MDR for law enforcement [motion detector radar]

The motion detection radar (MDR) adds a new dimension to surveillance. The MDR can be effective even through wooden doors and concrete walls. It requires very little setup and does not have any external wires connected to it. Unlike TV cameras and IR sensors that must be concealed, the MDR can be placed in a "safe location" on the other side of a wall or hidden in a container with non-metallic walls. The MDR provides an effective and timely alert even if the person doing the surveillance is preoccupied, distracted or inadvertently nods off due to fatigue. The highly sensitive continuous wave (CW) phase detection radar has been approved by the Federal Communications Commission (FCC) for operation in the 902 to 928 MHz frequency band. There are restrictions imposed by the FCC which limit the power radiated from the antenna and signal harmonic content of any commercially sold product using this frequency band. While this is not necessarily the best frequency for material penetration, it is a reasonable compromise. This is because it can be sold and used commercially, and has proven to be effective.