A Solution of the Near-Far Effect Based on the Orthogonality of Pseudolite Signal
一种基于伪卫星信号正交性的远近效应消除技术

The main difficulty in the use of pseudolites is the near-far effect, where the strong signal component prevents a conventional receiver from detecting the weak component. A new solution based on the orthogonality of the pseudolite signal is presented, which constructs the orthogonal projection of the strong component and then cancels out this projection from the received signal to reduce the interference of the strong component on acquiring the weaker. This solution needs neither to modify the receiver’s hardware nor to estimate the amplitude of the signal component. Simulation results shows that, at the same acquisition probability of 90%, the performance of near-far resistance of this new method compared with conventional sliding detector is improved about 9 dB.