|
|
|
| Translation Compensation and Resolution of Multi-ballistic Targets in Midcourse |
| Hu Xiao-wei① Tong Ning-ning① Dong Hui-xu① Chu Hong-shuai② |
①(Air and Missile Defense College, Air Force Engineering University, Xi’an 710051, China)
②(Unit 95920 of PLA, Cangzhou 253801, China) |
|
|
|
|
Abstract Time-frequency image of multi-ballistic targets is composed of micro-Doppler of multi-targets with multi-scattering centers, which makes the methods for single target invalid. Firstly, micro-Doppler of precessing missile and swinging decoy is analyzed. Considering midcourse ballistic targets’ characteristics that the motion is stable and the acceleration is approximately a constant in short time, Radon transform is applied to the detection of linear degree of the micro-Doppler, then motional parameters are estimated based on minimum entropy criteria and Gauss fitting. After compensating translation, Viterbi algorithm is used to extract micro-Doppler from the time-frequency image, with which multi-targets can be resolved according to the principle that scattering centers on one target are with the same micro-Doppler cycles, but those on different targets are not. Finally, Simulations verify the effectiveness of the proposed method.
|
|
Received: 15 April 2014
|
|
|
|
Corresponding Authors:
Hu Xiao-wei
E-mail: 601237134@qq.com
|
|
|
|
|
|
|
2015, Vol. 37 
