765 results about "Short Waves" patented technology

The invention relates to the technical field of spectrum detection, in particular to a multi-spectrum single-gas-chamber multi-gas self-defined detection method and system.The surface of a cavity mirror of an integral cavity is subjected to regional film coating according to detection requirements, multiple annular reflection regions and a circular reflection region are formed through film coating, the central wavelengths reflected by different reflection regions are different, and the central wavelengths are different; corresponding to absorption peaks of different gases, in order to overcome the limitation of a detector on a detection wave band and optimize a detection light path, a central light beam turning structure is arranged on a light path of an emergent end of the integral cavity and is used for changing the propagation direction of transmission light of a circular reflecting region, so that the transmission light enters a second detection device; the transmission light of the annular reflection area is incident to the first detection device, the problem that the detection spectrum of a traditional detection system is limited by the response range of a single detector is solved, and the detection system can detect and cover a wide range from short waves to long waves by customizing the working spectrum of the two detection devices.

The invention discloses a medium-short wave signal transmission interference suppression method and system based on wireless radio and television, and the method comprises the following steps: S1, collecting and preprocessing medium-short wave frequency band data, and constructing a frequency spectrum state data set; s2, constructing a spectrum evolution cognitive map model based on the spectrum state data set; s3, performing clustering analysis by using the spectrum evolution cognitive map model to generate a broadcast interference popularity map; s4, inputting the spectrum evolution cognitive map model and the broadcast interference heat map into an improved badger interference avoidance algorithm, and outputting a frequency hopping avoidance path; s5, the broadcast transmitting system executes frequency hopping scheduling control according to the frequency hopping avoiding path, and it is guaranteed that frequency point switching is completed under the condition that broadcast service is not interrupted; and S6, the broadcast receiving terminal collects signal quality parameters and transmits the signal quality parameters back to the central system, and the node state of the spectrum evolution cognitive graph model is updated in real time. According to the method, active avoidance of medium-short wave broadcast interference and stable frequency hopping scheduling are realized by combining frequency spectrum cognitive modeling and a swarm intelligent optimization algorithm.

The invention discloses a short wave signal detection, identification and training method based on deep learning. The method comprises the following steps: extracting IQ data of a narrowband signal from target signal data through a deep learning model; the modulation features and protocol features of the narrowband IQ data are analyzed through a deep learning model, and signal modulation mode identification and signal protocol type identification are carried out; storing all processed signal data and related label information; labeling the signal data based on a deep learning model and a preset rule, and storing a finally confirmed label as a final labeling result in a database; and collecting labeled data from the database, performing learning model training and parameter adjustment based on a deep learning framework, and performing retraining by taking a first time interval as a period. The invention also discloses a short wave signal detection, identification and training device based on deep learning, corresponding equipment and a storage medium. According to the invention, the short-wave signal can be efficiently and accurately detected and identified.

The invention relates to a visible light / short-wave infrared dual-band common-caliber optical system, which comprises a common-caliber part, a plane beam splitter, a visible light channel subsystem and a short-wave infrared channel subsystem, and is characterized in that the common-caliber part is positioned at the foremost end of the optical system and consists of a primary reflector and a secondary reflector which are coaxially arranged; the plane beam splitter is located on a light path behind the secondary reflector, full-wave-band light from an object side is reflected by the primary reflector and the secondary reflector in sequence, then reaches the plane beam splitter to be split, and then enters the visible light channel subsystem and the short-wave infrared channel subsystem to be imaged in different wave bands, and the optical system achieves dual-wave-band common caliber. According to the invention, the design of long focal length and large aperture of the dual-band system is realized, the target detection / identification capability of the system is improved, the system has the advantages of high spatial resolution, long operating distance and high identification probability, meanwhile, the system structure is effectively simplified, the system volume is reduced, the installation and adjustment difficulty is reduced, and a relatively low obscuration ratio and relatively high imaging quality are realized.

The invention discloses a short-wave strong electromagnetic pulse suppression circuit with direct current and control functions. The short-wave strong electromagnetic pulse suppression circuit comprises an I-stage transient protection circuit, a three-signal circuit and an II-stage transient protection circuit, the I-stage transient protection circuit is formed by connecting two stages of gas discharge tubes in series and is used for protecting a low-frequency part in the lightning electromagnetic pulse or the nuclear power electromagnetic pulse, and the output end of the I-stage transient protection circuit is connected with the three-signal circuit; the three-signal circuit provides a path for transmission of the short-wave signal, the direct-current signal and the control signal and carries out transient protection, and the output end of the three-signal circuit is connected with the II-stage transient protection circuit; and the II-stage transient protection circuit is a voltage clamping circuit consisting of a low-capacitance diode and a bidirectional transient suppression diode, and is used for protecting a high-frequency part in the lightning electromagnetic pulse or the nuclear power electromagnetic pulse and clamping the residual voltage at a relatively low level. The device can effectively protect thunder and lightning and nuclear power electromagnetic pulses, has the characteristics of small insertion loss, low residual voltage and the like, and can greatly improve the strong electromagnetic environment viability and anti-interference capability of a short-wave radio station.

The utility model provides a power calibration system of a solid-state high-power AM short-wave transmitter, relates to the technical field of radio and television, and adopts the technical scheme that the system can quickly respond to power deviation and continuously adjust parameters of excitation signals through a control mechanism based on real-time feedback, so that the output power is accurately controlled. After the exciter unit receives the control signal sent by the computer, the optimized excitation signal can be generated, it is ensured that the input signal received by the power amplifier unit is adjusted in advance, and the power amplifier efficiency and the output signal quality can be improved. And the power amplifier unit amplifies the optimized excitation signal into a high-power radio-frequency signal and outputs the high-power radio-frequency signal to complete the whole power amplification process. Through cooperative work of the computer, the exciter unit, the power amplifier unit, the frequency spectrograph and the power meter, a closed-loop control system is formed, and high-precision and high-efficiency power calibration can be realized.

The invention relates to the technical field of rehabilitation instruments, in particular to a control method and system based on an ultra-short wave therapeutic instrument. The method comprises the following steps: acquiring illness state information and human body composition data of a user; the illness state information comprises a treatment part, and the human body composition data comprises a body fat rate, a water content and a muscle content; inputting the human body composition data and the illness state information into a trained treatment parameter recommendation model to obtain treatment parameters of the user; the treatment parameters comprise output power and treatment time, and the treatment parameter recommendation model is a machine learning model; and outputting the treatment parameters, so that the ultrashort wave therapeutic apparatus emits ultrashort waves corresponding to the treatment parameters. According to the method, the treatment parameters are automatically generated according to the actual situation of the user, and the treatment effect of the user is improved.

The invention relates to the technical field of adaptive optics, and particularly provides a wavefront detection system for a dark and weak target under a strong sky background, the wavefront detection system comprises a Shack-Hartmann wavefront sensor system and a wavefront detection processing unit, the Shack-Hartmann wavefront sensor system carries out wavefront detection on a short wave infrared band of 1.3-1.7 [mu] m, and the wavefront detection processing unit carries out wavefront detection on the short wave infrared band of 1.3-1.7 [mu] m. And the wavefront detection processing unit corrects a sub-aperture image obtained by detection through a weighted self-threshold local contrast algorithm, performs self-threshold operation on pixels in a center unit according to a gray scale ratio weight of the center unit and a background unit of the sub-aperture image, introduces an energy weight to eliminate PNHB noise, and reconstructs a centroid of the sub-aperture image. According to the invention, a Shack-Hartmann wavefront sensor system is applied to a short-wave infrared band, so that a sky background spectrum is effectively blocked, the target brightness is ensured, background light radiation photons received by a detector are reduced to the greatest extent, various noises and background interferences are inhibited by optimizing a threshold algorithm, and the wavefront detection precision is remarkably improved.

The invention provides a positioning method and system based on the time difference of global short-wave time service stations, and the method comprises the steps: obtaining the coordinate information of each short-wave time service station, receiving the short-wave time signals of a plurality of short-wave time service stations, and recording the time when each short-wave time signal is actually received; eliminating the delay error of the ionosphere to the short-wave time signal, and calculating the time difference between the time when the short-wave time signal is received and the standard time when the short-wave time signal is broadcasted; and calculating the geographic position of the receiving end by using the time differences and the coordinate information corresponding to the at least three short-wave time service stations in combination with a time difference positioning algorithm. According to the method, the time difference information of a plurality of global short-wave time service stations is combined, the time delay error is eliminated, and the geographic position of the receiving end is calculated by using a time difference positioning algorithm, so that the positioning precision is improved. The method is suitable for an area where a GPS and other satellite navigation systems cannot cover or signals are interfered, the application range of the positioning technology is expanded, and the cost is reduced.

The invention belongs to the technical field of short-wave communication, and relates to a short-wave sky-wave beyond-visual-range link unified channel modeling method for a high-latitude region, which comprises the following steps of: acquiring an actually-measured channel parameter, acquiring a channel parameter of a channel propagation model, comparing the channel parameter with the actually-measured channel parameter, and if the channel parameter does not accord with the actually-measured channel parameter, determining that the channel propagation model is a short-wave sky-wave beyond-visual-range link. If so, driving a link observation system to measure the channel according to the channel parameter, obtaining a full-link channel characteristic parameter on an actual transceiving channel, and correcting the channel parameter of the channel propagation model; otherwise, calculating a link long-period channel parameter according to the channel parameter, and performing fitting modeling on the long-period channel parameter to obtain a channel transmission model; the high-latitude region ionosphere model is adopted, the high-latitude short-wave communication channel parameters of the specified link region are calculated through 3D ray tracing, and the cost for constructing a short-wave communication channel system in the given link direction in the high-latitude region can be reduced.

The invention provides a short-wave infrared detector digital alloy material and a preparation process thereof. The preparation process comprises the following steps: growing a GaSb buffer layer on the surface of an n-type GaSb substrate; starting a first In furnace, and growing an InAs layer on the surface of the GaSb buffer layer in cooperation with an As beam; starting a second In furnace, and growing a quaternary solid solution layer matched with a GaSb buffer layer lattice on the surface of the InAs layer in cooperation with the Ga furnace and the AsSb beam; and alternately growing an InAs layer and a quaternary solid solution layer on the surface of the quaternary solid solution layer to generate a superlattice structure until the total thickness of the superlattice structure reaches a set target thickness, thereby obtaining the digital alloy material. According to the digital alloy material for the short-wave infrared detector and the preparation technology of the digital alloy material, the short-wave infrared detector can be expanded to the wave band ranging from 2.4 micrometers to 2.8 micrometers at the 50% cut-off wavelength.

The invention provides a short-wave multi-mode hollow-core anti-resonance optical fiber and a preparation method thereof, and relates to the technical field of optical fibers, and the short-wave multi-mode hollow-core anti-resonance optical fiber comprises an outer sleeve and a plurality of anti-resonance units which are arranged along the circumferential direction of the inner wall of the outer sleeve in an array manner; a central cavity enclosed by the plurality of anti-resonance units forms a fiber core area; the anti-resonance unit comprises at least three layers of anti-resonance tubes with different radiuses and two supporting rods arranged between two adjacent layers of anti-resonance tubes; wherein the two supporting rods in each layer are oppositely and obliquely arranged in pairs by taking the radial direction of the optical fiber as a symmetry axis, and the supporting rods on the same side are sequentially arranged along the same radius of the anti-resonance unit. Therefore, the waveguide filter has the advantages of being suitable for the 850 nm wave band, and being capable of supporting more high-order guided modes while giving consideration to low loss.

The invention provides a maritime emergency lifesaving comprehensive management system and method, and belongs to the technical field of software communication, the system comprises a guarding platform, a comprehensive processing platform and at least one application platform, the guarding platform is used for receiving rescue information sent by a user and sending the rescue information to the processing platform; the guarding platform comprises a short-wave guarding station, an ultra-short-wave guarding station and at least one satellite ground station which are connected with the communication bearing network; the comprehensive processing platform is connected with the guarding platform through a communication bearing network; the comprehensive processing platform comprises a comprehensive processing module and a backup service module, and the comprehensive processing module is used for performing format conversion on the rescue information to obtain alarm information and distributing the alarm information to each application platform based on the distress position; the backup service module is used for storing alarm information; and each application platform is in communication connection with the comprehensive processing platform and is used for receiving the alarm information and pushing the alarm information to the front-end display platform.

The invention belongs to the technical field of short-wave communication, and particularly relates to a short-wave sky wave channel propagation parameter optimization method based on antenna directivity, which comprises the following steps: acquiring directivity diagrams of a transmitting antenna and a receiving antenna; determining a propagation path of sky wave rays from a transmitting antenna to a receiving antenna by adopting a numerical ray tracing algorithm; according to the propagation path, calculating free space propagation loss, ionosphere loss and ground reflection loss; performing directional gain correction on the signal intensity on the propagation path according to the directional diagrams of the transmitting antenna and the receiving antenna; calculating the total propagation loss according to the free space loss, the ionosphere loss, the ground reflection loss and the antenna directivity correction value; outputting propagation parameters including the total propagation loss, the propagation path, the antenna directivity correction value and the time delay; according to the method, antenna directivity parameters and propagation path loss are dynamically coupled, and the defect that a traditional model ignores the influence of antenna radiation directivity on signal strength is overcome.

The embodiment of the invention discloses a defect degree judgment method based on short wave excitation non-self-sustaining discharge, and relates to the technical field of electrical insulation detection, and the method comprises the steps: obtaining the non-self-sustaining discharge voltage of an insulator; obtaining a self-sustaining discharge voltage of the insulator; collecting a discharge signal of the insulator under a preset voltage, extracting at least two different discharge characteristic parameters from the discharge signal, and calculating to obtain a discharge activity comprehensive index representing the discharge activity degree; based on the non-self-sustaining discharge voltage and the self-sustaining discharge voltage, a voltage safety margin coefficient is obtained through calculation, and according to the voltage safety margin coefficient and the discharge activity comprehensive index, the defect hazard degree of the insulator is judged; by constructing a voltage safety margin and discharge activity two-dimensional evaluation model, early defects can be accurately identified, defect risks can be quantitatively evaluated, and the accuracy and reliability of evaluation are improved.

The invention discloses an earth surface downlink short-wave radiation space downscaling method based on a super-resolution reconstruction technology, belongs to the technical field of meteorological data analysis, and solves the problems of insufficient solar radiation data space resolution and weak earth surface heterogeneity characterization capability in the prior art. Carrying out super-resolution reconstruction on the radiation data set by adopting a super-resolution combination model, and carrying out weighted fusion on a reconstructed data set output by the super-resolution combination model; according to the method, the output results of the multiple models are subjected to weighted fusion, weight optimization of the super-resolution sub-models is performed in combination with the high-resolution terrain factors, spatial downscaling from 5km to 1km resolution is finally realized, the spatial precision of the solar radiation data is remarkably improved on the basis of keeping the hour-level time resolution of the original data, and the accuracy of the solar radiation data is improved. And more earth surface heterogeneity information can be captured, and meanwhile, the high-time-resolution application requirement is met.

The invention discloses a space short wave intelligent frequency selection system and a space short wave intelligent frequency selection method. The system comprises an airborne communication control system, an air-used short-wave radio station, an air-used short-wave antenna and laser inertial navigation equipment. The method comprises the following steps: an air-used short-wave radio station establishes a frequency forecasting model by using a machine learning technology according to time position information; the air-used short-wave radio station obtains a short-wave frequency band available frequency spectrum hole and puts the hole into a sky wave preselected frequency set, and a current passable frequency band is calculated in combination with a frequency forecasting model; the air-used short-wave radio station selects a frequency point with the minimum local electromagnetic interference from the preselected frequency set of the passable frequency band in combination with the local noise distribution condition to perform frequency selection and link establishment; the two parties store and sort the signal-to-noise ratios of the link establishment frequencies, and link establishment is completed if one pair of receiving and transmitting frequencies of the two parties meets communication requirements; and if not, returning to carry out the frequency selection process again until the frequency meeting the communication requirement is selected. According to the invention, automatic intelligent real-time frequency selection is realized, and the efficiency of frequency selection and link establishment and the passability of an air-service short-wave communication system are improved.

The invention discloses a short-wave time difference positioning method based on particle swarm optimization, which is realized by aiming at a short-wave signal source positioning problem under the condition that ionized layer information is unknown through the following steps of: dynamically screening a receiving station combination with optimal geometric distribution by adopting a particle swarm optimization algorithm based on longitude and latitude and time difference observation data of a receiving station group; taking the main receiving station as a coordinate origin, and converting the geographic coordinates of the selected station into rectangular plane coordinates; constructing a time difference positioning equation set by using a Chan algorithm, and calculating a target position through pseudo-inverse solution and an iteration strategy; and filtering the ill-conditioned solution based on a geometric accuracy factor threshold, analyzing a positioning point cluster through sliding window density, and outputting median coordinates as a final positioning result. According to the method, the receiving station is innovatively selected and modeled as a combinatorial optimization problem, the positioning precision in a complex electromagnetic environment is remarkably improved through a collaborative architecture of particle swarm optimization and a Chan algorithm, and the problem of positioning drift caused by poor geometric distribution of stations in a traditional method is effectively solved.

The invention belongs to the technical field of short-wave radio station control, and particularly relates to a foreign trade short-wave radio station remote control method based on a WiFi link. According to the method, through multi-round data feedback and strategy optimization, the problems of frequency deviation, insufficient power or overload are automatically corrected, the signal distortion and interruption rate are effectively reduced, the high reliability of a communication link is ensured, and based on real-time calculation of an environment interference coefficient and communication compensation information, the transmitting power can be dynamically improved or a more suitable modulation mode can be switched; therefore, the influence of electromagnetic noise on the signal is reduced, the data transmission quality is ensured, flexible adjustment can be performed according to different communication distances, bandwidth requirements or frequency band limitation through a dynamic control strategy, and the rapid deployment and switching requirements of the foreign trade short-wave radio station in multiple scenes are met.

The invention discloses a planar short-wave infrared detector and a preparation method and application thereof. The preparation method comprises the following steps: S1, sequentially growing the buffer layer, the N-type contact layer, the absorption layer, the undoped P-type layer and the cap layer on the substrate; s2, growing a layer of dielectric film on the surface of the cap layer; corroding the exposed cap layer by adopting a wet etching process; s3, removing the dielectric film after corrosion is finished; p-doped Al < 1-w > InwAs is grown in the corrosion area; s4, removing the cap layer and the P-doped Al < 1-w > InwAs on the upper surface of the undoped P-type layer; s5, growing a layer of passivation film on all the exposed upper surfaces; and forming a pattern of a metal contact layer on the surface of the passive film by photoetching to form a P electrode and an N electrode. According to the invention, the problem of high Zn diffusion process difficulty caused by large lattice mismatch between the epitaxial layer with high In component and the substrate is solved, and the performance of the device is improved.

The invention belongs to the field of wireless communication, and relates to a short-wave SC-FDM block iterative equalization method for residual inter-symbol interference cancellation, which comprises the following steps: acquiring a signal yn of a receiving end, and performing FFT (Fast Fourier Transform) on the signal yn to obtain a frequency domain signal Yk; performing feed-forward equalization and MMSE feedback equalization on the signal Yk to obtain a feed-forward equalization signal Zk and a feedback equalization signal Gk, 0; superposing the signals Zk, Gk, 0 to obtain an equalization signal Dk, 0; carrying out IFFT (Inverse Fast Fourier Transform) on the balanced signal Dk, 0 to obtain a time domain signal rn, 0; judging the signal rn, 0 to obtain a judgment signal # imgabs0 #, performing residual intersymbol interference estimation on the signal # imgabs1 #, obtaining a residual intersymbol interference factor # imgabs2 #, and performing feedback equalization on the frequency domain signal Yk according to the factor # imgabs3 # to obtain a feedback equalization signal Gk, 1; superposing the signal Zk and the signal Gk, 1 to obtain an equalization signal Dk, 1; carrying out IFFT (Inverse Fast Fourier Transform) operation on the balanced signal Dk, 1 to obtain a time domain signal rn, 1; according to the method, noise suppression and residual inter-symbol interference cancellation operation are respectively carried out from the time domain and the frequency domain in MMSE feedback equalization, so that the equalization precision is improved.

The invention discloses a half-duplex ultra-wideband ultra-short wave radio frequency device, and relates to the technical field of radio frequency communication, and the device comprises a receiving channel module, a control module, a transmitting channel module, and a transmitting-receiving change-over switch. The control module is respectively connected with the receiving channel module, the transmitting channel module and the transmitting-receiving change-over switch; the transmitting channel module is also connected with the transmitting-receiving change-over switch; the transmitting-receiving change-over switch is also connected with the receiving channel module; the receiving channel module converts a received external radio frequency input signal into an intermediate frequency signal; the control module regulates and controls processing parameters of the receiving channel module and the transmitting channel module, generates a switching signal and sends the switching signal to the receiving and transmitting change-over switch; the transmitting channel module converts a signal to be transmitted into a radio frequency output signal; and the receiving and transmitting change-over switch responds to the switching signal to switch the receiving and transmitting states. The transmitting channel module and the receiving channel module cover the ultra-wideband frequency band, and meanwhile, the signals are processed, so that the influence of interference and noise on the signals is reduced.

The invention provides a segmented adaptive gain-based short-wave band amplitude and phase control device and method, and relates to the field of short-wave intelligent control. The method comprises the following steps: performing coupling detection processing on N paths of input short-wave signals to obtain coupled short-wave signals and power values of the coupled short-wave signals; based on the coupled short-wave signal and the power value of the coupled short-wave signal, calculating adjustment parameters through a preset adaptive segmented multi-target differential evolution algorithm, wherein the adjustment parameters comprise a frequency correction parameter, a phase adjustment parameter and an amplitude control voltage; adjusting the coupled short-wave signal based on the adjustment parameter to obtain a target short-wave signal; and detecting whether the target short wave signal meets a preset output condition, and if the target short wave signal meets the preset output condition, coupling the target short wave signal to output a radio frequency output signal. Through the scheme, the communication quality is improved.

The invention relates to the technical field of semiconductor lasers, and discloses a high-temperature-adaptability VCSEL (Vertical Cavity Surface Emitting Laser) light source which comprises two VCSELs connected in parallel and can respectively obtain high-efficiency light output in low-temperature and high-temperature environments. Wherein the peak value of material gain of an active region of the VCSEL which normally works at low temperature at room temperature is located in the long wave direction of a resonant cavity mode; the peak value of the VCSEL material gain normally working at high temperature is located in the short wave direction of the cavity mode, so that the cavity mode moves towards the peak value of the material gain at low temperature and high temperature to obtain high mode gain. Two paths of lasers emitted by the VCSELs are combined into one path through the optical fiber beam combiner, so that the device can realize stable light output within a large temperature change range, and the temperature monitoring and prediction layer and the adaptive layer are arranged to realize temperature monitoring and prediction and intelligent adaptive adjustment.

The invention discloses a short-wave interference feature extraction method based on ionosphere image processing, which comprises the following steps: step 1, carrying out preprocessing and denoising on ionosphere image data by adopting a digital image processing algorithm; step 2, carrying out analysis and calculation according to frequency spectrum, time domain and space domain information of short-wave signals when interference features are extracted; and establishing an interference feature library, and judging whether the short-wave signal is interfered or not through comparative analysis and feature matching. According to the method disclosed by the invention, the short-wave interference features are automatically extracted through an algorithm, manual intervention is reduced, working efficiency and accuracy are improved, and automation is realized; processing and analysis are carried out based on ionized layer image data, multiple interference factors are comprehensively considered, and the systematicness of interference feature extraction is improved.

The invention discloses a novel floating breakwater-oscillating water column wave energy conversion device integrated system which comprises a breakwater assembly, the bottom of the breakwater assembly is fixed through an anchor chain, an air chamber is arranged in the breakwater assembly, the top of the air chamber is provided with an air hole pipeline, the air hole pipeline is connected with a turbine generator, and the turbine generator is connected with an oscillating water column wave energy conversion device. A permeable structure is fixed to the wave facing side of the breakwater assembly, and a gap is formed between the permeable structure and the breakwater assembly. A permeable structure, an oscillating water column wave energy device and a floating breakwater are integrated, the permeable structure is used for dissipating high-frequency short waves, reducing wave loads acting on the structure and improving the stability and survivability of the structure, and in order to improve the energy dissipation effect of the permeable structure, a certain distance is formed between the permeable structure and an air chamber structure; the OWC wave energy device is used for absorbing long-wave energy for power generation, and the blocking capacity of the integrated system to long waves is improved; through integration of the three, a basic platform is shared, sea area resources are saved, operation and maintenance cost is reduced, and diversification of functions of the integrated system is realized.

The invention discloses an efficient short-wave and radio-frequency broadband converged communication digital signal processing system, belongs to the technical field of communication, and aims to solve the problem that defects exist when existing short-wave and radio-frequency broadband are used independently and in a converged mode. The frequency and bandwidth resource combination optimization system adopts a genetic algorithm to optimize frequency and bandwidth resource combination, and comprises a parameter setting module, a signal monitoring and data collection module, a fitness evaluation module, a genetic algorithm operation module, a termination judgment module and a signal processing and communication module. The method can better adapt to ionosphere changes, reduce signal fading and interruption, effectively cope with external interference and reduce the bit error rate through monitoring signal characteristics and reasonably allocating resources, carries out frequency and bandwidth resource combination optimization by comprehensively considering various factors by applying a genetic algorithm, avoids the problems of short-wave frequency band congestion and insufficient utilization of radio frequency broadband bandwidth, and improves the utilization rate of the radio frequency bandwidth. The fusion of two communication resources is realized, and the overall efficiency of the system is improved.

The invention designs a short-wave over-the-horizon communication comprehensive simulation analysis method for the problems of cascade and comprehensive analysis of antenna radiation characteristics and radio wave propagation environments. The method comprises the steps of performing radiation characteristic simulation on a short-wave antenna, constructing an ionosphere model, simulating a propagation path of a short-wave signal in an ionosphere by adopting a ray tracing technology, integrating antenna characteristics, an ionosphere environment and a propagation mechanism, and calculating falling area energy distribution of the signal. And comprehensive evaluation and analysis of the reachable range of short-wave beyond-visual-range communication are realized. According to the method, the signal propagation path and fading characteristics of the signal from the radiation source to the receiving tail end can be comprehensively mastered, and guidance and basis are provided for antenna selection, erection, coverage area analysis and communication quality estimation in practical engineering application of short-wave beyond visual range communication.

The invention relates to the technical field of wireless communication and signal processing, in particular to a short-wave spectrum efficient sampling method and system based on compressed sensing, and the method comprises the steps: collecting full-band power spectrum density data through a low-speed scanning receiver; determining a strong interference frequency point set; generating a binary null observation sequence; loading the binary null observation sequence to an analog front-end frequency mixing circuit, performing analog domain orthogonal frequency mixing and integral processing on the input radio frequency signal, and outputting a voltage sampling value; resolving to obtain a signal sparse coefficient through a compressed sensing reconstruction algorithm; calculating a reconstruction residual error according to the voltage sampling value and the signal sparse coefficient; in response to the condition that the reconstruction residual error is greater than a preset error threshold, triggering a reacquisition process of the power spectral density data; outputting a signal sparse coefficient in response to the condition that the reconstruction residual error is smaller than or equal to a preset error threshold; according to the invention, the problems of limited dynamic range and weak signal submerging are solved, and the receiving sensitivity of weak signals in a strong interference environment is obviously improved.

The invention provides a broadcast antenna ATU input standing-wave ratio automatic adjusting and testing system. A human-computer interface is used for setting a target working program, a working frequency band and initial inductance and capacitance values, and a tuned standing-wave ratio curve and inductance and capacitance values are displayed; the control module decomposes the input initial inductance and capacitance values into rotation turns required by the current motor, transmits the rotation turns to the transmission module, and sends a target working program to the original short-wave antenna system; the transmission module enables the motor to be located at a target position, and correspondingly, target inductance and capacitance values are achieved; the data acquisition module is used for testing the standing-wave ratio of the system, reading the current inductance and capacitance values, recording the maximum value of the standing-wave ratio and sending the maximum value to the data processing module; and the data processing module processes the data and judges whether the current standing-wave ratio meets the requirement or not. According to the method, the automatic test system and the automatic optimization algorithm are combined, so that the workload of debugging personnel is reduced, and the working efficiency of ATU tuning is improved.