Uncovering common misconceptions in GNSS Precise Point Positioning and its future prospect

Choy, Suelynn; Bisnath, Sunil; Rizos, Chris

doi:10.1007/s10291-016-0545-x

Cited by 113 publications

(75 citation statements)

References 20 publications

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“…Several contributions were devoted not only to algorithm development and assessment [26,32], but also to characterisation of the inter GPS-Galileo system biases both in precise relative (RTK) and absolute methods (PPP) [33][34][35][36][37]. Thus, the RTK method can be considered as under extensive development and being used for a growing number of applications.…”

Section: Gsat0201 (5-mentioning

confidence: 99%

On the Applicability of Galileo FOC Satellites with Incorrect Highly Eccentric Orbits: An Evaluation of Instantaneous Medium-Range Positioning

2018

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This study addresses the potential contribution of the first pair of Galileo FOC satellites sent into incorrect highly eccentric orbits for geodetic and surveying applications. We began with an analysis of the carrier to noise density ratio and the stochastic properties of GNSS measurements. The investigations revealed that the signal power of E14 & E18 satellites is higher than for regular Galileo satellites, what is related to their lower altitude over the experiment area. With regard to the noise of the observables, there are no significant differences between all Galileo satellites. Furthermore, the study confirmed that the precision of Galileo data is higher than that of GPS, especially in the case of code measurements. Next analysis considered selected domains of precise instantaneous medium-range positioning: ambiguity resolution and coordinate accuracy as well as observable residuals. On the basis of test solutions, with and without E14 & E18 data, we found that these satellites did not noticeably influence the ambiguity resolution process. The discrepancy in ambiguity success rate between test solutions did not exceed 2%. The differences between standard deviations of the fixed coordinates did not exceed 1 mm for horizontal components. The standard deviation of the L1/E1 phase residuals, corresponding to regular GPS and Galileo, and E14 & E18 satellite signals, was at a comparable level, in the range of 6.5-8.7 mm. The study revealed that the Galileo satellites with incorrect orbits were fully usable in most geodetic, surveying and many other post-processed applications and may be beneficial especially for positioning during obstructed visibility of satellites. This claim holds true when providing precise ephemeris of satellites.

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Section: Gsat0201 (5-mentioning

confidence: 99%

On the Applicability of Galileo FOC Satellites with Incorrect Highly Eccentric Orbits: An Evaluation of Instantaneous Medium-Range Positioning

2018

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“…PPP-RTK is a synthesis of the positive characteristics of PPP and network-RTK (Wabbena, Schmitz, and Bagge 2005). PPP is a unique positioning technique that can truly offer global precise positioning solutions without the requirements of local reference networks, while network-RTK could further improve the performance of PPP on a regional scale through provision of accurate atmospheric information aiding rapid fixing of carrier phase ambiguities (Choy, Bisnath, and Rizos 2017). Integration of these two techniques will lead to improved position accuracy and timeliness.…”

Section: Ppp-rtkmentioning

confidence: 99%

The Australian approach to geospatial capabilities; positioning, earth observation, infrastructure and analytics: issues, trends and perspectives

Woodgate

Coppa

Choy

et al. 2017

Geo-spatial Information Science

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This paper examines the current state of three of the key areas of geospatial science in Australia: positioning; earth observation (EO); and spatial infrastructures. The paper discusses the limitations and challenges that will shape the development of these three areas of geospatial science over the next decade and then profiles what each may look like in about 2026. Australia's national positioning infrastructure plan is guiding the development of a nation-wide, sub decimeter, real-time, outdoor positioning capability based on multi-GNSS and in particular the emerging precise point positioning − real-time kinematic (PPP-RTK) capability. Additional positioning systems including the ground-based Locata system, location-based indoor systems, and beacons, among others are also discussed. The importance of the underpinning role of a next generation dynamic datum is considered. The development of Australia's first EO strategy is described along with the key national needs of the products of remote sensing. The development of massive on-line multi-decadal geospatial imagery data stores and processing engines for co-registered stacks of continuous base-line satellite imagery are explored. Finally, perspectives on the evolution of a future spatial knowledge infrastructure (SKI) emerging from today's traditional spatial data infrastructures (SDIs) are provided together with discussion of the growing importance of geospatial analytics for transforming whole supply chains.

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“…Bu yöntemin öne çıkan bazı avantajları, sadece tek bir alıcı ile toplanan verilere gereksinim duyulması, yüksek doğruluğu, uygulama kolaylığı, düşük maliyeti ve küresel bir referans sisteminde konum belirlemenin mümkün olmasıdır. Söz konusu yöntem ile cm ila dm'ler arasında değişen doğruluklarla statik veya kinematik olarak konum belirlemek mümkün olmaktadır (Zumberge et al 1997;KoubaandHéroux, 2001;Kouba, 2003;Choy et al 2007;Geng et al 2010;Martín et al 2011;Alkan and Öcalan, 2013;Anquela et al 2013;Lou et al 2016, Choy et al 2017. Anılan sebepler nedeniyle PPP tüm dünyada artan bir ilgiyle ve pek çok farklı uygulamada yaygın olarak kullanılmaktadır.…”

Section: Introductionunclassified

Web-based Online Data Processing Services as an Alternative to Conventional GNSS Processing Software

Alkan¹,

Ozulu²,

İlçi³

2017

AKU-J. Sci. Eng.

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Bu çalışmada web-tabanlı online değerlendirme servislerinin ölçme uygulamalarında kullanılabilirlikleri ve doğruluk performansları analiz edilmiştir. Çalışmada 2 farklı yaklaşımla değerlendirme yapan servislerele alınmıştır. Bunlardan birinci gruptakiler, CSRS-PPP, APPS, GAPS ve magicGNSS, PPP tekniği ile noktaların mutlak anlamda konumlarını belirlemekte iken; ikinci gruptakiler, OPUS ve AUSPOS, ölçme yapılan noktanın etrafındaki International GNSS Service (IGS), CORS (Continuously Operating Reference Station) vb. ağlara ait noktaları sabit (referans) istasyon olarak alıp, rölatif yöntemle konum belirlemektedir. Bu amaçla TUSAGA-Aktif ağına ait 146 noktadan biri olan CORU noktasında statik olarak toplanan 24 saatlik veri seti, bu web-tabanlı online GNSS veri değerlendirme servislerine gönderilmiş ve değerlendirilmiştir. Ek olarak doğruluğun ölçme süresi ile ilişkisini de belirlemek için, 24 saatlik veri seti, 1, 2, 4, 6 ve 12'şer saatlik alt gruplara ayrılmış ve bunların her biri anılan bu servislerle değerlendirilmiştir. Elde edilen sonuçlar PPP tekniği ile özellikle uzun ölçme sürelerine sahip veri setleri (2 saat ve daha fazla) kullanılarak cm-dm mertebesindeki doğruluklarla konum belirlenebileceğini göstermiştir. Rölatif yöntem kullanarak çözüm yapan web-tabanlı online servislerle ise klasik jeodezik yaklaşımlarla, daha güvenilir ve yüksek doğruluklarla nokta konumları belirlenmiştir. Sonuçlar, cm'ler mertebesinde yatay konum, dm ve altı mertebesinde yükseklik doğruluğuna 2 saatlik ölçme süresinin yeterli olduğunu göstermiştir. Genel olarak söylenecek olursa, çalışmadan elde edilen sonuçlar onlineGNSS değerlendirme servisleri ile ekonomik ve kolay bir şekilde, pek çok ölçme uygulamasına yeterli olacak doğruluklarla konum belirlemenin mümkün olduğunu göstermiştir.

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Uncovering common misconceptions in GNSS Precise Point Positioning and its future prospect

Cited by 113 publications

References 20 publications

On the Applicability of Galileo FOC Satellites with Incorrect Highly Eccentric Orbits: An Evaluation of Instantaneous Medium-Range Positioning

On the Applicability of Galileo FOC Satellites with Incorrect Highly Eccentric Orbits: An Evaluation of Instantaneous Medium-Range Positioning

The Australian approach to geospatial capabilities; positioning, earth observation, infrastructure and analytics: issues, trends and perspectives

Web-based Online Data Processing Services as an Alternative to Conventional GNSS Processing Software

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