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Acta Aeronautica et Astronautica Sinica ›› 2025, Vol. 46 ›› Issue (8): 331075.doi: 10.7527/S1000-6893.2024.31075

• Electronics and Electrical Engineering and Control • Previous Articles    

JPALS reference receivers topology design for ionospheric gradient monitoring

Xin XU1, Liang LI1(), Jiaxiang LI2, Jiachang JIANG1, Yilin WEI1   

  1. 1.College of Intelligent Systems Science and Engineering,Harbin Engineering University,Harbin 150001,China
    2.Marine Design and Research Institute of China,Shanghai 200011,China
  • Received:2024-08-19 Revised:2024-10-31 Accepted:2024-11-18 Online:2024-12-06 Published:2024-12-05
  • Contact: Liang LI E-mail:liliang@hrbeu.edu.cn
  • Supported by:
    National Natural Science Foundation of China(62373117)

Abstract:

Ionospheric gradient is the major risk source to be monitored at the atmospheric segment for the Joint Precision Approach and Landing System (JPALS) of the BeiDou navigation satellite system (BDS). The phase observations collected from multiple short-baseline reference receivers installed on the aircraft carrier are always leveraged to monitor the ionospheric gradient. The topologies of reference receivers determine the sensitivity of ionospheric gradient monitoring. The limitations due to the carrier’s moving deck and the incorrect ambiguity fixing, the ionospheric gradient monitoring sensitivity based on the traditional planar topologies is inevitably reduced. In this paper, a design method of spatial reference receivers’topologies is proposed. A cost function representing the dead-zone of ionospheric gradient monitoring is constructed to adjust the topologies of reference receivers and to reduce the monitoring dead-zone, thereby improving the sensitivity of ionospheric gradient monitoring during the precise approach phase. Additionally, a suboptimal spatial topology of reference receivers, considering the constraints of attitude changes, is proposed to meet the installation requirements of the carrier. Simulation results show that the monitoring sensitivity of the proposed regular tetrahedron topology can be immune to attitude changes when the ambiguity is correctly fixed. Furthermore, when compared with the traditional planar square topology, the designed suboptimal spatial topologies can reduce the monitoring dead-zone by 39.32%.

Key words: BDS JPALS, integrity, ionospheric gradient, monitoring sensitivity, spatial topology

CLC Number: