Research On High-resolution And Multi-channel Information Acquisition Of Airborne Laser Radar

Laser radar has different imaging mechanism with passive optical remotesensing, and strong ability to detect the spatial structure of vegetation andtopography. Meanwhile, the high-resolution time interval measurement techniquesplay a crucial role both in the field of telecommunications and aerospace defense.SITP carries out research on miniaturized airborne laser radar in cooperation with themunicipal government of Jiaxing. This paper does research on detection technologyof airborne laser radar based on this project. A system for high-resolution andmulti-channel information acquisition is set up, providing a technical basis forquantitative measurement and inversion of forest parameters and city laser remotesensing applications.This paper designed detection circuit of laser according to the overall airbornelaser radar system framework. Then time measurement system for laser radarachieved through FPGA directly designed with Constant-fraction Discriminator(CFD) is proposed, which is based on interpolation and tapped delay line method.After experiments in laboratory, the system is verified that it has a high resolutionand multi-channel measurement capability, whose measuring accuracy reaches thelevel of60to80ps, almost the same as single-channel measurement system at homeand abroad. What’s more, the system can achieve up to50-way multi-channel timeinterval measurement with a high degree of integration. Therefore it has broadapplication prospects.