Pulse defect based radar signal characteristic sequence search method

Abstract

The invention relates to a pulse defect based radar signal characteristic sequence search method, and mainly solves the problem of radar signal characteristic sequence search failure caused by loss ofcaptured pulse defects. The method is implemented by the steps of 1, calculating a time difference of arrival between each pulse and a previous pulse in an input pulse cache; 2, carrying out carrierfrequency, pulse width and amplitude tolerance condition judgment on input pulses; 3, performing time-difference-of-arrival tolerance condition judgment on the input pulses; 4, searching and confirming a radar signal characteristic sequence head; 5, searching a complete radar signal characteristic sequence; and 6, judging the pulse number of each pulse sequence obtained by searching, and outputting all characteristic sequences meeting the conditions. The method is beneficial to the improvement of the radar signal characteristic sequence search success rate and can be used for a radar passive detection system.

Description

technical field [0001] The invention belongs to the technical field of radar data processing and signal sorting. Background technique [0002] The signals radiated by phased array radar at different wave positions usually have different signal characteristics, and the carrier frequency, repetition period, pulse width, etc. will all change. Correspondingly, the phased array radar signal intercepted by the receiver usually exists in the form of pulse sequence segments, and each sequence segment contains several to dozens of continuous pulses, with similar frequency, pulse width, amplitude, and adjacent The arrival time difference of the pulses satisfies a specific modulation form. The pulse sequence segment of the above form is called the characteristic sequence of the radar signal. [0003] For typical complex emitter signals such as phased array radar, the signal sorting process usually includes: complex signal PDW clustering, complex signal pulse sequence search, complex ...

AI Technical Summary

Problems solved by technology

[0004] However, the phenomenon of pulse defect often occurs in the actual interception situation.

The defect loss of the pulse will lead to the wrong calculation of the pulse repetition period, which will lead to the failure of the feature sequence search

On the one hand, this part of the pulse is not successfully sorted, which affects the calculation accuracy of the radiation source EDW; on the other hand, the unsuccessfully selected pulse may cause false alarms and interfere with the sorting of similar signals with other parameters

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