5 results about "Chirp rate" patented technology

The application discloses a kind of laser detection device and method, belong to laser detection technical field, the device includes beam output module, light splitting module, optical path multiplexing module, two coherent mixing modules and signal processing module;Beam output module outputs the positive and negative double-chirp laser of frequency-modulated time sequence synchronization of different wavelength, chirp rate absolute value equal, after light splitting, optical path multiplexing, get local light and echo light, two coherent mixing modules generate four-way quadrature beat frequency signal, signal processing module does product subtraction and addition operation to four-way beat frequency signal and constructs complex signal, offset Doppler broadening interference introduced by rotating polygon mirror, again Fourier transform, peak searching obtains intermediate frequency parameter and calculates target vector velocity, the application can completely eliminate the influence of Doppler broadening on speed measurement, significantly improve speed measurement precision.

The application provides a real-time correction method and device for detecting equipment operation parameters, equipment and a medium, and belongs to the technical field of ore body exploration. The method comprises the following steps: acquiring point cloud data of a target area based on a detecting equipment; calling a preset dynamic local quality model to perform spatial division and physical property identification processing on the point cloud data to obtain a quality voxel; performing multipole moment expansion and gravity projection processing on the quality voxel to obtain a terrain gravity correction number; performing frequency shift conversion and modulation processing on a frequency shift parameter of a radar scanner based on the terrain gravity correction number to obtain a compensation frequency shift parameter, which is used for adjusting a laser chirp rate to offset a phase shift of the radar scanner; and correcting an operation parameter of a gravimeter in the detecting equipment based on the compensation frequency shift parameter. The above scheme can effectively improve the stability of the detecting equipment in performing an exploration task.

The application relates to the field of biometric identification technology and discloses a multi-modal handwriting dynamic feature extraction and identification system. The system synchronously acquires macro kinematic sequences and micro acoustic emission sequences, performs time axis regularization based on a bottom-layer hardware interrupt signal, extracts instantaneous geometric singular points of the macro kinematic sequences, combines stress checking to intercept effective micro windows, performs phase space line integral calculation in the effective micro windows to extract macro dissipation work parameters, applies phase compensation to the micro acoustic emission sequences based on corresponding physical coordinates to realize beam forming, acquires micro friction frequency response chirp rates, fuses the dissipation work parameters and the chirp rates to generate high-dimensional identification feature vectors, and inputs the high-dimensional identification feature vectors into a classifier to output a judgment result. The application quantizes a real dynamic physical work process of writing, effectively resists high-precision mechanical arm impersonation attacks, overcomes the defects that a single-channel acoustic acquisition is susceptible to bottom noise and dispersion interference, and improves identification stability in a complex environment.

The application discloses a wireless mobile communication method based on generalized orthogonal chirp division multiplexing, and relates to the field of wireless mobile communication. The method comprises the following steps: GOCDM modulation, double-selected channel modeling, received signal modeling, GOCDM demodulation under the double-selected channel, and channel equalization. The GOCDM communication system is applicable to a double-selected channel (i.e. a time-varying multipath channel). Each orthogonal base wave of the GOCDM is a Zadoff-Chu (ZC) sequence. The ZC sequence is determined by a sequence length N and a root coefficient l. The waveform of the GOCDM can be regarded as a digital chirp signal. When the N is fixed, the root coefficient l determines the chirp rate, namely the digital frequency modulation rate. The root coefficient l increases the flexibility of system design. By changing the l, the digital frequency modulation rate can be changed. When the l of the GOCDM is 1, the GOCDM is equivalent to a conventional OCDM system. Since the orthogonal base wave of the GOCDM is a digital chirp signal, the GOCDM has the characteristics of time-frequency domain double diffusion. The application improves the reliability of high-speed wireless communication on the double-selected channel.

This invention discloses a method for classifying deep carbonate sedimentary cycles based on matched Chirplet compression transform (MCST). The method includes: inputting the seismic signal to be analyzed; calculating the instantaneous frequency and group delay in the short-time Fourier transform domain to obtain the chirp rate function; deriving the IF band center and constructing the time-frequency energy focusing domain in the chirplet transform domain; accurately obtaining the local rate of change of the instantaneous frequency trajectory in the chirplet transform domain by constructing a matched Chirplet rate estimator; redistributing the time-frequency coefficients to the true instantaneous frequency trajectory in the time-frequency energy focusing domain through compression transform, thereby obtaining the time spectrum of matched chirplet compression transform (MCST); applying this method to perform time-frequency characterization of seismic trace data, and classifying deep carbonate sedimentary cycles by analyzing the changing trends of the tuned frequencies in the time spectrum.