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Sample Form

Stationary Radar Simulator

Target approaching radar on a straight stretch of road

stationary radar model image

The below form generates data that includes measured target speed (when it changes) and range / time to target even with radar for acceleration less than 1 mph or kmh per radar sample time. Except for Distance (2) and Initial Time (5b), all numbers entered must be whole numbers (no decimal point).

FORM input image

Sample Form Results

Stationary Radar
Target
Speed 		Radar Off
Road (target lane)
60 mph
97 kmh 		35 feet
10.7 meters

Radar Cycle (sample time): 300 ms

MEASURED TARGET SPEED

Measured RANGE TIME
to even 		error ACCELERATION
mph / cycle 		Radar
Cycle
60 mph500 feet 152 m 5.68 sec0 mph 0 1
59 mph262 feet 80 m2.98 sec-1 mph0.110
58 mph130 feet 40 m1.48 sec-2 mph0.815
57 mph104 feet 32 m 1.18 sec-3 mph1.516

Closing speed: 60 mph = 26.4 feet/cycle (8 m/cycle)

TRACK SUMMARY
acceleration < 1 mph / radar cycle

15 radar cycles

Measured
Speed		 RANGE TIME
to even
60 to
58 mph		526 feet161 m5.98 sec START Track
130 feet40 m1.48 sec END Track
396 feet 121 m 4.5 sec TOTAL Track

For a target traveling at 60 mph and radar/ladar with a 300 ms sample time and 35 feet off the road (target path) that starts target track (displayed) at 500 feet -- the Cosine Effect lowers measured target speed at a range of 262 feet. The last measured target speed occurs at 130 feet (the last full cycle acceleration less than 1 mph/300 ms cycle). Target acceleration (due to the Cosine Effect or actual acceleration) greater than 1 mph per radar cycle (300 ms above) is too fast for a radar/ladar to process as a bona fide target.

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Police Traffic Radar Handbook
Chapter 4.2