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Frequency-modulated continuous wave laser radar ranging method based on double heterodyne mixing

A frequency-modulated continuous wave and laser radar technology, applied in the field of microwave photonics, can solve the problems of cumbersome process, unsatisfactory effect, and high cost, and achieve the effect of expanding the frequency sweep range, good scalability, and improving linearity

Active Publication Date: 2020-06-16
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0005] In view of this, the present invention provides a frequency-modulated continuous-wave laser radar ranging method based on double heterodyne mixing, which obtains an optical frequency comb through electro-optic modulation, and eliminates the laser frequency comb according to the coherence relationship between the frequency components of the optical frequency comb. At the same time, it can expand the scanning range of the laser, improve the linearity of the scanning frequency, and solve the problems of cumbersome process, high cost and unsatisfactory effect of the existing method for improving the ranging accuracy of FM continuous wave lidar

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  • Frequency-modulated continuous wave laser radar ranging method based on double heterodyne mixing

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[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0029] See attached figure 1 , the embodiment of the present invention discloses a frequency modulation continuous wave laser radar ranging method based on double heterodyne mixing, the method comprising:

[0030] S1. Modulate the linear frequency sweep radio frequency signal to the laser signal output by the laser through a phase modulator to generate an optical frequency comb, which is divided into a probe light and a reference light after passing through a ...

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Abstract

The invention discloses a frequency-modulated continuous wave laser radar ranging method based on double heterodyne mixing. According to the method, complex laser feedback control is not needed; implementation cost is effectively reduced, phase noise of the laser is counteracted in a beat frequency mode, good expansibility is achieved, the frequency sweeping range can be doubled by increasing thenumber of cascaded phase modulators, accordingly, the frequency sweeping range of the laser is expanded, the linearity of frequency sweeping is improved, and the ranging result obtained through the method is higher in precision and higher in practicability. The problems that an existing method for improving the ranging precision of the frequency-modulated continuous wave laser radar is complex inprocess, high in cost and not ideal in effect are solved.

Description

technical field [0001] The invention relates to the technical field of microwave photonics, and more specifically relates to a frequency-modulated continuous-wave laser radar ranging method based on double heterodyne frequency mixing. Background technique [0002] At present, lidar is widely used in the field of high-precision ranging because of its use of optical signals with shorter wavelengths, good orientation, high spatial resolution, strong anti-interference ability, small size, and light weight. Laser radar can be divided into pulse laser radar and continuous wave laser radar, and continuous wave laser radar can be divided into phase laser radar and frequency modulation continuous wave laser radar. Due to the fuzzy distance in the ranging method used by the phase laser radar, the measurement accuracy is difficult to guarantee, and it has not been widely used. The FM continuous wave laser radar adopts the absolute ranging method, which has high ranging accuracy, large...

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Application Information

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IPC IPC(8): G01S17/34
Inventor 蒲明龙谢玮霖董毅
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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