Full waveform acquisition circuit suitable for laser radar

Abstract

The invention is applicable to the field of laser radars and is to improve the sampling speed and effectively avoid walking errors. According to the the technical scheme provided by the invention, thefull waveform acquisition circuit suitable for a laser radar comprises three modules of a comparator, a delay module and a high speed sampling circuit. The output ends of the delay module and the comparator are connected with the control end of the high speed sampling circuit. A received pulse waveform voltage signal is simultaneously input into the comparator and the high speed sampling circuit.When the voltage signal is higher than a set threshold voltage signal Vref, the comparator output is a high level which is a trigger signal, wherein the trigger signal is used to trigger the delay module. The delay time can be controlled by a voltage control signal. The output signal of the delay module is transmitted to the high speed sampling circuit to stop sampling. The circuit provided by the invention is mainly used for the design and manufacturing of the laser radar.

Description

technical field [0001] The invention is applicable to the laser radar field, and can perform full waveform sampling while increasing the sampling speed and effectively avoiding walking errors. Background technique [0002] LiDAR technology is crucial to autonomous driving. It can perform 3D imaging and map mapping through accurate detection of distance information, and then realize target recognition, navigation and obstacle avoidance functions. Due to the above functions, lidar is also widely used in drones, robots, terrain mapping, agricultural production and other fields. The principle of vehicle lidar to achieve accurate ranging is time of flight (TOF). The process of TOF is that the laser emits a laser beam and starts timing at the same time. When the laser encounters an obstacle, it will be reflected on the surface of the obstacle. The reflected light is irradiated on the detector after passing through the receiving optics, and the timing is stopped when the detector ...

AI Technical Summary

Problems solved by technology

[0003] However, there are large errors in the existing technology, which requires high linearity of frequency modulation (chirp), which directly affects the accuracy of ranging; the current integrated frequency modulation method is not very mature (such as Strobe's frequency modulation laser based on WGM mode) , other frequency modulation methods (such as optical fiber, MEMS) have problems such as cost and volume that need to be solved

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