Pulse Doppler radar polarization anti-jamming method

Abstract

The present invention provides a pulse Doppler radar polarization anti-jamming method under a complicated interference environment. By utilizing the method of the present invention, the inhibition capability aiming at various interference, such as chaffs, active suppression, cheat, etc., can be improved substantially, and the targets can be detected effectively. The method is realized by the following technical scheme of inputting a radar dual polarization echo signal, determining whether the active suppression-type interference exists, when the suppression-type interference exists, carrying out the polarization cancellation; then calculating the target signal walking time between the front and back pulses, and carrying out the range walking correction on a pulse sequence; and then carrying out the phase-coherent accumulation on a dual polarization channel, shifting the zero to a frequency spectrum center in a frequency shift manner, identifying the channel number of a target in a Doppler-range two-dimensional matrix, setting a two dimensional tracking gate of the target, and carrying out the two dimensional constant false alarm detection in the tracking gate; finally, carrying out the target polarization ratio detection determination, and outputting a signal passing the detection determination as a target signal after the interference inhibition, thereby improving the correct detection probability of the target.

Description

technical field [0001] The invention relates to an anti-interference technology in the field of radar detection, in particular to an anti-interference method for effectively detecting a target under interference conditions such as chaff, active suppression and deception. Background technique [0002] Pulse Doppler radar is a pulse radar that uses the Doppler effect caused by the relative motion of the radar and the target to detect the target. Because the radar can effectively suppress ground clutter, it is widely used in the search, capture and identification of tracking targets on airborne, missile-borne and other moving platforms. With the continuous development of jamming technology, pulse Doppler radar is facing more and more complex electronic jamming and natural jamming environment, which significantly reduces the detection performance. How to improve the radar's effective anti-interference and reliable detection capabilities in complex electromagnetic environments a...

AI Technical Summary

Problems solved by technology

Method (1) needs to establish the prior information of the echo waveform of the target or interference, and use the radar received signal to match and identify the prior information to achieve the purpose of distinguishing the target from the interference. However, the radar target echo fluctuates greatly due to the sensitivity of the target attitude. , resulting in low correct recognition rate, poor stability, and poor engineering practicability; method (2) uses the difference in statistical characteristics of the target and interference echoes to extract statistical features such as mean value, variance, and correlation coefficient, and uses classification and recognition methods to classify the target For detection and identification, there are many applications of this kind of engineering, but some features change greatly with the influence of the detection environment. The difficulty lies in selecting effective features for distinguishing between targets and interference

In addition, the above methods are often only effective for one type of interference. When multiple interferences exist at the same time, effective target detection cannot be achieved.

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