Phase compensation method for moving object via phase compensation matrix

Abstract

The invention provides a phase compensation method for a moving object via a phase compensation matrix. A single-channel FM continuous wave radar receives each round of signals according to a specificswitching and gating sequence by that a first array element of a reception antenna array is switched and gated to receive one FM period of signals; all array elements in the reception antenna array are switched and gated successively from the first array element, N FM periods of signals are received, and N represents the number of array elements of the antenna array; and target echo signals are received cyclically according to the switching and gating sequence. In the signal processing process, reception signals in two FM periods of the first element array are used to extract a phase term vector introduced by target movement, and the phase compensation matrix is used to carry out phase correction on the reception signals of the reception antenna array. According to the method, it is not required to calculate the target speed, and the method is suitable for the single-emission multi-reception single-channel FM continuous wave radar.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing and relates to a method for phase compensation of a moving target by using a phase compensation matrix. 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, Fukuoka, Japan, ...

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 compensation is not performed on the echo signal of the moving target, the calculation of the target angle will be wrong

The disadvantage of this method is that the target speed needs to be calculated accurately, otherwise the phase compensation 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

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