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数据字长对GPS接收机性能和硬件资源消耗有着重要影响,以循环相关捕获算法为例,利用线性方法建立GPS接收机各部分量化误差模型,讨论算法实现中各模块数据字长对信噪比的影响,给出了误差表达式,确定了系统性能与资源消耗的最优结合点。软件接收机仿真测试结果表明,该方法分析结果正确有效,能够为捕获跟踪电路的FPGA实现提供工程设计参考。
Data word length has an important influence on the GPS receiver performance and hardware resource consumption. Taking the cyclic correlation acquisition algorithm as an example, a linear method is used to establish the quantization error model of each part of the GPS receiver. The data length of each module in the algorithm is discussed. The error expression is given and the optimal combination of system performance and resource consumption is determined. Software receiver simulation test results show that the method is correct and effective analysis of the results, can capture tracking circuit FPGA implementation to provide engineering reference.