Abstract
Compared with fixed detection threshold, adaptive detection threshold substantially improves the reception sensitivities in high sensitivity receivers. The optimal detection threshold depends on probability distribution of the received signals. The out-of-phase auto correlation values and cross correlation values of Chinese Compass B1-I signal were analyzed, and the probability distribution of the signal with the differential correlation technique was provided. Then the optimal detection threshold and the sensitivity gain that can be obtained by the adaptive detection threshold were provided.
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