A pulsed laser system is considered for long-range target detection. Single-pulse power received from a target may be low compared to the noise and background clutter power. Due to long-range and short laser wavelength, multi-pulse coherent processing is not possible, so incoherent detection is employed. Incoherent pulse compression sums received power from numerous pulses to increase SNR while maintaining single pulse range resolution. Following Levanon, aperiodic burst waveforms of on–off Keying (OOK) modulated transmitted pulses are derived from binary codes with optimal auto-correlation minimum integrated sidelobe level and minimum peak sidelobe level codes. Pulse compression uses real, continuous mismatched filters of lengths equal to or greater than the OOK code length. Filter values minimize a weighted sum of ISL and filter output power, the latter to increase SNR gain relative to that of a single pulse. Weighting can be adjusted to lower ISL for multiple target discrimination or to increase SNR gain for dim targets. A simple evolutionary modulation of the initial OOK code exchanges pairs of dissimilar samples to keep the number of on samples from decreasing and improves ISL performance. A very fast filter calculation is employed that permits an exploration of a wide variation in parameters.

中文翻译：

---

激光雷达中非相干脉冲压缩的失配滤波器

考虑使用脉冲激光系统进行远程目标检测。与噪声和背景杂波功率相比，从目标接收的单脉冲功率可能较低。由于长距离和短激光波长，不可能进行多脉冲相干处理，因此采用了非相干检测。非相干脉冲压缩会将来自多个脉冲的接收功率相加，以提高SNR，同时保持单个脉冲范围的分辨率。继Levanon之后，开关键控（OOK）调制的发射脉冲是从具有最佳自相关最小积分旁瓣电平和最小峰值旁瓣电平代码的二进制代码中得出的。脉冲压缩使用长度等于或大于OOK代码长度的真实，连续失配的滤波器。滤波器值可将ISL和滤波器输出功率的加权和减至最小，后者可相对于单个脉冲增加SNR增益。可以调整权重以降低ISL用于多个目标的辨别力，或增加SNR增益以实现昏暗的目标。初始OOK代码的简单进化调制交换成对的不相似样本，以保持上减少样本数量并改善ISL性能。采用非常快速的滤波器计算，可以探索各种参数变化。