Multi-address detection method of Doppler width

Abstract

The invention provides a multi access detection method used for Doppler tolerance, comprising the steps as follows: 1) at the emission end, a driving waveform used for detection is formed and emitted out; the driving waveform cuts the wideband hyperbolic frequency modulation waveforms into N sub-pulses; subsequently, the waveform is composed according to HFM-Costas formed by the resorting of N-order Costas coding sequence; 2) at the receiving end, the echo receiving detection of the driving waveform is carried out. The method of the invention has the technical effects that: compared with the driving waveform compared with the traditional multi access detection method, the HFM-Costas composite waveform in the novel method has better detection robustness on the Doppler tolerance; aiming at the interference-non-interference mixed detection receiving machine of the composite waveform, the Doppler passage searching is not needed, the structure is simple and the hardware cost is low.

Description

technical field [0001] The invention relates to the fields of sonar and radar, and more specifically, the invention relates to an active detection method with multiple access characteristics. Background technique [0002] In the field of active sonar and radar, it is often necessary to consider multi-user issues. For example, in the formation operation of ships or aircraft, multiple sonar or radars need to work simultaneously in the same sea area / space. This requires that the active detection waveforms transmitted by each user can be distinguished to avoid mutual interference, that is, they have multiple access characteristics. [0003] Limited by signal processing capabilities, early sonar / radar systems used simple active waveforms such as single-frequency (CW) pulses and frequency modulation (linear frequency modulation LFM, hyperbolic frequency modulation HFM) waveforms. Such waveforms themselves do not have multiple access performance. In order to achieve multi-user sim...

AI Technical Summary

Problems solved by technology

However, those skilled in the art know that these two waveforms are sensitive to Doppler, which makes the receiver have to perform matching processing on multiple Doppler channels, which not only complicates the structure, but also makes it difficult to completely avoid the degradation of detection performance caused by mismatch.

Although the speed parameters of the target can be measured from the Doppler information, in many applications, the azimuth and distance of the target are more important, but the speed information is not the key point. At this time, the use of Doppler sensitive active waveform will not only reduce the detection efficiency Stickiness, but requires a higher hardware cost

[0004] To sum up, the existing multiple-access detection methods are insufficient in performance or cost

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