Paper Info
Title
System distortion analysis and compensation of DIFS signals for wideband imaging radar.
Abstract
System distortion is inevitable in wideband imaging radar, which needs to be compensated precisely. In traditional wideband imaging radar for space surveillance, a linear frequency modulation signal is transmitted and the echoed signal is received with dechirping processing. In this case, the system distortion changes with the target range, making it hard to compensate the distortion. However, the direct intermediate frequency sampling (DIFS) signal maintains the complete system distortion and avoids the range variant distortion in the dechirped signal. Therefore, it is more convenient to perform system compensation in DIFS signal. In this paper, the distortion factors affecting the wideband radar systems are introduced. Then, the influence of the amplitude phase distortion on the focusing quality is analyzed in detail. Finally, a system compensation method in the frequency domain based on least squares estimation is proposed. In the proposed method, the compensation vectors are extracted from the calibration tower echoes for DIFS compensation. Inverse synthetic aperture radar imagery of targets can be achieved with improved focus quality. Simulations and real-data experiments confirm the effectiveness of the proposal.
Year
DOI
Venue
2015
10.1007/s11432-014-5252-z
SCIENCE CHINA Information Sciences
Keywords
Field
DocType
system distortion, direct intermediate frequency sampling (DIFS), system compensation, least squares estimation (LSE), wideband imaging radar, 系统失真, 直接中频采集, 系统补偿, 最小二乘估计, 宽带成像雷达, 020304
Frequency domain,Wideband,Radar imaging,Telecommunications,Intermediate frequency,Control theory,Electronic engineering,Inverse synthetic aperture radar,Phase distortion,Frequency modulation,Distortion,Mathematics
Journal
Volume
Issue
ISSN
58
2
1869-1919
Citations 
PageRank 
References 
1
0.40
6
Authors
4
Name
Order
Citations
PageRank
Yang Liu161.16
Qingkai Hou230.77
Shiyou Xu3185.29
Biao Tian461.50