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FMCW laser ranging beat signal frequency estimation method and system

A technology of beat signal and laser ranging, applied in radio wave measurement system, measurement device, electromagnetic wave re-radiation and other directions, can solve the problems of large amount of data processing and calculation, slow frequency calculation speed, low frequency resolution, etc. To achieve the effect of improving the frequency solution speed, improving the frequency resolution, and reducing the amount of data processing

Active Publication Date: 2021-08-10
杭州国节能源技术有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of high sampling rate, slow frequency solution speed, large amount of data processing calculation and low frequency resolution in the current beat signal frequency estimation method, and proposes a FMCW laser ranging beat Signal frequency estimation method and system

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  • FMCW laser ranging beat signal frequency estimation method and system
  • FMCW laser ranging beat signal frequency estimation method and system
  • FMCW laser ranging beat signal frequency estimation method and system

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specific Embodiment approach 1

[0027] Specific embodiment one: this embodiment takes four-way beating signals as an example, a method for estimating the frequency of FMCW laser ranging beating signals, comprising the following steps ( figure 2 ):

[0028] Step 1, performing compressed sampling on the beat signal to obtain a sampled value matrix after compressed sampling ( image 3 ), including the following steps:

[0029] Step one one, the random sequence that produces 4 * 511 by Matlab is stored in the ROM inside FPGA, then by FPGA output 4 different pseudo-random sequences (P 1 (t), P 2 (t), P 3 (t), P 4 (t));

[0030] Steps 1 and 2, mixing the generated pseudo-random sequence:

[0031] Use 4-way four-quadrant analog multiplier to mix the pseudo-random sequence output by FPGA with the four-way beat signal, so that it can achieve the purpose of spreading in the frequency domain;

[0032] Step 13, low-pass filtering the beat signal processed in step 12:

[0033] The mixed signal is passed through ...

specific Embodiment approach 2

[0070] Specific embodiment two: a FMCW laser ranging beat signal frequency estimation system includes: a compressed sampling module and a frequency estimation module;

[0071] The frequency estimation module is used to implement the first embodiment;

[0072] The compressed sampling module is used to compress and sample the original beat signal, including: an analog circuit module, an analog-to-digital conversion module, a digital control module, a communication module, and a trigger circuit;

[0073] The analog circuit module is composed of 4 four-quadrant analog multipliers and an eighth-order active low-pass filter (H(s)), which are used to mix and intercept the beat signal and the pseudo-random sequence to achieve the beat The purpose of signal spreading and weighted superposition to baseband;

[0074] The analog-to-digital conversion module is used to collect the compressed beat signal processed by the analog circuit module at a low sampling rate and convert it into a di...

Embodiment

[0087] In practical application, the invention realizes the frequency estimation of the center frequency of the beat signal in the range of 0-40MHz, and the same compressed sampling of four hardware analog circuits. Wherein the number of symbols M=511 of the periodic pseudo-random sequence is set, and the system clock f of the periodic pseudo-random sequence is generated sys =80MHz, then the frequency of the periodic pseudo-random sequence is f p = f sys / M=156.556kHz, the cutoff frequency of the low-pass filter is f c = 3f p / 2=234.833kHz, the sampling rate f of each channel s ≥2f c = 469.667kHz, then the ADC rate of each channel is 500kHz to realize the compressed sampling of the beat signal from 0 to 40MHz, and then estimate the frequency of the original beat signal according to the compressed sampled beat signal to obtain the beat signal frequency . figure 1 The system block diagram of the frequency estimation of the beat signal generated by FMCW laser ranging is giv...

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Abstract

The invention discloses an FMCW laser ranging beat signal frequency estimation method and system, and belongs to the technical field of frequency modulated continuous wave laser ranging and compressed sampling. The invention aims to solve the problems of high sampling rate, low frequency calculation speed, large data processing calculation amount and low frequency resolution of an current beat signal frequency estimation method. The FMCW laser ranging beat signal frequency estimation system comprises a compressed sampling module and a frequency estimation module. The compression sampling module comprises an analog circuit module, an analog-to-digital conversion module, a digital control module, a communication module and a trigger circuit. The frequency estimation module executes the following steps: firstly, roughly measuring a beat signal to obtain a roughly measured signal frequency, then refining the compressed beat signal to obtain a refined beat signal frequency, and finally combining the roughly measured signal frequency with the refined signal frequency to obtain a final laser ranging beat signal accurate frequency. The method and system are used for acquiring the frequency of the beat signal.

Description

technical field [0001] The invention relates to the technical field of frequency modulation continuous wave laser ranging and compressed sampling, in particular to a method and system for estimating the frequency of an FMCW laser ranging beat signal. Background technique [0002] In recent years, due to the advantages of high automation and strong anti-interference, the chirp frequency-modulated continuous wave (FMCW) laser ranging technology has been widely used in aerospace, industry, military and other fields. In this technology, the frequency of the beat signal obtained by photoelectric conversion after the interference of the measurement light and the reference light has a linear relationship with the measurement distance. Therefore, whether the frequency information of the beat signal can be accurately obtained is the key to laser ranging. However, with the gradual expansion of the ranging range, the frequency of the beat signal is getting higher and higher, which brin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/34G01S7/4913
CPCG01S17/34G01S7/4913
Inventor 盖建新吴静谊薛宪峰南瑞祥
Owner 杭州国节能源技术有限公司
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