Hi and watch out for the freeway fixed radar!! - Page 3 - Perth-WRX.com

Mungus01 · #21 22-12-2011, 05:06 PM

Thanks for all the updates guys, my toys in the car tell me that the radar is a "Poliscan" unit when I drive past.

reconus · #22 22-12-2011, 05:19 PM

Pretty sure it was mentioned somewhere that it was a poliscan unit. think maybe in the other thread.

GTB Liberty · #23 22-12-2011, 05:21 PM

It's a Poliscan.

No revenue raising at all here either ... 20000 by a minimum of $75 per fine equals 1.5 Million in days???

Spektre · #24 22-12-2011, 06:41 PM

Quote:

Originally Posted by Rossco

As long as it has locked on to a minimum of 4 satellites (most see 8 - 12) it is more accurate. all good units (navman, Tomtom & Garmin) use doppler (frequency) shift for speed & time shift for lat/long location & not way points.

lat/long accuracy is irrelevant, the system uses a totally different method to calculate speed over ground.

"GPS receivers typically calculate velocity by measuring the frequency shift (Doppler shift) of the GPS D-band carrier(s).

Velocity measured by a GPS is inherently 3 dimension, but consumer GPS receivers only report 2D (horizontal) speed on their readout. Garmin's specifications quote 0.1mph accuracy but due to signal degredation problems noted above, perhaps 0.5mph accuracy in typical automobile applications would be what you can count on."

.5 mph = 0.804672 kph pretty accurate no?

Most GPS receivers used for navigation only use the L1 phase carrier band and actually used a predictive algorithm to predict speed, direction and routes...

I wouldn't trust GPS receivers for accurate speed checking.

If in doubt, go get your speedo calibrated.

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tuna · #25 13-01-2012, 08:17 AM

Gunman shoots freeway camera - The West Australian

huggy_b · #26 13-01-2012, 08:27 AM

Quote:

Originally Posted by tuna

Gunman shoots freeway camera - The West Australian

I just read that this morning - beggars belief why you would bother? You just know there will be a camera watching the camera, so they would probably have a plate number or at least a description of the car which they can then review footage from further down the freeway with any number of cameras they have pointed at the road. And even after shooting it, it was still operational? Talk about maximum effort for no reward.

American Dave · #27 13-01-2012, 08:52 AM

LOL it was only a matter of time...should have used a hand grenade FFS

reconus · #28 13-01-2012, 08:57 AM

lmao. what an idiot. there's a CCTV camera that covers that entire bend. Unless it was mark whalberg.