Method of doppler searching in a digital GPS receiver

作者： Steven C. Jasper

DOI:

关键词: Magnitude (mathematics) 、 Global Positioning System 、 Power (physics) 、 Fourier transform 、 Mathematics 、 Acoustics 、 GPS signals 、 Doppler effect 、 Electronic engineering 、 Range (statistics) 、 Square (algebra)

摘要: An improved method of doppler searching in a digital GPS receiver is described. According to the principles present invention, an N-point fourier transform performed on samples down converted signal representing entire range Doppler-shifted carrier frequencies. The magnitude square each output calculated produce N power quantities, corresponding search quantities for frequencies are then summed proportional average power. maximum N-power indicates presence signal.