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## Estimation of Inter-Frequency Delays of Navigation Satellites

Transactions of IAA RAS, issue 52, 27–30 (2020)

E. A. Karaush, D. S. Pecheritsa. Estimation of Inter-Frequency Delays of Navigation Satellites // Transactions of IAA RAS. — 2020. — Issue 52. — P. 27–30. @article{karaush2020, abstract = {A necessary preliminary condition for solving of navigational problems by signals of global navigation satellite systems (GLONASS, GPS, Galileo, BeuDou) is to calculate all the sources of measurement errors, which include signal delays in radio frequency path of navigation satellites. Thus, it is important to correct these errors to provide high-precision time and coordinate determinations when using navigation signals from several GNSS. The purpose of the paper is to create a method for estimating interfrequency delays in the signals of GNSS navigation satellites. Pseudorange measurements in sub-bands L1 and L2 are proposed as input data. In the present paper, the authors discuss the problems of identification of interfrequency delays, and present the results of experimental research as well as propose a new way to estimate these delays. The main problem is the exclusion of measurement errors caused by delayed signals in the ionospheric layer of the Earth. The proposed method of evaluating the interfrequency delays includes the following conditions: the use of precision ephemerides and time satelites data, the pseudo-range measurements in the L1 and L2 bands, the processing of measurements at small values of the total electronic content (TEC). The main idea was to use only observations of GNSS navigation satellites whose relative position did not differ by more than 1°. A reference satellite with a large number of observations suitable for these conditions has been selected. The observations were also processed for different pairs of satellites, but including the same one satellite (for example, a pair of satellites number 11 (GLONASS) and number 7 (GPS), and number 11 (GLONASS) and number 21 (GLONASS). We checked the estimates of signal delays for different pairs of navigation satellites. The results obtained using the proposed algorithm showed a fundamental possibility of getting values of inter-frequency delays of GLONASS navigation satellites.}, author = {E.~A. Karaush and D.~S. Pecheritsa}, doi = {10.32876/ApplAstron.52.27-30}, issue = {52}, journal = {Transactions of IAA RAS}, keyword = {Global Navigation Satellite Systems, GLONASS, navigation signal delays, navigation satellite, pseudorange errors}, pages = {27--30}, title = {Estimation of Inter-Frequency Delays of Navigation Satellites}, url = {http://iaaras.ru/en/library/paper/2031/}, year = {2020} } TY - JOUR TI - Estimation of Inter-Frequency Delays of Navigation Satellites AU - Karaush, E. A. AU - Pecheritsa, D. S. PY - 2020 T2 - Transactions of IAA RAS IS - 52 SP - 27 AB - A necessary preliminary condition for solving of navigational problems by signals of global navigation satellite systems (GLONASS, GPS, Galileo, BeuDou) is to calculate all the sources of measurement errors, which include signal delays in radio frequency path of navigation satellites. Thus, it is important to correct these errors to provide high-precision time and coordinate determinations when using navigation signals from several GNSS. The purpose of the paper is to create a method for estimating interfrequency delays in the signals of GNSS navigation satellites. Pseudorange measurements in sub-bands L1 and L2 are proposed as input data. In the present paper, the authors discuss the problems of identification of interfrequency delays, and present the results of experimental research as well as propose a new way to estimate these delays. The main problem is the exclusion of measurement errors caused by delayed signals in the ionospheric layer of the Earth. The proposed method of evaluating the interfrequency delays includes the following conditions: the use of precision ephemerides and time satelites data, the pseudo-range measurements in the L1 and L2 bands, the processing of measurements at small values of the total electronic content (TEC). The main idea was to use only observations of GNSS navigation satellites whose relative position did not differ by more than 1°. A reference satellite with a large number of observations suitable for these conditions has been selected. The observations were also processed for different pairs of satellites, but including the same one satellite (for example, a pair of satellites number 11 (GLONASS) and number 7 (GPS), and number 11 (GLONASS) and number 21 (GLONASS). We checked the estimates of signal delays for different pairs of navigation satellites. The results obtained using the proposed algorithm showed a fundamental possibility of getting values of inter-frequency delays of GLONASS navigation satellites. DO - 10.32876/ApplAstron.52.27-30 UR - http://iaaras.ru/en/library/paper/2031/ ER -