[Suf Daddy]

SJ:

LIDAR is only as accurate as the distance info the return pulses "give" to the Rx of the LIDAR gun.

The next step is the never discussed "error trapping software" algorithm is next supposed to decide whether the return distances applied to a least squares formula (applied to a sloped line) are "valid".

Here's the problem:

In instant ON, there is NO TRACKING HISTORY, so the first 40 pulses to determine if the object is moving or not has no data to compare to. Here's where most of the errors come into play IMHO.

This is further compounded by the operators manual specifically stating that the operator is to aim and follow one specific target on a vehicle during the entire process...........this on a sloped object moving 88 feet per second @ 60 MPH. This poster claims it was dark. So how good is the aim?

The feedback of the LTI guns is POOR compared to most other guns.
MA uses these extensively, unless its on the MAss Pike so then its Laser Atlanta, but either way the operator is responsible for the accuracy of the unit in their operating it.

Most guns have a dot which doesn't represent the size of the beam it projects.....then you have another vehicle in this example.

Where is the distance info during this clocking?

Its NOT in the LTI HUD, just the speed reading is, which is calculated from the return pulses which in LIDAR, ONLY calculate distance.

Throw this in with the question of where on this vehicle the beam was aimed at, and WHICH of the three beams was reflected back to the unit.
NOBODY can answer THAT question, so there is a problem with how a LIDAR gun collects its data.

RANGE, aim, situation, environment, officers' operation ALL influence the output of a calculated speed reading in ANY LIDAR gun at ANY time.

ADDITIONALLY:
the gun can only display (and consider valid) ANY reading calculation which is within its threshold to display a speed. E.G: 5 MPH - 200 MPH.

ANY smooth data return to the Rx which falls in that category and isn't a jerked / broken data stream / will satisfy the method of least squares projection upon a sloped line graph and calculate a speed.

Its WHY I or anyone with smooth panning / sweep or just jiters from long range aim or vibrations can get readings off pavement, walls, sides of cars and any other return source of variable depths.............

Its why in my demonstrations this past weekend (using a Stalker LIDAR because of its "audio tones" )I was able to get 47MPH off parking lot pavement and a myriad of lower reading off vehicles and other objects.

-Suf Daddy

="stealthJamal"]Laser guns are dead accurate. You were definately doing that speed unless the officer targetted another car to get that reading and then lied saying it was you. Are you saying the officer is lying?