Breaking News
Comments
Newest First | Oldest First | Threaded View
Esperanto
User Rank
Rookie
re: Radar basics – Part 5: synthetic aperture radar
Esperanto   4/22/2013 12:37:01 PM
NO RATINGS
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
User Rank
Rookie
re: Radar basics – Part 5: synthetic aperture radar
txaggie88   4/19/2013 2:54:10 AM
NO RATINGS
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
User Rank
Rookie
re: Radar basics – Part 5: synthetic aperture radar
Michael Parker   1/16/2012 6:12:19 AM
NO RATINGS
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
User Rank
Rookie
re: Radar basics – Part 5: synthetic aperture radar
jlgarry   1/13/2012 3:28:43 AM
NO RATINGS
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
User Rank
Rookie
re: Radar basics – Part 5: synthetic aperture radar
hongzhou   8/25/2011 7:30:37 AM
NO RATINGS
Like

Technocloud
User Rank
Rookie
re: Radar basics – Part 5: synthetic aperture radar
Technocloud   7/23/2011 4:58:30 AM
NO RATINGS
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
User Rank
Rookie
re: Radar basics – Part 5: synthetic aperture radar
EREBUS0   7/22/2011 8:20:19 PM
NO RATINGS
I agree. Very well done. Thank you.

Postlethwait
User Rank
Rookie
re: Radar basics – Part 5: synthetic aperture radar
Postlethwait   7/21/2011 3:04:00 PM
NO RATINGS
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
User Rank
Blogger
re: Radar basics – Part 5: synthetic aperture radar
Max The Magnificent   7/18/2011 7:29:58 PM
NO RATINGS
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.



EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Max Maxfield

Steve Wozniak Reacts to Latest iPhone
Max Maxfield
9 comments
Funnily enough, just a few days ago as I pen these words, I was chatting with my wife (Gina the Gorgeous) when she informed me that -- as a kid -- she had never played at making a ...

EDN Staff

11 Summer Vacation Spots for Engineers
EDN Staff
20 comments
This collection of places from technology history, museums, and modern marvels is a roadmap for an engineering adventure that will take you around the world. Here are just a few spots ...

Glen Chenier

Engineers Solve Analog/Digital Problem, Invent Creative Expletives
Glen Chenier
15 comments
- An analog engineer and a digital engineer join forces, use their respective skills, and pull a few bunnies out of a hat to troubleshoot a system with which they are completely ...

Larry Desjardin

Engineers Should Study Finance: 5 Reasons Why
Larry Desjardin
46 comments
I'm a big proponent of engineers learning financial basics. Why? Because engineers are making decisions all the time, in multiple ways. Having a good financial understanding guides these ...

Flash Poll
Top Comments of the Week
Like Us on Facebook
EE Times on Twitter
EE Times Twitter Feed

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)