초록 ▼

A dual channel microwave sensor employs single sideband Doppler techniques in innumerable vibration, motion, and displacement applications. When combined with an active reflector, the sensor provides accurate range and material thickness measurements even in cluttered environments. The active reflec

A dual channel microwave sensor employs single sideband Doppler techniques in innumerable vibration, motion, and displacement applications. When combined with an active reflector, the sensor provides accurate range and material thickness measurements even in cluttered environments. The active reflector can also be used to transmit multi-channel data to the sensor. The sensor is a homodyne pulse Doppler radar with phasing-type Doppler sideband demodulation having a 4-decade baseband frequency range. Ranging is accomplished by comparing the phase of the Doppler sidebands when phase modulated by an active reflector. The active reflector employs a switch or modulator connected to an antenna or other reflector. In one mode, the active reflector is quadrature modulated to provide SSB reflections. Applications for the low-cost system include a mechanical motion/rotation sensor, a robust security alarm, a throat microphone, a stereo guitar pickup, a direction sensitive cardiac monitor, an electronic dipstick, a material thickness/dielectric sensor, a metal smoothness meter, a non-contact electronic readout, an RFID tag, silent "talking" toys, a passive-emitter data link, a beam interrupter, and a gold nugget finder.

대표청구항 ▼

1. A microwave Doppler transceiver apparatus comprising:a transmit clock signal generator for generating a transmit clock signal; a pulsed transmit oscillator for producing transmitter RF bursts in response to the transmit clock signal, each burst comprising one or more cycles of a waveform; an RF q

1. A microwave Doppler transceiver apparatus comprising:a transmit clock signal generator for generating a transmit clock signal; a pulsed transmit oscillator for producing transmitter RF bursts in response to the transmit clock signal, each burst comprising one or more cycles of a waveform; an RF quadrature network connected to the transmit oscillator to split the transmitter RF bursts into two phases; an antenna connected to the RF quadrature network to transmit the transmitter RF bursts, and to receive echoes of the transmitted RF bursts; quadrature detectors connected to the RF quadrature network to detect in-phase (I) and quadrature (Q) phase components of the RF bursts; a baseband quadrature network connected to the quadrature detectors to shift the relative phase of the I and Q components by 90 degrees and to provide first and second outputs thereof; an SSB matrix connected to the first and second outputs of the baseband quadrature network to provide upper and lower sideband outputs.