is inputted to a signal detection circuit 3 as a radar input signal S2. The signal detection circuit 3 inputs it to the radar console 4 as a radar signal S5 containing clutter.

At the radar console 4, an operator observes the radar video displayed based on the radar signal S5, identifies a portion of the input distribution of the radar signal S5 that is considered to be a clutter area, and generates a clutter area control signal. Create S3. This clutter area control signal S3 is input to the area control circuit 2, which creates an area signal S4, and the signal detection circuit 3
Output to.

The signal detection circuit 3 removes clutter contained in the radar signal S5 based on the area signal S4, outputs a valid radar signal, and displays radar video on the radar console 4.

[0008]

[Problem to be Solved by the Invention] Since the conventional radar signal detection device is configured as described above, the radar signal S
The operator must always identify the clutter area included in 5 from the radar console 4, especially when the clutter area changes moment by moment as time passes, such as clouds, rain, etc. that appear, move, and then disappear. The area must be modified in response to this change, and this is determined by the operator's visual inspection of the radar video.
There were issues such as individual differences in determining clutter intensity and specifying areas.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to automatically identify the clutter area in response to the ever-changing clutter area and clutter intensity. An object of the present invention is to obtain a radar signal detection device capable of detecting radar signals.

0010

[Means for Solving the Problems] A radar signal detection device according to the present invention includes a signal number counting circuit that counts the number of radar input signals corresponding to a unit area determined by direction and distance, and a signal strength of the radar input signals. an input intensity adding circuit for adding up the input intensity sum and calculating the sum of the input intensity, and an area determination circuit for comparing the number of input signals and the input intensity sum with a reference value, identifying a clutter area, and outputting a clutter area control signal. It is something that

[0011]

[Operation] The area determination circuit of the present invention calculates the counted value of the number of radar input signals corresponding to a unit area determined by the direction and distance counted by the signal number counting circuit, and the radar input determined by the input intensity adding circuit. By comparing the total signal strength of the signal with a preset reference value to identify the clutter area and automatically generating a clutter area control signal, it is possible to adjust to momentary changes in the clutter area and clutter intensity. We will realize a radar signal detection device that can respond to the above requirements.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a quantization circuit, 2 is a region control circuit, and 3 is a signal detection circuit, which are the same or equivalent parts to those in the conventional system with the same reference numerals in FIG. 2, so a detailed explanation will be omitted. .

5 is a radar input signal S from the quantization circuit 1 corresponding to a unit area determined by direction and distance.
This is a signal number counting circuit that counts the number of 2 and outputs it as the number of input signals S6. Reference numeral 6 denotes an input strength adding circuit that adds the signal strengths of the radar input signals S2 to obtain a total sum, and outputs the sum as an input strength sum S7.

Reference numeral 7 denotes an area control signal generation circuit which receives the azimuth signal S8 as an input and generates an area control signal S9 based on the azimuth signal S8. 8 receives the area control signal S9 from the area control signal generation circuit 7, and sets the number of input signals S6 from the signal number counting circuit 5 and the input intensity sum S7 from the input intensity adding circuit 6 to preset reference values. This is an area determination circuit that identifies a clutter area by comparing it with each clutter area determination value, automatically generates a clutter area control signal S3, and outputs it to the area control circuit 2.

Next, the operation will be explained. A reception signal S1 received by the radar is input to a quantization circuit 1, and a radar input signal S2 quantized and outputted by the quantization circuit 1 is input to a signal number counting circuit 5 and an input intensity addition circuit 6. Ru.

The signal number counting circuit 5 counts and stores the number of input signals of the radar input signal S2 for each set unit distance in a memory within the circuit. Similarly, the input strength adding circuit 6 also adds and stores the signal intensities of all the signals input for each set unit distance in a memory within the circuit.

On the other hand, the area control signal generation circuit 7 receives the azimuth signal S8 as an input, and outputs the area control signal output azimuth (
For example, if it is every 10 degrees, 10 degrees, 20 degrees, 30 degrees...
360°), an area control signal S9 is output to the area determination circuit 8.

In the area determination circuit 8, this area control signal S
9 is input, the area specified by the area control signal S9 (for example, if it is 20°, the number of input signals S6 for each unit distance of 10° to 20° and the total input strength S7 are calculated by counting the number of signals. The signals are read from the memories in the circuit 5 and the input strength adding circuit 6, respectively.

The area determination circuit 8 then compares the read input signal number S6 with a first clutter area determination value preset in the memory of the area determination circuit 8. As a result, if the number of input signals S6 is larger, the clutter area control signal S3 is output to the area control circuit 2 as a clutter area.

Furthermore, if the number of input signals S6 is smaller,
A comparison is made between the input intensity sum S7 for each unit distance read from the input intensity adding circuit 6 and a second clutter area judgment value preset in the memory of the area judgment circuit 8. As a result, if the input intensity sum S7 is large, the clutter area control signal S3 is output to the area control circuit 2 as a clutter area.

When the area control circuit 2 receives the clutter area control signal S3, it generates an area signal S4 for each unit area (area of unit distance x unit method) and outputs it to the signal detection circuit 3. The signal detection circuit 3 always operates using the latest area signal S4 to reject radar input signals S2 below it. This makes the valid radar signal S5
will be automatically detected.

[0022] In the above embodiment, a two-dimensional radar signal detection device of the azimuth versus distance of the radar that rotates constant in the azimuth direction was explained, but a three-dimensional radar signal detection device that adds altitude (or elevation angle) to this has been described. It can also be applied to a radar signal detection device and works in the same way as in the above case.

[0023]

As described above, according to the present invention, the count value of the number of radar input signals corresponding to a unit area determined by the azimuth and distance and the total signal strength of the radar input signals are
The configuration is configured to identify the clutter area by comparing it with a preset reference value and automatically generate a clutter area control signal, making it easy to respond to momentary changes in the clutter area and clutter intensity, making it easy to operate. This has the effect of providing a radar signal detection device that is not affected by individual differences among personnel.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a radar signal detection device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a conventional radar signal detection device.

[Explanation of symbols]

1 Quantization circuit 2 Area control circuit 3 Signal detection circuit 5 Signal number counting circuit 6 Input strength addition circuit 8 Area determination circuit In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A quantization circuit 1 that quantizes a received signal obtained by a radar to generate a radar input signal; a signal number counting circuit 5 that outputs it as the number of input signals; an input strength addition circuit 6 that adds the signal intensities of the radar input signals to obtain the sum; and outputs the sum as the input intensity sum; and the input intensity summation are compared with a preset reference value to identify a clutter area and output a clutter area control signal; and an area determining circuit 8 that generates an area signal from the clutter area control signal. A radar signal detection device comprising a control circuit 2 and a signal detection circuit 3 that detects a valid radar signal based on the radar input signal and the area signal.