A radar sensing system includes at least one transmitter, at least one receiver and a processor. The at least one transmitter transmits a power shaped RF signal. The transmitted RF signal decreases in power over time. The at least one receiver receives a reflected RF signal. The reflected RF signal is the transmitted RF signal reflected from targets in the environment. The reflected RF signal is down-converted and the result provided to the processor. The processor samples the down-converted reflected RF signal during a plurality of time intervals to produce a sampled stream. The different time intervals of the plurality of time intervals will contain different signal levels of RF signals reflected from the targets. The processor also selects samples in the sampled stream over a selected time interval of the plurality of time intervals that is free of RF signals reflected off of near targets.

Power control for improved near-far performance of radar systems

Described are radar systems and methods. A transmit pulse is generated by the radar system. A first portion of the transmit pulse is processed by the radar system to form transmit pulse data. A second portion of the transmit pulse is directed by the radar system into a monitored volume. A return signal is received by the radar system, the return signal at least partially comprising a portion of the second portion of the transmit pulse reflected by one or more objects in the monitored volume. The return signal is processed, by the radar system, to form return signal data.

Open loop power oscillator Doppler radar

A sensor for detecting a parking space includes a modulating module for supplying a sinusoid wave having a modulation frequency, an active antenna module transmits a FMCW signal based on the modulation frequency and for receiving a reflected FMCW signal, a intermediate-frequency filter for extracting a first demodulating signal having the modulation frequency from the reflected FMCW signal generating modulation signal, a second intermediate-frequency filter for extracting a second demodulating signal having a multiplying frequency of the modulation frequency, an integrator for performing integral operation for the second demodulating signal to generate an integral voltage, a triggering circuit for generating a triggering voltage when the integral voltage is greater than a reference voltage, and a controller for performing operations relating to an existence of a vehicle when receiving the triggering voltage.

Sensor for detecting parking lot

A radar sensing system for a vehicle has multiple transmitters and receivers on a vehicle. The transmitters are configured to transmit radio signals which are reflected off of objects in the environment. There are one or more receivers that receive the reflected radio signals. Each receiver has an antenna, a radio frequency front end, an analog-to-digital converter (ADC), and a digital signal processor. The transmitted signals are based on spreading codes generated by a programmable code generation unit. The receiver also makes use of the spreading codes generated by the programmable code generation unit. The programmable code generation unit is configured to selectively generate particular spreading codes that have desired properties.

Programmable code generation for radar sensing systems

The invention relates to a system (1) for measuring disturbances, which is intended to be worn by a user, said system comprising: at least one bioelectric measurement means (4); an analogue-digital conversion device (6) electrically connected to said at least one bioelectric measurement means (4); and at least one conductive track (2) electrically connected to a ground (7) of the system (1) by means of a resistor (8) and an input (61) of the analogue-digital conversion device (6). The invention further relates to an item of clothing comprising at least one system (1) for measuring disturbances according to the present invention.

Disturbances indicator for a wearable device

A microwave sensor is disclosed. The microwave sensor includes an active antenna module, a first low pass filter, a second demodulator, a modulation module, and a discrimination control module. The active antenna module is utilized for transmitting a first FMCW signal towards a target and receiving a second FMCW signal reflected back from the target according to a sweep period. The active antenna module includes a loop antenna and a radio frequency transistor. The first low pass filter and the radio frequency transistor form a first demodulator. The first demodulator and the second demodulator perform two-stage down converting and demodulating to extract information for calculating range and velocity, respectively. The present invention adjusts a radio frequency bandwidth of the FMCW signal by first adjusting an amplitude of a modulation signal generated by the modulation module to control various detection ranges.

Microwave sensor having function of range gates

An active antenna module is disclosed. The active antenna module comprises a loop antenna, a RF transistor, a LR series circuit, a first bypass capacitor and a second bypass capacitor. The RF transistor comprises a control port, a first port, and a second port. Each of two ends of the loop antenna is electrically connected to one of the control port and the second port, and the control port and the second port are out of phase. The second port is electrically connected to the first port via the first bypass capacitor. The first port is electrically connected to ground via the LR series circuit. The second bypass capacitor and a resistor of the LR series circuit are connected in parallel.

Active antenna module

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.

Lighting device with microwave detection function

A low power microwave sensor includes an active antenna module for transmitting first FMCW signal toward a target and for receiving second FMCW signal reflected from the target. The active antenna module includes a loop antenna and a RF transistor having a second port coupled to a transmitting end of the loop antenna and a control port coupled to a receiving end of the loop antenna, the control port and the second port are coupled to inversed phase signals. The RF transistor is used for demodulating the first FMCW signal and the second FMCW signal to generate beat frequency. Then another demodulator is used to demodulate the beat frequency signal to generate a Doppler signal. The microwave sensor utilizes circuitry to demodulate the FMCW signals in two stages, determines a range between the sensor and the target based on the beat frequency, and determines velocity of the target according to frequency of a Doppler signal, in lieu of using software. The sensor also regulates detecting ranges by setting range gates relating to FMCW signals and triggers functions based on the velocity of the target.

Guo-Zhong Lu

Papers

Microwave sensor having function of range gates

Active antenna module

Lighting device with microwave detection function

Microwave sensor with range gate functions