Method for calculating moving target angle of time division multiplexed MIMO radar

Abstract

The invention provides a method for calculating a moving target angle of a time division multiplexed MIMO radar. According to specific time division multiplexing time sequences of a transmitting antenna array element and a receiving antenna array element, a virtual antenna array obtains all rounds of receiving signals according a first array element, a second array element, a third array element,a fourth array element, ..., and an MNth array element; and each round of receiving signal obtained by the virtual antenna array is processed as follows: step a, distance direction processing is carried out to obtain a distance direction signal; step b, first digital beam forming processing is carried out, a virtual beam array in which a target is located is extracted by a target detection methodand is synthesized with the distance direction signal, and the target speed is calculated; step c, phase compensation is carried out on the distance directions signal of the target; and step four, second digital beam forming processing is carried out and then a correct angle of the target is calculated. According to the invention, no redundant virtual array element needs to be designed and angle calculation of the low-signal-to-noise-ratio target is realized.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and relates to a method for calculating the angle of a moving target of a time-division multiplexing FM continuous wave MIMO (Multiple Input Multiple Output, 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...

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

This method only uses a single antenn

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