这是GPS接收机，基带处理模块中累加模块设计代码，用于码跟踪环。代码设计巧妙，避免了消耗FPGA中比较稀缺的硬件乘法器资源。-This is the GPS receiver, Baseband Processing Module cumulative module design code for the code tracking loop. Code so cleverly designed to avoid the consumption of more FPGA hardware mul