Patent ID: 9274217
Filing Date: 2016-03-01
CPC Classification: G01S

Claim Text:
1. A microwave antenna, comprising: an active antenna module utilized for transmitting a first frequency modulation continuous wave signal towards a target and receiving a second frequency modulation continuous wave signal reflected back from the target according to a sweep period, the active antenna module comprising: a first low pass filter electrically connected to the first port of the radio frequency transistor, the first low pass filter and the radio frequency transistor forming a first demodulator, the first demodulator being utilized for demodulating a beat signal based on a range gate, and the beat signal having a frequency equal to a difference between frequencies of the first frequency modulation continuous wave signal and the second frequency modulation continuous wave signal; a second demodulator electrically connected to the first port of the radio frequency transistor, the second demodulator being utilized for demodulating the beat signal to generate a Doppler signal, a frequency of the Doppler signal being equal to a difference between an up-sweep beat frequency and a down-sweep beat frequency; a modulation module electrically connected to the active antenna module, the modulation module being utilized for generating a modulation signal to the active antenna module based on a range gate selected from a plurality of range gates, a bandwidth of the first frequency modulation continuous wave signal being adjusted according to an amplitude of the modulation signal, and each of the plurality of range gates being corresponding to one of the bandwidths of the first frequency modulation continuous wave signal; and a discrimination control module electrically connected to the modulation module, the discrimination control module being utilized for bypassing a calculation for the target if the target being located outside the range gate, and calculating a range between the microwave sensor and the target based on the beat signal and a moving velocity of the target based on the frequency of the Doppler signal if the target being located inside the range gate.