Description: 】The paper discusses a digital IF GPS signal generation method, gives the mathematic
model of digital IF signal. This mathematic model takes into account the influence of various
factors. Based on analysis of the navigation data, the method to estimate signal propagation time,
Doppler frequency shift and the coming angle of signal is proposed. The flow to generate IF signal
is given, in which the setting of time delay, the up-frequency conversion, the setting of signal
magnitude and the introduction of direction information are expounded. The signal generation model
is simulated and analyzed, the spectrum of signal in each stage given, and the correlation capture
of the generated signal also done. Simulation indicates that the spectrum is in accord with
theoretical analysis the signal could be captured, thus find the time delay, accomplish the
orientation. The signal model is proved applicable in the research and development of GPS receiver.
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一种数字中频GPS信号生成方法.pdf
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