非相干累加中检波方式的性能分析与参数选取  

Performance Analysis and Parameters Selection of Detection Methods Based on Non-coherent Accumulation

作　　者：罗奎[1] 程剑[1] 李仰志[1] 赖广锋[1] 

机构地区：[1]解放军理工大学通信工程学院,南京210007

出　　处：《电讯技术》2011年第5期56-61,共6页Telecommunication Engineering

基　　金：国家高技术研究发展计划(863计划)项目(2008AA12Z307)~~

摘　　要：阐述了GNSS信号捕获过程中非相干能量累加的两种检波方式的实现原理,利用雷达检测理论对两者的性能进行了分析对比与数值计算,给出了两种检波方式的性能曲线。提出了两种相干累加时间与累加次数的选取方法并进行了仿真,该方法和仿真结果可作为GNSS系统信号捕获与跟踪过程方案设计的参考依据。仿真结果还表明,平方律检波方式相比于包络检波方式,在能量累加性能上要略差,差值在0.5 dB以内。Two detection methods in non-coherent energy accumulation in GNSS（Global Navigation Satellite System） signal acquisition process are discussed, the properties of which are analysed and compared by using radar detection theories, the performance curves of the two methods are plotted by Matlab. Two methods to chose coherent accumulation time and non-coherent accumulation times are proposed and simulated. The methods and simulation results can be used as a reference in GNSS design. The simulation results also show that the envelop detection performs better than square law detection on energy accumulation less than 0.5 dB.

关 键 词：GNSS 信号捕获 扩频 非相干累加 包络检波 平方律检波 

分 类 号：TN96[电子电信—信号与信息处理]