Multi-channel calibration method of linear frequency modulation signal MIMO radar system
A chirp signal and radar system technology, applied in the field of radar detection, can solve the problems of high complexity and cost, imaging defocus, amplitude and phase inconsistency, etc., and achieve the effect of simple and easy implementation of the calibration method
Active Publication Date: 2020-09-18
苏州理工雷科传感技术有限公司
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Problems solved by technology
Due to the extremely short wavelength of the millimeter wave, the inconsistency in the length and bending of the connecting cables between multiple channels, or the slight differences in connectors, antennas, etc. will cause inconsistencies in amplitude and phase between multiple channels, resulting in problems such as imaging defocus
At present, for the inconsistency of amplitude and phase between multiple channels in MIMO systems, internal calibration systems or high-precision calibration components are mainly used to measure and correct the amplitude and phase differences between multiple channels, and these methods will greatly increase the requirements for system hardware. high complexity and cost
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[0044] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.
[0045] Such as figure 1 Shown, a kind of multi-channel calibration method of chirp signal MIMO radar system, it is characterized in that, comprises the following steps:
[0046] S1: Place the MIMO radar system in an open outdoor area, and place a strong reflection target at a position facing the radar and the vertical distance from the radar is a set distance R, wherein the MIMO radar system includes N t transmit antennas with N r receiving antennas, then there are N=N t ×N r transceiver channels, and N t with N r at least 2.
[0047] For example, if figure 2 As shown, the MIMO radar system is placed in an open outdoor area, and a strong reflective target, such ...
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The invention provides a multi-channel calibration method of a linear frequency modulation signal MIMO radar system. Firstly, a strong scattering target is arranged at the position right opposite to aradar to serve as an auxiliary correction device; secondly, a phase correction factor, an amplitude correction factor and a distance correction factor are obtained through echo data corresponding tothe strong scattering target; under the condition that a linear frequency modulation signal MIMO radar system sends a large-bandwidth signal, amplitude and phase inconsistency parameters between receiving and sending channels are accurately extracted, and finally echo data and the imaging distance are corrected according to three correction factors. Thus, according to the invention, high-precisioncalibration of inconsistency of amplitudes and phases among multiple channels is realized; the calibration precision meeting the imaging requirement can be achieved only through a simple auxiliary calibration device, a complex internal calibration device and a high-precision calibration piece in a traditional method can be removed, the overall calibration method is simple and easy to implement, and the problems that a traditional internal calibration system, a high-precision calibration piece or a complex processing method is high in cost, high in complexity and the like are solved.
Description
technical field [0001] The invention belongs to the technical field of radar detection, in particular to a multi-channel calibration method of a chirp signal MIMO radar system. Background technique [0002] my country is one of the countries with the most serious geological disasters and the most threatened population in the world, among which landslide disasters are the most frequent and most harmful geological disasters. Traditional non-contact measurement methods mainly include close-range photogrammetry, laser scanning measurement, and spaceborne differential interferometry. In recent years, MIMO (Multiple-Input Multiple-Output) slope deformation monitoring radar has , high resolution, continuous detection and other advantages, has become a research hotspot. Due to the comprehensive advantages of the linear frequency modulation continuous wave system in terms of dynamic range, scanning speed, and hardware implementation, it has become a common signal system for MIMO slo...
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IPC IPC(8): G01S7/40
CPCG01S7/4052G01S7/406
Inventor 王宏宇于慧姚迪江志远戴颖超
Owner 苏州理工雷科传感技术有限公司