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Sensors 2008, 8(5), 3056-3066; doi:10.3390/s8053056
Article

A Novel Modified Omega-K Algorithm for Synthetic Aperture Imaging Lidar through the Atmosphere

1,* , 1
, 2
 and 2
Received: 20 December 2007; Accepted: 14 April 2008 / Published: 6 May 2008
(This article belongs to the Special Issue Synthetic Aperture Radar (SAR))
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Abstract: The spatial resolution of a conventional imaging lidar system is constrained by the diffraction limit of the telescope’s aperture. The combination of the lidar and synthetic aperture (SA) processing techniques may overcome the diffraction limit and pave the way for a higher resolution air borne or space borne remote sensor. Regarding the lidar transmitting frequency modulation continuous-wave (FMCW) signal, the motion during the transmission of a sweep and the reception of the corresponding echo were expected to be one of the major problems. The given modified Omega-K algorithm takes the continuous motion into account, which can compensate for the Doppler shift induced by the continuous motion efficiently and azimuth ambiguity for the low pulse recurrence frequency limited by the tunable laser. And then, simulation of Phase Screen (PS) distorted by atmospheric turbulence following the von Karman spectrum by using Fourier Transform is implemented in order to simulate turbulence. Finally, the computer simulation shows the validity of the modified algorithm and if in the turbulence the synthetic aperture length does not exceed the similar coherence length of the atmosphere for SAIL, we can ignore the effect of the turbulence.
Keywords: Synthetic aperture; lidar; FMCW; Omega-K algorithm; phase screens; coherence length of atmosphere. Synthetic aperture; lidar; FMCW; Omega-K algorithm; phase screens; coherence length of atmosphere.
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Guo, L.; Xing, M.; Tang, Y.; Dan, J. A Novel Modified Omega-K Algorithm for Synthetic Aperture Imaging Lidar through the Atmosphere. Sensors 2008, 8, 3056-3066.

AMA Style

Guo L, Xing M, Tang Y, Dan J. A Novel Modified Omega-K Algorithm for Synthetic Aperture Imaging Lidar through the Atmosphere. Sensors. 2008; 8(5):3056-3066.

Chicago/Turabian Style

Guo, Liang; Xing, Mendao; Tang, Yu; Dan, Jing. 2008. "A Novel Modified Omega-K Algorithm for Synthetic Aperture Imaging Lidar through the Atmosphere." Sensors 8, no. 5: 3056-3066.


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