The Analysis of Constellation of Five or Six Satellites in Regional Navigation System
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The regional navigation constellation composed of three geostationaries and four inclined circle orbit satellites is analyzed. Raise a project of constellation composed of five or six satellites. The feasibility of two projects is analyzed by simulation, then compare the performance of five satellites and six satellites, finally design a constellation of five satellites composed of geostationary and inclined circle orbit satellites.Keywords:
Satellite constellation
Orbit (dynamics)
Medium Earth orbit
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Aim to the problem of Beidou II navigation system optimal geometric arrangements,simulated analyzed GDOP and number of visible satellites,selected constellation parameters,designed GEO+MEO constellation for our country navigation demand,on the basic of that,increased the tilt of the earth synchronous orbit satellite system.
Dilution of precision
Orbit (dynamics)
Satellite constellation
Sun-synchronous orbit
Navigation System
Medium Earth orbit
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Based on the idea of transmitting the satellite navigation and positioning system, taking the distribution and variation of the Position Dilution of Precision factor (PDOP), which is closely related with the precision of navigation and positioning, within the China area as the primary criterion, we analyze and discuss the tentative plan of constellation configuration consisting of geosynchronous orbit (GEO) communication satellites and inclined geosynchronous orbit (IGSO) satellites for the transmitting Chinese Area Positioning System (CAPS). We emphatically consider the effect on the PDOP by the three major orbit parameters including the inclination, eccentricity and right ascension of the ascend- ing node (RAAN) of IGSO satellites, to research the strategies of the constellation configuration of CAPS through software emulation. Various constellation configurations are analyzed and compared and the results show that the constellation configuration, consisting of three IGSO communication satellites in three orbits with the same inclination as 50°, the difference in RAAN as 120° and the same 8 shaped ground track centered near 115°E and four or five GEO communication satellites within 60°E to 150°E, can satisfy the requirement that Chinese domain is availably covered and the navigation and positioning with high precision could be obtained. Three relatively excellent constellation configurations are initially suggested and some concerned issues are discussed in this work.
Dilution of precision
Medium Earth orbit
Satellite constellation
Orbit (dynamics)
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The orbit of HJ-1A/1B satellites is designed based on constellation design theory and satellite system theory.Theses two satellites are parts of Small Satellite Constellation in observing Earth environment and disaster.The orbit control scheme is designed in this paper.
Satellite constellation
Orbit (dynamics)
Medium Earth orbit
Sun-synchronous orbit
Elliptic orbit
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We study some design methods of satellite constellation for partial coverage.In order to cover China continuously,we research the relative merits of most possible constellation design projects,which include the inclined circular orbit constellation,constellation,elliptical orbit constellation,the circular polar orbit constellation,equatorial plane constellation.By comparison and simulation analysis,the equatorial plane constellation and the inclined circular orbit regional coverage constellation are better projects for China continuous coverage.
Satellite constellation
Circular orbit
Orbit (dynamics)
Polar orbit
Medium Earth orbit
Elliptic orbit
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The question of constellation rotation in autonomous orbit determination based on inter-satellite ranging was studied.Approach of observation of constellation orientation was put forward to control rotation error.Through the simulation,it is concluded that the method of constellation absolute orientation can estimate the constellation rotation error and achieve high precision orbit result.With inter-satellite ranging and absolute orientation,the URE of constellation is about 1.2 meters after 60 days arc.
Satellite constellation
Orbit (dynamics)
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Constellation design and performance analysis for regional satellite navigation system in China area
Based on the idea of covering China area, a novel constellation is proposed, consisting of one geostationary satellite and five inclined elliptic orbit geosynchronous satellites in this paper. Through a number of simulation tests, the orbital elements of each satellite are designed concretely. Moreover, its coverage performance is also evaluated under some factors, such as the geometric dilution of precision (GDOP), orbital perturbation, space transmission loss and eclipse. What's more, this constellation is compared with other constellations. Finally, Simulation results show, in this constellation, the number of satellites is small, and the navigation precision is relatively high. Therefore, this is a kind of high performance and economic regional navigation system for China.
Dilution of precision
Satellite constellation
Eclipse
Medium Earth orbit
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Orbit (dynamics)
Ground track
Satellite constellation
Orbit Determination
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The Chinese Area Positioning System (CAPS), a navigation system based on GEO communication satellites, was developed in 2002 by astronomers at Chinese Academy of Sciences. Extensive positioning experiments of CAPS have been performed since 2005. On the basis of CAPS, this paper studies the principle of navigation constellation composed of Slightly Inclined Geostationary Orbit (SIGSO) communication satellites. SIGSO satellites are derived from end-of-life Geostationary Orbit (GEO) satellites under inclined orbit operation. Considering the abundant frequency resources of SIGSO satellites, multi-frequency observations could be conducted to enhance the precision of pseudorange measurements and ameliorate the positioning performence. The constellation composed of two GEO satellites and four SIGSO satellites with inclination of 5 degrees can provide the most territory of China with 24-hour maximum PDOP less than 42. With synthetic utilization of the truncated precise (TP) code and physical augmentation factor in four frequencies, navigation system with this constellation is expected to obtain comparable positioning performance with that of coarse acquisition code of GPS. When the new approach of code-carrier phase combinations is adopted, the system has potential to possess commensurate accuracy of precise code in GPS. Additionally, the copious frequency resources can also be used to develop new anti-interference techniques and integrate navigation and communication.
Pseudorange
Orbit (dynamics)
Code (set theory)
Orbit Determination
Satellite constellation
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Satellite constellation is IRNSS, consists of 7 satellites which provides regional coverage only. The objective of this work is to design a satellite constellation for worldwide coverage, from a specified launch station and schedule the launch date and time of the satellites. Satellite constellations were developed using the Walker's method, by varying the height, inclination, orbital plane, phasing parameter using the System Tool Kit (STK) software and select the suitable one based on the parameter Geometric Dilution of Precision (GDOP). The value of GDOP should be minimum for better constellation. Satellite constellation design at a height of 23000 km, gives an arrangement of 30 satellites in 10 orbital plane, with phasing parameter 6 and inclination of 45 degree. In Walker's method, satellites are arranged uniformly at an equal altitude and inclination. Compared to polar constellation method coverage using Walker constellation method is more in the equatorial plane, also the number of satellites required per plane is low. The proposed satellite constellation gives GDOP value 2.8, hence satellite constellation is better.
Dilution of precision
Satellite constellation
Orbital plane
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This paper presents an algorithm for Real-Time Orbit Determination (RTOD) of navigation satellites for the Korean Regional Navigation Satellite System (KRNSS), when the navigation satellites generate ephemeris by themselves in abnormal situations. The KRNSS is an independent Regional Navigation Satellite System (RNSS) that is currently within the basic/preliminary research phase, which is intended to provide a satellite navigation service for South Korea and neighboring countries. Its candidate constellation comprises three geostationary and four elliptical inclined geosynchronous orbit satellites. Relative distance ranging between the KRNSS satellites based on Inter-Satellite Ranging (ISR) is adopted as the observation model. The extended Kalman filter is used for real-time estimation, which includes fine-tuning the covariance, measurement noise, and process noise matrices. Simulation results show that ISR precision of 0.3-0.7 m, ranging capability of 65,000 km, and observation intervals of less than 20 min are required to accomplish RTOD accuracy to within 1 m. Furthermore, close correlation is confirmed between the dilution of precision and RTOD accuracy.
Dilution of precision
Orbit Determination
Ranging
Ephemeris
Orbit (dynamics)
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