Signal processing system based on FPGA laser tachymeter and method

A laser velocimeter and signal processing technology, which is applied in the direction of radio wave measurement systems, instruments, measurement devices, etc., can solve the problems of small measurement range, time-consuming, and decreased data reliability, so as to achieve stable data transmission and save storage Data time, effect of reducing signal processing time

Inactive Publication Date: 2016-01-27
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a signal processing system and method based on an FPGA laser velocimeter, aiming at solving the problem of collecting and processing data in the traditional way of combining FPGA and DSP. narrower problems

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  • Signal processing system based on FPGA laser tachymeter and method
  • Signal processing system based on FPGA laser tachymeter and method
  • Signal processing system based on FPGA laser tachymeter and method

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[0054] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0055] The speed measurement range of the laser velocimeter applicable to the present invention is 0.16m / s~6.1m / s, and the range ratio reaches 38:1 (the range ratio is the ratio of the maximum measured value to the minimum measured value), and the speed range is the same as that of the 532nm wavelength The Doppler frequency range corresponding to laser coordination is 0.6MHz to 23MHz, and the scale factor is 2.66×10 -3 . Frequency measurement accuracy The measurement accuracy is less than or better than 8×10 -4 , the measurement stability is better than 2.5×10 -7 , the data processing delay is less than 1230us, and the d...

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Abstract

The invention discloses a signal processing system based on an FPGA laser tachymeter and a method. After power is on, FPGA sends a sampling clock to an AD sampling module. After FPGA receives data sampled by AD, the data are processed in real time. A processing result is transmitted to a PC for storage and display through USB. According to the invention, data flow between two core chips is eliminated; the data processing time can be effectively reduced; the chance of exposing the data to the outside world is reduced; the anti-jamming capability of the data is increased; a lot of time to store the data can be saved; the signal processing time is reduced to the greatest extent; the data processing delay is reduced; the timeliness is improved; the system and the method are adaptive to signals in different frequency bands, and take into account the measurement accuracy and measurement range; and a USB transmission mode is used, so that data transmission is stable.

Description

technical field [0001] The invention belongs to the technical field of real-time Doppler signal processing, and in particular relates to a signal processing system and method based on an FPGA laser velocimeter. Background technique [0002] The laser speedometer uses the Doppler frequency shift generated by the relative displacement between the laser source and the target to detect the speed information of the target. Compared with the traditional sonic velocity measurement and microwave velocity measurement, the laser velocimeter has the advantages of short working wavelength, small divergence angle, high precision, high linearity, and fast dynamic response. When the laser is irradiated on the moving object, the light scattered by the moving object will have an offset in frequency relative to the incident light, that is, the Doppler frequency shift. This frequency shift carries the speed information of the moving object. Whether the frequency shift can be measured accurate...

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Application Information

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IPC IPC(8): G01S17/58G01S7/491
CPCG01S7/4912G01S7/4913G01S17/58
Inventor 梁文强周健聂晓明樊振方何鑫
Owner NAT UNIV OF DEFENSE TECH
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