Abstract:

The satellite navigation system achieves a higher regional performance when augmented with pseudolites but near field receivers are faced with the near  far effect considered as a roadblock in implementing pseudolite system under code division multiple access (CDMA). Firstly the existing solutions to near far effect mitigation and their features are introduced, the insufficiency of pseudo code correlation in satisfying pseudolite working area requirements is analyzed, and the algorithm of pseudolite satellite combination positioning is studied, then a technique of near far effect mitigation by employing a receiver with double radio frequency channels and an adaptive nulling antenna is proposed from the viewpoint of airspace. Finally, through experiment on a hardware in the loop simulation platform established therefor, the effectiveness of such solution in enhancing the capability of near far effect mitigation and enlarging the coverage of pseudolite argumentation system is proved.