论文部分内容阅读
以频率跳变方式逼近任意的信号频率调制规律是设计复杂信号的有效方法。本文研究了在声信号检测中应用这种“脉内跳频信号”的一些基本问题。 首先,本文对脉内跳频信号的检测模糊度函数作了计算和分析,说明了信号频率量化所引起的检测模糊度函数的量化效应。接着指出,为了消除信号相位起伏对检测性能的影响,脉内跳频信号适宜于用“检波后匹配处理器”实现“最佳”处理。这种信号处理器的检测响应函数已经导出,并通过分析和“全相干检测器”的性能作了对比。最后,本文给出了一个“数控跳频信号源”的原理方案。其中,信号的跳频规律由指令装置按预定的数码控制,并且便于同“检波后匹配处理器”直接配合而组成完整的信号检测系统。
Approaching arbitrary signal frequency modulation with frequency hopping is an effective way to design complex signals. In this paper, we study some basic problems of using this “intra-frequency hopping signal” in acoustic signal detection. First of all, this paper calculates and analyzes the detection ambiguity function of the intra-frequency hopping signal, and illustrates the quantization effect of the detection ambiguity function caused by the signal frequency quantization. Then pointed out that in order to eliminate the signal phase fluctuations on the detection performance, the intra-frequency hopping signal is appropriate to use “post-detection matching processor” to achieve the “best” processing. The detection response function of this signal processor has been derived and compared with the performance of the “fully coherent detector” through analysis. Finally, this article gives a “numerical control frequency hopping signal source” principle scheme. Among them, the frequency hopping of the signal by the command device according to a predetermined digital control, and easy to match with the “match after detection processor” to form a complete signal detection system.