JPH0843526A - Tracking processor - Google Patents

Abstract

PURPOSE:To provide a tracking processor which can surely track an airplane of any type and which can present precise positional information to an operator. CONSTITUTION:The distance Ri and the reception strength A1 of a target airplane obtained by a radar apparatus are input, and an airplane estimation part 4 computes the radar reflection cross section sigmai, of the target airplane. By referring to a type file 5, the type Pi of the target airplane is estimated. A tracking-smoothing-constant decision part 6 decides tracking-smoothing constants ALPHAi, BETAi which can follow the circling performance of the estimated type Pi. By using the tracking-smoothing constants, a tracking processing part 3 executes a tracking processing operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radar information processing apparatus, and more particularly to a tracking processing apparatus for tracking a target.

[0002]

2. Description of the Related Art In the tracking process of a target aircraft in a radar information processing apparatus, the target aircraft information for the next scan is predicted based on the target aircraft information captured by the scan, and the predicted information and the actually observed target aircraft information. The time transition state of each target aircraft is determined by determining the correlation with. At that time, since the position information of the target aircraft obtained by the radar includes various measurement errors, smoothing processing is performed according to the motion state of the target aircraft to improve the tracking performance. The values of the smoothing constants (for example, α and β) for performing this smoothing process need to be determined in consideration of the followability with respect to the turning of the target aircraft and the avoidance of multiple correlation.

[0003]

However, the turning performance of an aircraft actually differs depending on the model. In the conventional tracking processing, since this is handled uniformly, it may be impossible to continue tracking for a model with high turning performance, and as a result, incorrect position information is provided to the operator. Was occurring.

An object of the present invention is to provide a tracking processing device capable of reliably tracking any type of aircraft and presenting accurate position information to an operator.

[0005]

A tracking processing device according to the present invention is a cross-sectional area calculating means for calculating a radar reflection cross-sectional area of a target aircraft based on the distance of the target aircraft and the reception intensity of reflected waves obtained by the radar device. And a model estimating means for estimating the model of the target aircraft using the radar reflection cross section, a tracking smoothing constant determining means for determining a tracking smoothing constant capable of following the estimated turning performance of the model, and the determined tracking. Tracking processing means for executing tracking processing using a smoothing constant.

[0006]

The radar reflection cross section is calculated from the distance of the target aircraft and the reception intensity of the reflected wave, and the model of the target aircraft is estimated by this. The tracking smoothing constant that can follow the estimated turning performance of the model is determined, and the tracking processing is executed using the constant.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a schematic block diagram showing an embodiment of a tracking processing device according to the present invention. The position data (Ri, θi) of the target aircraft and the reception intensity data (Ai) of the reflected radio waves captured by the radar device 1 are coordinate-converted by the input processing unit 2, and the position data (Xi, Yi) and the distance data (Ri) are obtained. And reception intensity data (Ai). The position data (Xi, Yi) is output to the tracking processing unit 3, and the distance data (Ri) and the reception intensity data (Ai) are output to the aircraft estimation unit 4.

As will be described later, the aircraft estimating section 4 calculates the radar reflection cross-sectional area σi and determines the model Pi of the target aircraft from the cross-sectional area using the model file 5. The tracking smoothing constant determination unit 6 determines tracking smoothing constants αi and βi that can follow the turning performance of the determined model Pi, and outputs the tracking smoothing constants αi and βi to the tracking processing unit 3. Therefore, the tracking processing unit 3
Then, a tracking process capable of following the turning performance of the target aircraft is performed and displayed on the display unit 7. This embodiment will be described in more detail.

FIG. 2 is a more detailed block diagram of the present embodiment shown in FIG. In the figure, a correlation processing unit 31, a track file 32, a smoothing processing unit 33, and a prediction processing unit 3
4 corresponds to the tracking processing unit 3 in FIG. 1, and includes a radar reflection cross section calculation unit 41, a radar reflection cross section smoothing processing unit 42,
The radar reflection cross-sectional area file 43 and the aircraft model determination unit 44 correspond to the aircraft estimation unit 4 in FIG.

In FIG. 2, the position data (Xi, Yi) coordinate-converted by the input processing unit 2 is input to the correlation processing unit 31, and the correlation processing unit 31 acquires the position data (Xi, Yi) captured this time and the track. A correlation determination is made as to whether or not the difference with the predicted position data (Xpi, Ypi) input from the file 32 is within a certain range, and the position data (Xi, Yi) determined to have a correlation is smoothed. It is output to the unit 33. Specifically, assuming that Xg and Yg are constants determined by the performance of the radar device, | Xi−Xpi | ≦ Xg and | Yi−Ypi | ≦ Y
If g, it is determined that there is a correlation, and in other cases, there is no correlation.

On the other hand, the distance data (R
i) and the received intensity data (Ai), the radar reflection cross section calculation unit 41 calculates the radar reflection cross section σ by the following equation.
Calculate i. However, K is a constant determined by the performance of the radar device.

Radar reflection cross section: σi = K · Ai · Ri ⁴ .

The radar reflection cross section smoothing processing unit 42 inputs the smoothed radar reflection cross section σsi from the radar reflection cross section file 43 and performs the smoothing process of the calculated radar reflection cross section σi. Specifically, when μ is a smoothing constant (0 <μ <1) of the radar reflection cross section, the smoothed radar reflection cross section σsi + 1 is obtained by σsi + 1 = σsi + μ (σi−σsi). The smoothed radar reflection cross-sectional area σsi + 1 calculated in this way is input to the aircraft model determination unit 44.

The aircraft model determination section 44 uses the input smoothed radar reflection cross section σsi + 1 to input the aircraft model file 5
To identify the corresponding model Pi. For example, if the radar reflection cross section of a certain model Pi is σpi ± Δσpi, the model of σsi + 1 that satisfies σpi−Δσpi ≦ σsi + 1 ≦ σpi + Δσpi is determined as Pi. In the aircraft model file 5, for example, the model Pi and its radar reflection cross section σpi ± Δσpi may be stored in a table format.

The aircraft model Pi thus identified
Is input to the smoothing constant determination unit 6, and tracking smoothing constants αi and βi that can correspond to the turning performance of the aircraft model Pi are determined and output to the smoothing processing unit 33.

The smoothing processing unit 33 receives the predicted position data (Xpi, Ypi) and the smoothing velocity data (dXsi, dYsi) input from the track file 32 and the tracking smoothing constant αi determined by the smoothing constant determining unit 6. And βi, the position data (Xi, Y
Tracking smoothing processing is performed on i). That is, the smoothed position data (Xsi + 1, Ysi + 1) and the smoothed velocity data (dX
si + 1, dYsi + 1), where T is the antenna rotation period of the radar device, Xsi + 1 = Xpi + αi (Xi−Xpi) Ysi + 1 = Ypi + αi (Yi−Ypi) dXsi + 1 = dXsi + βi (Xi−Xpi) ) / T dYsi + 1 = dYsi + βi (Yi−Ypi) / T.

The smoothed position data (Xsi + 1, Ysi + 1) and the smoothed velocity data (dXsi + 1, dYsi + 1) which have been smoothed according to the model of the target aircraft are It is stored in the file 32 and is output to the prediction processing unit 34.

In the prediction processing unit 34, the predicted position data (Xpi + 1, Ypi + 1) for the next scan is calculated by Xsi + 1 = Xsi + 1 + dXsi + 1T Ysi + 1 = Ysi + 1 + dYsi + 1T And is stored in the track file 32. Hereinafter, each time the antenna of the radar device 1 is scanned, the above arithmetic processing is performed under the timing control of the data control unit 8,
A tracking process corresponding to the turning performance of the target model is executed.

[0020]

As described in detail above, the tracking processing apparatus according to the present invention estimates the model of the target machine from the radar reflection cross section calculated from the distance and the reception intensity of the target machine, and A tracking smoothing constant that can follow the turning performance is determined and tracking processing is executed. For this reason, it is possible to perform tracking processing corresponding to the aircraft model, and it is possible to provide the operator with accurate position information for any aircraft.

[Brief description of drawings]

FIG. 1 is a schematic block diagram showing an embodiment of a tracking processing device according to the present invention.

FIG. 2 is a more detailed block diagram of the present embodiment shown in FIG.

[Explanation of symbols]

 1 radar device 2 input processing unit 3 tracking processing unit 4 aircraft estimation unit 5 model file 6 tracking smoothing constant determination unit 7 display unit 8 data control unit 31 correlation processing unit 32 wake file 33 smoothing processing unit 34 prediction processing unit 41 radar Reflection cross section calculation unit 42 Radar reflection cross section smoothing processing unit 43 Radar reflection cross section file 44 Aircraft model determination unit

Claims (4)

[Claims] 1. A tracking processing device for tracking a target aircraft based on information obtained by a radar device, the target aircraft being based on the distance of the target aircraft and the reception intensity of reflected waves obtained by the radar device. Cross-sectional area calculation means for calculating the radar reflection cross-sectional area of, the model estimation means for estimating the model of the target aircraft using the radar reflection cross-section, the tracking smoothing constant that can follow the turning performance of the estimated model A tracking processing device comprising: a tracking smoothing constant determining unit that determines the tracking smoothing constant; and a tracking processing unit that performs a tracking process using the determined tracking smoothing constant. 2. The tracking processing means, a correlation processing means for inputting the position information of the target aircraft obtained by the radar device to judge the correlation with the predicted position information, the tracking smoothing constant and the predicted position. Smoothing processing means for performing a smoothing process on the position information determined to have the correlation using the information and the predicted smoothing speed information; and the smoothed position information and the smoothing position information obtained by the smoothing process. The tracking processing device according to claim 1, further comprising: a prediction processing unit that calculates predicted position information using the conversion speed information. 3. The cross-sectional area calculating means calculates the radar reflection cross-sectional area of the target aircraft based on the distance of the target aircraft and the reception intensity of the reflected wave obtained by the radar device, and the calculation means. Smoothing the radar reflection cross section,
The tracking processing device according to claim 1 or 2, further comprising: a cross-sectional area smoothing processing unit that outputs the smoothed radar reflection cross-sectional area to the model estimating unit. 4. The tracking processing apparatus according to claim 1, wherein the model estimation unit has a memory unit that stores a model of the aircraft and a radar reflection cross section thereof.