| 摘要: |
| 为了提高雷达对微弱目标的检测能力，提出了一种多帧相参积累的检测前跟踪（TB
D）方法。通过对多帧时间内运动目标回波的分析，建立了相参积累的回波信号模型，其中
目标回波出现距离单元走动和多普勒单元走动。利用目标回波的空-时相关性，采用速度匹
配法和离散Chirp-Fourier变换（DCFT）联合估计目标径向速度、多普勒频率和调频斜率，
补偿距离单元走动和多普勒单元走动，实现多帧时间内目标能量的相参积累。最后，采用仿
真实验验证了信号模型的正确性和算法的有效性。 |
| 关键词: 相参雷达 检测前跟踪 相参积累 速度匹配 离散Chirp-Four
ier变换 |
| DOI： |
|
| 基金项目:四川省教育厅资助科研项目(07ZB140); 乐山师范学院科研项目(Z0820) |
|
| Track-before-detect Method Based on Coherent Integration during Multi scan |
| FAN Ling |
| (School of Physics and Electronic Engineering, Leshan Normal University,Lesha
n 614004,China;
School of Electronic Engineering, University of Electronic Science and Tech
nology of China,Chengdu 611731,China) |
| Abstract: |
| A coherent integration track-before-detect(TBD) method
is proposed to enhance the ability of detecting low signal-to-noise ratio(SNR)
tar
gets. Based on the analysis of the moving targets′ echoes during several succes
sive scans, the signal model for the coherent TBD is established, in which th
e targets echoes exhibit range cell migration and Doppler cell shift. By exploit
ing
the space-time correlation of the received echoes, a low-complexity power-effic
ient algorithm is proposed. By using velocity matching method and discrete Chirp
-Fourier transform(DCFT), the targets parameters such as target radial velocity,
Doppl
er frequency and chirp rate are jointly estimated to compensate range cell mi
gration and Doppler cell shift and realize coherent integration. Finally, simul
ation results show the validity of the signal model and the efficiency of the pr
oposed algorithm. |
| Key words: coherent radar track before detect(TBD) coherent integration velocity matching DCFT |
