摘要
导航信号质量监测平台由全向天线及高增益接收天线单元、监测接收机、下变频器、信号采集存储设备和PC信号质量分析软件组成,实现了在轨卫星的数据层长期评估和信号层精细分析。利用导航信号质量监测平台,对北斗、GPS、GLONASS等卫星信号的时域、频域、调制域、相关域、测量域等质量进行了评估,并对码减载波、码相位相干性和信号相关峰等关键指标进行了具体分析与比较。结果表明:目前北斗系统在轨信号质量与GPS信号质量相当,略优于GLONASS信号质量。
The navigation signal quality analysis platform is consist of omnidirectional high-gain directional antennas, monitoring receiver , down converter, signal record ~ play- back system, and analysis software. This system combines long-term evaluation in data layer and comprehensive parameters analysis in quality layer. The paper is based on the signal quality platform, which analyze the signals of BDS.GPS and GLONASS in time-domain, fre- quency domain, modulation domain, correlation domain and measurement domain. Then, the key and difficult abnormality monitoring indicators are specifically discussed and corn pared, including code minus carrier, the code phase coherence and signal correlation peaks. Finally, the comparison results between GNSS show that： the present BDS signal quality is equivalent with GPS, slightly better than GLONASS.
出处
《全球定位系统》
2013年第4期32-37,共6页
Gnss World of China
关键词
在轨信号评估
全球导航卫星系统
信号质量
In-orbit test
global navigation satellite system （GNSS）
signal quality
