Residual translation compensations in radar target narrowband imaging based on trajectory information

2017 2nd International Conference on Reliability Engineering

Yue, Wenjue^1 ; Peng, Bo^1 ; Wei, Xizhang^1 ; Li, Xiang^1 ; Liao, Dongping^1

Research Institute of Space Electronics, National University of Defense Technology, Changsha, China^1

关键词: Accelerated motion;    Compensation precision;    Narrowband imaging;    Radar echo signals;    Scattering centers;    Signal-noise ratio;    Trajectory information;    Translation parameters;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/351/1/012018/pdf
DOI  :  10.1088/1757-899X/351/1/012018

来源: IOP

【 摘 要 】

High velocity translation will result in defocusing scattering centers in radar imaging. In this paper, we propose a Residual Translation Compensations (RTC) method based on target trajectory information to eliminate the translation effects in radar imaging. Translation could not be simply regarded as a uniformly accelerated motion in reality. So the prior knowledge of the target trajectory is introduced to enhance compensation precision. First we use the two-body orbit model to figure out the radial distance. Then, stepwise compensations are applied to eliminate residual propagation delay based on conjugate multiplication method. Finally, tomography is used to confirm the validity of the method. Compare with translation parameters estimation method based on the spectral peak of the conjugate multiplied signal, RTC method in this paper enjoys a better tomography result. When the Signal Noise Ratio (SNR) of the radar echo signal is 4dB, the scattering centers can also be extracted clearly.