A method and system for estimating the beat signal frequency of fmcw laser ranging

A beat signal and laser ranging technology, which is applied to radio wave measurement systems, measuring devices, instruments, etc., can solve the problems of large amount of data processing calculations, slow frequency resolution speed, low frequency resolution, etc., to improve the frequency The effects of solving speed, improving frequency resolution, and reducing data processing amount

Active Publication Date: 2022-05-27
杭州国节能源技术有限公司
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  • Claims
  • Application Information

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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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  • A method and system for estimating the beat signal frequency of fmcw laser ranging
  • A method and system for estimating the beat signal frequency of fmcw laser ranging
  • A method and system for estimating the beat signal frequency of fmcw laser ranging

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specific Embodiment approach 1

[0027] Embodiment 1: This embodiment takes four-channel beat signals as an example, a method for estimating the frequency of FMCW laser ranging beat signals, including the following steps ( figure 2 ):

[0028] Step 1: Compressed sampling is performed on the beat signal to obtain a sampling value matrix after compression sampling ( image 3 ), including the following steps:

[0029] Step 11. The 4×511 random sequence generated by Matlab is stored in the ROM inside the FPGA, and then 4 different pseudo-random sequences are output by the FPGA (P 1 (t), P 2 (t), P 3 (t), P 4 (t));

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

[0031] Using 4-channel four-quadrant analog multipliers to mix the pseudo-random sequence output by the FPGA with the four-channel beat signal to achieve the purpose of spreading in the frequency domain;

[0032] Step 13: Perform low-pass filtering on the beat signal processed in Steps 1 and 2:

[0033] The mixed signal passes ...

specific Embodiment approach 2

[0070] Embodiment 2: An 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 for implementing the first embodiment;

[0072] The compression 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 four-way four-quadrant analog multipliers and an eighth-order active low-pass filter (H(s)), which is used to mix and intercept the beat signal and the pseudo-random sequence, so as to achieve the The purpose of signal spread spectrum and weighted superposition to baseband;

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

Embodiment

[0087] In practical application, the present invention realizes the frequency estimation of the center frequency of the beat signal in the range of 0-40 MHz, and the same compression sampling of 4 channels of hardware analog circuits. Among them, the number of symbols of the periodic pseudo-random sequence is set to M=511, 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 can realize the compressed sampling of the beat signal of 0-40MHz at 500kHz, and then estimate the frequency of the original beat signal according to the compressed and sampled beat signal to obtain the frequency of the beat signal . figure 1 The system block diagram of the frequency estimation of the beat signal gener...

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Abstract

A method and system for estimating the beat signal frequency of an FMCW laser rangefinder, relating to the technical fields of frequency modulation continuous wave laser rangefinder and compressed sampling. The present invention aims to solve the problems of high sampling rate, slow frequency solution speed, large amount of calculation for data processing and low frequency resolution in the current beat signal frequency estimation method. A FMCW laser ranging beat signal frequency estimation system includes: a compressed sampling module and a frequency estimation module; the compressed sampling module includes: 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 steps are as follows: firstly perform rough measurement on the beat signal to obtain the rough signal frequency, then refine the compressed beat signal to obtain the refined beat signal frequency, and finally combine the rough measurement signal frequency with the refined signal frequency That is, the precise frequency of the final laser ranging beat signal is obtained. The present invention is used to obtain 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 compression sampling, in particular to a method and system for estimating the frequency of a beat signal of FMCW laser ranging. Background technique [0002] In recent years, the frequency modulation continuous wave (FMCW) laser ranging technology has the advantages of high automation and strong anti-interference, which makes it widely used in aerospace, industry, military and other fields. In this technology, after the interference of the measurement light and the reference light, the frequency of the beat signal obtained by photoelectric conversion 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 br...

Claims

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Application Information

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Patent Type & Authority Patents(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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