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Message
1
Posted on 1/26/23 at 8:51 am to Chad504boy
It's linked to the vehicles OBD2 system. Others have an internal GPS device. While driving the radar computer knows the speed the car It's in is traveling.
The ones you see cops pointing and aiming are laser detectors. In those they have to hit a reflective surface to get a signal. So those usually aren't used when driving.
The ones you see cops pointing and aiming are laser detectors. In those they have to hit a reflective surface to get a signal. So those usually aren't used when driving.
Posted on 1/26/23 at 8:52 am to Chromdome35
quote:
That or GPS, my phone and radar detector both use GPS to determine my vehicle speed, it matches what the speedometer of my car says.
Modern ones probably use GPS.
Older ones probably used the accelerometer reading.
Posted on 1/26/23 at 8:54 am to Napoleon
quote:
It's linked to the vehicles OBD2 system. Others have an internal GPS device. While driving the radar computer knows the speed the car It's in is traveling.
So random local sheriff on a motorbike, you think their radar gun they pull out is physically linked to the motorbike's system?
Posted on 1/26/23 at 8:56 am to Chad504boy
The radar is constantly measuring it's speed by measuring how fast object around it are moving. When it "locks on" a target that is moving faster or slower than those values it preforms a math calculation to figure out the speed.
Posted on 1/26/23 at 8:57 am to Chad504boy
quote:
So random local sheriff on a motorbike, you think their radar gun they pull out is physically linked to the motorbike's system?
That or it has built in GPS.
It's pretty much the only two ways it could know how fast it's going to perform the needed calculation.
You're getting irritated at us, but we have answered your question. Multiple times.
I have a blue tooth obd2 reader. It puts my accelerometer reading on my phone, so it could be done in some way like that too.
We have fricking 200 dollar drones flying around using GPS, you think this is that complicated?
This post was edited on 1/26/23 at 9:03 am
Posted on 1/26/23 at 9:00 am to NATidefan
quote:
You're getting irritated at us, but we have answered your question. Multiple times.
i'm not getting irritated. you insulted my math skills when you didn't know dick nor frick about shite.
Posted on 1/26/23 at 9:02 am to Chad504boy
quote:
you didn't know dick nor frick about shite.
Know alot more than you,
Posted on 1/26/23 at 9:04 am to NATidefan
quote:
Know alot more than you,
seriously doubt it.
Posted on 1/26/23 at 9:05 am to Chad504boy
Hand held gun? No.
Motorcycles unless BMW don't have an on board system.
Could have GPS though.
Motorcycles unless BMW don't have an on board system.
Could have GPS though.
Posted on 1/26/23 at 9:06 am to Chad504boy
quote:
The cop is on th motorbike radaring oncoming vehicle while driving at x speed. How is it possible that an oncoming motorcycle at you is reading an accurate measurement when they themselves are moving at x miles an hour towards an object moving towards them at x mph?
If you’re planning on using this as your defense at the upcoming hearing on your speeding ticket, please do us all a favor and have someone there recording it so we can see the judge’s reaction.
And make sure they don’t hold their phone upright.
TIA.
This post was edited on 1/26/23 at 9:07 am
Posted on 1/26/23 at 10:05 am to Chad504boy
We’re on the verge of creating true AI, place complex machinery in orbit, have developed assassin drone that are controlled from 1,000’s of miles away, and you wonder if we can develop a radar speed detector that can be accurate while moving?
Posted on 1/26/23 at 10:35 am to Chad504boy
Posted on 1/26/23 at 10:51 am to Chad504boy
I know that some radars have “stationary” mode and “moving” mode. The cops that are sitting still are in stationary mode (unless ton see them aiming a laser gun, laser guns don’t have a moving mode).
When they are in motion they switch to moving mode. If their radar is on, and there are no oncoming cars, the radar shows the speed of the patrol car (in a window on the radar saying “patrol speed”, as someone mentioned by reading the radar signal coming back off stationary objects. When a car is approaching the radar does the math and a speed shows up in the “target speed” window.
Some radars can check the speed of a car going on the same direction as the patrol car, but you have to put the radar in that mode so the radar can do the math.
It’s all about the Doppler effect.
When they are in motion they switch to moving mode. If their radar is on, and there are no oncoming cars, the radar shows the speed of the patrol car (in a window on the radar saying “patrol speed”, as someone mentioned by reading the radar signal coming back off stationary objects. When a car is approaching the radar does the math and a speed shows up in the “target speed” window.
Some radars can check the speed of a car going on the same direction as the patrol car, but you have to put the radar in that mode so the radar can do the math.
It’s all about the Doppler effect.
Posted on 1/26/23 at 11:29 am to Putty
Unless the cops have an advanced version of Synthetic Aperture Radar, I would suspect the radar reading would be less than optimal.
Posted on 1/26/23 at 11:33 am to Chad504boy
I have seen some stupid questions on this website, but this is towards the top.
Posted on 1/26/23 at 11:33 am to NATidefan
quote:
The radar knows how fast the cops motorcycle is going. Then using math it calculates the other vehicle's speed.
as long as we're not trusting the cops to do mental math
This post was edited on 1/26/23 at 11:34 am
Posted on 1/26/23 at 11:56 am to Chad504boy
When I was working with a communications company, we had to install redar detectors in LE vehicles. The way we calibrated them was with a set of tuning forks which would vibrate at a frequency corresponding to a speed stamped on the fork.
Posted on 1/26/23 at 11:58 am to Chad504boy
It is set to the speed limit of the road on which he is running radar. He has to drive at the speed limit to register accurate reading of the oncoming lanes of traffic.
Posted on 1/26/23 at 12:04 pm to Chad504boy
quote:
how?
It's called the doppler shift.
Most radar guns are FMCW (frequency modulated continuous wave) radars which allow the host to detect range as well as velocity.
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