Laser radar echo full-waveform acquisition device with sampling point time location

Abstract

The invention discloses a laser radar echo full-waveform acquisition device with sampling point time location, and belongs to the technical field of earth observation laser radar remote sensing. The full-waveform acquisition device comprises a main control module, a high-speed ADC sampling module, a high-speed FIFO cache module, an interpolation delay line module, a high-speed coarse counter module, and a fine measurement coding module. All the modules except the high-speed ADC sampling module are implemented inside an FPGA. The invention aims to provide a laser radar echo full-waveform acquisition device for acquiring sampling point time location by a simple method. A frequency division clock synchronous with a high-speed ADC sampling clock is used as a rough counting clock, echo sampling point data is stored in a certain time interval under control, and the time interval between a main wave pulse and a coarse counting clock edge is finely measured by use of an interpolation delay chain, thereby obtaining an echo sampling point which has precise time location relative to laser transmitting main wave pulse. The laser radar echo full-waveform acquisition device with sampling point time location has the advantages of simple peripheral circuit, concise means of realization, flexible function interface configuration, and high cost performance.

Description

technical field [0001] The invention belongs to the field of earth observation laser radar remote sensing technology, and specifically refers to a laser radar echo full waveform collector with the function of sampling point time positioning. Background technique [0002] The earth observation lidar system is an active optical remote sensing system used in space-based platforms such as aircraft and satellites, which can accurately and quickly obtain three-dimensional space information on the ground and ground targets. Compared with other remote sensing technologies, lidar technology has technical advantages such as low production cost, high degree of automation, little influence from weather, short data production cycle, and high measurement accuracy. In addition, because the laser pulse can partially penetrate the forest shelter and directly obtain the high-precision 3D terrain information of the real ground, it has the superiority that cannot be replaced by the traditional ...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that there are many peripheral circuit structures (including FPGA, high-speed ADC chip, high-precision TDC chip and time stretching circuit) and the implementation method is relatively complicated.

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