JPS60114781A - Ssr target detecting apparatus - Google Patents

Abstract

PURPOSE:To perform the stable detection of a target by suppressing the omission of the target or the judgement impossibility of a code, by adding target tracking and estimating function to the secondary radar target detecting apparatus in a radar control system. CONSTITUTION:A target detecting part 2 outputs target data consisting of information of a position, where the information of a video signal is converted to digital information, and code information. This target data is sent to a gate/ code correlation circuit 3 and used in investigating whether said target data is present in the gate of an estimated azimuth and distance calculated in a tracking part 4 and obtained from a response target ahead one scan and sent to the tracking part 4 after receiving appropriate processing. In the tracking part, the correlation of the target data and data till previous scan is taken to calculate an estimation gate for the next scan and this estimation gate is sent to a gate code correlation part 3. The target data subjected to correlation processing in the tracking part 4 is sent out from an output terminal 11 through an interface 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a 5SR system used in a radar control system.
(Secondary radar) Relating to a target detection device.

Conventionally, this type of 88R target detection device is II'i.

M, 1.8kolnik[i″' l(,AI)At(
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38-22 to 38-25 (published by i 11 companies in 1970)
As described in the paper, target detection is performed using a sliding window method.

This sliding window method will be explained from one side. FIG. 1(a) is a schematic diagram of a secondary radar, and FIG. 1(b) is a schematic diagram of a sliding window.

In FIG. 1(a), the center line B of the beam radiated from the SSa antenna A and the response position (hit) of the target are shown, and the sweep is the radiation of an interrogation pulse train in a particular direction. The range t range pin is a range divided by a certain range interval (for example, l/4NM) in the distance direction, and this figure shows that the target response was in the range bin m from the n sweep itself to the 1147 sweep. There is.

FIG. 1(b) shows a sliding window corresponding to FIG. 1(a). The target is investigated by storing the response data in memory, and the number of responses in the sweep direction ff for the range bin mVC that collects the responses: In the case of investigation, the Q frame is the slitting window.In this figure, , the window size is 8, and the leading edge detection criterion is 3 (: If there is a HII!il hit, the leading edge and 44
), and the trailing edge detection criterion is set to 3. The leading edge and the trailing edge are determined by subtracting a certain amount of deviation from the detection points of the front line and the trailing edge, and the target orientation is determined exactly at the midpoint between the leading edge and the trailing edge.

In this sliding window method, all response data (hits) are stored in memory divided into distance and azimuth units (lunge bins and l sweeps), and these response data τ are always divided into window size units (for example, 8).
When the number of responses exceeds the A foot value (Ns: for example, 3)? This is the front line in the azimuth direction of the target, and the time when the response becomes less than the A foot value (NB: for example, 3) is the trailing edge in the azimuth direction of the target. has been carried out. By the way, the values Ns and N, which determine the leading edge and trailing edge, cannot be set below a certain value in order to completely remove the fruit, which is an asynchronous signal. Therefore, the occurrence of a gurgle state or a split state of the SSR target Some parts.

There is a drawback that if the target response falls below a certain value, the target will be missing.

It is an object of the present invention to provide an SSR target 4 loading device which can minimize the problems of missing targets and inability to use codes that have conventionally occurred, and can perform stable target detection.

The configuration of the uninvented 8SR target detection device includes a target detection unit that detects all target position data from the received video signal of the secondary radar in accordance with detection reference values for the front and rear areas used, and this target detection unit. a target tracking calculation unit that calculates the correlation between the target position data and the previous position data and a prediction of the next position data to form a prediction gate, and a prediction gate of this target tracking calculation unit and the target position data. A correlation processing unit that sets the correlation between the 9 and 9 valley detection reference values? and outputs target data subjected to correlation processing by the target tracking calculation unit.

In our invention, we added target tracking and prediction functions to the functions of the conventional SSR target detection device, and performed all correlation processing with the position data and code data measured by the SSU reception meter,
The result is used as a detection standard for all SSR targets.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a block diagram of an embodiment of the invention.

First, the response number 1M sent from the aircraft is received by the SSR receiver, outputted as an SS video signal, and inputted to the decoder section 1 from the input terminal 1O. This decoder section 1
The bracket pulse and each of the six codes are detected and input manually to the target detection section 2. This target detection section 2 outputs target data consisting of position and code information obtained by converting video signal information into digital information. This target data is
The code is sent to the code correlating unit 3, h1° is calculated by the tracking unit 4, and it is checked whether the code is at the predetermined gate (multiple) of direction and distance m11j obtained from the response one building up to one scan ago.

And this game), the goal in 17-1 is, -'c-
Correlation is made with the code information corresponding to the gate of , and if there is a 4-old man, the sliding window parameters (N and NB)' of the target detection unit 2 are changed to a specified value of I:1 or more. Furthermore, if the target detection section 2 detects the trailing edge, the parameters are returned and Nuffi is returned to its original value.

The detected target data is sent to the tracking unit 4.

This tracking unit 4 has a memory and a data processing unit, and the tracking unit 4 calculates the correlation t and 9 between this target data and the fυ data up to the previous scan, the prediction gate pattern model for the next scan, Then, send this spear to sub-gate gold gate code phase 4 part 3. Then, the target data subjected to the correlation processing in the lower part 4 is sent out from the output terminal 11 after reaching the interface part 5.

As explained above, since the invention has a configuration in which a tracking function is added to the conventional QSS ratio target detection device, it is possible to detect 6 targets t, which were conventionally thrown away as fruit. .

The non-inventive feature is that past data is used as part of the criteria for target detection of SS 几, and any difference in the correlation method or detection criteria with past takes does not affect the non-patent claims.
It does not give

[Brief explanation of the drawing]

FIG. 1(a) is a schematic diagram showing the radar sweep and response meeting; FIG. 1(b) is a schematic diagram illustrating the entire operation of the sliding window; FIG. In the figure, 1...Decoder section, 2...Target detection section (sliding line detector), 3...
・Gate code correlation section, 4... Tracking section, Death・
...Interface section, 10...Input terminal, 11...Output terminal. It is.

Claims (1)

[Claims] a target detection unit that detects target position data from the received video signal of the secondary radar according to detection reference values of the leading edge and trailing edge of the desired foot; and a target position take and previous position data from the target detection unit; The target tracker calculates the correlation between 9 and 9 and calculates the prediction of the next position data by H1° and forms a prediction gate.
J4. A correlation processing section that sets all of the detection reference values of the prediction gate of this target tracking calculation section and the target position data, and a correlation processing section that sets all of the detection reference values of the target tracking calculation section. 88 characterized by outputting all data
R target detection device.