The modulated sampling scheme can intercept noncooperative signals distributed in a wide frequency band by using a single receiving channel, which is an efficient architecture in many radar and communication applications. The modulated sampling scheme employs a non-uniform sample pulse train to fold the intercepted signal prior to quantization/digitization by using a local oscillator (LO) that contains a certain modulation type. Since the mono-pulse radar signals are widely used in many radar systems, the modulated sampling scheme will receive the multiple mono-pulse radar signals simultaneously in dense signal environment, and the folded outputs of the modulated sampling scheme may meet frequency aliasing. Thus, it is necessary to investigate the reconstruction of the multiple mono-pulse signals intercepted by the modulated sampling scheme in the frequency aliasing situation. In this paper, based on the orthogonal matching pursuit algorithm, the LO modulation type of the modulated sampling scheme is analyzed to achieve a better reconstruction performance of the multiple mono-pulse signals. The drawback of the typical LO using sinusoidal frequency modulation to reconstruct multiple mono-pulse signals is investigated firstly. Then, an improved LO using periodic linear frequency modulation is proposed, and its effectiveness to reconstruct multiple mono-pulse signals is analyzed. Furthermore, the parameter setting criterion of the improved LO modulation is given, and the comparison using other modulation types is discussed. Finally, several simulations are conducted to prove our analysis and the improved LO modulation can reconstruct multiple mono-pulse signals under the frequency aliasing condition.

调制采样方案可以通过使用单个接收通道拦截分布在宽频带中的非合作信号，这是许多雷达和通信应用中的有效架构。调制采样方案采用非均匀采样脉冲序列，通过使用包含特定调制类型的本地振荡器 (LO) 在量化/数字化之前折叠截获的信号。由于单脉冲雷达信号广泛应用于许多雷达系统中，调制采样方案在密集信号环境下会同时接收多个单脉冲雷达信号，调制采样方案的折叠输出可能会遇到频率混叠。因此，有必要研究调制采样方案在频率混叠情况下截获的多个单脉冲信号的重构。本文基于正交匹配追踪算法，对调制采样方案的本振调制类型进行分析，以达到更好的多单脉冲信号重构性能。首先研究了使用正弦频率调制重构多个单脉冲信号的典型本振的缺点。然后，提出了一种使用周期性线性调频的改进本振，并分析了其重构多单脉冲信号的有效性。此外，给出了改进本振调制的参数设置准则，并讨论了与其他调制类型的比较。最后，