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We present an approach using INS-aided GPS tracking loop with FFT frequency discriminator for tracking of dynamic weak GPS signals. In this approach, the FFT carrier frequency discriminator is used to deal with the attenuated GPS signal, and the INS is used to handle the platform dynamics. With a tactical level INS aiding, when the CN0 of the GPS signal is as low as 19 dB-Hz and the platform dynamic...
An open loop tracking architecture, which tracks GPS signals under weak and challenging conditions, is analyzed. The in-phase and quadrature-phase integration pair is regarded as a single tone complex signal. An FFT-based method is used as a frequency discriminator to estimate the Doppler frequency residual of the single tone signal. Another FFT-based method applies complex squaring to eliminate the...
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