基于包络信息的BPSK信号与侦收信道带宽定量关系分析

Quantitative Relationship Analysis between Collection Channel Bandwidth and BPSK Signal Based on Envelope Information

针对二相编码信号经过数字信道化接收机会产生包络缺口现象,通过改变了信号与接收机相关参数,发现对包络缺口个数正确估计的条件要强于对脉宽的估计,且位于信道边沿的信号不能保证包络缺口个数的正确估计。该研究以包络缺口个数与二相编码相位跳变点相等,脉宽估计相对误差小于10%作为正确接收的条件,得到了信号带宽与信道带宽之间的定量关系:当信号载频与信道中心的距离不大于信道带宽的44.4%时,可正确接收的信号带宽为信道带宽的0.493;当距离不大于信道带宽的37.2%时,可正确接收的信号带宽增大至信道带宽的0.704;该结果对不同的编码方式依然成立。

After digital channelized receivers, binary phase shift keying（BPSK） signal would produce envelope gap. With this phenomenon, estimating the number of envelope gaps need more conditions than estimating the pulse width, and signals on the edge of channel unable to ensure that the number of envelope gap estimation results are correct. This research based on the condition that the number of envelope gaps are equal to the phase jump points, and correct received condition is relative error of the bandwidth estimation less than 10%, we find the quantitative relationship between signal bandwidth and channel bandwidth： if signal carrier frequency distances from the center of channel is no more than 44.4 % of channel bandwidth, the correctly received signal band-width is 0.439 times of the channel bandwidth; if distance no more than 37.2 %, the correctly received signal bandwidth is 0. 704 times of the channel bandwidth, also this approach to other encoding method remains valid.