核脉冲信号的数字余弦函数（cos）成形，因成形简单、可操作性强和灵活性高等优势被用于核脉冲信号的数字成形处理中。本文从单指数衰减脉冲信号和cos脉冲信号的数学模型出发，推导了对称cos成形、零面积cos成形与对称零面积cos成形三种成形方法在Z域中的传递函数和级联公式，分析了成形参数对数字cos成形结果的影响。针对仿真核信号和实际采样核信号，分别实现了三种数字cos成形；基于现场可编程逻辑门阵列（Field Programmable Gate Array，FPGA）系统，实现了核信号的数字cos成形、幅度提取、能谱构建等功能。通过对¹³⁷Cs（NaI（Tl）探测器）γ能谱的测试，结果表明三种数字cos成形方法在能量分辨率和计数方面均表现良好，且对称零面积cos成形性能指标更为优异，具有较大的应用前景。

Aiming at coherence degradation during target detection, a suppressing method based on frequency-modulated continuous wave coherent lidar is proposed. Combined with a random iteration algorithm, a long-pulse echo signal with coherent degradation is matched with random phase noise of a certain frequency and achieves coherence restoration. Simulation and field experiment results show that this proposed method can recover the intrapulse coherence in long-pulse echo signals. In addition, for the real target echo signal at 4.2 and 19.8 km, the peak signal-to-noise ratio processed by this method is increased by 0.35 times and 4 times after pulse compression, respectively.

提出了一种主动锁模光电振荡器（OEO）方案，可以实现高阶谐波锁模，从而产生具有高重复频率的微波脉冲信号。在所提方案中，通过在OEO腔内的电光强度调制器直流偏置端口引入一个正弦驱动信号，当该正弦信号的频率 ${f_{bias}}$为OEO环腔自由光谱范围的整数倍 $N$时，实现基频（ $N = 1$）或谐波（ $N \geqslant 2$）锁模，输出重复频率为 ${f_{bias}}$的微波脉冲信号。实验中分别实现了10阶、50阶和100阶谐波锁模，输出微波脉冲信号的重复频率分别为360 kHz、1.8 MHz和3.6 MHz。该方案为脉冲多普勒雷达等系统应用提供了一种全新的、具备低相噪潜力的微波脉冲信号产生的技术途径。