机载合成孔径激光雷达相位调制信号性能分析和成像处理

Performance Analysis and Image Processing of Phase-modulated Signal on Airborne Synthetic Aperture Ladar

该文将相位调制信号用于机载合成孔径激光雷达,分析了3种相位调制信号的性能,研究了相位调制信号的收发方式和成像处理方法。针对机载合成孔径激光雷达观测幅宽较小的特点,对基于线性调频信号的相位调制信号,提出采用"去调相"接收方式,以大幅度降低宽带信号的AD采样率。对3种相位调制信号所做的成像仿真结果表明了该方法的有效性。

In this study, the performance of three phase-modulated signals used in airborne Synthetic Aperture Ladar （SAL） is investigated. The transmitting and receiving modes and imaging processing methods for these signals are studied. Considering that the swath of the airborne SAL is very narrow, in order to reduce the AD sampling rate of the wideband signal, a “phase-dechirping” receiving mode is proposed for the phase-modulated signal based on the Linear Frequency Modulation （LFM） signal. The imaging simulation results for these three phase-modulated signals validate the effectiveness of the proposed method.