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Information × Registration Number 0219U000244, 0118U006011 , R & D reports Title Development of the high-accuracy multi-position phase system "Vega-V" for determining the trajectories of near-Earth high-dynamic flying vehicles (MPSTM) popup.stage_title Head Medvedsky Myhaylo, Registration Date 23-01-2019 Organization Main Astronomical Observatory popup.description2 1. The scientific and technical substantiation of the concept of construction and functioning of the MPSTM "Vega-V" The structure and functional purpose of MPSTM ground and airborne segments components were determined.2. A mathematical model of MPSTM observations including a refined model of errors was developed. An a priori estimation of the accuracy of trajectory determinations was performed. The estimated values RMS (root mean square) for determining the parameters of space vehicle motion at altitudes from 500 km to 36 thousand km are in the range of 0,20?1,2 m for coordinates and 2-18 cm/s for the velocity vector components (VVC). The estimated values RMS for determining the motion parameters of near ground HDFV are within 0,05-0,40 m for coordinates and 0,5-1,6 cm/s for VVC.3. The results of the development of mathematical support and software (MSS) structure for the joint processing of observations of signal parameters from the monitored objects and signals of global navigation satellite systems (GNSS) in post-session and real-time modes are presented.4. The ways of implementing the methods and means of time scales (TS) synchronization of space-separated MPSTM ground measuring stations are considered. It is shown that the use/adaptation of well-known proven technologies for GNSS observations processing to MPSTM allows solving the problem of TS synchronization of separated MPSTM receivers with subnanosecond accuracy without using special additional synchronization systems.5. The method for control of the accuracy and calibration of the system is proposed which involves the use of an unmanned aerial vehicle (UAV) of quadrocopter type, as well as hardware and software tools of high-precision kinematic GNSS positioning.6. The method for updating/calibrating of tropospheric models of MPSTM signal delays has been proposed and experimentally developed (when determining the parameters of trajectories of the objects moving inside the troposphere layer) using high-precision estimates of zenith tropospheric delays (ZTD) of GNSS GPS signals. The test results showed that the accuracy of tropospheric delays estimates 1,3-8 times increases depending on the place of observation and the elevation angle of the object. 7. A separate mathematical model of MPSTM dual-frequency code and phase observations is created to confirm its operability and trajectory determinations accuracy using real GPS observations of permanent reference stations in Ukraine. A prototype of mathematical support and software (MSS) for post-session processing of MPSTM observations for SV trajectory determinations has been created, the tests of the MSS prototype have been carried out. The evaluation of trajectory determinations accuracy showed the achievement of the following accuracy of medium-orbit SV trajectory determinations:- in the distance-interferometric (query) mode of the system operation the RMS values of determining the SV coordinates are within 0,16-0.45 m; the values of VVC RMS are within 0,7-1,0 cm/s; - in the interferometric (request-free) mode of the system operation the RMS values for determining the SV coordinates are within 21-50 m. Product Description popup.authors Ємець А. І. Головня М. В. Дохов О.І. Жаліло О. О. Катюшина О.В. Лук'янова О.О. Медведський М. М. Хода О.О. Яковченко О.І. popup.nrat_date 2020-04-02 Close