Helicopter classifying and identifying method based on conventional coherent radar

A helicopter and coherent technology, which is applied in the field of radar target signal classification and recognition, achieves the effects of high detection probability, good real-time performance, and simple engineering implementation

Inactive Publication Date: 2012-07-04
THE 724TH RES INST OF CHINA SHIPBUILDING IND
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art in identifying helicopter targets in ear

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  • Helicopter classifying and identifying method based on conventional coherent radar
  • Helicopter classifying and identifying method based on conventional coherent radar
  • Helicopter classifying and identifying method based on conventional coherent radar

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Embodiment Construction

[0015] The specific implementation steps of the helicopter detection technology and the implementation method of the present invention are as follows, referring to the appended figure 1 :

[0016] (1) Detect and condense the echo IQ data of the receiver to obtain the azimuth and distance center of the target;

[0017] (2) According to the azimuth center (x) and the distance center (y) of the target, extract the target on the same range unit, and the relevant echoes Tn of L times (such as x=0.8) antenna beam width on both sides of the adjacent azimuth, as attached figure 2 Shown; do FFT transformation on Tn, get f Tn ;

[0018] (3) Separate a certain distance unit before and after the target distance, select a section of clutter area, and count the distribution of clutter to obtain the spectral width and intensity of clutter spectrum. The method is as follows:

[0019] In addition to N distance units before and after the target cohesion area, the area without target is sel...

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Abstract

The invention relates to a helicopter detecting and identifying method based on conventional coherent radar. The helicopter detecting and identifying method mainly comprises the following steps of: firstly finding the central position of a target echo by using a detection and aggregation method, and leading echoes of a target and a distance unit to pass through a frequency domain processed and transformed by a FFT (Fast Fourier Transform Algorithm) ; then searching a peak position of a target spectrum, a clutter counting characteristic and a noise counting characteristic, building a helicopter detecting filter and a clutter filter, and leading a target frequency domain to pass through the two filters to detect the rotor Doppler information of the target; and finally distinguishing a filtering result so as to distinguish a helicopter target or a sea-surface target. The method provided by the invention has the advantages of simple engineering realization, good identification effect and the correct rate of more than 85% for the helicopters.

Description

technical field [0001] The invention relates to a helicopter classification and recognition method based on conventional coherent radar, which belongs to radar target signal classification and recognition technology, and is used to realize the classification and recognition of extracted helicopter targets from many slow targets. Background technique [0002] Since the flight speed of the helicopter can range from 0 m / s to tens of m / s, it is difficult to distinguish the helicopter from the surface ship target based on the motion characteristics of the target, especially the helicopter hovering in the air. And if the helicopter can be distinguished from a large number of slow targets, it will be of great significance to the judgment of the troop situation and tactical command. [0003] At present, many detection technologies for researching helicopters use the micro-Doppler characteristics of helicopter blades. For example, in the research report "Micro-Doppler radar signature...

Claims

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Application Information

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IPC IPC(8): G01S7/41
Inventor 管志强籍林峰
Owner THE 724TH RES INST OF CHINA SHIPBUILDING IND
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