Search academic texts

Information × Registration Number 0318U004024, 0117U001440 , R & D reports Title Development of method for eliminating instrumental errors in ionospheric delays in GNSS- observations in order to improve the accuracy of ionospheric total electron concentration modelliny popup.stage_title Удосконалення методів усунення інструментальних похибок іоносферних затримок ГНСС-спостережень з метою підвищення точності моделювання повного електронного вмісту (ПЕВ) іоносфери Head Zhalilo O.O., Кандидат технічних наук Registration Date 18-01-2018 Organization Main Astronomical Observatory popup.description2 The research is aimed at the development of methods, algorithms and software tools for estimating and accounting for instrumental errors in the slant ionospheric delays of GNSS observations in order to improve the accuracy of modeling the total electronic content (TEC) of the ionosphere according using the results of satellite observations in the regional networks of permanent reference stations. In the course of the work the following tasks were performed: 1) algorithmic and software tools have been created that realize high precision estimation of carrier-phase instrumental signal delays in GPS satellite equipment based on the observations of the regional networks of permanent reference stations; 2) experimental studies, validation of the improved methods, algorithmic and software tools for estimating and eliminating the instrumental errors in ionospheric delays in GPS observations. It is shown that with the use of observations of GNSS stations in Ukraine and ephemeris-time data from the IGS international service, a high precision estimation of carrier-phase instrumental signal delays is achieved. The result of the validation of the developed algorithmic and software tools for eliminating instrumental errors in GPS observations using the developed realization of the PPP (Precise Point Positioning) method was the confirmation of the possibility of reliable discrete/integer resolution of carrier-phase ambiguity at the initialization solution intervals up to 15?20 minutes and achieving centimeter accuracy of positioning. The proposed algorithmic and software tools for processing GPS observations, estimating and accounting for instrumental errors in GPS observations, discrete/integer resolution of the carrier-phase ambiguity of GPS observations, as well as previously developed ionospheric modeling tools that together implement the differential and autonomous (PPP) processing methods of the network measurements, make it possible to increase the accuracy of modeling ionosphere TEC about ~24?96% in comparison with the global model GIM IONEX IGS. Performing this work simultaneously allowed us to obtain a domestic realization of the autonomous PPP-method of precision positioning with a discrete carrier-phase ambiguity resolution with characteristics corresponding to the best world analogues. Product Description popup.authors Ємець А.І. Жаліло Н.О. Жаліло О.О. popup.nrat_date 2020-04-02 Close