Direct-current offset compensation method for radar sensor
A radar sensor, DC offset technology, applied to instruments, utilizing re-radiation, reflection/re-radiation of radio waves, etc., can solve the problems of polluted signals, DC offset uncertainty, affecting the linear performance of demodulated signals, etc. Achieve high robustness and eliminate the effect of DC offset components
Active Publication Date: 2019-08-16
ZHEJIANG UNIV
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Problems solved by technology
However, due to the uncertainty of the DC offset in the quadrature baseband signal, it will affect the linearity of the signal demodulated by the general arctangent operation
Moreover, in the actual application process, it is unavoidable that some interference motions will pollute the signal generated by the useful motion of the target, and the robustness requirements for the DC offset compensation algorithm are very high.
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[0023] The implementation process of the present invention will be described in detail below in conjunction with the drawings in the embodiments of the present invention.
[0024] Such as figure 2 As shown, the specific implementation adopts the following radar sensor system, including a radar transmitter and a radar receiver. The radar receiver is a quadrature down-conversion framework, and is connected to the excitation signal source after a filter, a mixer, and a digital-to-analog converter. The frequency converter is connected through the local oscillator, the amplifier and the radar transmitter in turn; the radar transmitter emits electromagnetic waves to the moving object, and is received by the radar receiver after being reflected on the surface of the moving organism to be measured.
[0025] In the radar sensor, the RF front-end module transmits electromagnetic waves to the surface of the moving target to be measured through the antenna, and the down-conversion module...
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The invention discloses a direct-current offset compensation method used for a radar sensor. The direct-current offset compensation method is characterized in that a moving object is measured with theradar sensor; the circle center of a baseband signal constellation diagram is found and located according to a baseband signal obtained by orthogonal down conversion of a radar receiver in the radarsensor; a direct-current offset component is determined through the coordinates of the circle center; and the baseband signal is corrected and compensated with the direct-current offset component. Through adoption of the method, useless direct-current components are removed, and the motion information of the object under measurement can be recovered by phase information demodulated with algorithmssuch as an arc tangent algorithm. The useless direct-current components can be removed accurately in the presence of a large number of interference signals, and a good baseband signal is provided forsubsequent extraction of the motion information of a target.
Description
technical field [0001] The invention relates to a DC offset compensation method for a radar sensor, in particular to a DC offset compensation method with high robustness under the condition of severe noise. Background technique [0002] In recent years, radar sensors have been widely used in various fields, such as life signal detection, gesture recognition and so on. However, due to the problem of uncertain DC offset in the quadrature baseband signal, it will affect the linear performance of the signal demodulated by the general arctangent operation. Moreover, in the actual application process, it is unavoidable that some interference motions will pollute the signal generated by the useful motion of the target, and the robustness requirements of the DC offset compensation algorithm are very high. Contents of the invention [0003] In order to solve the problems in the background technology, the present invention proposes a DC offset compensation method for radar sensors....
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Login to View More IPC IPC(8): G01S13/88G01S13/02G01S7/36
CPCG01S7/36G01S13/02G01S13/88
Inventor 董淑琴冉立新
Owner ZHEJIANG UNIV