Patent ID: 9207308
Filing Date: 2015-12-08
Classification: G01S,H04B,H05B,Y02B

Abstract:
1. An illumination device comprising: doppler sensor and a light source driving unit, wherein the Doppler sensor comprises a doppler signal generation unit configured to transmit an electromagnetic wave to a detection range and receiving electromagnetic waves from a detection range, and generating a doppler signal based on a transmission signal used in transmitting the electromagnetic wave and a reception signal obtained from the received electromagnetic waves; and a determining unit configured to compare a difference spectrum with a reference spectrum to determine whether or not a moving object exists in the detection range and further configured to determine, when it is determined that there is a moving object in the detection range, whether or not there exists a human body in the detection range through a spectrum analysis using a first peak frequency, which is a frequency having the highest intensity in the difference spectrum obtained by subtracting a background spectrum from the spectrum of the doppler signal, wherein, in the spectrum analysis, the determining unit determines that there is no human body in the detection range when one of the first peak frequency and a second peak frequency having the second highest intensity in the difference spectrum is an integral multiple of the other, and wherein the light source driving unit is configured to turn on an electric light source based on a determination result from the determining unit.