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111results about How to "Eliminate clutter" patented technology

Phased array beamforming method based on airborne equipment

The invention relates to the technical field of phased-array antennae and discloses a phased array beamforming method based on airborne equipment. The method comprises the steps of dividing a phased-array antenna array element into a left antenna array element and a right antenna array element; carrying out in-phase feeding on the left antenna array element and the right antenna array element, and adding a pattern function formed by the left antenna array element and a pattern function formed by the right antenna array element together to obtain a sum beam; carrying out anti-phase feeding on the left antenna array element and the right antenna array element, and carrying out subtraction on a pattern function formed by the left antenna array element and a pattern function formed by the right antenna array element to obtain a difference beam. According to the method, the application of the phased array beamforming method in the airborne equipment is achieved; the sum beam and the difference beam can be generated easily, and beam scanning can be achieved; the application of the phased-array antennae enables scanning to be achieved more flexibly, anti-jamming capacity to be high, and reliability to be high; meanwhile, the anti-jamming capacity of a system is improved by means of the sidelobe suppression technique.
Owner:四川九洲空管科技有限责任公司

Continuous wave radar signal processing method based on single-target triangular linear frequency modulation

The invention provides a continuous wave radar signal processing method based on single-target triangular linear frequency modulation, which comprises the steps that radar generates a multi-period symmetrical triangular linear frequency modulation continuous wave and transmits the multi-period symmetrical triangular linear frequency modulation continuous wave; an echo signal received by the radarand a local oscillator signal are mixed, and pass through a low-pass filter to obtain an up-regulation frequency band difference frequency signal and a down-regulation frequency band difference frequency signal; FFT processing is carried out on the up-regulation frequency band difference frequency signal and the down-regulation frequency band difference frequency signal to obtain a difference frequency spectrum, the difference frequency spectrums of multiple periods are accumulated, a threshold is set, frequency points exceeding the threshold are obtained, equal frequency points are found outand subjected to zero setting, and fixed clutters are eliminated; a relation between the remaining frequency points and a speed distance is established to obtain a target distance and a speed; and thesignal is enabled to pass through a band-pass filter of the residual frequency points to obtain a target angle. According to the invention, the positions of the frequency points of clutters in the same period in the up-regulation frequency band and the down-regulation frequency band are not changed, so that the frequency points are set to be zero by setting the threshold and comparing the frequency points, in this way, the clutters can be well eliminated, the signal-to-noise ratio is not reduced, and the method is easy to implement.
Owner:XI AN JIAOTONG UNIV

Medical waste temporary storage system for inpatient area and using method

The invention belongs to the technical field of medical waste treatment and particularly discloses a medical waste temporary storage system for an inpatient area. The medical waste temporary storage system comprises an outer shell, an upper storage area and a lower storage area are arranged in the outer shell, and the upper storage area and the lower storage area are separated through a supportingplate. The upper storage area is cylindrical and is partitioned into at least four upper partition storage chambers through partition plates, a rotating shaft is arranged in the center of the upper storage area, and the upper partition storage chambers rotate along with the rotating shaft. A body fluid storage chamber, a blood bag storage chamber and a glass storage chamber are arranged in the lower storage area. An upper input port corresponding to the upper storage area is formed in the outer shell, and three lower input ports corresponding to the lower storage area are formed in the outershell and correspond to the body fluid storage chamber, the blood bag storage chamber and the glass storage chamber respectively. An upper fetching port is formed in the top end of the outer shell, alower fetching port is formed in the side wall of the lower portion of the outer shell, an upper fetching port cover is arranged in the upper fetching port, and a lower fetching port cover is arrangedin the fetching port of the lower storage area.
Owner:HENAN CANCER HOSPITAL

Personnel respiration and heartbeat detection method based on millimeter wave radar

The invention discloses a personnel respiration and heartbeat detection method based on a millimeter wave radar, and belongs to the field of radar signal processing, and the method specifically comprises the steps: firstly, the radar transmits a linear frequency modulation pulse string signal to a to-be-detected target human body, and receives pulse echo signals containing clutters; a sampling matrix is formed through dechirp processing and discretization; then, fast Fourier transform is performed on each row of the matrix to obtain a time-distance image Rp (m, n); each column of Rp is used as a distance unit, and clutters of all distance units are eliminated by using the center of a constellation diagram; then, the noise power average value of each distance unit is taken as a threshold, a target existing in each distance unit is detected by adopting a unit average constant false alarm, and Doppler demodulation is performed according to the position of the target; finally, a separation waveform of respiration and heartbeat are reconstructed according to a demodulation result; cycle estimation on single breath or heartbeat is performed in the reconstructed waveform; and breathing and heartbeat waveforms and real-time frequency estimation of the pulse signals are output. The algorithm is simple, and the calculation amount is reduced.
Owner:BEIHANG UNIV
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