顾及电离层梯度监测的JPALS阵列接收机设计

doi:10.7527/S1000-6893.2024.31075

Abstract

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:

V249.3

Xin XU, Liang LI, Jiaxiang LI, Jiachang JIANG, Yilin WEI. JPALS reference receivers topology design for ionospheric gradient monitoring[J]. Acta Aeronautica et Astronautica Sinica, 2025, 46(8): 331075.

Figures/Tables 11

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仿真参数	数值
完好性监测误警率P_fa	10^-9
完好性监测漏检率P_md	10^-7
仿真频点	B1C/B3I
电离层梯度监测阈值I_req/（mm·km^-1）	220
载波相位非差标准差σ₀/mm	3^［19］

参考接收机阵列构型	l/m
参考接收机阵列构型	姿态范围10°	姿态范围15°	姿态范围20°	姿态范围25°	姿态范围30°
平面正方形	132.50	138.00	145.50	156.50	171.50
平面“Y”型	187.00	194.31	205.30	220.72	241.80
次优空间型（h=10）	186.94	194.26	205.20	220.56	241.60
次优空间型（h=20）	186.86	194.10	204.90	220.07	240.90
次优空间型（h=30）	186.74	193.80	204.40	219.30	240.00

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JPALS reference receivers topology design for ionospheric gradient monitoring

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