4 results about "Digital signal detection" patented technology

A method comprising: generating a frequency-modulated local oscillator signal (sLO(t)) with a frame partitioned into N chirp positions, where N is a predetermined integer; wherein the frame contains a scan chirp at one or more chirp positions and regular chirps at the remaining chirp positions, the regular chirps having a chirp bandwidth and a start frequency (fSTART), and the at least one scan chirp having a scan bandwidth greater than the chirp bandwidth; transmitting an RF signal representing the frame, wherein the transmit power is zero or reduced to less than the power of a regular chirp during the transmission of the at least one scan chirp;Receiving an RF radar signal (yHF(t)) corresponding to the frame, down-converting the received RF radar signal (yHF(t)) to a baseband using the local oscillator signal (sLO(t)), and generating a digital signal (y[n]) based on the down-converted signal (y(t)); detecting first samples affected by interference in a portion of the digital signal (y[n]) corresponding to the scan chirp, and updating the start frequency (fSTART) for the regular chirps following the scan chirp based on the detected first samples; and detecting one or more radar targets based on the digital signal (y[n]), replacing the portion of the digital signal (y[n]) that does not correspond to the regular chirps with preset samples.

The embodiment of the application relates to the field of circuit safety detection control, and discloses a ground conduction detection and protection circuit based on a safety switch, which comprises a safety switch module, a verification detection switch K0, a sampling module, a threshold value logic conversion module and a detection module. The safety switch module comprises a first safety switch S0, a second safety switch S1 and an optocoupler U1, the S0 is connected in series with a first end of a power supply, the S1 is connected in series with a second end of the power supply, the S0 and the S1 are connected to the U1, and the U1 is connected to the detection module. The K0 is connected in series to a circuit and outputs a periodic pulse signal. The sampling module comprises a first sampling resistor RS1 and a second sampling resistor RS2, and the RS1 and the RS2 are connected in series. The threshold value logic conversion module is connected to the detection module and is used for converting a voltage between the sampling resistors into a digital signal after comparison with a threshold value. The detection module is used for detecting ground conduction conditions of the S0 and the S1, and improves safety detection and protection mode reliability.

In one embodiment, a receiver includes: an analog front end (AFE) circuit to receive and process an incoming radio frequency (RF) analog signal comprising a packet; an analog-to-digital converter (ADC) coupled to the AFE circuit to receive and digitize an analog signal based on the RF analog signal into a digital signal; a packet detector coupled to the ADC to detect the packet based on the digital signal; and a computation circuit coupled to the packet detector. The computation circuit may be configured to determine a received signal strength indicator (RSSI) value based at least in part on a portion of a preamble of the packet.