Norman D M, Gardner C S
Appl Opt. 1988 Sep 1;27(17):3650-5. doi: 10.1364/AO.27.003650.
Techniques for satellite laser ranging have historically employed high-energy pulsed lasers as the optical transmitter. The output power currently available from laser diodes and laser diode arrays makes them a viable alternative to the pulsed laser for ranging applications. We examine the modulation of a laser diode by a pseudonoise code which produces a cw ranging signal with equivalent average power to that of current pulsed systems. A maximum-likelihood receiver for estimating signal arrival time using ideal rectangular pulses is shown to be a correlation receiver. A Uramer-Rao bound on the range error is derived for a ranging system with Gaussian code pulses and a correlation receiver. Ranging performance is evaluated for a single cubecorner retroreflector and a tilted flat diffuse target. It is shown that range accuracy of the order of 1 cm is feasible.
从历史上看，卫星激光测距技术一直使用高能量脉冲激光器作为光发射器。激光二极管和激光二极管阵列目前所能提供的输出功率，使其成为测距应用中脉冲激光器的一个可行替代方案。我们研究了用伪噪声码对激光二极管进行调制的情况，该伪噪声码产生一个连续波测距信号，其平均功率与当前脉冲系统的平均功率相当。使用理想矩形脉冲来估计信号到达时间的最大似然接收器被证明是一个相关接收器。对于具有高斯编码脉冲和相关接收器的测距系统，推导了距离误差的克拉美 - 罗界。对单个角锥棱镜后向反射器和倾斜的平面漫反射目标的测距性能进行了评估。结果表明，达到厘米级的测距精度是可行的。
