计算机科学 ›› 2013, Vol. 40 ›› Issue (8): 46-48.
李卫斌,张迎新,尚保卫,马宪民
LI Wei-bin,ZHANG Ying-xin,SHANG Bao-wei and MA Xian-min
摘要: 微弱GPS卫星信号的捕获需要长的相干积分时间,同时还要克服导航数据位跳变的影响,传统算法很难同时兼顾捕获的灵敏度和实时性这两个方面。提出了一种基于位跳变检测的微弱信号快速捕获算法,该算法通过比较多组数据的相干积分结果估计出第一个跳变位,并将其余间隔20ms的数据均记为跳变位进行剔除,而对其余数据进行19ms的分块相干积分。仿真结果表明,该算法通过对140ms数据的积分运算能够高效地捕获到信噪比低至-47dB的信号,可有效提高GPS接收机的灵敏度和实时性。
[1] 林庆恩,茅旭初.一种用于微弱GPS信号处理的快速捕获方法[J].计算机仿真,2010,7(10):330-334 [2] 黎山,易清明,陈庆,等.适用于GPS软件接收机的弱信号捕获方法[J].计算机应用,2012,2(3):816-822 [3] Ba Xiao-hui,et al.A novel algorithm based on FFT for ultrahigh-sensitivity GPS Tracking[C]∥IONGNSS2009.Savannah,2009:339-345 [4] Mohammadreza Z,et al.Enhanced GNSS indoor signal detecta-bility using polarization diversity[C]∥IONGNSS 2009.Savannah,2009:395-205 [5] Cai Y,et al.Using network RTK corrections and low-cost receiver for precise mass market positioning and navigation applications[C]∥IEEE Intelligent Vehicles Symposium.Baden-Baden,2011:345-349 [6] Hu Cong-wei,el al.Assisted GPS positioning under weak signal environments[C]∥ION GNSS 2009.Savannah,2009:3102-3109 [7] Wu Ling-juan,Lu Wei-jun,Yu Dun-shan.Research of weak signal acquisition algorithms for high sensitivity GPS receivers[C]∥PrimeAsia 2009.Shanghai,2009:173-176 [8] Psiaki M L.Block Acquisition of weak GPS signals in a Software Receiver[C]∥ION GPS 2001.Salt Lake City,2001 [9] 马若飞.GPS弱信号捕获算法研究及其在软件接收机上的实现[D].哈尔滨:哈尔滨工业大学,2010:17-40 [10] Kazemi P L,O’Driscoll C.Comparison of assisted and stand-alone methods for increasing coherent integration time for weak GPS signal tracking[C]∥ION GNSS 2008.Savannah,2008:1043-1053 [11] 何秋生,程亚奇.基于位跳变检测提高GPS信号处理增益方法研究[J].微电子学与计算机,2010,7(2):99-102 [12] Wu Ling-juan,Cui Ying-ying,Yu Dun-shan.Signal Acquisitionand Tracking for Software GPS[C]∥PrimeAsia 2009.Shanghai,2009:384-387 [13] 裘勋,卢艳娥,庞春雷.改进的GPS弱信号差分捕获方法研究[J].现代防御技术,2011,9(6):126-130 |
No related articles found! |
|