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Hengnian Li
State Key Laboratory of Astronautic Dynamics, Xi’an Satellite Control Center, Xi’an 710049, China

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Journal article
Published: 21 August 2021 in Remote Sensing
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In challenging environments such as forests, valleys and higher latitude areas, there are usually fewer than four visible satellites. For cases with only two visible satellites, we propose a dual-satellite alternate switching ranging integrated navigation algorithm based on the broadband low earth orbit (LEO) constellation, which integrates communication and navigation (ICN) technology. It is different from the traditional dual-satellite integrated navigation algorithm: the difference is that it can complete precise real-time navigation and positioning without an altimeter and continuous observation. First, we give the principle of our algorithm. Second, with the help of an unscented Kalman filter (UKF), we give the observation equation and state equation of our algorithm, and establish the mathematical model of multipath/non-line of sight (NLOS) and noise interference. Finally, based on the SpaceX constellation, for various scenarios, we analyze the performance of our algorithm through simulation. The results show that: our algorithm can effectively suppress the divergence of the inertial navigation system (INS), in the face of different multipath/NLOS interference and various noise environments it still keeps good robustness, and also has great advantages in various indicators compared with the traditional dual-satellite positioning algorithms and some existing 3-satellite advanced positioning algorithms. These results show that our algorithm can meet the real-time location service requirements in harsh and challenging environments, and provides a new navigation and positioning method when there are only two visible satellites.

ACS Style

Lvyang Ye; Yikang Yang; Xiaolun Jing; Hengnian Li; Haifeng Yang; Yunxia Xia. Dual-Satellite Alternate Switching Ranging/INS Integrated Navigation Algorithm for Broadband LEO Constellation Independent of Altimeter and Continuous Observation. Remote Sensing 2021, 13, 3312 .

AMA Style

Lvyang Ye, Yikang Yang, Xiaolun Jing, Hengnian Li, Haifeng Yang, Yunxia Xia. Dual-Satellite Alternate Switching Ranging/INS Integrated Navigation Algorithm for Broadband LEO Constellation Independent of Altimeter and Continuous Observation. Remote Sensing. 2021; 13 (16):3312.

Chicago/Turabian Style

Lvyang Ye; Yikang Yang; Xiaolun Jing; Hengnian Li; Haifeng Yang; Yunxia Xia. 2021. "Dual-Satellite Alternate Switching Ranging/INS Integrated Navigation Algorithm for Broadband LEO Constellation Independent of Altimeter and Continuous Observation." Remote Sensing 13, no. 16: 3312.

Journal article
Published: 08 July 2021 in Aerospace
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This paper intends to show some special types of orbits around Jupiter based on the mean element theory, including stationary orbits, sun-synchronous orbits, orbits at the critical inclination, and repeating ground track orbits. A gravity model concerning only the perturbations of J2 and J4 terms is used here. Compared with special orbits around the Earth, the orbit dynamics differ greatly: (1) There do not exist longitude drifts on stationary orbits due to non-spherical gravity since only J2 and J4 terms are taken into account in the gravity model. All points on stationary orbits are degenerate equilibrium points. Moreover, the satellite will oscillate in the radial and North-South directions after a sufficiently small perturbation of stationary orbits. (2) The inclinations of sun-synchronous orbits are always bigger than 90 degrees, but smaller than those for satellites around the Earth. (3) The critical inclinations are no-longer independent of the semi-major axis and eccentricity of the orbits. The results show that if the eccentricity is small, the critical inclinations will decrease as the altitudes of orbits increase; if the eccentricity is larger, the critical inclinations will increase as the altitudes of orbits increase. (4) The inclinations of repeating ground track orbits are monotonically increasing rapidly with respect to the altitudes of orbits.

ACS Style

Yongjie Liu; Yu Jiang; Hengnian Li; Hui Zhang. Some Special Types of Orbits around Jupiter. Aerospace 2021, 8, 183 .

AMA Style

Yongjie Liu, Yu Jiang, Hengnian Li, Hui Zhang. Some Special Types of Orbits around Jupiter. Aerospace. 2021; 8 (7):183.

Chicago/Turabian Style

Yongjie Liu; Yu Jiang; Hengnian Li; Hui Zhang. 2021. "Some Special Types of Orbits around Jupiter." Aerospace 8, no. 7: 183.