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راه حل های جی پی اس 2013
جزئیات رویداد
همایش ، رویداد ، ژورنال
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  • multifrequency algorithms for precise point positioning: map3

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    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 950
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     we present the new map3 algorithms to perform static precise point positioning (ppp) from multifrequency and multisystem gnss observations. map3 represents a two-step strategy in which the least squares theory is applied twice to estimate smoothed pseudo-distances, initial phase ambiguities, and slant ionospheric delay first, and the absolute receiver position and its clock offset in a second adjustment. unlike the classic ppp technique, in our new approach, the ionospheric-free linear combination is not used. the combination of signals from different satellite systems is accomplished by taking into account the receiver inter-system bias. map3 has been implemented in matlab and integrated within a complete ppp software developed on site and named pcube. we test the map3 performance numerically and contrast it with other external ppp programs. in general, map3 positioning accuracy with low-noise gps dual-frequency observations is about 2.5 cm in 2-h observation periods, 1 cm in 10 h, and 7 mm after 1 day. this means an improvement in the accuracy in short observation periods of at least 7 mm with respect to the other ppp programs. the map3 convergence time is also analyzed and some results obtained from real triple-frequency gps and giove observations are presented.

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