RADAR

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RADAR

Police use hand-held or vehicle mounted radar units to monitor the speed of vehicles for the purpose of traffic law enforcement. The units are "low power" and have a range of only about one-half mile. The range may be more or less depending upon Terrain, weather, and the size of the target vehicle. Officers must usually be trained and certified to operate a radar unit and to testify in court concerning readings obtained with it. Traffic radar may be operated in the stationary mode or the moving mode. Radar units are designed either for stationary use only, or may have a switch to select stationary or moving operation. In the stationary mode the officer parks the police vehicle at an advantageous location and directs the radar antenna in the direction of the target vehicle. The target vehicle may be either moving toward the radar unit or away from it. If the target is large enough or close enough to reflect the radar signal back to the radar unit, the target's speed will be recorded. In the moving mode, the officer's vehicle must be in motion and can monitor the speed of targets approaching from the opposite direction. The radar unit measures the speed of the officer's vehicle and the speed of the oncoming target vehicle. The two speeds are added to each other by the radar's computer. Then the police vehicle speed is subtracted from the total of the two thus giving the target speed. The readout is obtained in a fraction of a second. The radar unit must be calibrated at the beginning of each shift. Some jurisdictions may require that the unit be calibrated before and after each radar traffic stop is made. The unit may be calibrated manually and electronically by the officer. Manual calibration is done by striking a small tuning fork "cut" for a certain speed and holding the fork in front of the radar antenna. If properly calibrated, the radar will indicate the same speed as stamped on that particular tuning fork. The unit is also checked by pressing a "calibrate" button on the radar and observing the correct electronic responses indicating that the unit is functioning properly. Traffic radar is prone to a few errors

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