An Improved Weight Optimization AAIM Method Aided by Barometric Altimeter
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ORIGINAL PAPER
An Improved Weight Optimization AAIM Method Aided by Barometric Altimeter Xiaowei Xu1,2 · Jizhou Lai1,2
· Min Liu1,2 · Zhiming Zheng3 · Yuting Dai1,2 · Kai Huang4
Received: 6 December 2018 / Revised: 1 July 2020 / Accepted: 8 September 2020 © The Korean Society for Aeronautical & Space Sciences 2020
Abstract Aiming at the problem of insufficient availability in the satellite receiver autonomous integrity monitoring (RAIM) method, an improved aircraft autonomous integrity monitoring (AAIM) method aided by barometric altimeter based on weight optimization is proposed under the actual configuration of the airborne navigation system. The information of satellite navigation system and barometric altimeter is used to establish the observation equation of the integrated system. The algorithm for integrity monitoring and protection-level calculation is derived based on multiple solution separation, and a weight optimization is adopted to achieve a trade-off between position accuracy and integrity, which can improve the availability of AAIM method. The simulation experiment shows that when the number of visible stars is 5, the traditional method cannot effectively detect the satellite fault, and the positioning error is 43.65 m. The improved algorithm can effectively isolate the fault and reduce the positioning error to 0.37 m. Compared with the traditional RAIM algorithm and the Baro-aided AAIM algorithm, the proposed algorithm has a lower vertical protection threshold. Therefore, the algorithm in this paper improves the performance of satellite navigation system integrity monitoring and ensure the accuracy and reliability of the satellite navigation system. Keywords Integrity · Barometric altimeter · Satellite navigation system · Multiple solution separation · Fault detection
1 Introduction With the application of satellite navigation system, to further improve the navigation performance and the safety of the air traffic system, the International Civil Aviation Organization (ICAO) proposed the concept of required navigation performance (RNP) in the early 1990s [1]. RNP is defined as the navigation performance that aircraft should satisfy when operating in a certain route, airspace, or region. Within the specified airspace, in case the aircraft can meet the required
B
Jizhou Lai [email protected]
1
College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, 29 Jiangjun Avenue, Nanjing, China
2
Key Laboratory of Internet of Things and Control Technology in Jiangsu Province, Nanjing University of Aeronautics and Astronautics, 29 Jiangjun Avenue, Nanjing, China
3
Shanghai Aircraft Design and Research Institute, COMAC, 5188 Jinke Road, Shanghai, China
4
Shanxi Baocheng Aviation Instrument Co., Ltd, AVIC, 70 Qingjiang Road, Baoji, China
navigation performance, then it is permitted to fly in the airspace, which could effectively improve the safety and effectiveness of the civil aviation operation [2]. Required navigation performance technology is a new technology that can
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