机载多脉冲激光雷达目标信号模拟器的研究

研究多脉冲激光雷达目标信号模拟器,用以评估回波数字信号处理算法及其实现平台的性能。结合信号能量与波形关系指出由激光雷达方程建立回波信号波形模型是不充分的。对空中目标回波脉冲展宽进行建模及数值仿真,得到不同倾角、目标距离及目标尺寸下的波形展宽时间数据。根据展宽前后能量保持不变的性质,利用高斯脉冲函数特征参数求解建立回波波形数学模型。基于目标距离误差及目标回波噪声统计特性建立回波仿真模型,提出了依信噪比发生回波观测信号的方法。对比两种模拟器的信噪比误差、最小模拟信噪比、连续工作时间等性能指标,总结了新型模拟器的优势。

Study on Airborne Multi-Pulse Ladar Target Signal Simulator

Airborne multi-pulse ladar target signal simulator is studied to evaluate the performance of echo signal digital processing algorithms and hardware platform. It is pointed out that only using radar equation to establish the echo waveform model is inadequate for the relationship between waveform and energy. Air target echo pulse broadening is analyzed, and the waveform time broadening data are acquired under different angles, target distances and target sizes. Because the energy remains same before and after broadening, the echo waveform mathematic model is established through solving the characteristic parameters of Gaussian pulse function. Then the simulation model based on target distance error and echo pulse waveform error statistic characteristics is given, and the method to generate echo signal according to the signal-to-noise ratio (SNR) is proposed based on the standardization of echo noise root mean square (RMS) value. The performances about echo SNR error, minimum output SNR, and continuous working time of two laser simulators are compared.