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Esperanto
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re: Radar basics – Part 5: synthetic aperture radar
Esperanto   4/22/2013 12:37:01 PM
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Thank you very muche for this clear and simple but very instructive series of articles. It heleped me to uquickly recover years of technology advances since I left RADARS back in 1980's. Gianni

txaggie88
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re: Radar basics – Part 5: synthetic aperture radar
txaggie88   4/19/2013 2:54:10 AM
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Awesome series of articles for someone who has zero hands-on DSP experience. Could you write up Part 6 for us and explain what Inverse SAR is at about the same technical level?

Michael Parker
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re: Radar basics – Part 5: synthetic aperture radar
Michael Parker   1/16/2012 6:12:19 AM
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Thank you for your comment and catching this. I appreciate the correction of “Fdoppler=2*velocity*sin(theta)/wavelength” and will check up on the length required for SAR in the reference you listed. The intention is to keep the explanations fairly high level and intuitive, so I did not try to go into the frequency domain options for implementation. The radar texts do a better job in this regard. I am glad it was of use to you, in despite of the fact you sound pretty knowledgeable in this area. I am hoping to publish and present a paper on a high performance radar algorithm at RadarCon, if the results work out well. Best regards, Michael Parker

jlgarry
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re: Radar basics – Part 5: synthetic aperture radar
jlgarry   1/13/2012 3:28:43 AM
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Great Radar and SAR Overview - However, I would like to make note of a couple slight inaccuracies in this section of the text. First, upon performing the calculations for the resolvable distance of the radar system, the author claims that the path traversed by the SAR system must be twice that of a real antenna length to achieve similar performance in the azimuth domain. However, this is actually the opposite effect of the two-way propagation nature of SAR. Evidence of this can be found in "Understanding Radar Systems," by Kingsley & Quegan. I would also like to highlight the fact that the section entitled "SAR Processing" details a method of correlation. Although the procedure implemented in the explanation is the most straight-forward approach and the best visual aid in the calculation, this may also be performed in the frequency domain. This allows the traditional approach, as well as the Doppler SAR approach, to capitalize on the efficiency of the FFT. Lastly, in the section for SAR Doppler processing, the doppler shift is also twice that of normal, one-way systems (comm. systems, for example). An accurate approximation for the doppler shift is actually Fdoppler=2*velocity*sin(theta)/wavelength. Derivations for this expression can be found in the an edition of Skolnik's Radar Systems books. Overall, this is a great series and has been a good supplement to my foray into the radar world. Thanks for your contribution and I look forward to any other articles you publish!

hongzhou
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re: Radar basics – Part 5: synthetic aperture radar
hongzhou   8/25/2011 7:30:37 AM
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Like

Technocloud
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re: Radar basics – Part 5: synthetic aperture radar
Technocloud   7/23/2011 4:58:30 AM
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Very well done. Is it possible to obtain permission to use excepts as part of a piece I am writing on Direction Finding from basics to modern techniques?

EREBUS0
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re: Radar basics – Part 5: synthetic aperture radar
EREBUS0   7/22/2011 8:20:19 PM
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I agree. Very well done. Thank you.

Postlethwait
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re: Radar basics – Part 5: synthetic aperture radar
Postlethwait   7/21/2011 3:04:00 PM
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Excellent distillation for technical non-specialists, this series has infused a little knowledge into some terms that I'd always wanted to understand better.

Max The Magnificent
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re: Radar basics – Part 5: synthetic aperture radar
Max The Magnificent   7/18/2011 7:29:58 PM
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Well, as far as I'm concerned this has been a very informative series of articles -- thank you Michael for taking the time to pull all of this together.



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