Lighting Device with Microwave Detection Function
First Claim
1. A lighting device, comprising:
- a light source, for generating light;
a microwave sensor, comprising;
an active antenna module, for transmitting a first frequency modulation continuous wave (FMCW) signal toward a target with a sweep period and for receiving a second FMCW signal reflected from the target;
a modulation module, electrically connected to the active antenna module and used for generating a modulation signal provided to the active antenna module according to a range gate chosen from a plurality of range gates, a bandwidth of the first FMCW signal being modulated according to amplitude of the modulation signal, and the plurality of range gates bi-uniquely corresponding to bandwidths of a plurality of first FMCW signals; and
a discrimination control module, electrically connected to the modulation module, for calculating a range between the microwave sensor and the target based on the beat frequency signal generated after the first FMCW signal and the second FMCW signal are demodulated when the object is located within the range gate, for calculating velocity of the target according to a frequency of the Doppler signal, and for determining whether to generate a triggering signal or not according to the calculated velocity and the calculated range; and
a power module, electrically connected between the microwave sensor and the light source for enabling a lamp based on the triggering signal.
1 Assignment
0 Petitions
Accused Products
Abstract
A lighting device includes a microwave sensor for adjusting its sensing range based on a range gate selected from multiple range gates. An active antenna module transmits first FMCW signal toward a target based on the selected range gate and for receiving second FMCW signal reflected from the target. The microwave sensor demodulates the first FMCW signal and the second FMCW signal to generate beat frequency signal. Then another demodulator demodulates the beat frequency signal to generate Doppler signal. The microwave sensor calculates a range between the microwave sensor and the target based on the beat frequency signal, calculates velocity of the target according to frequency of the Doppler signal, and determine whether to generate triggering signal according to the calculated velocity and the calculated range, when the object located within the range gate. The power module enables a lamp based on the triggering signal.
16 Citations
14 Claims
-
1. A lighting device, comprising:
-
a light source, for generating light; a microwave sensor, comprising; an active antenna module, for transmitting a first frequency modulation continuous wave (FMCW) signal toward a target with a sweep period and for receiving a second FMCW signal reflected from the target; a modulation module, electrically connected to the active antenna module and used for generating a modulation signal provided to the active antenna module according to a range gate chosen from a plurality of range gates, a bandwidth of the first FMCW signal being modulated according to amplitude of the modulation signal, and the plurality of range gates bi-uniquely corresponding to bandwidths of a plurality of first FMCW signals; and a discrimination control module, electrically connected to the modulation module, for calculating a range between the microwave sensor and the target based on the beat frequency signal generated after the first FMCW signal and the second FMCW signal are demodulated when the object is located within the range gate, for calculating velocity of the target according to a frequency of the Doppler signal, and for determining whether to generate a triggering signal or not according to the calculated velocity and the calculated range; and a power module, electrically connected between the microwave sensor and the light source for enabling a lamp based on the triggering signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
Specification