34 results about "Meteor burst communications" patented technology

The invention discloses a construction method of a meteor trail communication channel module, mainly solving the problem of seamless compatibility between the traditional channel model with the simulation of the traditional communication transmission mechanism and a key technology. The construction method comprises the following steps of: firstly, dividing a meteor trail communication channel into a sparse underdense subchannel, an underdense multi-path subchannel, an underdense cluster subchannel, a meteor shower subchannel, an over-dense meteor subchannel without Rayleigh fading and an over-dense subchannel containing Rayleigh fading; respectively constructing channel models, wherein the high precision of each subchannel approaches to the physical characteristics of actual representative channel; then combining the six subchannels according to the actually measured statistical probability; and finally, acquiring a channel computer model capable of embodying various physical characteristics of a practical meteor trail channel. The invention has the advantages of simple calculation, easy expansion, easy modification and seamless compatibility link simulation and can improve the communication quality of the meteor trail.

The present invention discloses a multi-channel meteor trail channel simulator, and relates to the transmission environment simulation equipment of meteor trail burst communication channel in the field of communication. The channel simulator comprises a digital control attenuator, a power distribution / synthesis device, a channel simulation unit, a power supply and other components. When in use, the channel simulator is connected in the meteor trail communication channel in series, to simulate the characteristics of the actual meteor trail channel, which comprise the appearance of random burst and the signal intensity of exponential decay; and the channel simulator can be used for simulation testing of various technical indicators of the meteor trail communication channel. The channel simulator also has the advantages of high degree of integration, simple circuit, small size, convenient use, stable and reliable performance, and so on, and is in particular suitable for the meteor trail channel simulator on the occasions of the joint testing of the system, the transmission threshold testing of the equipment, the capacity testing of the network protocol, and so on in the meteor trail communication system network under the condition of the laboratory.

The invention discloses a wavelet packet noise reduction method for a meteor trail communication system, used for performing noise reduction on meteor trail communication signals. The method comprisesthe following steps of: selecting a proper wavelet basis function, performing wavelet decomposition on the signals by using an orthogonal wavelet decomposition algorithm, performing threshold quantization on the wavelet decomposition coefficients by using soft threshold functions, performing signal reconstruction by using a reconstructed function with a specific structure, and realizing the feature extraction of weak signals in the background of strong noise. The method disclosed by the invention is capable of obviously improving demodulation signal-to-noise ratio of the meteor trail communication system, enhancing the detection and utilization abilities for the weak signals, shortening the communication waiting time and improving the information transmission capacity, and is especially suitable for application scenarios in which the meteor trail communication signals are drown by strong background noise.

The present invention discloses an SMRD-based meteor trace track simulator and relates to the field of meteor track test application. The simulator comprises a first interface matcher, a first splitter / combiner, a numerical control attenuator, a second splitter / combiner, a second interface matcher, a first noise generator, a signal controller, a second noise generator and a monitoring unit. Based on the SMRD data developed by radar observation of meteors for several decades, the present invention combines the meteoroid operation rule with meteoric tracks from the aspects of meteor generation, generation and diffusion of available tracks, electrical characteristics of tracks and electromagnetic environment for meteor trace track simulation. This can be close to the application environment and reflect the transmission characteristics of the track more truly. The invention has the characteristics of high integration and simple circuits, is convenient in use, stable and reliable in performance. The simulator is especially suitable for testing and validating the actual link transmission capability through the laboratory environment and can also be used for the joint test and communication capability test of newly developed meteor trace equipment.

The invention discloses a novel multichannel meteoric trail channel simulator, which is a simulation device of a multichannel meteoric burst communication channel transmission environment in the field of communication. The novel multichannel meteoric trail channel simulator is composed of a multiplexer switch, a power distribution synthesis unit, a splitter and combiner unit, a numerical control attenuator, a control unit, a communication interface unit, a channel switching interface unit, a channel simulation processing unit, a storage unit, a power supply and other components, and is serially connected in devices of a meteoric trail communication system to simulate the influence of an actual meteoric trail channel on a signal, so as to test and check the performance indexes, link performance, networking functions and the like on newly researched meteoric trail communication devices in a laboratory environment. The novel multichannel meteoric trail channel simulator disclosed by the invention further has the advantages of high integration degree, small volume, convenient use, stable performance and the like.

Disclosed is a meteor trail communication system self-adaptation encoding method based on TPC-RS. A self-adaptation encoding method based on a meteor trail communication system is modified, and the meteor trail communication system self-adaptation encoding method based on the TPC-RS is a self-adaptation code transmitting method based on the TPC-RS of receiving signal-noise ratio estimation. According to the rule that meteor trail channel energy changes along with the time in an index mode, under a constraint condition of a bit error rate of the system, and through the meteor signal receiving signal-noise ratio estimated in real time, the code rate redundancy of TPC-RS encoding of the system is dynamically changed, self-adaptation change of the information rate is achieved, and the utilization rate of a meteor trail channel is effectively improved. The simulation result and analysis show that under the same channel condition, the self-adaptation method can obtain 3.68dB system gain when the error bit rate is 2*10<-4 > compared with fixed code transmitting efficiency, and the data throughput is doubled.

The invention discloses a method for realizing meteoric trail communication network simulation based on a GIS (Geographic Information System) system, and belongs to the technical field of communication. In traditional meteoric trail communication network simulation, functions are only limited to prediction of network connectivity, and the method is provided for further providing systematic decision support. The method is composed of three main modules of channel simulation, transmission parameter calculation and decision analysis, on the basis of a meteor trail communication network planned ina GIS platform, the three modules are operated in sequence, channel simulation data, transmission parameter data and a decision report are output, operation is convenient, and the result is visual. Software simulation of a meteoric trail communication network is achieved. A good human-computer interface is achieved, the information transmission situation in the whole network can be efficiently and rapidly simulated, and a basis is provided for construction and use of the meteoric trail communication network.

The invention discloses a meteoric trail communication modeling simulation system which relates to a meteoric trail burst communication system simulation apparatus in the field of communication. The meteoric trail communication modeling simulation system comprises parts: a channel simulator, a transmitter, a receiver, a data source generator, a counter and the like. The meteoric trail communication modeling simulation system has authenticity, can simulate year, month and day change laws of a meteoric trail, and can reflect a topological structure and an operation condition of an actual meteoric trail communication network; the meteoric trail communication modeling simulation system has expandability, and can simply and conveniently construct network forms with different scales and topological structures; and the meteoric trail communication modeling simulation system has maneuverability, is provided with an excellent human machine interface and is convenient to change simulation parameters and observe and display a result. According to the simulation system disclosed by the invention, by loading a link, an internetworking protocol and the like of the meteoric trail communication network, the entire communication process can be efficiently and rapidly simulated. The meteoric trail communication modeling simulation system is particularly suitable for evaluating performance of the meteoric trail communication link and network, a meteoric trail communication network protocol system is optimized, and basis is provided for building and use of the meteoric trail communication network.

The invention discloses a meteor burst communication protocol processor based on the estimation of signal-to-noise ratio, and relates to a meteor trail signal channel protocol processor with the strong anti-burstiness and the rapid fading resistance, and belongs to the communication field. The processor comprises a packetizer, an organization and sending device, an encoder, a sending selector, a signal channel detector, a rapid synchronizer, a decoder, a receiving and combination device, an unpacketizer, a receiving responder and a sending responder. The processor firstly estimates the signal-to-noise ratio before sending the data, and determines if the encoding and the punching is required; a receiving terminal adopts the technology of the data receiving and combination to carry out the self-decryption or the joint decryption on the received data and complete the processing of the meteor burst communication protocol. The invention also has the advantages of high integrated degree, simple circuit, small volume, convenient application and stable and reliable performance. The invention is especially suitable for the meteor trail signal channel protocol processor with the strong anti-burstiness, the rapid fading resistance and the short signal channel existence period.

The invention relates to a meteoric trail communication channel selection auxiliary device. The meteoric trail communication channel selection auxiliary device comprises a microprocessor; the microprocessor is connected with a signal processor, a touch screen controller, a GPS receiver and a FLASH ROM; the microprocessor, the signal processor, the touch screen controller, the GPS receiver and the FLASH ROM are all connected with a power supply; the signal processor is connected with a channel receiver; and the channel receiver is connected with an antenna. Relative to the prior art, the provided available communication frequency points or frequency bands are mainly based on lots of historical communication records, and the historical communication records are stored in the FLASH ROM and directly read by the microprocessor. The microprocessor provides important reference for selection of meteoric trail communication channels through statistic analysis and set operation. Moreover, the device provided by the invention is simple and easy to use, and people lack of professional basic knowledge, such as meteoric trail communication, also can easily operate and use the device. The device is compact in structure, very portable, resistant to severe natural environment, such as high temperature, severe cold and plateau low pressure, and suitable for being used under various geographical environment conditions.

The invention discloses an ultrashort wave multimode over-the-horizon modem and method, and a communication device, and belongs to the technical field of communications. The modem provided by the invention comprises an FPGA (Field Programmable Gate Array) for implementing a link control module, a modulator, a pattern recognition module, and a demodulator. The invention can fully utilize a plurality of channel resources to make up for the short-range communication weak zone of meteor trail communication, and can be applied to a multi-mode adaptive wireless communication system of 0-2000 km.

The invention discloses a full-duplex meteoric trail communication device based on a single antenna, and relates to the field of meteoric trail communication. The device comprises a link controller, a modem, a transceiver, a power amplifier, and a diplexer. The device employs the diplexer which is large in withstood power, is small in incoming loss, and is high in receiving and transmitting isolation. A receiving channel and a transmitting channel are combined into one full-duplex channel under the condition of guaranteeing the communication performance of a system. The full-duplex communication between different meteoric trail communication devices can be completed through one antenna, thereby reducing the number of antennas, reducing the requirements for an antenna construction field, and shortening the starting construction time of meteoric trail communication. The device is large in withstood power, is high in receiving and transmitting isolation, is simple and convenient in starting construction, is high in integration degree, is stable and reliable in performance, is especially suitable for a meteoric trail communication occasion where the antenna construction field is limited and there are special requirements for starting construction.

The invention discloses a self-adaptive variable rate device for burst asymmetric channels, and relates to burst asymmetric communication systems in the field of wireless communication, in particular to a meteoric trail communication system. The self-adaptive information transmission of rate can be completed according to channel fading in a short period of time. The device comprises a demodulator, a modulator, a variable rate protocol control unit, a signal-to-noise ratio estimation unit and a power supply; the signal-to-noise ratio estimation of received signals is completed, the received signals are sent to an opposite terminal through the channels, and the sending rate is controlled according to the signal-to-noise ratio of the opposite terminal and the characteristic of channel fading. According to the device, the whole communication rate is adaptively matched with the channel condition, so that the communication rate is approximate to the instantaneous channel capacity, and the information throughput of a wireless communication system is improved; moreover, the speed is self-adaptively reduced for transmission under the condition of low signal-to-noise ratio, the requirement of the system for receiving signal level is lowered, the utilization rate of small signals is improved, and the average waiting time of communication is greatly shortened.

The invention relates to a communication system IEMI vulnerability evaluation system and evaluation method, and aims to solve the problems that an electromagnetic environment and a use scene close to a real environment cannot be simulated in a test environment in the existing research for evaluating the influence of an electromagnetic pulse on the performance of a communication system. Due to the high integration of actual equipment, an electromagnetic pulse conduction coupling mechanism and communication performance index fine measurement cannot be further researched. The system comprises a communication system, an IEMI environment library, a traditional communication interference waveform library, a channel model library, a simulation environment parameter control module and an effect index evaluation and analysis module; the communication system comprises short-wave communication, ultra-short-wave communication, meteoric trail communication and covered wire communication; each communication is composed of a transmitter and a receiver, and each of the transmitter and the receiver is composed of a baseband signal processing unit and a radio frequency channel model library. The evaluation method comprises coupling conduction analysis of IEMI electromagnetic interference and / or evaluation of influence of key vulnerable components on performance degradation of the communication system.

The invention discloses a method for realizing meteor trail communication network simulation based on a GIS (Geographic Information System) system, belonging to the technical field of communication. In the traditional meteor trail communication network simulation, the function is limited to predicting network connectivity. In order to further provide systematic decision support, this method is proposed. The method consists of three main modules: channel simulation, transmission parameter calculation, and decision analysis. On the basis of the planned meteor trail communication network in the GIS platform, the above three modules are run in sequence to output channel simulation data, transmission parameter data and Decision-making report, convenient operation and intuitive results. The invention realizes the software simulation of the meteor trail communication network, has a good man-machine interface, can efficiently and quickly simulate the information transmission in the whole network, and provides a basis for the construction and use of the meteor trail communication network.

The invention discloses a multi-rate modem device based on burst communication, which relates to a burst communication system in the field of meteor trail communication, and can complete timing synchronization of received signals in a short time. It includes a modulator, a demodulator and a power supply; the present invention mainly completes the codec, modulation and demodulation of transmission information. The present invention proposes two innovations: multi-rate parallel demodulation technology and fast timing synchronization technology. Through the analysis of the above-mentioned innovations, it is proved that the device can work reliably in the meteor trail burst communication system. Through practical application, it is proved that this device has good practical effect.

The invention provides a communication method of a meteoric trail communication system and a conformal array antenna. The method is applied to the conformal array antenna. The conformal array antenna comprises at least one conformal antenna array, each conformal antenna array comprises a plurality of patch array sub-antennas, and when a signal is received, electromagnetic wave signals respectively received by a plurality of patch array sub-antennas of the conformal antenna array are obtained, received signal preprocessing is conducted on the electromagnetic wave signals to obtain a plurality of groups of digital signals, and digital beam forming processing and demodulation processing are conducted on the plurality of groups of digital signals to obtain received signals; and when signals are transmitted, signal modulation and power division processing are carried out to obtain multiple groups of digital signals, after digital beam forming processing is carried out on the multiple groups of digital signals, transmitted signal preprocessing is carried out to obtain transmitted signals corresponding to each patch array sub-antenna, and the signals are transmitted through the patch array sub-antennas of the conformal antenna array. According to the invention, the convenience, gain and application range of the meteoric trail communication system are improved.

The invention discloses a meteor trail communication self-interference suppression device and method, belonging to the technical field of communication. The self-interference suppression device of the present invention includes a sending coupler, a variable attenuator, an intelligent interference reconstruction unit, a combiner and a receiving coupler. In order to improve the communication efficiency, the meteor trail communication system mostly adopts the method of frequency division duplexing. Since it works in the VHF frequency band, and the transmission power usually reaches the kilowatt level, in order to ensure the system performance, only a bulky bandpass filter can be used. Conducive to the mobility and cost of the system, the present invention can be directly applied to the meteor trail communication system, installed between the transceiver channel and the ring assembly, to suppress the self-interference signal, which can greatly reduce the self-interference signal in the receiving channel and reduce the receiving filter The indicator pressure of the device can solve the problem of system volume bottleneck.

The invention discloses a meteoric trail communication network-based link recommendation method, and belongs to the technical field of communication. According to traditional communication link recommendation, whether two stations in a network topology are communicated or not is taken as a basis, but when a plurality of passable links are included between a starting station and an ending station,the requirement cannot be met only according to the connectivity. According to the invention, on the basis of network construction and transmission calculation, by referring to a network planning table and combining link transmission parameters, link connectivity and link transmission speed are comprehensively considered, a link path which is effective, accessible and optimal in transmission condition between two stations in the meteoric trail communication network is calculated, and a reference basis is provided for screening of information sending routes in the meteoric trail communication network.

The invention discloses a meteoric trail link planning and predicting method based on a GIS (Geographic Information System), and belongs to the technical field of communication. A meteoric trail channel model is relatively complex in construction process, meteoric phenomena are high in regionality, a traditional meteoric trail link analysis method depends on manual prediction of on-map operation,the workload is large, the prediction efficiency is low, and the result accuracy is poor. In order to solve the above problem, we depend on a GIS platform and analyze and predict the communication quality of the planned meteor trail link in combination with specific elevation data, and the method is completely implemented by a program and is efficient, reliable and convenient. The influence of theactual terrain environment on link opening is fully considered, the meteoric trail station site selection and link planning accuracy is greatly improved, and the meteoric trail station site selectionand link planning method is particularly suitable for communication station site selection and link planning prediction in the meteoric trail communication system design stage in the complex terrainenvironment.

The invention discloses a meteoric trail communication based motorized command system training support device. The meteoric trail communication based motorized command system training support device comprises a receiving unit, a link unit, a channel unit, a sending unit, a channel control unit and a networking control unit. The meteoric trail communication based motorized command system training support device can generate a meteoric trail channel with time delay and error code typical characteristics. The meteoric trail passing process is complex, the search difficulty of channel characteristics is relatively great, a meteoric trail channel with the typical characteristics is generated, and the pertinence to channel research is enhanced; the networking structure of the meteoric trail communication can be simulated in system level, so that the deficiency that the former simulation device not can be connected between a master station and a slave station is made up; the meteoric trail communication based motorized command system training support device can realize control the working mode of an external terminal and can realize control of a whole communication system, so that the deficiencies of single function and poor systematicness of the former simulation devices are made up.

The invention relates to the technical field of communication signal processing, in particular to a meteoric trail communication system single-antenna broadband interference resisting method. The processing process comprises the following steps: receiving a meteoric trail communication system signal by using a multivariate polarization sensitive vector array antenna, and obtaining the output of a multivariate polarization sensitive vector array; performing beam forming on the output of the multivariate polarization sensitive vector array by using a beam former; according to the method, the anti-interference capability is not restricted by antenna mutual coupling, channel consistency, signal quantization precision and self-adaptive coefficient calculation error factors, and the method has stronger interference suppression and signal enhancement capabilities.