摘要
研究如何使扩展频谱系统接收机的伪随机序列捕获时间最小 .扩频信号传播过程中由于多径效应、多普勒效应以及接收机的时钟不稳定性产生一个时频不稳区 ,接收机必须在此区域内搜索伪随机序列的同步相位 .为了减少捕获时间 ,在接收机中将伪随机序列分成一系列的短段落 ,利用码匹配滤波器 (CMF)在每个短段落里分别计算互相关 ,然后将这些互相关值累加和参考门限比较 ,在以上计算基础上同时讨论了跟踪与数据中继卫星系统中扩频接收机使用CMF技术的扩频序列捕获性能 ,只要将输出SNR限制在一定范围内 。
Discusses the acquisition performance of TDRSS receiver with CMF(Code Matched Filter) used to acquire the minimum acquisition time. Spread spectrum communication system utilizes the spread spectrum waveforms to extend the spectrum. In order to accomplish demodulation, the phase of the local spread spectrum waveforms must coincide completely with that of the received signals. In the transmitting process, it is due to the multipath effects, doppler loss and the clock uncertainty of receiver that produce a time and frequency region, where receiver is subject to search the desired signals. How to minimize the acquisition time is an important factor to determine the receiver performance.
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2000年第6期103-105,110,共4页
Journal of Harbin Institute of Technology
