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  1. #1
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    Default GOL : Suggestion : Acquisition Distance For Each Gun

    Test Methodology

    The test vehicle was driven towards the radar source very slowly, and determined the point of first detection by the radar detector.
    http://www.guysoflidar.com/testjan06.html
    First , Félicitations to Gol , the results are clear , spacy , an exemple to

    clarity.

    What would be interesting to know on your next shoot out is the first distance of acquisition of the target speed , using the same vehicule so to have an equal target cross section.

  2. #2
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    line of site

  3. #3
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    Sethy ,


    What I mean is this : at the very moment the detector sets off , the police gun should not show yet the target's speed . The radar waves have to return to the gun , and this is the difference that I would like Gol checks next time .

    The returned waves have to be strong enough to be read , analysed and displayed the speed.

    As an exemple : in the 33.8 gig the RX-65 (ES13Raven) USA detected the MPH enforcer gun at 1742 feet : my question : did the gun showed the speed of the car exactely at this distance ?

    This is called ''acquisition distance of target '' which is different than the alerting distance of the rd .

    Unless the distances are so short that it does not make a difference between those two figures ....

    Prof Jim , can you sort this out for us ?

  4. #4
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    I believe radar can get a reading pretty dam far away. Weather or not it is practical and legal is another story, basicly not unless you are the only car on a stright desert highway road, but that still leaves out the officers responsibility to estimate approaching speed etc.

    I believe what your asking is a performance testing comparison of the radar gun verses a radar detector alerting, comparing the distance.

  5. #5
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    Quote Originally Posted by 411radarlover
    Prof Jim , can you sort this out for us ?
    At the latest test, to make it difficult for the detector, the radar vehicle was at such a steep angle that for all practical purposes no speed could be acquired by the radar at all. Had we set up the radar gun straight down the line so that a speed could easily be acquired, the detectors would have alerted many times the length of our test course.

    In my personal opinion, I don't think that the distance at which the radar acquired the speed of the vehicle is practical to include with radar detector tests:

    In a constant-on situation, any detector should be able to warn you at many times the distance at which the radar can acquire a speed. For the radar gun, the signal has to travel to the target vehicle and then back to the gun. For the detector, the signal only needs to travel half the distance. On a straight line-of-sight course, even the cheapest budget model radar detectors are capable of alerting to the radar at many times the distance at which the speed can be acquired on the radar gun. On long straight courses, detection distances of 5+ miles are common, and 10+ miles are not unheard of. It would be a poor radar detector indeed that could not provide enough warning. In the old days, before superhetrodyne detectors, having enough time to slow down before a speed reading might have been a real issue. Not so anymore.

    Although almost any detector would provide enough warning in a constant-on situation, it is still important to have a very sensitive detector, in order to detect instant-on hitting traffic ahead of you.

    Maybe sometime in the future if we have some extra time, it might be interesting to see what the target range of the different radar units is against different vehicles.

    Jim

  6. #6
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    Big truck + RMR = uh oh

  7. #7
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    it might be interesting to see what the target range of the different radar units is against different vehicles.
    Thanks a lot Jim , U are the Merrill Skolnik of this forum.

    and may I twist your answer : it might be interesting to see what the target range of the different radar units is against same vehicles.

  8. #8
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    For reference, here's some tests from way back in 1979(!) on different vehicles against a Kustom KR-11. Results are in feet...



  9. #9
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    Jim , too bad this link is broken .

    I found this : Radar Range Equation

    Radar cross section (s) is affected by
    Target size
    Target aspect
    Material
    Shape
    Carrier frequency

    http://www.fas.org/man/dod-101/navy/...-1/tsld048.htm

    For those who wants to learn more :

  10. #10
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    No wonder the Vette is so popular!

    A radar range test would be an excellent idea, since the one in Car and Driver is so old. Testing different vehicles against the same radar would give a good idea of the vehicle's radar profile. And Jimbonzzz, be sure and include your WS6 in the test. You will be surprised by the results, at least on Ka band from the front! It would be interesting so see how it does against K band too. I never did get to test K band against my TA.

    GTO_04

 

 

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