Coherent laser radar signal processing method based on GPU

A laser radar and signal processing technology, applied in the direction of re-radiation of electromagnetic waves, utilization of re-radiation, measurement devices, etc., can solve the problems of echo signal power spectrum broadening, expensive DSP and FPGA chips, complex circuit structure, etc. ability, the effect of reducing development difficulty and cost

Active Publication Date: 2018-08-24
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

With the computing power of 160G floating-point per second of TI's high-end DSP chip TMS320C6678, 8 parallel chips are needed to meet the computing requirements; currently the highest performance FPGA computing power is in the same order of magnitude as TMS320C6678, so the programming of coherent receivers is difficult, and the circuit complex structure
[0005] (2) The DSP and FPGA chips of the TMS320C6678 model are very expensive, and the sing

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[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0021] In 2007, NVIDIA Corporation launched the Unified Computing Device Architecture (CUDA), which turns the graphics card (GPU) into a device that can be used for data parallel computing. After nearly 10 years of development, CUDA technology has been commercialized on a large scale, fully compatible with common programming languages ​​such as C / C++, with advanced and complete software development tools and environments, and GPUs are widely used in...

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Abstract

The present invention discloses a coherent laser radar signal processing method based on a GPU. Based on a CUDA (Compute Unified Device Architecture) algorithm of the NVIDIA Corporation, the method employs GPU (Graphic Processing Unit) parallel computation to replace FPGA or DSP operation in a traditional coherent wind lidar, and the CPU is employed to perform storage and further processing of a power spectrum output by the GPU. Compared to a traditional coherent wind lidar, the GPU computation is faster in speed and lower in cost, can achieve real-time wind speed inversion or real-time time-frequency conversion. The power spectrum data is stored to conveniently perform further processing of the data by employing other algorithms to extract more useful information such as atmospheric visibility, an atmospheric depolarization ratio and the like.

Description

technical field [0001] The invention relates to the technical field of laser radar, in particular to a GPU-based coherent laser radar signal processing method. Background technique [0002] Accurate atmospheric wind field measurement is of great significance for detecting atmospheric pollution, obtaining military environmental intelligence, improving aerospace safety, improving the accuracy of weather forecasts, and improving climate models. Wind lidar is an effective means of wind field measurement, which can be divided into direct detection wind lidar and coherent detection wind lidar. The direct detection wind measurement lidar uses an optical discriminator to convert the Doppler frequency shift information into the relative change of energy, and realizes the measurement of the atmospheric wind field; the coherent detection wind measurement lidar uses the coherence between the atmospheric echo signal and the local oscillator laser The beat frequency realizes the measurem...

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Application Information

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IPC IPC(8): G01S17/95
CPCG01S17/95Y02A90/10
Inventor 王冲吴云斌夏海云窦贤康
Owner UNIV OF SCI & TECH OF CHINA
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