Title :
Analysis of AM Phenomenon in GPS Signal
Author :
Zhang Xin ; Sha Hai ; Zhang Yong-Hu ; Zhang Guo-Zhu ; Ou Gang
Author_Institution :
Satellite Navig. R&D Center, Nat. Univ. of Defense Technol., Changsha, China
Abstract :
When transmitting BPSK modulated signal, GPS simulator can be used to calibrate hardware delay under a wide variety of conditions by determine the average measured time difference between the one pulse-per-second (1 pps) reference and the bi-phase modulated code transition point. In practice, an AM (Amplitude Modulation) phenomenon rather than ideal BPSK modulation code transition point can be observed. Considering the structure of GPS L1CA signal, this AM phenomenon is analyzed by using Fourier series expansion, and serious impact of signal reflection on AM phenomenon is assessed by simulation.
Keywords :
Fourier series; Global Positioning System; amplitude modulation; phase shift keying; AM phenomenon; BPSK modulation code transition point; Fourier series expansion; GPS LICA signal; GPS simulator; amplitude modulation phenomenon; biphase modulated code transition point; hardware delay; signal reflection; time difference; Computers; Instruments; GPS; amplitude modulation; fourier series; simulator;
Conference_Titel :
Instrumentation, Measurement, Computer, Communication and Control (IMCCC), 2013 Third International Conference on
Conference_Location :
Shenyang
DOI :
10.1109/IMCCC.2013.159
