A moving target phase compensation method for mimo radar

Abstract

The invention provides a moving target phase compensation method for MIMO radar. The technical solution is: set the virtual antenna array corresponding to the TDM CW MIMO radar to have MN antenna elements, and the virtual antenna array obtains each round of received signals according to a specific time-division multiplexing sequence, that is: first, the virtual antenna array The first array element receives the signal; then, the virtual antenna array receives the signal in the order of the first array element, the second array element, the third array element, the fourth array element, . . . , the MNth array element. In the signal processing process, the phase term vector introduced by the target motion is extracted by using the received signal of the first element of the virtual antenna array, and the phase compensation matrix is ​​constructed to correct the phase of the received signal of the virtual antenna array. The invention does not need to calculate the target speed, does not need to design redundant virtual array elements, and realizes the phase correction of the moving target without reducing the angular resolution of the radar.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and relates to a moving target phase compensation method for MIMO (Multiple Input Multiple Output) radar. Background technique [0002] Compared with single-input multiple-output radar, MIMO radar can use a smaller-scale antenna array to realize a larger-caliber virtual antenna array, thereby improving the angular resolution of the radar. Frequency modulation continuous wave radar has the characteristics of low cost, simple structure and small size. At the same time, it can accurately measure the distance and speed of the target. Combined with the application of antenna array, it can realize the angle measurement of the target. The frequency-modulated continuous wave MIMO radar combines the advantages of the above two radars, and uses a simpler structure antenna array to achieve higher radar angular resolution. [0003] Time-division multiplexing frequency modulation continuous w...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this method is that the phase of the received signal of the virtual 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. Item compensation, will lead to target angle calculation error

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

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