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GNSS系统中预积分时间内基带信号的功率谱密度研究
黄旭方,陈静开,覃新贤
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(广西大学计算机与电子信息学院，南宁 530004)

摘要:

目前在进行全球卫星导航无线频率兼容性评估时，由于忽略了接收端预积分时间对基带信号截断作用的事实，导致采用的短码功率谱密度计算方法有误，这将影响到评估结果的精确性。针对这个问题，分预积分时间大于等于和小于伪码周期两种情况，对基带信号的功率谱解析式进行推导，然后仿真不同预积分时间内实际信号的功率谱以及解析式的功率谱，比较这两者的谱分离系数。仿真结果表明，预积分时间对短码的谱分离系数影响很大，这正确反映了预积分时间对功率谱密度的影响。该功率谱解析式有助于精确估计无线射频干扰。

关键词: 全球卫星导航系统射频兼容性预积分时间功率谱密度基带信号

DOI：

基金项目:国家自然科学基金资助项目(61004123)；广西自然科学基金资助项目（2011GXNSFA018155）；广西大学科研基金资助项目(XB2090844)

GNSS baseband signal power spectrum in pre-integration time

HUANG Xu-fang,CHEN Jing-kai,QIN Xin-xian

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Abstract:

The correct analysis of power spectrum density is very critical when assessing t he radio frequency compatibility. Among a number of papers on this research, how ever,the fact that preintegration time in time domain is equivalent to the pro duct of rectangular window multiplied by PRN code is ignored, and some present a ssessment results with deviation. The above problems, instead, are given close a ttention by this paper. This paper firstly presents the detail derivation proces s in two cases. In the first case preintegration time is greater than or equal to the pseudocode period and in the second case the preintegration time is less than the pseudorandom code period.And then the real power spectrum and the analytical power spectrum are compared in different pseudocode period to verif y the correctness of derivation results.It is concluded that the derivation resu lts are proved to be correct, and the preintegration time should be regarded a s an important parameter of short code when accurate assessing the radio frequen cy compatibility.

Key words: global navigation satellite system RF compatibility pre-integration time power spectrum density baseband signal