425 results about "Short Waves" patented technology

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 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 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 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 relates to the technical field of electronic measurement, and discloses a software instrument system-based short-wave broadcast equipment power automatic calibration system, which comprises a main control unit, a signal excitation unit and a measurement feedback unit. According to the method, an iterative adjustment process is controlled through a main control unit; a measurement feedback unit measures the actual output power of a measured device; and the main control unit directly takes the power difference value as the adjustment amount of the excitation level according to the power difference value between the actual output power and the preset target power, adds the adjustment amount with the current excitation level to obtain the next excitation level, and controls the output of the signal excitation unit until the preset precision is met. According to the method, test link loss calibration is executed before iterative adjustment so as to compensate system errors, a calibration lookup table can be automatically generated after calibration is completed, the problems that a traditional calibration method is low in efficiency and insufficient in precision are solved through an adaptive adjustment strategy and system error compensation, and the calibration accuracy is improved. The method has the beneficial effects of high convergence speed, accurate calibration result and high automation degree.

The invention discloses an impedance matching feed adapter for a ship-borne short-wave antenna, and belongs to the technical field of short-wave antennas. The impedance matching feed adapter comprises a supporting assembly and an impedance matching assembly. The supporting assembly comprises a supporting base, an insulating shell, an insulating frame and an insulator, the supporting base is detachably connected with the insulating shell to form a cavity, the insulating frame is inserted into the cavity, and the insulator is inserted into the supporting base; the impedance matching assembly comprises a core column, an impedance matching coil and a feed connector, the core column is inserted into the insulator, the impedance matching coil is spirally wound on the periphery of the insulating frame, and the feed connector is inserted into the top of the insulating shell. The impedance matching feed adapter for the ship-borne short-wave antenna provided by the invention can integrate an insulating support function and an impedance matching function, can realize reliable insulating support between the short-wave antenna and a ship deck, and also can ensure that the short-wave antenna has good impedance matching in a working frequency band.

The invention belongs to the technical field of radio frequency amplification circuits, and particularly discloses a short-wave receiving amplification circuit capable of realizing cascade transmission and a short-wave communication system. According to the invention, direct current and interference in a previous-level signal are filtered through the filtering module, a pure radio frequency signal is obtained, and a foundation is laid for subsequent processing; the signal strength is improved through the amplification module, and single-stage transmission attenuation is overcome; the key point is that the balance gain module applies gain processing which is compensated for the loss characteristic of a transmission link to the amplified signal, so that the signal strength can be accurately matched with the actual loss of the line, and the problem that a fixed gain mode cannot adapt to the multi-stage series accumulated loss is solved. Compared with the prior art, the scheme realizes stable cascade transmission of short-wave signals through cooperative work of the modules, and remarkably improves the transmission distance and reliability of the system through dynamic compensation accumulated loss.

The embodiment of the invention provides a short-wave full-frequency staring-distributed cooperative frequency, channel and link measurement method. The method is applied to the field of short-wave measurement, and comprises the following steps: performing multi-phase filtering on a received broadband signal to obtain a multi-channel signal; determining signal power and noise power of the multi-channel signal, and determining frequency availability according to the signal power and the noise power; selecting an available frequency according to the frequency availability, measuring through a linear frequency modulation signal transmitted in a channel to obtain a channel characteristic parameter, and determining the channel availability according to the channel characteristic parameter; signals with different waveforms are transmitted in a specified link, link characteristics are obtained through measurement, and link availability is determined according to the link characteristics; the frequency availability, the channel availability and the link availability are subjected to statistical analysis to obtain a statistical analysis result, data support is provided for multi-link cooperative transmission strategy adjustment and link access decision, and the efficiency and reliability of short-wave communication are improved.

The invention relates to the technical field of short-wave signal positioning, and discloses a short-wave positioning method based on a genetic algorithm, which comprises the following steps: acquiring continuous sampling data streams of broadband receivers of multiple receiving stations, and generating a multi-scale data segment sequence; extracting multi-scale time-frequency domain features, and analyzing instantaneous energy density distribution and a phase evolution trajectory; recognizing a burst signal based on spatial-temporal clustering of an energy peak value, and outputting a burst signal segment set; extracting a multi-scale time-frequency feature vector from the burst signal segment, and constructing a local manifold structure; mapping the burst signal features to a statistical manifold, and calculating an accurate time difference; solving a target position by adopting a genetic algorithm based on the manifold geometry; calculating an uncertainty propagation path on the manifold, and outputting a positioning confidence ellipse with geometric correction; the method effectively compensates for manifold incompleteness caused by sparsity of the burst signals, overcomes the defect that a traditional method cannot accurately establish a geometrical relationship between the signals, and solves the problem that the positioning precision of the burst signals is low.

The invention discloses a communication link automatic selection and concurrent transmission method under a helicopter limit condition, and relates to the technical field of aerospace. Comprising the following steps: firstly combing airborne communication link information, retaining four types of links including a satellite, an ultra-short wave, a short wave and a data transfer radio, and collecting parameters by means of a bus controller; filtering the data by using a Kalman filtering algorithm, and removing abnormal data through threshold verification; and finally outputting stabilized data. Determining a task scene and an environment scene based on the stabilization data in combination with airborne control screen task selection and environment sensor data; according to the technical key points, a fault precursor monitoring technology is adopted, a standby link pre-activation technology is combined, a seamless switching mechanism is matched, the defect that an existing system depends on manual switching is overcome, the automatic switching time of the link is shortened to be within 0.5 second, the communication interruption rate under the limiting condition is reduced to be lower than 5% from 30% or above, the real-time communication requirements of rescue, patrol and the like are met, and the real-time communication efficiency is improved. Good use prospects are realized.

The invention provides an attitude control system for a short-wave satellite, and relates to the technical field of data processing, and the attitude control system comprises the steps: inputting a three-axis synthesis control torque instruction into a reaction flywheel controller, converting the instruction into a flywheel motor rotating speed adjustment instruction, and driving a reaction flywheel to execute; adjusting and analyzing the continuously updated attitude deviation angle based on the actual attitude change after the execution of the driving reaction flywheel, obtaining the updated gain parameter of the sliding mode controller, and feeding back the parameter of the updated sliding mode controller; performing control based on the updated parameters of the sliding mode controller, performing direction consistency verification on a newly output sun direction vector measurement value, and verifying an actual included angle; if the actual included angle is smaller than the preset precision threshold value, a new round of data acquisition cycle is triggered, and closed-loop control is achieved. According to the invention, the timeliness and effectiveness of attitude control are ensured, and the control efficiency and reliability are improved.

The invention discloses a roof component based on evaporation and radiation collaborative cooling and preparation and construction thereof. The roof component breaks through the limitation of a single cooling mode through a multi-layer structure coupling evaporative cooling and radiation cooling technology. The reflective film specifically comprises a base layer, an evaporation radiation synergistic cooling material layer and a reflective protection layer. The synergistic material layer is formed by modifying polyacrylamide hydrogel through lithium bromide moisture absorption salt, titanium dioxide nanoparticles are embedded to improve the short-wave reflectivity and long-wave emissivity, and the synergistic material layer has the functions of radiation cooling and moisture absorption evaporation; the reflective protective layer is made of polyvinylidene fluoride-hexafluoropropylene copolymer, so that radiation cooling power is supplemented and pollution is prevented on the premise of moisture permeability; the heat entering a room is reduced by combining an evaporation radiation synergistic cooling material and a reflection protection material; by means of the roof component based on evaporation and radiation collaborative cooling, the limitation of cooling power can be broken through, the cooling effect is enhanced, and the purpose of building energy saving is achieved.

The invention relates to the technical field of medical equipment manufacturing. More specifically, the invention relates to an ultra-short wave therapeutic apparatus production consistency control method and system, and the method comprises the steps: building a virtual digital twin model according to the design parameters of an ultra-short wave therapeutic apparatus, and the model comprises a circuit model, an electromagnetic field model and a thermal model; various parameters of production equipment and products are collected in real time, and the collected parameters are compared with theoretical parameters in the digital twinborn model to determine the difference between the parameters; adjusting the parameters of the production equipment according to the difference so as to compensate the parameter drift of the component; and receiving radio frequency power data of the directional coupler, and calling an iterative learning control algorithm to optimize the driving voltage curve so as to realize dynamic adjustment of the radio frequency power. According to the scheme, the consistency and reliability of products are effectively improved, the production process is optimized, and quality tracing is achieved.

The invention discloses a filtering antenna design method of a naked mole algorithm based on SHAP, and relates to the crossing field of a radio frequency front end of a wireless communication system and a computer algorithm. According to the method, the SHAP value is utilized to quantify the influence of the antenna structure parameters on the antenna performance, the search strategy in the NMRA is dynamically adjusted, and the exploration capability of the algorithm in a high-dimensional space is enhanced. Firstly, the SHAP value of each antenna parameter is initialized, and then the NMRA algorithm stage is entered. In the working stage, SHAP weighted differential evolution is carried out, and in the breeding stage, all breeders update their own states according to a certain probability, and breeders with poor performance are eliminated; self-adaptive variation is carried out according to the probability pm so as to prevent from falling into local optimum; and finally, evaluating the new population, updating the current optimal solution, and outputting the optimal solution after the maximum number of iterations is reached. The method is mainly applied to the fields of short-wave satellite communication, radars and the like, the limitation that a uniform search strategy is adopted for all features in the high-dimensional optimization problem of a traditional NMRA algorithm is overcome, and it is guaranteed that the performance of a filtering antenna is good.

The invention discloses a sea surface vessel detection method and system based on tri-modal attention fusion. According to the invention, visible light, short-wave infrared and medium-wave infrared images are fused, and the problem of missing detection of existing single-mode ship detection under complex sea conditions such as haze, night and thermal interference scenes is solved; according to the invention, multi-level features of a three-mode image are extracted through a backbone network, multi-feature interaction is realized through a double-path deformable attention fusion module, texture-thermal radiation feature complementation is realized, and fusion output is distributed in combination with adaptive weight; in consideration of the problem of poor night short wave infrared data quality, a medium wave dominant degradation fusion strategy is designed, it is ensured that only visible light and medium wave infrared interaction characteristics are used in a night mode, and the influence of low-quality data on model performance is avoided. According to the improved DH-DINO algorithm provided by the invention, the multi-scale information capturing capability can be enhanced, and the problems of modal information redundancy and insufficient complementarity of ship detection under complex sea conditions are solved.

The invention relates to the field of Morse telegraph communication, and discloses an AI-driven Morse telegraph automatic reading and sending method and system, which realize automatic sending and automatic reading in the Morse telegraph communication process in the field of short-wave communication. The method is realized through a full-automatic message reading and sending process: automatically sending a message, converting a message text into a Morse code sequence, and controlling a radio station to send the Morse code sequence; automatically copying and reporting, sampling a Morse audio signal output by a short-wave radio station, and decoding, reasoning and predicting a message text based on an AI model; in communication control, a half-duplex communication protocol is adopted to coordinate a full-automatic transceiving process. The invention also designs an AI-driven Morse telegraph automatic reading and transmitting system, which comprises a central processing module for executing half-duplex communication protocol logic; the telegraph sending module is used for controlling the PTT interface of the radio station to generate a pulse for sending a telegraph; the telegraph receiving module is used for converting the Morse analog audio signal into a digital audio signal; and the AI decoding module is used for reasoning and predicting a message text through a training model.

The application discloses an ionospheric parameter inversion method and system based on short-wave time difference information. A plurality of near-distance receiving stations are used to form a receiving station cluster, so that the reflection area of the short-wave propagation path corresponding to each receiving station in the ionosphere is approximately a common ionospheric reflection area, and a same set of F2 layer parameters is used to describe the ionospheric state of the area. The application obtains the observation time difference of each receiving station relative to a reference receiving station, performs ray tracing forward in a candidate parameter space to obtain the theoretical group path of each receiving station and calculate the theoretical time difference, searches for optimal ionospheric parameters by taking the error minimization of the observation time difference and the theoretical time difference as a criterion, and realizes the inversion of the F2 layer critical frequency, the peak height and the half thickness of the common ionospheric reflection area. The application uses the relative time difference between the receiving stations to replace the absolute propagation time delay for inversion, eliminates the influence of non-ionospheric factors such as the unknown transmission time, system delay and receiver clock difference, and improves the inversion precision and reliability.

The present invention discloses a method for identifying sudden ionospheric disturbance events based on ionospheric vertical sounding data, comprising the following steps: Step 1, collecting and organizing fmin and foF2 data from each ionospheric observation station during a historical M5.0 solar flare eruption that occurred during daytime in my country; Step 2, calculating the ratio of fmin to foF2 data at each ionospheric observation station at the corresponding time, statistically analyzing the distribution of fmin / foF2, and determining the different intensity levels of ionospheric absorption at each ionospheric observation station; Step 3, determining the intensity level of the sudden ionospheric disturbance event. The method for identifying sudden ionospheric disturbance events disclosed by the present invention utilizes the minimum echo frequency of the ionospheric vertical sounding ionogram and the ionospheric critical frequency to calculate an absorption index representing the degree of ionospheric absorption. This method can simply and directly characterize the degree of ionospheric absorption in a certain region and can provide ionospheric absorption information for different regions of my country for shortwave and other electronic information systems.

1. Name of the product in this design: Shortwave Therapy Device. 2. Purpose of this design: Medical device for promoting tissue recovery and treating diseases. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1.

A preparation method of a germanium substrate 2-2.3 mu m short wave low reflection film system comprises the following steps: S1, cleaning of the germanium substrate as a lens and an accompanying plating piece, the accompanying plating piece being a round piece and a wedge-shaped piece; S2, loading the lens into a tool clamp, and hanging the tool clamp into a cavity; S3, vacuumizing and cleaning a Hall ion source; S4, sequentially coating each film layer on a first surface of the lens according to 34.8 nm SiO / 64.3 nm Ge / 52.2 nm ZnS / 272.8 nm SiO, electron beam heating evaporation of SiO film layers and Ge film layers, resistance heating evaporation of ZnS film layers, a deposition rate of the SiO film layer being 0.6 nm / s, a deposition rate of the Ge film layer being 0.3 nm / s, a deposition rate of the ZnS film layer being 0.8 nm / s, and ion source assisted deposition; S5, cooling the cavity, and taking out the tool clamp together with the lens; and S6, repeating steps S1 to S5 to coat the same film system on a second surface of the lens, wherein the wedge-shaped piece is not cleaned when repeating step S1, and is not put into the tool clamp when repeating step S2.

The utility model discloses a vehicle-mounted short-wave double-loop antenna lodging device, which comprises a case, a driving assembly, an antenna fixing platform and a rotating arm, the driving assembly is arranged in the case; the antenna fixing platform and the case are oppositely arranged, and the antenna fixing platform is provided with an antenna large-ring oscillator mounting interface, an antenna small-ring oscillator interface, an antenna supporting rod mounting interface, an antenna large-ring oscillator antenna adjustment connecting port and an antenna small-ring oscillator antenna adjustment connecting port; the antenna large-ring oscillator mounting interface is connected with the antenna large-ring oscillator antenna tuning connector; the antenna small ring oscillator interface is arranged at the center of the antenna support rod mounting interface and is connected with the antenna small ring oscillator antenna adjustment connector; and two ends of the rotating arm are respectively connected with the case and the side wall of the antenna fixing platform. According to the utility model, the installation height of the dual-ring antenna can be effectively reduced, so that the impact, vibration and wind resistance borne by the dual-ring antenna are reduced.

The present application relates to the technical field of channel prediction, in particular to a field strength prediction method and system based on short wave broadcasting, comprising the following steps: acquiring frequency sequence data, calculating jump rate, labeling predetermined jump characteristic frequency band, combining geographical and ionospheric elements to identify path height variation, extracting reflection angle and power change mapping deformation area, and superimposing directivity and strain intensity to predict field strength interval map. In the present application, by synchronously associating geographical space and ionospheric state elements on the basis of frequency sequence feature recognition, the trend of reflection path height variation is mapped through frequency jump behavior, field strength prediction value extraction and directivity attenuation superposition processing under spatial grid granularity are realized, multi-source correlated data is used as support to calibrate the field strength distribution interval of the prediction area, the adaptability and prediction resolution of field strength evaluation under non-static propagation conditions are enhanced, and a prediction framework with time-varying recognition, path feedback and power decrement linkage capability is constructed.

The invention discloses a design method for controlling interaction of a plurality of radio stations under short-wave networking, which comprises the following steps of: in a starting stage, acquiring radio station fixed parameters of all network control console sides; sending an application subscription protocol to all radio stations on the network console side; sending all successfully planned short-wave frequency sets to the successfully subscribed radio stations, and pre-tuning the frequency sets by the radio stations; sending other parameter configurations of the radio station to the radio station which is successfully pre-tuned, and sending a setting result after the radio station is successfully set; after a task execution command is sent out, service switching is carried out; selecting a proper transmitting radio station group; a transmitting frequency point of each transmitting point is selected through an ionosphere propagation prediction model frequency selection algorithm, and the frequency and the bandwidth of the current service are modified at the corresponding radio station; state reports of the selected radio station groups are compared, and the same service content information is uniformly sent to the ready radio stations within a certain time; according to the scheme, the wireless transmission efficiency under networking is improved, and the diversity combining effectiveness is improved.

The present disclosure relates to a supercontinuum generation system, device and equipment, the supercontinuum generation system comprising: a femtosecond pulse generation module and a spectrum expansion module. The input end of the femtosecond pulse generation module is used to receive a femtosecond seed pulse, and the femtosecond pulse generation module is used to perform time domain shaping, amplification or reduction and compression on the femtosecond seed pulse to generate a femtosecond pulse. The spectrum expansion module comprises a first optical fiber segment, a second optical fiber segment and a self-reference interference unit. The first optical fiber segment is used to perform high-order soliton self-compression on the femtosecond pulse. The second optical fiber segment is used to broaden the spectrum of the femtosecond pulse under near-zero dispersion conditions to generate a first supercontinuum by frequency doubling. The self-reference interference unit is used to align the first long wave and the first short wave of the first supercontinuum in the time domain. After the first short wave is coaxial with the first long wave after frequency doubling, the self-reference interference unit outputs a target supercontinuum. Thus, the present disclosure realizes that the output supercontinuum has high flatness and high coherence.

This invention provides an automatic tuner for a loop antenna used in shortwave communication, belonging to the field of shortwave communication technology. This tuner aims to solve the problems of existing automatic tuners for loop antennas, such as difficulty in balancing versatility and high power performance, and poor high-voltage withstand capability. The tuner includes: a matching circuit, which includes couplers for shunting forward and reverse radio frequency signals; a tuning actuator, which includes an oil-immersed variable capacitor and a drive mechanism; and a main control circuit. Based on the signal shunted by the coupler, the main control circuit autonomously calculates the standing wave ratio (VSWR) and generates a control signal to control the matching circuit and tuning actuator independently of the radio transceiver, thus completing automatic tuning. This invention improves voltage withstand and power handling capability by using an oil-immersed variable capacitor, and achieves universal tuning through the autonomous control of the main control circuit, overcoming the shortcomings of existing technologies and offering the advantages of high power, high reliability, and strong versatility.

The application belongs to the field of OFDM channel estimation, and relates to a data-assisted short-wave OFDM sparse channel Turbo iteration estimation method, which comprises the following steps: S1, receiving a signal transmitted through a channel and processing the signal to obtain a receiving end symbol matrix Y; S2, performing channel estimation and equalization on Y to obtain an estimated channel and an OFDM signal pair, and performing Turbo iteration on the estimated channel and the OFDM signal pair to obtain a symbol variance; S3, selecting a virtual pilot in the signal according to the symbol variance; S4, performing channel estimation and equalization on Y according to the virtual pilot to obtain a current estimated channel and an OFDM signal; S5, performing Turbo iteration on the signal to obtain a current symbol variance; and S6, if a preset maximum iteration number is reached, obtaining a final estimated channel; otherwise, returning to step S3 to select a virtual pilot in the signal according to the symbol variance; and the application selects a virtual pilot in the signal according to the symbol variance, and uses the virtual pilot to perform estimation again, so that the spectral utilization rate is improved and the channel estimation performance is improved.

The application discloses a kind of real shortwave protocol sample data processing methods, comprising: obtaining real shortwave protocol sample data set;By anti-fading energy detection method, the burst signal in real shortwave protocol sample data set is sequentially intercepted, and burst signal set is formed;If it is judged that the burst signal is real sample, the center frequency of the real sample is obtained, and the real sample is converted into I / Q burst signal by frequency conversion according to the center frequency;The sampling rate of I / Q burst signal is obtained, and the corresponding low-pass filter is selected according to the sampling rate, and the I / Q burst signal is filtered out by low-pass filter to remove the out-of-band redundant information;The signal amplitude and signal phase between I and Q of I / Q burst signal are sequentially calculated, and the training data is formed according to the arrangement mode of amplitude and phase interleaving.It can solve the problem that the data specification of real shortwave communication protocol in the prior art is not standard, the data amount is not balanced, and the training difficulty is great.