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Moving target phase compensation method for MIMO radar

A phase compensation, moving target technology, applied in the direction of using re-radiation, reflection/re-radiation of radio waves, measurement devices, etc., can solve problems such as target angle calculation errors, inaccurate target echo signal phase correction results, etc. The effect of phase correction

Active Publication Date: 2018-10-23
NAT UNIV OF DEFENSE TECH
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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

Method used

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  • Moving target phase compensation method for MIMO radar
  • Moving target phase compensation method for MIMO radar
  • Moving target phase compensation method for MIMO radar

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] figure 1 It is a schematic diagram of the principle of the present invention applied to time-division multiplexing frequency modulation continuous wave MIMO radar (hereinafter referred to as radar). The switch module and the transmitting antenna array, the receiving end of the radar includes the receiving antenna array, the receiving antenna array RF switch module, the single channel receiving module, the phase compensation module and the radar signal processing module, wherein the transmitting antenna array RF switch module is used for switching Through the array elements of the transmitting antenna array, the number of array elements of the transmitting antenna array is M, T m Indicates the mth transmitting antenna array element, m=1,2,...,M; the receiving antenna array radio frequency switch module is used to switch and gate the array element...

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Abstract

The invention provides a moving target phase compensation method for an MIMO radar. The method comprises: a virtual antenna array corresponding to a time-division multiplexed frequency modulated continuous wave MIMO radar is configured to have MN antenna elements; the virtual antenna array obtains each round of received signals according to a specific time-division multiplexing time sequence, wherein the first array element of the virtual antenna array receives signals firstly and then the virtual antenna array receives signals successively according to a sequence from the first array elementto the MNth array element. During the signal processing process, a phase term vector introduced by target movement is extracted by using the receiving signal of the first array element of the virtualantenna array and a phase compensation matrix is constructed to carry out phase correction on the receiving signals of the virtual antenna array. According to the invention, no target speed calculation and no redundant virtual array element are needed; and phase correction of the moving target is realized under the circumstance that the radar angular resolution is not reduced.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/58
CPCG01S13/58
Inventor 林沂付云起杨凯
Owner NAT UNIV OF DEFENSE TECH
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