擬似ランダム変調ライダーにおけるM系列信号処理

概要

論文の詳細を見る
Light detection and ranging, LIDAR, is a technique of remotely measuring distributions of the constitutions in the atmosphere. Usually, LIDAR uses pulse lasers with high energy as a light source. Since the laser equipments are, however, expensive and large-sized, the LIDAR techniques are not spreading well in the world as a measurement tool. Therefore the pseudo-random modulated continuous wave, RM-CW, LIDAR was proposed using a compact and cheap CW semi-conductor laser as a light source. In this research, the development of a RM-CW LIDAR for the measurement of the earth-warming molecules such as H_2O was planned. The laser was modulated using an acoustic-optical modulator, AOM. The AOM was modulated based on a maximum length sequence. Since the response of modulation speed is important, the rising time was improved up to 30ns in order to obtain the sampling time of 100ns. The LIDAR echo signals was analyzed. As result, it is shown that the LIDAR returns were successfully obtained although the laser power was very low.
2006-07-31