8 results about "Spectrum function" patented technology

This invention provides an automated testing device for UAV data links, including an industrial control computer, a display, a spectrum analyzer, a programmable DC power source, a programmable adjustable attenuator, a fixed attenuator I, a fixed attenuator II, a power divider I, a power divider II, an RF switch, a shielded box I, and a shielded box II. The software of the industrial control computer includes a system management module and an automated testing module. The advantages of this invention are: it uses general-purpose testing equipment, is based on a computer-automated program, and controls the settings of each testing device via a bus to simulate remote control, telemetry, image data transmission and reception, and bit error rate statistics; it achieves automated testing of core functional performance indicators of UAV data links such as power consumption, transmit power, spectrum, functionality, receiver sensitivity, bit error rate, and latency.

The invention discloses a cable joint damp degree assessment method and device and a storage medium. The method comprises the steps of obtaining a target reflection coefficient spectrum function corresponding to a target cable; b envelope peaks corresponding to the target reflection coefficient spectrum function are determined; b cable joints corresponding to the b envelope peaks in the a cable joints are determined; converting the target reflection coefficient spectrum function from a frequency domain to a time domain by adopting a preset time-frequency domain conversion algorithm to obtain a target time domain function; determining pulse peak pairs in the target time domain function to obtain b pulse peak pairs; and according to the b envelope peaks and the b pulse peak pairs, determining the damp degrees corresponding to the b cable joints to obtain b damp degrees. According to the embodiment of the invention, the detection precision of the damp degree is improved.

A data generation device is a device for generating data to control an SLM for shaping a light pulse for laser processing, and comprises at least one processor configured to: set information regarding a plurality of mutually different temporal-intensity waveforms each including a plurality of light pulses; generate each of a plurality of sets of an intensity spectrum function and a phase spectrum function based on each of the plurality of temporal-intensity waveforms; generate each of a plurality of pieces of data based on each of the plurality of sets of the intensity spectrum function and the phase spectrum function; and calculate a generation efficiency in the SLM for each of the plurality of temporal-intensity waveforms based on each of the plurality of pieces of data and determine data for controlling the SLM from among the plurality of pieces of data based on the generation efficiency.

This invention discloses a signal amplitude deviation compensation method and system, applied to a spectrum analysis system that uses a rectangular window to truncate a single-frequency sinusoidal signal. The method includes: acquiring the true frequency of the input signal, the sampling frequency of the spectrum analysis system, and the number of Fast Fourier Transform (FFT) sampling points; calculating the normalized frequency offset of the true frequency relative to the FFT discrete grid; determining whether the normalized frequency offset is zero; if it is non-zero, calculating an amplitude deviation compensation value based on the normalized frequency offset and the spectrum function model of the rectangular window; acquiring the original signal amplitude value obtained after FFT calculation of the input signal; and compensating the original signal amplitude value using the amplitude deviation compensation value to obtain the compensated signal amplitude value. This invention achieves automated, high-precision integrated modeling from device to system.

This invention discloses a satellite navigation multi-interference source localization method and related apparatus, comprising: acquiring received signals from each observation station in the observation system; acquiring the acquisition covariance matrix of each observation station in the observation system; constructing a power spectrum function based on the received signals and acquisition covariance matrix of each observation station; constructing a target cost function based on the power spectrum function; solving the target cost function based on the power spectrum function to obtain a global maximum; drawing a target cost function plane diagram based on the global maximum; and locating multiple interference sources based on the target cost function plane diagram. This method and related apparatus can locate multiple interference sources and have the characteristics of low computational complexity, high positioning accuracy, and high speed.

The application particularly relates to a simulation method of a completely non-stationary wind field of a mountain bridge, which comprises the following steps: obtaining an evolution power spectrum function of a completely non-stationary wind field of a bridge to be simulated; determining representative interpolation nodes based on the evolution power spectrum function; the interpolation nodes comprise time domain interpolation nodes and frequency domain interpolation nodes; performing Cholesky decomposition on the interpolation nodes to obtain corresponding node Cholesky decomposition values; then further decomposing the node Cholesky decomposition values into a series of time and frequency function products by a non-negative matrix decomposition method; applying a Hermite interpolation method to establish global time and frequency interpolation functions; and generating a simulation high-efficiency calculation expression of the corresponding completely non-stationary wind field of the bridge based on the global time and frequency interpolation functions, so as to realize the simulation of the completely non-stationary wind field of the mountain bridge. The simulation method in the application can adapt to the completely non-stationary wind field, can take into account the time-varying frequency characteristics and spatial correlation of the wind speed field simulation, and can improve the practicability and efficiency of the bridge wind field simulation.

The invention discloses a direction of arrival estimation method and device, electronic equipment, a medium and a program product. The method comprises the following steps: acquiring a noise subspace matrix and a pseudo-spectral function when an antenna array receives a target signal; determining an angle estimation interval of the target signal based on the spectrum characteristics of the noise subspace matrix; and determining a final incident angle of the target signal in the angle estimation interval based on the extreme point of the pseudo-spectral function. According to the method, the final incident angle is determined in the angle estimation interval, so that the search range of the target signal angle is reduced, search in a full-angle range is avoided, the calculation amount is reduced, and the determination accuracy of the final incident angle is improved.

The invention discloses a two-dimensional DOA estimation method and system based on a V-shaped semi-symmetric co-prime array, and the method comprises the steps: forming a VSSCA array structure receiving signal through the optimization design of a VCA, and obtaining an axis of the VSSCA array structure and a receiving signal corresponding to the axis; secondly, covariance matrixes of the received signals are calculated respectively, and corresponding virtual arrays are obtained after vectorization processing, sorting and redundancy elimination operation are carried out; then continuous virtual arrays are extracted from the virtual arrays, and covariance matrixes corresponding to the continuous virtual arrays are calculated respectively; and finally, respectively carrying out eigenvalue decomposition to obtain corresponding noise subspaces, constructing a MUSIC spectral function based on the noise subspaces, obtaining a joint DOA estimated value through one-dimensional spectral peak search, and calculating a DOA estimated value of an information source. According to the structure provided by the invention, when two-dimensional parameter estimation is realized, more signal sources can be analyzed with a smaller number of physical array elements, and the estimation precision and stability are remarkably improved.