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Acta Aeronautica et Astronautica Sinica ›› 2024, Vol. 45 ›› Issue (21): 330149.doi: 10.7527/S1000-6893.2024.30149

• Electronics and Electrical Engineering and Control • Previous Articles    

Criterion MP-S for multi-scale cascaded geomagnetic matching similarity measurement

Yixuan YOU1,2, Xinchun JI1,3(), Dongyan WEI1, Yi LU1,2, Hong YUAN1   

  1. 1.Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China
    2.School of Electronic,Electrical and Communication Engineering,University of Chinese Academy of Sciences,Beijing 100049,China
    3.School of Electronics and Information,Northwestern Polytechnical University,Xi’an 710072,China
  • Received:2024-01-15 Revised:2024-03-21 Accepted:2024-04-08 Online:2024-04-12 Published:2024-04-10
  • Contact: Xinchun JI E-mail:jixc@aircas.ac.cn
  • Supported by:
    National Natural Science Foundation of China(42204048)

Abstract:

Geomagnetic matching positioning has the advantages of being passive, covert, and free from cumulative errors, showing broad prospects of application in the military field. The core of geomagnetic matching positioning is to determine the current position of the carrier by measuring the similarity between the measured geomagnetic field sequence and the target sequence in the geomagnetic reference map. However, existing criteria for geomagnetic matching similarity measurement do not fully consider the global and detailed features of the magnetic sequence, and are easily affected by magnetic field disturbances. To address these limitations, this paper proposes a Matrix Profile-Space (MP-S) criterion based on the Matrix Profile (MP) algorithm to achieve measurement of multi-scale cascading geomagnetic matching similarity. A Nearest Neighbor-Space (NN-S) function is constructed based on cascade detailed features and global space constraints, effectively filtering out incorrectly matched detailed features of magnetic sequences, thereby improving positioning accuracy and fault tolerance. Additionally, we design a lightweight 2D-Magnetic Light (2D-MLight) search and calculation strategy to address the complex computation issues of the MP algorithm, significantly reducing the runtime of the similarity measurement algorithm by avoiding redundant similarity calculations of adjacent target sequences. The processing results of geomagnetic data from a certain aircraft show that using the MP-S criterion for similarity measurement results in a horizontal positioning error of 48.6 m and a matching probability of 93.99%, outperforming the commonly used Mean Square-Difference (MSD) criterion. Furthermore, the lightweight search and calculation process of 2D-MLight can meet real-time positioning requirements, demonstrating good engineering application significance for improving the performance of magnetic matching positioning in complex scenarios with flat features and local disturbances.

Key words: geomagnetic matching positioning, similarity measurement, multi scale cascading, Matrix Profile algorithm, lightweight

CLC Number: