天线放置不妥致使的过错
因雷达测速仪雷达波是沿直线发射 和反射的，假如天线放置不妥，当地势为非平原状态时，会使方针车的读数被其它车的速度替代。反射强度不同致使的过错
雷达测速仪因为车的巨细、形状各不相同，所以对雷达波的反射强度也不相同，当一辆大卡车处于被测方针车的后方时，虽然它间隔巡查车比方针车远，但其反射强度却大于方针车，这种状况便会致使车辆的误测。
COSINE角致使的过错
Antenna placed improper causative fault
Because radar velocimeter radar wave is along the line emission and reflection, if the antenna placement is wrong, when the terrain is non plain state policy, will make thecar reading by other car speed alternative. The reflection intensity of different causativefault
Because the car size, different shapes, so the reflection intensity of radar wave is not the same, when a truck at the rear of the vehicle measured policy, although it intervalpatrol car than the car far from the policy, but the reflection strength is greater than thepolicy of car, this situation will cause the vehicle measuring error.
COSINE angle resulting in fault
在移动丈量时，巡查车的速度是通过雷达波经地上物体反射后得到的，因地上物体与巡查车之间存在或大或小的视点，这便会致使巡查车速度比其实践速度低，一起因为方针车速度是由巡查车和方针车的相对速度减去巡查车速度而得出的，所以显现的方针车的速度会比其实践速度高。这种表象可通过进步雷达的测速间隔来防止。
两层反射致使的过错
因为雷达波极易发生反射，所以 雷达波有时会被某些车辆反射到其它车辆上，然后致使丈量过错。
反光镜致使的过错
当雷达测速仪在车内向外发射雷达波时，有些波束会被反光镜反射到巡查车后边，致使丈量的车速为后边的车辆 而非巡查车前的方针车速度。
路标致使的过错
路旁边的指示牌也是发生过错的要素之一。它会将雷达波反射到巡查车后边，致使丈量到的速度不在是方针车的速度，而是巡查车后的车速。
无线电搅扰致使的过错
当运用雷达测速时，假如周围有无线电波，会使雷达遭到搅扰，致使方针车的读数不稳定。所以在运用雷达时，要尽量避开无线电波的搅扰。
电扇搅扰致使的过错
当雷达测速仪被装到车内时，它常常检测到车内电扇的速度，然后致使丈量过错。
In mobile measurement, a patrol car speed by radar wave through the ground objects reflect obtained after, because of the presence of large or small view between theground object and the patrol car, this will cause a patrol car faster than its practicalspeed is low, because the policy together with the car speed is by a patrol car and guidelines for car the relative velocity minus the patrol car speed that show, so the policy of car faster than the practice of high speed. This representation can beprevented by velocity interval progress to radar.
The two layer reflection causative fault
Because the radar wave prone to reflection, so the radar wave is sometimes certain vehicles is reflected to the other vehicles, then the resulting measurement fault.
Mirror causative fault
When the radar velocimeter emit radar waves inside the car, some beam is reflected by the reflective mirrors to a patrol car behind, resulting in the measurement of speed for the behind the vehicle and non vehicle speed inspection front policy.
The signpost causative fault
One element of the signs beside the road are occurring fault. It will be the reflection of radar wave to a patrol car behind, causing the measure to speed the speed of the vehicle is not in policy, but after a patrol car speed.
Radio interference resulting in fault
When the use of radar, if there are radio waves around, will make the radar was disturbed, resulting in policy vehicle unstable readouts. So in the use of radar, to try to avoid the interference of radio waves.
Fan trouble resulting in fault
When the radar detector is mounted to the vehicle and it is often detected in the vehiclefan speed, and then causing measurement fault.