Novel laser ranging method and laser radar system

Abstract

The invention discloses a novel laser ranging method and a laser radar system. According to the novel laser ranging method, a laser pulse sequence is generated through electro-optical conversion to irradiate a target, and a laser pulse sequence reflected by the target is converted into an electric signal sequence by utilizing photoelectric conversion, wherein the responsivity of photoelectric conversion and time are changed in a cosine function relationship, and the change frequency of the responsivity of photoelectric conversion and time are changed in a linear relationship, so that the energy of each electric signal in the electric signal sequence is changed, the energy distribution of the electric signal sequence changes according to a certain rule, and the energy distribution change frequency of the electric signal sequence is calculated to obtain a target distance. The laser radar system is realized by adopting the novel laser ranging method. By applying the laser ranging method and the laser radar system, the problems that the laser radar system is low in resolution ratio, small in imaging distance range, poor in anti-interference capability and high in average power consumption and the performance is largely affected by the consistency and stability of optical response of an imaging detector can be solved.

Description

technical field [0001] The invention relates to the technical field of laser radar, in particular to a novel laser ranging method and a laser radar system. Background technique [0002] At present, ranging is mainly performed by emitting laser pulses with a narrow width but high peak power, and measuring the time of light flight back and forth between the pulsed light and the target. Some laser ranging methods calculate the target distance by extracting the rising edge, peak value, shape and other waveform information of the pulse signal, but when the signal-to-noise ratio of the pulse signal is low and the pulse shape is distorted, it will lead to large ranging errors and false alarms. Rate. Laser 3-D imaging radar system based on the above ranging method (see RogerStettner, Howard Bailey, Richard D. Richmod. Eye-Safe Laser Radar 3-D Imaging[J]. Proc. SPIE vol. 4377, pp23-28, 2005) Generally, a focal plane array integrated with an avalanche photodiode array and a readout ...

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Problems solved by technology

[0003] The content of the present invention is to solve the problem that the existing laser ranging method has a low signal-to-noise ratio and the pulse shape is distorted, the ranging error and the false alarm rate are greatly increased, and the existing laser radar system has low resolution and poor imaging performance. A new type of laser ranging method and laser radar system were invented to solve the problems of small distance range, poor anti-interference ability, high average power consumption, and the performance is affected by the consistency and stability of the optical response of the imaging detector.

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