Iterative acquisition method based on Grey code for weak global positioning system signal

• Published in: IET radar, sonar & navigation Vol. 8; no. 3; pp. 220 - 226
• Main Authors: Wang, Jianhui, Ou, Gang, Zhang, Yonghu
• Format: Journal Article
• Language: English
• Published: Stevenage The Institution of Engineering and Technology 01.03.2014; The Institution of Engineering & Technology
• Subjects: Algorithms; block codes; block‐accumulating coherent integration over extended interval algorithm; Coherence; Coherence length; data bit combinations searching; Doppler frequency search bin; Global Positioning System; grey code; Intervals; iterative acquisition method; iterative decoding; modified BACIX algorithm; Order disorder; Searching; Sonar; unknown data bit estimation; weak Global Positioning System signal; unknown data bit estimation; block-accumulating coherent integration over extended interval algorithm; iterative acquisition method; iterative decoding; data bit combinations searching; block codes; Doppler frequency search bin; modified BACIX algorithm; grey code; Global Positioning System; weak Global Positioning System signal
• ISSN: 1751-8784; 1751-8792; 1751-8792
• DOI: 10.1049/iet-rsn.2013.0052

For weak global positioning system signal, long coherent integration can improve the acquisition performance effectively, but the unknown data bits restrict the coherent integration interval within a data bit. Data bits estimation can extend coherent integration interval over multiple data bits with more Doppler frequency search bins. To lighten the calculation burden of data bit combinations searching, an iterative acquisition algorithm is presented based on ordering data bit combinations by Grey code. Modified block-accumulating coherent integration over extended interval (BACIX) algorithm is also presented, which has linear complexity and better performance than BACIX algorithm.