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An assessment of the autonomous integrity monitoring performance of a combined GPS/Galileo Satellite Navigation System, and its impact on the case for the development of Galileo

机译：评估GPS /伽利略组合卫星导航系统的自主完整性监控性能及其对伽利略开发案例的影响

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摘要

In 1999 Europe, through the European Commission and the EuropeanSpace Agency, began detailed definition of a second generation GlobalNavigation Satellite System (GNSS). This GNSS developmentprogramme, known as “Galileo”, was intended to both complement andcompete against the existing US Global Positioning System (GPS).Unlike GPS, Galileo is intended to be privately financed, following theinitial development investment from the EC and ESA, which implies thatGalileo should provide some revenue-earning services. From its earliestinception, the basis of these services has been assumed to be throughthe provision of Signal Integrity through an Integrity Flag broadcastthrough the Galileo system– a service which GPS cannot provide withoutsome external system augmentation. This thesis undertakes a criticalevaluation of the value of this integrity system in Galileo.This thesis has two parts. The first demonstrates that the conditionsrequired to attract adequate private finance to the Galileo programmeare incompatible with the system architecture derived from the earlyGalileo system studies and taken forward into the system earlydeployment phase, which includes an Integrity system within Galileo.The second part of this thesis aims to demonstrate that receivers whichcan combine the signals from GPS and Galileo may offer a free Integrityservice which meet the needs of the majority of users, possibly up to thestandards required for aviation precision approach. A novel ReceiverAutonomous Integrity Monitoring (RAIM) technique is described, usingan Errors in Variables/Total Least Squares approach to the detection ofinconsistencies in an over-determined set of GNSS signalmeasurements. The mathematical basis for this technique is presented,along with results which compare the simulated performance of receiversusing this algorithm against the expected performance of Galileo’sinternal integrity determination system.
机译：1999年，欧洲通过欧洲委员会和欧洲航天局（European Space Agency）开始详细定义第二代全球导航卫星系统（GNSS）。该GNSS开发计划称为“伽利略”，旨在补充和竞争现有的美国全球定位系统（GPS）。与GPS不同，伽利略旨在由私人投资，这是由EC和ESA进行的初始开发投资所致。伽利略应该提供一些创收服务。从一开始就假定这些服务的基础是通过通过Galileo系统广播的完整性标志提供信号完整性，而GPS不能在不进行某些外部系统扩充的情况下提供。本文对伽利略系统完整性系统的价值进行了批判性评价。本文分为两个部分。第一部分表明，为伽利略计划吸引足够的私人资金所需的条件与早期伽利略系统研究得出的并进入系统早期部署阶段的系统架构不兼容，其中包括伽利略内部的完整性系统。本论文的第二部分旨在为了证明可以将GPS和Galileo的信号组合在一起的接收器可以提供免费的完整性服务，该服务可以满足大多数用户的需求，可能达到航空精度方法所需的标准。描述了一种新颖的接收器自治完整性监控（RAIM）技术，该方法使用变量/总最小二乘法中的误差来检测GNSS信号量超定集合中的不一致情况。介绍了该技术的数学基础，并给出了将使用该算法的接收机的模拟性能与伽利略内部完整性确定系统的预期性能进行比较的结果。

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    Loizou John;

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