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针对利用干扰系数计算系统内干扰时,用码片的功率谱代替导航信号功率谱的探讨,提出以干扰系数随多普勒频偏的波动范围大于2 dB为短码的界定指标,若导航信号的数据速率小于码速率除以码长,则界定为短码,否则视为长码.当信号为长码时才可用码片的功率谱代替导航信号的功率谱.以美国的全球定位系统(GPS)L1频段上的C/A码为例,对短码受到的系统内干扰进行了分析.
Aiming at the problem of calculating the interference in the system by using the interference coefficient and substituting the power spectrum of the chip for the power spectrum of the navigation signal, the definition of the interference coefficient with Doppler frequency deviation larger than 2 dB as the short code is proposed. If the navigation signal Of the data rate is less than the code rate divided by the code length, then defined as a short code, otherwise as a long code.When the signal is a long code chip power spectrum can be used instead of the navigation signal power spectrum.United States Global Positioning System GPS) L1 frequency band C / A yard as an example, the short code receives the system interference to carry on the analysis.