Ranging Accuracy of MSAS Signal

导航定位与授时 Pub Date : 2021-01-01 DOI:10.5266/ipntj.12.1

T. Sakai, Mitsunori Kitamura

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Abstract

あらまし衛星航法システムに対する補強情報を送信する補強システムとして,静止衛星を使用する SBAS(Satellite-Based Augmentation System)が標準規格となっている.SBAS の信号は GPS と同一の形式であり,GPS と同様に測位衛星として利用できる. 日本の SBAS である MSAS は過去にこのために必要なメッセージを送信して測距機能を提供していた時期があるが,現在は提供していない.一方,MSAS の静止衛星は 2020 年 4 月に更新されており,信号生成方式が変更されていることから,測距機能の提供を再開した場合にはその性能に変化があるものと思われる.静止衛星の更新前後の MSAS について測距精度を評価したところ,現行の MSASでは以前よりも改善されており,GPSと同等であることがわかった. Abstract SBAS (Satellite-Based Augmentation System) is the standard system which augments GNSS using geostationary satellites. The structure of SBAS signal is same with GPS and this means the SBAS satellites have capability to work as additional ranging satellites like GPS. Japanese SBAS called MSAS once provided messages for this ranging function, but nowadays does not. Recently MSAS has updated its geostationary satellite in April 2020, and this likely means the ranging accuracy also has some difference due to change in the signal generation payload if MSAS provides the ranging function again. The authors have evaluated the ranging accuracy of the MSAS signal before and after the replacement of its geostationary satellite and confirm an improvement over the past to the same level with GPS. キーワード SBAS,MSAS,測距精度 Keyword SBAS, MSAS, ranging accuracy

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MSAS信号的测距精度

作为向卫星导航系统发送增强信息的增强系统，SBAS(satelly - based Augmentation)使用静止卫星System)为标准规格，SBAS的信号形式与GPS相同，可与GPS一样作为定位卫星使用。日本的SBAS——MSAS过去曾为此提供过发送必要的消息和测距功能，但现在已不再提供。另一方面，MSAS的静止卫星于2020年4月进行了更新，由于信号生成方式发生了变化，所以如果恢复提供测距功能，其性能应该会发生变化。对静止卫星更新前后的MSAS进行测距精度评估后发现，现行MSAS比以前有所改善，与GPS相同。(satelly - based Augmentation System) is the standard System which augments GNSS using geostationarysatellites. The structure of SBAS signal is same with GPS and this means The SBAS satellites havecapability to work as additional ranging satellites like GPS. Japanese SBAS called MSAS onceprovided messages for this ranging function，but nowadays does not. Recently MSAS has updated its geostationary satellite in April 2020，and this likely means the ranging accuracy also has some difference due to change in the signalgeneration payload if MSAS provides the ranging function again. the authors have evaluated theranging accuracy of the MSAS signal before and after the replacement of its geostationary satelliteand confirm an improvement over the past to the same level with GPS.关键词SBAS,MSAS，测距精度KeywordSBAS, MSAS, ranging accuracy

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