Moving object dynamic distance measurement method based on dual optical path frequency modulation continuous wave

A frequency-modulated continuous wave and distance measurement technology, applied in radio wave measurement systems, measurement devices, electromagnetic wave re-radiation, etc., can solve problems such as detection of low-speed targets that are not applicable, shorten data processing time, improve real-time performance, and algorithm easy effect

Inactive Publication Date: 2019-03-26
TIANJIN UNIV
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Problems solved by technology

Aiming at the range-Doppler coupling phenomenon that occurs in the frequency modulation continuous wave laser ranging technology when the object is moving, a relatively simple method is to use a triangular frequency sweep for the tunable laser, and make a difference between the frequency of the upper and lower frequency sweeps, thereby eliminating the range-Doppler coupling phenomenon. Le coupling phenomenon, but this method is not suitable for the detection of low-speed targets

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  • Moving object dynamic distance measurement method based on dual optical path frequency modulation continuous wave
  • Moving object dynamic distance measurement method based on dual optical path frequency modulation continuous wave
  • Moving object dynamic distance measurement method based on dual optical path frequency modulation continuous wave

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[0026] In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

[0027] The dual optical path FM continuous wave laser ranging device used in the present invention is as attached figure 2 As shown, it includes the tunable laser 1 and the first beam splitter 2 connected thereto. The frequency scanning signal output by the tunable laser 1 is divided into the E path and the F path by the first beam splitter 2, and the The E path enters the measurement interference system 8, the F path enters the auxiliary interference system 9, and the frequency of the tunable laser 1 is modulated by a triangular wave.

[0028] The measurement interference system 8 is used to detect the target to be measured and generate a measurement beat signal S1. The measurement interference system 8 includes a second beam splitter 3 co...

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Abstract

The invention discloses a moving object dynamic distance measurement method based on dual optical path frequency modulation continuous wave. A tunable laser is used to generate a frequency scanning signal. A measurement interference system generates a measurement beat frequency signal. An auxiliary interference system generates an auxiliary beat frequency signal. The auxiliary beat frequency signal is used to carry out equal optical frequency resampling on the measurement beat frequency signal to eliminate the influence of frequency modulation nonlinearity. The measurement beat frequency signal is processed to realize dynamic distance measurement of a moving object. According to the invention, adding other hardware is not needed; simply through a traditional dual optical path frequency modulation continuous wave laser ranging device, the influence of the Doppler effect on frequency modulation continuous wave laser ranging is eliminated; the measurement beat frequency signal after equaloptical frequency resampling is processed to realize dynamic distance measurement of the moving object; the hardware system of the method is simple, which reduces the cost of the hardware system; a software algorithm is simple, so that the data processing time is greatly shortened; and the instantaneity of object measurement is further improved.

Description

technical field [0001] The invention relates to the field of frequency-modulated continuous-wave laser radar, in particular to a method for measuring the dynamic distance of a moving object based on dual-optical-path frequency-modulated continuous waves. Background technique [0002] When measuring with a frequency-modulated continuous wave laser ranging device, the Doppler effect caused by the movement of the object will cause deviations in the measurement results, and the distance calculation value will amplify the movement displacement of the object by f 1 / B times, this multiple can usually reach hundreds or thousands, which has a great influence on the measurement. Aiming at the range-Doppler coupling phenomenon that occurs in the frequency modulation continuous wave laser ranging technology when the object is moving, a relatively simple method is to use a triangular frequency sweep for the tunable laser, and make a difference between the frequency of the upper and lowe...

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Application Information

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IPC IPC(8): G01S17/32
CPCG01S17/34
Inventor 张福民李雅婷曲兴华
Owner TIANJIN UNIV
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