標題: 你所不知道的雷射防護罩真相完全剖析
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你所不知道的雷射防護罩真相完全剖析

本文已獲原作者同意轉載$B:g.o$~5t:@+v1r
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2008-1-9 19:17
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;P2]4F2A6X0]7~2}最專業的反雷達測速器超級討論區最專業的反雷達測速器超級討論區6C;y+u%U6x9u
[ 本帖最後由 interceptor 於 2008-1-9 19:18 編輯 ]

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*{+j:p9C%@1z.p'A最專業的反雷達測速器超級討論區[ 本帖最後由 interceptor 於 2008-1-9 19:19 編輯 ]

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最近考慮要裝設中,好文阿!讓我瞭解了不少!

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(C*d7q;a;o7p行車紀錄器、測速器、電子偵測、雷射防護罩、GPS行車影像記錄器、GPS測速、汽車雷達、測速照相、南極星、征服者、至尊、V1、情聖一號、復國者、全頻雷達測速器、雷射測速!^+T7w2_"S4}&A
[ 本帖最後由 interceptor 於 2008-1-11 02:27 編輯 ]

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轉貼相關原文

Most police laser is 904/905nm infrared laser. The laser diode used in the guns is commonly around 50 Watts peak power, though could be more or less.
$T2~9}.[.R:d最專業的反雷達測速器超級討論區
0i6a,X9n7m)}9H'r(u"LED" jammers usually use 8 infrared LED's per transponder. These LEDs are commonly at 870nm, and can jam the 904/905nm guns because they're close enough that they will still be received by the laser guns, and the LEDs also emit closer to 904/905 when they heat up. A transponder using several LEDs will still have much less power than a transponder using laser diodes. www.s-star.com.tw6Q8[0W)g$r0e%@,j+e)V

%k1Q8L6a.])X(Q1rwww.s-star.com.tw"Laser Diode Jammers" usually use one laser diode per transponder, though recently some jammer makers have made designs with two laser diodes per transponder. These laser diodes are 904/905nm with 10-100 Watts peak power, depending on the jammer. It is important to note that the jammers do not usually use optics to the extent that the laser guns do in order to collimate the beam, thus the jammer beams spreads out more to ensure wide coverage. %{$P3l"D.H,Z(y/R.\2B;[&j
$W+@6t"u&s'P3c
As far as how the guns are jammed, it works like so: 最專業的反雷達測速器超級討論區 V;r9z$_3r1T-Y
7f2u&O,O2A6i(y J2}
The laser guns are "gated", which means that they'll only accept a pulse and use it for speed calculations when they're expecting to receive a pulse. The guns are only expecting to receive a pulse betwen the time it sends out it's pulse, and before that pulse is reflected back. Any jamming pulses must be received in this time window too, in order to have any effect. Once the gun's own pulse is reflected back, all bets are off: the gun uses it's own reflected pulse for calculations, and doesn't accept any pulses until it sends out another pulse. 行車紀錄器、測速器、電子偵測、雷射防護罩、GPS行車影像記錄器、GPS測速、汽車雷達、測速照相、南極星、征服者、至尊、V1、情聖一號、復國者、全頻雷達測速器、雷射測速0Y&@/j/["n4U

)Y7{5\)X5I/SFor example, a Kustom ProLaser III sends out 200 pulses per second, or one pulse every 5000 microseconds. At 1000 feet, the "time of flight" of the gun's pulse is 2 microseconds (about 1 foot per nanosecond for total travel of 2000 feet). So, any jamming pulses must be received by the gun in that 2 microsecond window. If a jamming pulse reaches the gun during the next 4998 microseconds, it has no effect at all and is essentially ignored by the gun. Then, the cycle repeats for the next pulse. 行車紀錄器、測速器、電子偵測、雷射防護罩、GPS行車影像記錄器、GPS測速、汽車雷達、測速照相、南極星、征服者、至尊、V1、情聖一號、復國者、全頻雷達測速器、雷射測速1Y0Q#Q1v(}7f
,j)H.Z3t)E:\3q
How do the jammers get a pulse into this narrow time window? The jammers receive a few of the laser gun's pulses, and time between them. Then, they are able to "predict" when the next pulse from the gun will be received at the jammer. A number of nanoseconds before the predicted pulse is expected to be received, they send out one or more jamming pulse(s). This ensures that a jamming pulse is received at the gun before the gun's own reflected pulse is, and is during the time window where the gun will accept a pulse and use it for speed calculation. Since the jamming pulse makes it back to the gun first, the gun's own reflected pulse is ignored.
&X;i/|6X8H;a:l3w*R
'M5S:j%\3q9r4^最專業的反雷達測速器超級討論區Jammers recognise individual guns based on the pulse rate, this is called using a "look up table". With a look up table, jamming can be customized for the specific laser guns. This is done so that pulse timing can be custom-tailored for each laser gun, for optimal jamming and avoiding jam codes. In addition to a "look up table", some jammers use a default algorithm to attempt to jam unrecognised guns. Not all jammers use a default algorithm. $?!h)f1{;s

-Z6q$h'D;X2hThe laser guns generally need 30-60 consistent pulses in order for a speed reading to be displayed. In general, the pulse timing in the time window can varied slightly for each pulse. This varies enough so that they do not correspond to any speed, so no speed is displayed. But other techniques might also be used, such as discussed below. www.s-star.com.tw1[+W6o;L8^3Q+j

!p"d(S5V.G5Y8P!I'U3`行車紀錄器、測速器、電子偵測、雷射防護罩、GPS行車影像記錄器、GPS測速、汽車雷達、測速照相、南極星、征服者、至尊、V1、情聖一號、復國者、全頻雷達測速器、雷射測速As for avoiding jam codes: the guns use different schemes to detect jamming. In order to attempt to avoid jam codes, a few different techniques are used, such as precisely timing jamming pulses in the time window to fake conditions which might be present during regular targeting. These conditions might cause other operational error codes to appear on the gun, but codes which do not indicate jamming. Another method might be to limit pulse amplitude in certain situations.
.l!H5R$S;|*~2]$m,W1Fwww.s-star.com.tw
/C8f(@*S/W.r)l)P行車紀錄器、測速器、電子偵測、雷射防護罩、GPS行車影像記錄器、GPS測速、汽車雷達、測速照相、南極星、征服者、至尊、V1、情聖一號、復國者、全頻雷達測速器、雷射測速There was an older jamming technique, used in the Lidatek LE-10 and Target LE-850. Instead of precisely timing jamming pulses with incoming pulse, these jammers first detect the laser, and then transmit jamming pulses at a very high frequency, generally 4 MHz. At this frequency, there is a pulse transmitted every 250 nanoseconds. This ensures that there will always be at least one jamming pulse which makes it into the time window for the gun, as long as the vehicle is about 125 feet away from the gun or further (light travels at about 1 foot per nanosecond, if the vehicle is 125 feet away the time of flight of the gun's pulse is 250 nanoseconds). This scheme should successfully jam all guns. But, there are some drawbacks. This scheme will definitely cause jam codes on the guns. And, the laser diodes are not rated to operate at 4 MHz, but jammer makers found that they could operate at this frequency for a very short time without burning up. So, jamming is only possible for a short period of time, generally a number of seconds. After that, the laser diode must cool before it can jam again.





GPS雷達雷射測速系統專業職人 裝機服務專線0912-994779   楊先生
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所以....我必須買 LI.....

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好像LI 8代才能保護周全ㄡ......





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看完這篇, 真的認識又更加深了! LI真的棒!

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QUOTE:
原帖由 iamted 於 2012-3-28 12:43 發表 #G&x5b'}3s4T)l5U%F
看完這篇, 真的認識又更加深了! LI真的棒!

8?0N5O"c U1k$V
睡覺也會夢見LI

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QUOTE:
原帖由 207 於 2012-3-28 13:44 發表 www.s-star.com.tw&E y3C&a#a/B5^

&o2@)W&Z5r*~睡覺也會夢見LI

(Y1Q*T-E!Q$b0q,@#V最專業的反雷達測速器超級討論區;j$r3H8H:y#i&D;B
沒錯~ 這周末就要迎接LI的到來! 滿心期待啊~~

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QUOTE:
原帖由 iamted 於 2012-3-28 13:46 發表
+p4P2k.h*}'a;[
/N.F7o+n7a,q最專業的反雷達測速器超級討論區
/_'v&D$L6X(?,_行車紀錄器、測速器、電子偵測、雷射防護罩、GPS行車影像記錄器、GPS測速、汽車雷達、測速照相、南極星、征服者、至尊、V1、情聖一號、復國者、全頻雷達測速器、雷射測速沒錯~ 這周末就要迎接LI的到來! 滿心期待啊~~

最專業的反雷達測速器超級討論區3z,v \7Z/D1z&Y1Q
是趁小楊董北上裝機路過嘉義時順便安裝嗎

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QUOTE:
原帖由 vwuser 於 2012-3-28 16:15 發表
4d,d+n1g3u-?+~8W(C行車紀錄器、測速器、電子偵測、雷射防護罩、GPS行車影像記錄器、GPS測速、汽車雷達、測速照相、南極星、征服者、至尊、V1、情聖一號、復國者、全頻雷達測速器、雷射測速
!h0x9].n;e9a#\,S#s是趁小楊董北上裝機路過嘉義時順便安裝嗎

0@'a$}$g"T:n5^;u/x
.\1?-Y6[&|:u
不是耶~ 小楊哥是禮拜六才要北上~%W%[4d6z'M"{:A,R5K,M$U
禮拜五小楊哥揪甘心耶! 願意跑一趟嘉義, 服務滿點!!!

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QUOTE:
原帖由 iamted 於 2012-3-28 18:11 發表
6o$}8E&Y6B/F#\!~*k行車紀錄器、測速器、電子偵測、雷射防護罩、GPS行車影像記錄器、GPS測速、汽車雷達、測速照相、南極星、征服者、至尊、V1、情聖一號、復國者、全頻雷達測速器、雷射測速最專業的反雷達測速器超級討論區 a/Y)L0z&]+@

1}7_"g6B(v,T不是耶~ 小楊哥是禮拜六才要北上~
(F%_4P3I-N+M#@禮拜五小楊哥揪甘心耶! 願意跑一趟嘉義, 服務滿點!!!

www.s-star.com.tw'O1G5r+x.O:[9u6z3e
那真的很甘心 (m3G'H1i1P/q/}.i4Y:v!e9}
有約時間地點嗎??,C9N%~;?-r Q(q#u3G
如果有空想順便過去玩槍

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