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首页> 外文会议>International Symposium on Certification of GNSS Systems Services >The benefits of using GPS Simulators for the testing and evaluation of GPS Receivers in lifesaving emergency distress beacons
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The benefits of using GPS Simulators for the testing and evaluation of GPS Receivers in lifesaving emergency distress beacons

机译：使用GPS模拟器在救生窘迫信标中测试和评估GPS接收器的益处

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This paper is an updated version of a paper originally presented at CERGAL 2007 last year and further builds on some preliminary test results that were presented at NAV07 last November. The Cospas-Sarsat System is an internationally recognised programme that relays distress alerts from 406 MHz emergency beacons (ELTs, EPIRBs and PLBs) over a satellite network to ground stations located in many countries around the world. In order to work with the geostationary satellites which form the latest part of this system and to provide a location to the rescue services it is becoming increasingly popular to incorporate a GPS Receiver into these beacons to provide position information in the transmitted distress message. As these beacons are not used except in an emergency and this maybe years after they where produced and on the other side of the world the GPS Receiver does not have access to any valid ephemeris or almanac data and thus has to "cold start". At the same time these beacons are usually activated in less than ideal conditions, often under foliage, in rough seas or without a clear view of the sky making GPS reception difficult, especially when the receiver is required to cold start. It has been shown that the GPS Receivers in some beacons do not cope well under these conditions and that manufacturers and national type approval and testing authorities need a reliable means of testing their beacons to ensure that they will provide position information when required in an emergency. The Radio Technical Committee for Maritime Services (RTCM) in the USA has thus been developing new testing standards for Integral GPS Receivers in EPIRBs and PLBs in conjunction with Spirent Communications PLC using GPS Simulators to provide reliable repeatable test scenarios that can be included in both national and international standards for these beacons. This paper describes the background to this work, presents initial results and provides examples of some of the issues and challenges faced in developing these products and the need for simulated scenarios, test methods and standards for testing GPS Receivers in harsh environments. Test results obtained from running 136 scenarios are presented, together with an analysis of the results obtained. The average TTFF of all the PLBs across all the tested scenarios was 4 minutes 29 seconds and the average location error was 287 metres. It should be remembered that in each case the GPS Receivers were cold started, usually under less than ideal reception conditions.
机译：本文是去年2007年CERGAL 2007年介绍的一篇文章的更新版本，并进一步建立了去年11月在NAV07上呈现的一些初步测试结果。 COSPAS-SARSAT系统是一个国际公认的计划，将406 MHz紧急信标（elts，epilebon和plbs）从卫星网络到位于全球许多国家的地面站中转移到卫星网络上。为了使用形成该系统的最新部分的地球静止卫星，并提供给救援服务的位置，将GPS接收器结合到这些信标中越来越受欢迎，以在发送的遇险消息中提供位置信息。除了在紧急情况外，没有使用这些信标的，这可能是在世界的另一面和世界另一侧的何种年份，GPS接收器无法访问任何有效的星历或历史赛数据，因此必须“冷启动”。同时，这些信标通常以较少的理想条件激活，通常在叶子，汹涌的海洋中，或者在没有明确的天空的情况下使GPS接收困难，特别是当接收器需要冷启动时。已经表明，在这些条件下，一些信标的GPS接收器不会很好地应对，制造商和国家类型批准和检测机构需要一种可靠的测试信标的方法，以确保他们在紧急情况下提供职位信息。美国海事署（RTCM）的无线电技术委员会在使用GPS模拟器提供思博伦通信PLC中，开发了EPIBLB和PLBS中整体GPS接收器的新测试标准，以提供可靠的可重复测试场景，可包含在国家和国际标准的这些信标。本文介绍了对此工作的背景，提出了初始结果，并提供了开发这些产品的一些问题和挑战的示例，以及需要在恶劣环境中测试GPS接收器的模拟场景，测试方法和标准。从运行136场景获得的测试结果，以及对所获得的结果的分析。所有测试场景的所有PLB的平均TTFF为4分29秒，平均位置误差为287米。应该记住，在每种情况下，GPS接收器都是冷启动的，通常不到理想的接收条件。

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