Method of Phase Recovery of Radar Moving Target Based on Specific Switching Sequence

Abstract

The invention provides a method for radar moving target phase recovery based on a specific switching gating sequence, and is applied to single-emission multi-reception single-channel frequency modulation continuous wave radar. According to the technical scheme, an array element switching gating sequence of a receiving antenna array refers to a first array element, a fourth array element, a secondarray element, a third array element, a fifth array element, a sixth array element, a seventh array element, an eighth array element, a ninth array element,..., an [N-1]th array element, and an Nth array element, wherein N represents the total array element number of the receiving antenna array, and echo signals of a target are received in a circulated manner with the above switching gating sequence. In a signal processing process, the phases of the former four array element receiving signals are processed, a phase term introduced by movement of the target is extracted, and a phase recovery matrix is constructed to perform phase recovery on the receiving signals of the receiving antenna array. According to the method, the calculation of the speed of the target is avoided, and the method isapplicable to the single-emission multi-reception single-channel frequency modulation continuous wave radar.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and relates to a method for recovering the phase of a radar moving target based on a specific switching gate sequence. Background technique [0002] At present, radar has been widely used in different industries. Among them, FM continuous wave radar has attracted the attention of academia and industry due to its advantages of simple structure and low cost. The existing FM continuous wave radar is usually multi-channel FM continuous Wave radar, that is, each antenna needs a separate receiving channel to receive signals. As the size of the receiving antenna array increases, the volume and cost of the system will also increase. In order to reduce the cost and system complexity of multi-channel FM CW radar, scholars proposed a single-channel FM CW radar [L. Yang and F. Zhenghe, “Switchantenna array with single receiving channel for FMCW radar,” inProc. Int.Symp.Antennas Propagation, ...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this single-channel FM continuous wave radar is that the phase of the signal received by the receiving antenna array is not only determined by the angle of the target, but also related to the speed of the target. Usually, the phase term introduced by the target motion is a fixed constant. In the process of calculating the angle of the moving target, if the phase recovery of the echo signal of the moving target is not performed, it will lead to an error in the calculation of the target angle

The disadvantage of this method is that the target velocity needs to be calculated accurately, otherwise the phase recovery result of the target echo signal will be inaccurate

However, this method is only suitable for FM CW radars with multiple input and multiple output receiving antenna arrays, and cannot be applied to single-channel FM CW radars with single-transmit and multiple-receive

Images