Prediction of BeiDou Satellite Orbit Maneuvers to Improve the Reliability of Real-Time Navigation Products

Abstract

The positioning, navigation, and timing (PNT) service of the Global Navigation Satellite System (GNSS) is developing in the direction of real time and high precision. However, there are some problems that restrict the development of real-time and high-precision PNT technology. Satellite orbit maneuvering is one of the factors that reduce the reliability of real-time navigation products, especially the high-frequency orbit maneuvering of geostationary earth orbit (GEO) and inclined geosynchronous orbit (IGSO) satellites. The BeiDou Navigation Satellite System (BDS) constellation is designed to contain GEO, IGSO, and medium earth orbit (MEO). These orbit maneuvers bring certain difficulties for data processing, especially for BeiDou satellites, such as decreased real-time service performance, which results in real-time navigation products including unusable maneuvered satellites. Additionally, the performance of real-time navigation products will decrease because the orbit maneuvers could not be known in advance, which diminishes the real-time PNT service performance of BDS for users. Common users cannot obtain maneuvering times and strategies owing to confidentiality, which can lead to a decline in the BDS real-time service performance. Thus, we propose a method to predict orbit maneuvers. BDS data from the broadcast ephemeris were analyzed to verify the availability of the proposed method. In addition, the results of real-time positioning were analyzed by using ultra-rapid orbit products, demonstrating that their reliability is improved by removing maneuvered satellites in advance. This is vital to improve the reliability of real-time navigation products and BDS service performance.

Study of resistance performance of Al2O3–ZnO–Y2O3thermal control coating exposed to vacuum-ultraviolet irradiation

“…The material is considered to be an ideal material. The lattice number of color center generation in each molecular layer is N 0 , and the probability of color center generation in the inner molecular layer is m. Therefore, the relation between color center concentration (C d ) and irradiation time (T), color center generation probability is shown in formula (1).…”

“…With the development of space science and technology, geosynchronous orbit satellites are being developed with light weight, long life and high reliability. 1,2 Thermal control coating is a main passive thermal control means to ensure the temperature balance of the satellite, [3][4][5] guaranteeing the highly reliable operation of the satellite. Therefore, it is desired to develop a novel thermal control coating with light weight and high space stability to improve the service life of satellites.…”

BDS Orbit Maneuver Detection Based on Epoch-Updated Orbits Estimated by SRIF

“…GEO and IGSO satellites have a greater frequency of orbit maneuvers in comparison to MEO satellites due to the resonance effect induced by the earth's rotation [5]. The BeiDou Satellite Navigation System (BDS) is comprised of GEO, IGSO, and MEO satellites, resulting in a much higher frequency of orbit maneuvers in comparison to other satellite navigation systems [3,6,7].…”

“…In the past, great efforts were made towards the orbit maneuver detection of GNSS satellites. Orbit maneuvers can be detected and analyzed by using the orbital elements from broadcast ephemeris [3,7,8]. Qin and Huang et al, used the OMC (observation minus computation) and SPP (single point positioning) results according to broadcast ephemeris and pseudo-range observation data to detect orbit maneuver time [9][10][11].…”