Laser ranging method and system

Abstract

The invention discloses a laser ranging method and system. Down conversion is carried out on a mixed electric signal and the frequency is reduced to be 0; and the signal after frequency reduction is sampled, wherein the sampling frequency is greater than the signal bandwidth. Therefore, the follow-up data processing capability can be greatly improved; the bit number of sampling is improved by being compared with that before down-conversion, thereby improving the signal-to-noise ratio of the system and increasing the working distance. The power consumption volume is reduced.

Description

technical field [0001] The invention relates to the technical field of laser detection, in particular to a laser distance measuring method and system. Background technique [0002] The principle of the pulsed laser ranging system is similar to the principle of microwave pulse radar ranging. Laser pulses are emitted to the target at the ranging point. After the laser pulses are sent to the target, a small part of the laser is reflected to the ranging point and received by the optical detector receiver. . Assuming that the target distance is R, the round-trip time of the laser pulse is t, and the speed of light propagation in the air is c, then the ranging formula is as follows: R=ct / 2. [0003] The existing pulse laser ranging method generally adopts the direct receiving method. The detector directly receiving the laser converts the light power irradiated on its photosensitive surface into a photocurrent or light power that changes with time, and determines whether there is...

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a laser ranging method and system to solve the problem in the prior art that it is difficult to directly process data on the mixed frequency signal in the case of coherent heterodyne reception

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