Development of a Novel Wind Lidar. Phase 1

摘要

A prototype new incoherent Doppler lidar system was designed for atmospheric windmeasurements with a high accuracy up to a 5 kilometer slant path range in Phase 1. This sensor is based on the pseudo-random modulation cw lidar technique in conjunction with a new incoherent Doppler lidar method, in which the return PRM laser signal is passed through a Doppler filter before being digitally processed to determine range resolved wind velocity in real time. Extensive simulation study shows, in the baseline system configuration with a 50 cm receiver and one watt transmitter power, a 200 seconds signal integration will provide the required signal to noise ratio for a few percent accuracy measurement which corresponds to 1 m/s accuracy over a 50 m/sec dynamic range. Our Phase 1 experiment provided a unique technology basis for the construction of a high power narrow linewidth SLM diode laser system for cost effective and robust PRM laser transmitter. Consisting of the transmitter module, solid etalon based Doppler filter module, PRM data module and a receiver module, the sensor will be compact and lightweight with low power consumption and low cost. The sensor will be intrinsically insensitive to noise, background radiation, and other system bias. (AN).