PMID- 31726674
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20191118
LR  - 20200108
IS  - 1424-8220 (Electronic)
IS  - 1424-8220 (Linking)
VI  - 19
IP  - 22
DP  - 2019 Nov 12
TI  - Analysis of the Azimuth Ambiguity and Imaging Area Restriction for Circular SAR 
      Based on the Back-Projection Algorithm.
LID - 10.3390/s19224920 [doi]
LID - 4920
AB  - Circular synthetic aperture radar (CSAR) has a 360 degrees  observation capability on the 
      central observation scenario. A typical way to process CSAR imaging is to cut 
      data into small sub-apertures because most targets are only coherent at a very 
      small observation angle. There are many sub-aperture imaging methods after 
      development in recent years. The back-projection algorithm is widely used because 
      it is simple and can be applied to an arbitrary trajectory. Because of the 
      limitation of the Nyquist sampling frequency and influence of the antenna 
      sidelobe, azimuth ambiguity is a phenomenon that may occur in the radar imaging 
      process. The existing researches typically choose the back-projection (BP) 
      imaging area according to the SAR platform flight path and the antenna beam 
      width. The limitation of the CSAR imaging area and its azimuth ambiguity region 
      are rarely analyzed theoretically. This paper focus on the sub-aperture imaging 
      of CSAR, based on the BP algorithm, which derives the relationship of azimuth 
      ambiguity with CSAR parameters such as the pause repeat frequency (PRF), slant 
      range angle, velocity of radar platform, etc. This paper proposes an equation for 
      the calculation of the azimuth ambiguity region and analyzes the limitations, 
      which provides theoretical support for CSAR parameter design, imaging area 
      selection, and azimuth ambiguity analysis.
FAU - Du, Bang
AU  - Du B
AUID- ORCID: 0000-0002-4145-9147
AD  - Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 
      100094, China.
AD  - School of Electronic, Electrical and Communication Engineering, University of 
      Chinese Academy of Sciences, Beijing 100049, China.
AD  - Key Laboratory of Technology in Geo-spatial Information Processing and 
      Application Systems, Chinese Academic of Science, Beijing 100190, China.
AD  - Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China.
FAU - Qiu, Xiaolan
AU  - Qiu X
AUID- ORCID: 0000-0002-8517-3415
AD  - Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 
      100094, China.
AD  - Key Laboratory of Technology in Geo-spatial Information Processing and 
      Application Systems, Chinese Academic of Science, Beijing 100190, China.
AD  - Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China.
FAU - Huang, Lijia
AU  - Huang L
AD  - Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 
      100094, China.
AD  - Key Laboratory of Technology in Geo-spatial Information Processing and 
      Application Systems, Chinese Academic of Science, Beijing 100190, China.
AD  - Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China.
FAU - Lei, Songlin
AU  - Lei S
AD  - Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 
      100094, China.
AD  - School of Electronic, Electrical and Communication Engineering, University of 
      Chinese Academy of Sciences, Beijing 100049, China.
AD  - Key Laboratory of Technology in Geo-spatial Information Processing and 
      Application Systems, Chinese Academic of Science, Beijing 100190, China.
AD  - Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China.
FAU - Lei, Bin
AU  - Lei B
AD  - Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 
      100094, China.
AD  - Key Laboratory of Technology in Geo-spatial Information Processing and 
      Application Systems, Chinese Academic of Science, Beijing 100190, China.
AD  - Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China.
FAU - Ding, Chibiao
AU  - Ding C
AD  - Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 
      100094, China.
AD  - Key Laboratory of Technology in Geo-spatial Information Processing and 
      Application Systems, Chinese Academic of Science, Beijing 100190, China.
AD  - Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China.
LA  - eng
GR  - 61331017/National Natural Science Foundation of China/
PT  - Journal Article
DEP - 20191112
PL  - Switzerland
TA  - Sensors (Basel)
JT  - Sensors (Basel, Switzerland)
JID - 101204366
SB  - IM
PMC - PMC6891759
OTO - NOTNLM
OT  - BP algorithm
OT  - azimuth ambiguity
OT  - circular SAR
OT  - synthetic aperture radar imaging
COIS- The authors declare no conflict of interest.
EDAT- 2019/11/16 06:00
MHDA- 2019/11/16 06:01
PMCR- 2019/11/01
CRDT- 2019/11/16 06:00
PHST- 2019/10/07 00:00 [received]
PHST- 2019/10/30 00:00 [revised]
PHST- 2019/11/09 00:00 [accepted]
PHST- 2019/11/16 06:00 [entrez]
PHST- 2019/11/16 06:00 [pubmed]
PHST- 2019/11/16 06:01 [medline]
PHST- 2019/11/01 00:00 [pmc-release]
AID - s19224920 [pii]
AID - sensors-19-04920 [pii]
AID - 10.3390/s19224920 [doi]
PST - epublish
SO  - Sensors (Basel). 2019 Nov 12;19(22):4920. doi: 10.3390/s19224920.