| In 2015,our country launched a new generation of navigation IGSO satellites,which has c-band transponders.And it's the first time that the I1-S satellite was observed by the Ka-band.This paper studies the orbital determination of IGSO test satellite i1-s for two different modes of observation.1)Orbit determination for the IGSO satellite under the technology of ODTT The technology of orbit determination by transfer tracking(ODTT)has successfully applied in the orbit determination of the GEO satellite.Because of the lack of IGSO resources,there was no ODTT orbital determination for the IGSO satellite.This article first carried out the test of the orbital determination for the beidou IGSO satellite.The observation data from August 14,2015 to August 20,2015 under the technology of ODTT will be used for orbit determination,we use different length data for the test.The data conclude one-day,two-day,three-day and four-day data.The test has verified that the precision of orbit determination with three days data is better.The scope of the RMS numerical within the range of 0.14 to 0.17 meters,the average value is 0.15 meters.The orbital difference of the eclipsed arc is 0.85 meters.Experiments proved that the technology of orbit tracking and determination by ODTT has successfully applied in the orbit determination of the IGSO satellite2)Orbit determination with time-sharing observation data In actual observations,there may be little data and at present,the observation model of CAPS is continuous.To solve the problem of observing multiple satellites in one day.The data is processed by the fractional division of the data.One of the purposes is that a small amount of data verification in the case does not affect the precision of orbit determination.The other is improving the utilization rate of equipment by observing different satellite observations in turn.In this paper,the observation data from August 14,2015 to August 20,2015 will be used for orbit determination.The total residual RMS is less than 0.2 m based on different time-sharing strategies.Based on the results of the fixed track results based on different time and time strategies,the difference of the orbital difference is 0.53 m,0.77 m and 0.73 m respectively.Period of time,by analyzing the results of data calculating residual,and compared with the orbit of full time calculating the RMS value of orbit determination and full time error at the same level,not reduce the precision of orbit determination,under the standard of orbit determination precision meter scale,prove the feasibility of time-sharing observation.On the other hand,different time-sharing strategies were designed for the four satellite rotation measurements.The four satellites were observed at four hours in four hours,four satellites in eight hours and four satellites in 12 hours.In different time,the RMS is relatively small,and the accuracy of continuous observation is quite similar.The orbital difference between the proposed solution of four satellites with a 2-hour separation was the lowest in the orbit compared to the continuous observation,which was 0.73 m.Provide a reference for multiple satellite rotation observations.3)Orbit determination using the Ka-Band data The purpose of this part is studying the influence of Ka-Band on orbit determination.On the one hand,we studied the influence of the ka-band observation model arc length on orbit determination.Through the results for two days data of orbit determination is feasible.The second aspect is to estimate the acceleration effect on the precision of orbit determination.When calculating radial and along-track,compared to the other cases,the result is better than others.The third aspect is calculating the sun light pressure effect on the precision of orbit determination.By comparison with the result that orbit determination for the processing of ka-band data,join the sun light pressure model and calculating,more applicable to improve precision of the orbit. |
PDF Full Text Request