摘要
介绍了PAM伪随机码的构成原理,推导了PAM伪随机码的自相关函数和功率谱密度,结合图形分析了它们的性质特点。设计了伪码调相与PAM复合测距系统,并分析了在加性高斯白噪声信道中的各个阶段的信号形式。研究了复合测距系统的性能,详细推导了复合测距系统的信噪比增益。结果表明,与单纯的伪码测距系统相比,复合测距系统有更强的抗干扰性能和测距能力。
The principle of PAM pseudonoise code is introduced, and its autocorrelation function and power spectrum are deduced in detail. Furthermore, their characters are analyzed on the basis of their figures. Thereafter, combined ranging system is designed, and the formula of signals in every aspects over an additive white Gaussian noise channel is deduced. At last, the performance of combined ranging system is researched, and the SNR gain is deduced in detail. The results show that combined ranging system has stronger performance of ECCM and better capacity of ranging than usual PN ranging systems.
出处
《宇航学报》
EI
CAS
CSCD
北大核心
2004年第2期152-157,共6页
Journal of Astronautics
基金
国防"十五"重点预研项目(No.413050305)
关键词
伪随机码
PAM
测距
自相关函数
功率谱
抗噪声
Pseudonoise
Pulse amplitude modulation
Ranging
Autocorrelation function
Power spectrum
Antinoise
