【摘要】 为提高捕获速度且减小资源消耗,以"多段匹配滤波器+快速傅里叶变换(FFT)"架构为基础,提出并实现了一种新的适用于高动态下全球定位系统(GPS)P码直捕的时频二维并行搜索算法,其新颖性在于采用"折叠滤波器+重排序随机存取存储器(RAM)"结构实现了多段匹配滤波器,并在现场可编程门阵列(FPGA)中全并行地实现了捕获算法.采用流水线结构的硬件实现表明,新算法占用的资源约为原来的1/16.仿真结果和实际测试都表明,该算法在GPS高动态下能更快完成P码直捕.更多还原

【Abstract】 Based on the framework of "Multi-bank matched filter + FFT",a new acquisition algorithm is proposed and implemented to accelerate acquisition speed and decrease resources consumption,it is based on time and frequency domain parallel search and applicable to P code direct acquisition in global positioning system (GPS) high dynamic situation.Its advantage is multi-bank matched filter’s implementation in the structure of "folded filters + re-order RAM" and its field-programmable gate array(FPGA) implementation in parallel.The pipelined implementation shows that the new algorithm occupies about 1/16 of the old one.Simulation and field test show that the algorithm improves P code direct acquisition performance in GPS high dynamic situation.更多还原