Radar signal sorting method based on PRI histogram

Abstract

The invention discloses a radar signal sorting method based on a PRI histogram. The method comprises the following steps: establishing the PRI histogram of a radar signal pulse flow; sitting differentjitter ranges for a fixed signal and a dither signal; firstly extracting the fixed signal, and extracting the dither signal, specifically comprising: enabling a box mid-value of each PRI overlappingbox in the PRI histogram to compare with a discrimination threshold: if a value exceeding the discrimination threshold is not existent, zero-clearing the box mid-values of all PRI overlapping boxes inthe PRI histogram; otherwise, using a PRI value corresponding to a peak value exceeding the discrimination threshold as the possible PRI value for performing sequence search; if a sequence is successfully searched, eliminating a detected pulse from the radar signal pulse flow, otherwise, zero-clearing the box mid-values of all PRI overlapping boxes in the PRI histogram, and performing the next order of pulse extraction. The method is capable of improving sorting capacity of the dither signal, and has the better sorting effect to pulse data in a complicated environment.

Description

technical field [0001] The invention relates to a radar signal sorting method based on a PRI histogram, belonging to the technical field of electronic countermeasures. Background technique [0002] Radar signal sorting refers to the process of separating the pulses of the same radar and selecting useful signals from the randomly interleaved pulse stream received by the radar reconnaissance receiver. Pulse repetition interval (PRI) based methods have been one of the most studied and fruitful methods in signal sorting. PRI search method, PRI histogram, and PRI transformation are typical representatives of such methods. PRI histogram includes three typical methods: TOA difference histogram, cumulative difference histogram (CDIF) and timing difference histogram (SDIF). [0003] The TOA total difference histogram is to subtract each TOA from the subsequent TOA, and accumulate each TOA difference to obtain the total difference histogram of the pulse sequence. The main disadvant...

AI Technical Summary

Problems solved by technology

The main disadvantages of this method are: the detection and discrimination threshold is not the best discrimination threshold; the false alarm is high when the pulse loss is serious; it is only suitable for the case of fixed PRI, and the number of differences required to be calculated is large and the harmonic problem is serious, etc.

The advantage of SDIF is that it reduces the amount of calculation compared to CDIF, but its performance decreases due to the lack of inter-level accumulation. The biggest shortcoming of this algorithm is that it cannot process repeated frequency jitter signals.

In actual systems, how to ensure real-time and reliability of sorting results in complex environments is a very difficult task

Images