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GPS Pseudolite Transceivers and their Applications

机译：GPS伪卫星收发器及其应用

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摘要

There are an increasing number of applications requiring precise relative position and clock offset information. The Global Positioning System has demonstrated precise and drift free position and timing information using Code-Division-Multiple-Access (CDMA) spread spectrum technology. This technology is widely used and relatively inexpensive, making it attractive in applications beyond the scope of typical satellite based GPS.rnIn situations with limited or no visibility of the GPS satellites, ground transmitters that emulate the signal structure of the GPS satellites (pseudolites) can be used as additional or replacement signal sources.rnTransceivers (which transmit and receive GPS signals) can be used to improve standard pseudolite positioning systems. If their locations are known, transceivers can be used to remove the need for the reference antenna typically necessary in standard differential systems. By using either the GPS satellite signals or other transceiver signals, a self-surveying transmitter array can be implemented, eliminating the need for a priori knowledge of pseudolite locations. In addition, transceivers mounted on vehicles can allow continuous inter-vehicle positioning without the presence of signals from GPS satellites.rnThis paper provides an overview of the issues associated with GPS transceiver systems. This includes transceiver architectures, capabilities, and limitations. This paper also discusses several transceiver applications being studied at Stanford University including open pit mining, Mars exploration, and multiple-vehicle space-based interferometry.
机译：越来越多的应用需要精确的相对位置和时钟偏移信息。全球定位系统已使用码分多址（CDMA）扩频技术演示了精确且无漂移的位置和定时信息。这项技术被广泛使用并且相对便宜，使其在典型的基于卫星的GPS范围之外的应用中具有吸引力。在GPS卫星的可见性有限或没有可见性的情况下，可以模拟GPS卫星（伪卫星）的信号结构的地面发射器收发器（用于发送和接收GPS信号）可用于改进标准伪卫星定位系统。如果知道它们的位置，则可以使用收发器来消除对标准差分系统中通常必需的参考天线的需求。通过使用GPS卫星信号或其他收发器信号，可以实现自我测量的发射器阵列，从而无需先验知识就可以知道伪卫星的位置。此外，安装在车辆上的收发器可以连续进行车内定位，而不会出现GPS卫星发出的信号。rn本文概述了与GPS收发器系统相关的问题。这包括收发器的体系结构，功能和限制。本文还讨论了斯坦福大学正在研究的几种收发器应用，包括露天采矿，火星探测和多车天基干涉测量法。

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