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Frequency-modulated continuous wave radar ranging method with high sweep linearity

A frequency-modulated continuous wave and radar ranging technology, which is applied to radio wave measurement systems, radio wave reflection/reradiation, and measurement devices, can solve problems such as limited calibration accuracy and the impact of distance measurement accuracy, and achieve accuracy improvement and accuracy The effect of frequency correction

Inactive Publication Date: 2012-07-11
西安龙之梦网络信息有限公司
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Problems solved by technology

However, the correction accuracy of the above scheme is limited. Generally, the frequency sweep linearity is within 0.1%, which will still have a certain impact on the distance measurement accuracy.

Method used

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  • Frequency-modulated continuous wave radar ranging method with high sweep linearity
  • Frequency-modulated continuous wave radar ranging method with high sweep linearity

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Embodiment Construction

[0013] Such as figure 1 As shown, a frequency-modulated continuous wave radar ranging method with high frequency-sweep linearity, it at least includes a range-echo signal processing unit and a voltage-controlled oscillator (VCO) frequency-sweep linearity correction unit, in the range-echo signal processing unit from The frequency sweep signal received by the antenna 1 passes through the circulator 2 and a branch signal of the transmitted signal enters the mixing circuit 3, and is mixed in the mixing circuit 3 to generate a beat signal, and the beat signal is then amplified by the amplifier circuit 4 The output signal of the amplifying circuit 4 enters the AD sampler 5 and becomes a digital signal and sends it to the DSP processor 7 for spectrum analysis to determine the measured distance.

[0014] The signal output from the VCO transmitting circuit 11 in the frequency-sweeping linear correction unit is divided into three routes through the power amplifier 12, one route directl...

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Abstract

The invention relates to a frequency-modulated continuous wave radar ranging method with high sweep linearity. The frequency-modulated continuous wave radar ranging method at least adopts a distance echo signal processing unit and a voltage-controlled oscillator (VCO) sweep linearity correction unit, and the precision of the sweep linearity can be greatly improved by performing phase correction on sweep frequency of the VCO. The same level with reference frequency can be achieved by performing frequency division on the frequency of the VCO. Then, phases at two frequencies are compared and control voltage of the VCO is adjusted according to phase difference, so that the purpose of precise frequency correction is achieved.

Description

technical field [0001] The invention relates to a frequency modulation continuous wave radar ranging method with high frequency sweep linearity. The invention relates to a frequency-sweeping nonlinear correction method of a voltage-controlled oscillator (VCO), in particular to a frequency-modulated continuous wave (FMCW) radar ranging system based on the frequency-sweeping signal used for liquid level gauges, level gauges, etc. used for ranging. Background technique [0002] Frequency modulation continuous wave radar ranging technology should be widely used in liquid level measurement system. In this system, the VCO emits a linear frequency sweep signal, and the radio frequency signal generates an echo when it hits the liquid surface. Due to the frequency lag of the echo signal, a difference frequency is generated between the frequency of the reflected signal and the frequency of the transmitted signal. The difference frequency It changes with the distance of the measured ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/34G01S7/40
Inventor 陈建文杜冠华贾冬立沈安家李文杰
Owner 西安龙之梦网络信息有限公司
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