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首页> 外文会议>14th international technical meeting of the Satellite Division of the Institute of Navigation (ION GPS-2001) >Mitigation of the Near-Far Problem by Successive Interference Cancellation
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Mitigation of the Near-Far Problem by Successive Interference Cancellation

机译：通过连续干扰缓解近距离问题 r n取消

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摘要

Accuracy, availability, and continuity of service forrncertain high precision applications cannot be met byrnGlobal Positioning System (GPS) alone. An example isrnthe precision approach and landing of aircraft. Groundrnbased transmitters called pseudolites have been proposedrnfor GPS augmentation to meet these critical requirements.rnA large variation in the range between the pseudoliterntransmitter and the receiver causes large fluctuations inrnthe received signal power. In the region near thernpseudolite, the pseudolite signals can be orders ofrnmagnitude stronger than the satellite signal power,rnmaking it difficult for the receiver to simultaneouslyrndetect the satellite signals. This is called the near-farrnproblem.rnMany of the techniques proposed or implemented atrnpresent require a modification of the receiver front end orrnthe pseudo random noise code structure. This paperrndescribes the application of a signal processing technique,rnknown as successive interference cancellation (SIC), thatrnmakes the receiver immune to the near-far problemrnwithout modifications to the receiver front end or thernsignal structure. In addition to the direct signal from thernpseudolite, strong pseudolite multipath signals can alsornlead to degradation in receiver performance in a near-farrnscenario. A new technique, which we call reverse SICrn(RSIC), is also developed and implemented to estimaternand remove the pseudolite multipath signals. This resultsrnin reduced multiple access interference for weak satelliternsignals in a near-far environment and improved rangernmeasurement to the pseudolite. The new architecture isrnimplemented on simulated and experimental near-far datarnsets. The results are compared to a conventional detectorrnshowing improvements in acquisition and trackingrnperformance in the presence of a strong pseudolite.
机译：仅全球定位系统（GPS）不能满足某些高精度应用程序的准确性，可用性和连续性。一个例子是飞机的精确进近和着陆。已经提出了称为伪卫星的地面发射器，以用于GPS增强以满足这些关键要求。伪升发射器和接收器之间的距离变化很大，会导致接收信号功率发生较大波动。在伪卫星附近的区域中，伪卫星信号可能比卫星信号功率强几个数量级，这使得接收机很难同时检测到卫星信号。这被称为near-farrn问题。目前提出或实施的许多技术都需要修改接收机前端或伪随机噪声码结构。本文介绍了一种称为连续干扰消除（SIC）的信号处理技术的应用，该技术可以使接收机不受近端问题的影响，而无需修改接收机前端或信号结构。除了来自伪卫星的直接信号外，强伪卫星多径信号还会导致在近场情况下接收机性能的下降。还开发并实现了一种新技术，称为反向SICrn（RSIC），用于估计和去除伪卫星多径信号。结果减少了近距离环境中弱卫星信号的多址干扰，并改善了对伪卫星的距离测量。新架构在模拟和实验性近距离数据集上实现。将结果与常规检测器进行比较，常规检测器在强伪卫星的存在下显示了捕获和跟踪性能的改进。

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