so when are the yanks/japs going to unveil the stealth sprotbike?
GSX117R?
There's always going to be something perpendicular to the waveform for a signal to return, albeit a weak one. I don't think the waveform is square either (althought the newer digital ones might be), so part of it will always be perpendicular to the target also.
That would likely have been with the older 50mW Hawk units - how long ago?. The reason for the low reading may have been what is referred to as the COSINE effect (the adjacent side of the vector triangle is registered speed - finally all those hours of high school trigonometry pays off lol) because the target direction is not accounted for in the mircowave units, so unless you're moving directly towards the unit your speed will register low (advantage target!). Although it may have just not acquired a lockable signal fast enough, because that speed difference would have required quite a significant angle to the patrol direction.
The current (I believe) Stalker DSR units can track 2 targets simultaneously and patrol speed and direct relative to patrol (limited to behind or in front). There is PATROL speed, STRONGEST signal and FASTEST signal readouts, each indicating orientation to the patrol i.e.fastest behind, strongest in front of patrol etc. and I *think* there is no lock for strongest (perhaps one of our resident donut munchers can advise on that aspect). How the readout is interpreted and assigned to any particular vehicle is down to the operator competence and/or any underlying need to fill quota.![]()
If it wasn't for a concise set of rules, we might have to resort to common sense!
Are you sure? even if police car is parked and the radar on stationary mode? i think your wrong.
So do the nz police radars, every shift they are used, and fill in the log book after testing is complete.
paranoia, paranoia, everybodies coming to get me!!
Well obviously not, as it should have been blatantly obvious by the comment I made. I was refering to situations in which the car is moving and, should you have read the thread, I've already been told I was wrong by Speedie as it is the radar unit itself that measures the vehicle's speed rather than simply taking a read from the car's own speedo.
Really. Very interesting, as I have a letter dated yesterday that states precisely the opposite.
So who's wrong?Originally Posted by New Zealand Police Infringement Bureau
Everybody's. If you're going to take the piss, at least do it grammatically.
Police radar cannot really be compared to the radar used on boats or at airports etc. Other than the fact they rely on a reflected signal from a target, they are completely different.
Boat radar works by sending a short pulse of energy. By measuring the time for the signal to travel to a target and return you know how far away it is. And as you have a very directional antenna, you know what direction it is. To calculate speed, you need to measure the distance to the target, wait a period of time and measure it again.
So.. boat radar can see lots of targets, and distinguish betwwn them as it can measure distance, and direction.
Police radar uses doppler shift techniques. With doppler shift you transmit energy at a known frequency, and you measure the frequency of the refleted signal.
This gives you instant data on target speed. But, you don't know what your tarket is. You only roughly know the direction, and you have no idea at all of the distance to the target.
And if you have two targets with the same relative speed towards the radar, regardless of difference in distance you will see only one. (Which one is a guess !)
While police regularly use radar in traffic, from a technical point of view, its not really good enough to use when there are multiple targets.
Look at my web page www.eslnz.com/radar.html for a better explanation.
David must play fair with the other kids, even the idiots.
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Thanks for the link to your website. Very good information clearly explained. Thanks. Cheers.![]()
When you take thousands of photos of your bike does the light from the flashweaken the plastic?
From the link below; U.S. F117A Nighthawks, also known as Stealth fighters, swoop largely undetected through radar because their "radar-invisible" paint and angular exterior minimize reflected signals.
http://www.sandia.gov/isrc/F117.html
I'm selling my new riding gear!! Only worn a few times get a deal Kiwibikers!!
http://www.kiwibiker.co.nz/forums/sh...53#post1414653
Speaking of such, did anybody seeee the Mythbusters episode where they tried everything the knew of to beat a radar - and didn't??
Some of the ideas and devices were hilarious, I couldn't believe there was so many old-wives tales about how to beat a radar out there - and people believed them!![]()
Winding up drongos, foil hat wearers and over sensitive KBers for over 14,000 posts...........![]()
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"Those who would give up essential liberty to purchase a little temporary safety deserve neither liberty nor safety." - Benjamin Franklin (1706-90)
"I would rather be exposed to the inconveniences attending to much liberty than those attending too small a degree of it." - Thomas Jefferson (1743-1826)
"Motorcycling is not inherently dangerous. It is, however, EXTREMELY unforgiving of inattention, ignorance, incompetence and stupidity!" - Anonymous
"Live to Ride, Ride to Live"
"Those who would give up essential liberty to purchase a little temporary safety deserve neither liberty nor safety." - Benjamin Franklin (1706-90)
"I would rather be exposed to the inconveniences attending to much liberty than those attending too small a degree of it." - Thomas Jefferson (1743-1826)
"Motorcycling is not inherently dangerous. It is, however, EXTREMELY unforgiving of inattention, ignorance, incompetence and stupidity!" - Anonymous
"Live to Ride, Ride to Live"
I think it was about beating laser as opposed to radar, and yeah some of the myths were amazing if not downright idiotic. I mean who the hell would drive with a mirror ball hanging from the rear view mirror. And CD's sheeit. I see cars in NZ with CDs all over them. How the crap do they think that that is going to work.
Superdukes. Serving up shame to sportsbikes since ages ago.
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