Journal of Xidian University ›› 2019, Vol. 46 ›› Issue (2): 23-28.doi: 10.19665/j.issn1001-2400.2019.02.005

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Array thermal deformation error calibration method for spaceborne radar

HUO Lihuan1,LIAO Guisheng1,2,YANG Zhiwei1,2,XIN Jinlong1   

  1. 1. National Key Lab. of Radar Signal Processing, Xidian Univ., Xi’an 710071, China
    2. Collaborative Innovation Center of Information Sensing and Understanding, Xidian Univ., Xi’an 710071, China
  • Received:2018-08-12 Online:2019-04-20 Published:2019-04-20

Abstract:

In order to improve the accuracy of the thermal deformation error estimation for spaceborne phased arrays, an array error estimation method is proposed which combines the measurement and the signal processing. In the proposed method, the deformation order and initial positions are obtained from the measurement. Then the echo data can be obtained from the range-Doppler images. The optimization model is established based on the deformation characteristics. The sensor positions can be corrected with high accuracy in the iteration. Several simulated results show that the proposed method can obtain estimation better than one-fifteenth the wavelength and is still robust under the large deformation error condition. The array pattern is compensated well in the simulation.

Key words: spaceborne radar, thermal deformation, calibration.

CLC Number: 

  • TN958.92