Slice interference suppression method for sub-band frequency coding

Abstract

The invention discloses a slice interference suppression method for sub-band frequency coding, and mainly solves the problem that a target cannot be correctly recognized when interference signal energy is greater than signal energy due to the fact that interference data which is intermittently sampled and forwarded cannot be eliminated only by utilizing correlation in the prior art, and the target cannot be correctly recognized when the interference signal energy is too large. And the interference residue of the transition zone submerges the adjacent target signal segment, so that the target cannot be correctly identified. The method comprises the following specific steps: 1, estimating slice interference parameters; 2, generating a transmitting signal of an intra-pulse sub-pulse frequency; 3, coding the sub-pulse frequency of the transmitted signal according to the interference parameter; 4, constructing an echo signal waveform containing interference and a target; and 5, segmented pulse pressure interference resistance is realized. According to the method, frequency bands of sampled and forwarded sub-pulses and non-sampled sub-pulses are respectively concentrated through frequency coding, so that the target detection probability, the target accumulation gain and the target detection reliability are improved.

Description

technical field [0001] The invention belongs to the technical field of radar, and further relates to a sub-band frequency coding slice interference suppression method in the technical field of radar signal processing. The invention can be used for encoding the sub-pulse frequency in a pulse, so as to suppress intermittent sampling and forwarding interference so as to correctly identify targets. Background technique [0002] The transponder spoofing jamming based on Digital Radio Frequency Memory (DRFM) has a great similarity with the target signal, which has a serious impact on radar target recognition and detection, especially the intermittent sampling transponder jamming can quickly and accurately The echo signal is sliced ​​and sampled, so that the interference signal and the target echo signal arrive at the receiver within the same pulse repetition period, forming multiple false target interference bands. Aiming at this kind of interference, conventional pulse-to-pulse ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the shortcomings of the above-mentioned prior art, and propose a slice interference suppression method of sub-band frequency coding, which is used to solve the problem in the prior art that when the energy of the interference signal is greater than the energy of the signal, only by reducing the echo and intermittent sampling The interference correlation method cannot distinguish the target from the interference in the signal, and when the interference-to-signal ratio is too large, the transition zone of the intra-pulse step-chirp waveform will submerge the target signal segment after being sampled and forwarded by the jammer, resulting in The problem of not being able to correctly identify the target

The present invention divides the radar transmission signal pulse into sub-pulses and encodes the frequency of the sub-pulses, so that the sub-pulses are orthogonal to each other in the frequency domain and cover each other, and the pulse pressure can be divided according to the carrier frequency and bandwidth of each sub-pulse Eliminate the interference data that is intermittently sampled and forwarded by the jammer, and solve the problem that the existing technology cannot eliminate the interference pulse by using correlation, resulting in the failure to identify the target when the energy of the interference signal is greater than the energy of the signal

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