A novel ‘differential’ decoding technique is proposed which enables pre-averaging instead of postintegration for a substantially low update rate ‘FFT-IFT’ correlation in sprcadspectrum (navigational) receivers. N-channel code acquisition can be performed to monitor the time dispersion with FFT time left to analyse frequency dispersion in highly reflective areas (e.g. an urban environment).
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Coenen et al. (1992) studied this question.