Is There a Minimum Distance for using Lidar?

Discussion in 'General Laser Jammer Discussion' started by Transporter, Dec 4, 2018.

  1. Transporter

    Transporter ModWight Transporter Intermediate User Premium Member

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    Had a Lidar encounter yesterday and now I am wondering if there is a minimum distance at which Lidar can be reliable used by Law Enforcement?

    There is a downhill section on Dunwoody Club Drive where a subdivision entrance is on the right side in a curve that is bending to the right. The Dunwoody PD was sitting in the subdivision entrance about 20 to 25 feet back from the intersection of Dunwoody Club. Since the road is down hill and curving in, he sees you before you can see him due to his being back away from the road. The LEO can see you when you are about 20 feet (A squared) from the subdivision entrance and with him back about 20 to 25 feet (B squared), the slant distance has to be about 26 to 32 feet give or take from the mean of 28 feet (C squared). Can TruSpeed S and Dragon clock and lock reliably given that short operational distance and increasing angle to perpendicular?

    Drawing it out on paper, it looks like the LEO has all of 5 to 8 feet before he can no longer hit the front tag, bumper, or headlight areas and would be shooting the side of the vehicle as one passed the entrance.
     
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  2. PY004

    PY004 Moderator Moderator Advanced User Premium Member

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    Both the DragonEye and TruSpeed S will not acquire a lock if any of the set of measurements it is using to compute the distance is less than 50 ft in speed mode.

    To put it in other words, 50 ft is the minimum distance for the DET and TSS
     
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  3. Transporter

    Transporter ModWight Transporter Intermediate User Premium Member

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    Thanks, so he is wasting his time because it is impossible to even remotely find a location at that spot where there is 40 feet much less 50 feet! The angle looked to be too great also. For a moment, I thought the ALP had falsed at first because I couldn't see any Lidar source and the car in front of me was just about 15 feet from the turn in when it Alerted (must have been splatter city all the way down the side of the vehicle in front of me). Then when I was about 5 feet from the turn in, I saw the LEO sitting back inside the subdivision entrance.

    I JTK'd it as if it mattered, but if I had been in the lead, it would have been JTG as nobody could react fast enough during that ambush to JTK before being well past.

    Again thanks for the info!
     
  4. PY004

    PY004 Moderator Moderator Advanced User Premium Member

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    If your distances are accurate, I don't know what he's sitting there shooting LIDAR. Unless he's just having fun shooting at random things.

    Did you actually confirm he was shooting LIDAR and you got hit?
     
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  5. Transporter

    Transporter ModWight Transporter Intermediate User Premium Member

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    ALP alerted. I saw him sitting about 20 feet back from the entrance, window down, arm out window holding Lidar Gun to his face. Does ALP keep a log I can get to of which gun we get hit by as I wasn't paying attention to the Gun ID. It was small so if I had to guess, TruSpeed S or a DragonEye Compact. Can't remember if it was being held vertical or horizontal.
     
    Last edited: Dec 6, 2018
  6. PY004

    PY004 Moderator Moderator Advanced User Premium Member

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    Pull the stat file and it'll tell you the last gun you got shot by.
     
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  7. Deacon

    Deacon TXCTG Advanced User Premium Member

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    50 feet is nothing. A young kid can throw a ball that far. It’s two one ton trucks nose to tail. You sure you’ve got the right numbers?
     
  8. mrdead72

    mrdead72 Learning to Fly Beginner User

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    Spose to be nomore then1000 ft i read a judge ruled on it
     
  9. Transporter

    Transporter ModWight Transporter Intermediate User Premium Member

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    I'm an engineer, the numbers are close enough for government work. The Dunwoody PD SUV was about a vehicle and 2/3s back from the entrance so 20 to 25 feet. No way he had more then 35 to 40 feet to work with no matter how soon he saw vehicles before they saw him.
     
  10. benzr

    benzr Been there done that !! Original V1 user !! Advanced User

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    THANKS FOR THE HEADS UP !!!
    I am rushing never speeding on that road at least 2-3 times a week to take my Mom out to lunch.
    Its been quite hard for her after losing my father last year and noe being handicapped as well. I try to fit her in and that is very enlightening !! .

    So i too am interested in the answers to op originsl question. THANKS in advance !

    Benzr


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  11. benzr

    benzr Been there done that !! Original V1 user !! Advanced User

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    I know that road very well he can target waay up that hill, as most ATL Leos do.

    Are you sure you didnt get scatter. ??

    That was my shortcut too .... d@mmnit.

    Benzr


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  12. Transporter

    Transporter ModWight Transporter Intermediate User Premium Member

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    I think you are thinking of the long hill toward GA400. This is the hill on the back far end before you go into Gwinnett County and dead end into Winter's Chapel. The subdivision is one of those jobs with the 8 foot high brick walls out front and the 30 year old mature trees and Leylands. I'll get the street next time by. With 78 roads named Peachtree, I stopped memorizing street names when I moved back to Atlanta. Where I grew up, the community guys all rode bikes everywhere so we knew every street name for 25 miles, then at 14 started riding motorcycles because we were old enough to get a street license so then it became 100 miles. Now I just know how to get there and couldn't tell you any side street names.

    The more I think about it, I am sure I got scatter and then was hit with the gun IE picking up scatter then traveling the 30 feet that separated the vehicle in front of me then direct hit. On that downhill I was probably 15 to 20 over, so if he wasn't jammed, there wasn't enough room to get a lock or he would have come after me.

    I thought it was bad enough with all the Dragons if I went east, then East Cherokee County getting TruSpeed S and ProLites, but now with Dunwoody right on top of the house and out on I-285, glad I pulled the trigger for both cars before getting popped by Lidar! I feel naked driving my daughters Toyota with just her V1. I am going to have to buy her a V1LE so I can at least have JBV1 with me. She will have to buy her own TMG!
     
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  13. benzr

    benzr Been there done that !! Original V1 user !! Advanced User

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    Yeah right you are correct !!!!!

    Lemme re-read so i know where to look.

    I might use him to test my ALPS and TMGs.

    NOW THAT IS THE PROPER USE OF A LEO !!!!

    Benzr


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  14. benzr

    benzr Been there done that !! Original V1 user !! Advanced User

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    Wow @Transporter We travel the EXACT SAME AREAS to the tee !!

    My GF is in the Cherokee Area. WATCH OUT FOR Low Power K Band ... the sheriffs cars whitish creme brown run it in Holley Springs Canton and Cherokee Counties !! Pro Lazer and Stalkers are very common in our areas.

    Was that LEO shooting a dragon in MY BACKYARD !!
    That is very disheartening. ... sigh. ☹️


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  15. Deacon

    Deacon TXCTG Advanced User Premium Member

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    He sounds like a complete doofus lol
     
  16. benzr

    benzr Been there done that !! Original V1 user !! Advanced User

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    Yeah ALL US SOUTHERNERS ARE DOOFUS' RIGHT ?? L0L


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  17. benzr

    benzr Been there done that !! Original V1 user !! Advanced User

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    Yet we stupid ignorant inbred southerners in purple sarcastic text !!
    Have the TOTAL CONTROL OF YOUR NORTHERN Pres ELECTIONS !!!!!
    Hahahahahahahaha.


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  18. modsl55amg

    modsl55amg "Jammin' 'Till Your GHz" Intermediate User Premium Member

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    @Transporter

    MINIMUM Ranges according to the Operator Manuals:

    DESL: Speed Mode 50 ft (15 m) Range Mode: 10 ft (3 m) Weather Mode: 250 ft (76 m)

    DETC: Speed Mode 50 ft (15 m) Range Mode: 15 ft (5 m) Weather Mode: 250 ft (76 m)

    TSS: Speed Mode 50 ft (15 m) Continuous Mode: 50 ft Weather Mode: 200 ft

    If the LEO was holding a LIDAR gun outside his window, with his arm extended, it is possible that it was a DESL, as he could have both looked thru the Head Up Display to target a vehicle and also viewed the speed/distance on the Rear Panel Display, at the same time. I doubt it was a DETC or a TSS, as they both have to be held up to a person's eye in order to be able to both target a vehicle and view the speed.
     
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  19. PY004

    PY004 Moderator Moderator Advanced User Premium Member

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    Are you sure ALP alerted? You sure it wasn't radar?
     
  20. Transporter

    Transporter ModWight Transporter Intermediate User Premium Member

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    I run V1 using JBV1 App with Laser turned off on V1. ALP alerted and I hit the volume button to JTK it. JBV1 and V1 were silent.
     

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