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

A laser radar, sampling point technology, applied in instruments, re-radiation of electromagnetic waves, radio wave measurement systems, etc., can solve the problems of many peripheral circuit structures and complex implementation methods, achieve flexible configuration of functions and interfaces, and concise implementation methods. Cost-effective effect

Active Publication Date: 2014-11-19
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

The disadvantage of this method is that there are many peripheral circuit structures (including FPGA, high-speed ADC

Method used

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

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Embodiment

[0030] Such as figure 1, The laser radar echo full waveform collector of the present invention includes a high-speed ADC sampling module, a high-speed FIFO buffer module, a high-speed coarse counter module, an interpolation delay chain module, a fine measurement coding module and a main control module. Except for the high-speed ADC sampling module, all other modules are implemented inside FPGA, and the FPGA chip chooses XC4VLX80 of XILINX Company.

[0031] The core of the ADC sampling module is a high-speed and high-precision sampling ADC, which uses the ADC12D800 of National Semiconductor Corporation (now incorporated into Texas Instruments), with a sampling bit width of 12 bits and a maximum sampling rate of 1.6Gsps. The invention adopts a highly stable 50MHz constant temperature crystal oscillator to generate a low-jitter 500MHz clock with a duty ratio of 50% as a sampling clock through an integrated phase-locked loop chip SY89421V, and the ADC works in a dual clock edge sa...

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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 ...

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Application Information

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IPC IPC(8): G01S7/493G01S17/88
CPCG01S7/4861G01S17/88
Inventor 郭颖舒嵘徐敏
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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