Signal processing method for eliminating static clutter interference of FMCW radar

A clutter interference and signal processing technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as increasing the hardware complexity of the system, and achieve the effect of eliminating influence and improving extraction accuracy.

Active Publication Date: 2018-01-19
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

Since it is difficult to separate the signal components caused by different scattering points from the baseband beat signal, the interference of static clutter is often eliminated from the perspective of hardware, such as placing strong reflection points on the target object or additional frequency shifting, frequency doubling devices, etc. , but increases the complexity of the system hardware and limits the application of this technology

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  • Signal processing method for eliminating static clutter interference of FMCW radar
  • Signal processing method for eliminating static clutter interference of FMCW radar
  • Signal processing method for eliminating static clutter interference of FMCW radar

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Embodiment Construction

[0035] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0036] Vibration monitoring based on FMCW radar is a non-contact medium and short-range vibration monitoring technology. Using the distance resolution capability of FMCW radar, it can distinguish objects at different distances in the radar radiation space, but it cannot distinguish multiple objects in the same distance unit. object. figure 1 It is a schematic diagram of FMCW radar static clutter interference in an embodiment of the present invention; as figure 1 As shown, the radar cannot effectively d...

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Abstract

The invention provides a signal processing method for eliminating static clutter interference of FMCW radar. The method comprises the following steps: step one, estimating amplitude a-hat of base-bandcomposite beat signals during each frequency sweep period; step two, obtaining a discrete point (R[i], I[i]) sequence on a complex plane on the basis of an estimated amplitude time sequence and a known initial phase time sequence; step three, performing circle center estimation fitting on the discrete point (R[i], I[i]) sequence on the complex plane; step four, performing correction compensationon offset of the circle center, and obtaining a corrected Ru[i] and a corrected Iu[i]; and step five, taking a phase angle of a complex discrete point (Ru[i], Iu[i]) sequence, and obtaining a corresponding phase time sequence. Correction compensation is conducted on the estimated phase time sequence on the basis of signal post-processing, so interference of static clutter in vibration monitoring of target object can be eliminated effectively and the extraction precision of vibration displacement amplitude can be improved.

Description

technical field [0001] The invention relates to the technical field of radar monitoring, in particular to a signal processing method for eliminating static clutter interference of FMCW radar. Background technique [0002] Generally, the radar emits a certain form of electromagnetic waves, receives the electromagnetic echo signals scattered by the target object, and obtains the baseband signal through frequency mixing and filtering. By analyzing the frequency and phase information of the baseband signal, the distance, speed and other information of the monitoring target can be extracted. Typically, a linear frequency modulation continuous wave (Linear Frequency Modulation Continuous Wave, LFMCW for short) radar transmits a linear frequency modulation continuous wave to obtain an intermediate frequency baseband beat signal. The corresponding distance information is obtained by estimating the frequency of the beat signal. However, due to the limitation of the radar transmissio...

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Application Information

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IPC IPC(8): G01S7/41
Inventor 彭志科熊玉勇
Owner SHANGHAI JIAO TONG UNIV
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