J4 ›› 2013, Vol. 40 ›› Issue (3): 152-159.doi: 10.3969/j.issn.1001-2400.2013.03.023

• Original Articles • Previous Articles     Next Articles

Imaging method of airborne downward-looking 3D-MIMO-SAR  with alternate-transmitting mode

HUANG Xuhua1,3;LI Xiangjun2;FANG Yihong1   

  1. (1. The Institute of Air Defense and Anti-missile, Air Force Engineering Univ., Xi'an  710000, China;
    2. Unit 93942 of PLA, Xianyang  712000, China;
    3. Unit 95037 of PLA, Wuhan  430073, China)
  • Received:2012-01-09 Online:2013-06-20 Published:2013-07-29
  • Contact: HUANG Xuhua E-mail:huangxuhua_101@163.com

Abstract:

By study of the problem of three-dimensional (3D) imaging method of linear arrays synthetic aperture radar (LA-SAR), the conventional LA-SAR with a single transmitting antenna requires a number of receiving antennas to meet the requirement of the spatial sampling rate, which is difficult to implement. To solve the problem, a novel imaging method of down-looking 3D-MIMO-SAR based on the alternate-transmitting mode is proposed. Firstly, the 3-D echo signal model based on the alternate transmitting mode is analyzed. Then by combining equivalent phase center theory and beam-forming technology, the imaging method of downward-looking 3D-MIMO-SAR is put forward in detail, which can cut down the number of antennas significantly, improve the spatial efficiency of the radar platform and reduce the difficulty of project implementation. Finally, the effectiveness of this algorithm is validated by the simulation results.

Key words: multy input multy output radar, synthetic aperture radar imaging, downward-looking 3-D imaging, equivalent phase center

CLC Number: 

  • TN957