遗传算法在微弱GPS信号捕获方法中的应用  

Genetic Algorithm Application in Acquisition Method of Weak GPS Signals

作　　者：李春宇[1] 张晓林[1] 张超[1] 李宏伟[1] 

机构地区：[1]北京航空航天大学电子信息工程学院,北京100083

出　　处：《航空学报》2007年第6期1433-1437,共5页Acta Aeronautica et Astronautica Sinica

基　　金：国防科工委航天民口专项

摘　　要：研究了微弱GPS信号的捕获问题,以捕获时较低的虚警概率和较高的检测概率为目标,以累加时的粗捕获(C/A)码周期数和导航数据数,以及捕获门限等参数为决策变量,应用遗传算法(GA)来解决这一多目标优化问题。仿真结果表明,该方法能够有效地解决所提出的问题,所得解能够优化捕获时欲选取的参数,从而提高捕获性能。Acquisition methods of weak global positioning system （GPS） coarse/acquisition （C/A） signals are studied. In order to get lower false alarm probability and higher detection probability, the genetic algorithm （GA） is applied to solve this multipurpose optimal problem which has three parameters： the numbers of C/A code periods and navigation data bits which are used for integral, and the acquisition threshold. Simulation shows that the algorithm can solve the problem effectively, and the solution can optimize the parameters in acquisition process. Consequently, the acquisition performance is improved.

关 键 词：GPS接收机 捕获方法 遗传算法 微弱GPS信号 虚警概率 检测概率 

分 类 号：TN965.5[电子电信—信号与信息处理]