93results about How to "Realize anti-jamming" patented technology

The invention provides a digital beam forming and phase fitting method, and aims to provide a method capable of suppressing interference, improving the signal to interference and noise ratio and accurately controlling the phase of a beam forming signal. The method is implemented according to the technical scheme that a steering vector model obtains relative steering vectors by using online calibration, accurate absolute steering vectors are acquired by combining absolute phase responses, which are measured in a darkroom, of a reference array element, model parameters of the steering vector are fitted out by combining the existing absolute steering vectors, and an accurate spare steering vector of an antenna array in any direction is acquired; the second-order statistic of the array signal is iteratively calculated through an array signal statistic hardware calculation module, and sent to an array signal processing algorithm module together with an antenna array steering vector and a channel response to calculate an optimal beam weight; and finally, the array signal processing algorithm module imbeds the optimal beam weight into the digital beam forming module to perform real-time digital beam forming and phase fitting and process multi-channel array data and beam output in real time.

The invention discloses a dynamic spectrum anti-jamming model in a fading environment and an enhanced learning anti-jamming algorithm. The model comprises a transmitter, a receiver and a jammer duringthe dynamic spectrum anti-jamming process of a wireless communication system, wherein the jammer generates jamming signals to jam user communication; the transmitter and the receiver transmit data frames through a data link, and the control information is transmitted through a control link; and the receiver acquires the channel information through data communication and broadband spectrum sensing, and the enhanced learning algorithm is executed for optimizing a channel selection strategy. The algorithm is as follows: a user transmits data on a data channel and obtains the current channel transmission rate, and the return value of the current working channel is calculated; the jamming channel at the current time is obtained through spectrum sensing; a new transmission channel is decided through enhanced learning, a Q value table is updated, and due to such cycle, the state of the optimal strategy can be obtained. The dynamic spectrum anti-jamming problem in the fading environment can be solved, and the throughput of the system is improved.

The invention discloses a general binary migration carrier modulation method of a satellite navigation system signal, which comprises the steps of changing the time occupied by a traditional modulation waveform chip binary value (plus 1 or minus 1) by utilizing a variable parameter Rho based on binary offset carrier modulation so as to realize the flexible modulation of the splitting degree of the existing binary offset carrier modulation mainlobe and the existing binary offset carrier modulation sidelobe and simultaneously realize the code tracking performance, the anti-interference performance, the anti-multipath performance and the compatibility of the signal.

The invention relates to a high frequency radar anti-radio frequency interference method, which detects the interference signal on the radar collected far distance element accumulating Doppler spectrum by the setting signal-to-noise ratio gate and adopts different scan frequency impulse phase modulating modes to reduce the bad effect of the detecting result by the radio frequency interference distribution received by the high frequency radar.

The invention discloses a device and a method for preventing interference of same-frequency channels. The device comprises a first wireless transmitter, a second wireless transmitter, a first wireless receiver, a second wireless receiver, a microcontroller, an antenna and a storer, the microcontroller is connected with other parts respectively, the first wireless transmitter and the first wireless receiver work at a frequency band same as that of the second wireless transmitter and the second wireless receiver, the first wireless transmitter, the first wireless receiver, the second wireless transmitter and the second wireless receiver transmit wireless data through the connected antenna respectively, and the microcontroller controls working state of each of the transmitters and the receivers. By the device and the method, the problem of channel interference in same wireless routing equipment working in different wireless application and same frequency in the prior art is solved.

The invention relates to an improved binary-coded character modulation method of satellite navigation system signals, belonging to the technical field of satellite navigation. On the basis of binary-coded characters, the traditional spread spectrum character is split into K units; each unit uses the character pulse waveform based on MSK (minimum shift keying) instead of the binary value waveform; and proper parameters are selected, thereby having the advantages of interference rejection, multipath resistance and compatibility of the binary-coded character, realizing the constant enveloping of MSK modulation, enhancing the efficiency of the power amplifier, realizing large side lobe attenuation and the like. The invention uses the improved binary-coded character modulation to enhance the code tracking performance, multipath resistance, interference rejection and compatibility with other navigation signals, thereby realizing constant enveloping of signals and avoiding the occurrence of large-amplitude side lobes.

The present invention discloses a distribution automation cabinet including a cabinet body and a plurality of drawer type cabinets. The cabinet body movably connects with the drawer type cabinets, and the drawer type cabinets are arranged in the cabinet body. The distribution automation cabinet is provided with a plurality of functional modules, and the functional modules are assembled in the distribution automation cabinet in a drawer manner for forming drawer unit modules. Compared with the prior art, the distribution automation cabinet provided by the present invention can be used as a standardized product for production, and various functional module equipment in the distribution automation cabinet can also be used as standardized products for production so as to match with any one ring network cabinet group provided by the prior art or available in the market. And the distribution automation cabinet significantly solves a security problem of outdoor opening and closing existed in the prior art, simultaneously, enhances supply electricity continuity of an outdoor opening and closing place, facilitates the development and management of smart power grids of our country, and therefore, the distribution automation cabinet has a wide application prospect.

The invention relates to a simple anti-interference coding method for single-chip microcomputer short-distance wireless communication, and is particularly suitable for occasions with low functional requirements for communication equipment. A start bit of a data frame is represented by a square wave having the same high level duration and low level duration on a sending terminal; a data bit '1' is represented by a square wave having a short high level duration and a long low level duration; a data bit '0' is represented by a square wave having a long high level duration and a short low level duration; a fixed sampling time is set on a receiving terminal to sample the received data waveform; and finally the data bits are discriminated according to the number of the sampled high levels and the sampled low levels. The method achieves the anti-interference purpose of the single-chip microcomputer short-distance wireless communication by a simple data coding method, greatly reduces the probability of wrong data discrimination caused by ingression of interference signals during the data transmission; a small memory space is occupied after programming, and a great memory space is saved for the single-chip microcomputer.

The invention belongs to the field of signal processing, and discloses a large dimension reduction four-channel mainlobe sidelobe interference-resisting method. The method comprises steps: according to data received by all subarrays, a sum beam, a pitch difference beam, an azimuth difference beam, a dual-difference beam and multiple sidelobe interference beams after dimension reduction are formed respectively; interference-resisting weights of the pitches and beams are obtained, and interference-resisting weights of the azimuths and the beams are obtained; according to the dual-difference beam, the pitch difference beam and the azimuth difference beam, an auto-covariance matrix for the dual-difference beam, a cross-covariance matrix for the dual-difference beam and the pitch difference beam and the cross-covariance matrix for the dual-difference beam and the azimuth difference beam are obtained; and the interference-resisting weight of the azimuth difference beam and the interference-resisting weight of the pitch difference beam are solved; and the azimuths, the beams and the azimuth difference beam after interference resistance along the pitch direction are acquired, and the pitches, the beams and the pitch difference beam after interference resistance along the pitch direction are acquired; and sum difference angle measurement is adopted to obtain the target direction.

The invention discloses a high-power IGBT (Insulated Gate Bipolar Transistor) temperature acquisition protection circuit which comprises an IGBT temperature acquisition circuit and an IGBT double one-way hysteresis loop temperature protection circuit, wherein the IGBT temperature acquisition circuit is used for acquiring a temperature of an IGBT element; the IGBT double one-way hysteresis loop temperature protection circuit is used for receiving a signal output by the IGBT temperature acquisition circuit and processing the signal; the IGBT temperature acquisition circuit comprises a temperature acquisition element for acquiring the temperature of an IGBT element; the temperature acquisition element transmits acquired temperature data to a filtering circuit for filtering anti-interference, the filtering circuit transmits the processed data to a differential negative feedback circuit to carry out isolated output and a temperature voltage signal is output; the IGBT double one-way hysteresis loop temperature protection circuit comprises a one-way hysteresis loop low temperature protection circuit and a high temperature one-way protection circuit which are mutually connected in parallel; and the one-way hysteresis loop low temperature protection circuit and the high temperature one-way protection circuit are used for receiving the temperature voltage signal output by the IGBT temperature acquisition circuit by respective operational amplifiers and carrying out processing on the temperature voltage signal. According to the invention, the IGBT temperature is detected in real time; protection measures can be timely taken; and working reliability of equipment is improved.

The invention discloses a power distribution automation cabinet. The power distribution automation cabinet is composed of a cabinet body and a plurality of unit modules. Each unit module is movably connected with the cabinet body in a pulling-out manner and can be internally arranged in the cabinet body. Each unit module is provided with a plurality of secondary elements with different functions. The power distribution automation cabinet comprises a first power distribution cabinet and a second power distribution cabinet. The first power distribution cabinet is composed of a plurality of single-loop control protection unit modules. The second power distribution cabinet comprises a wiring terminal module, a DTU protection integration unit module, an ONU communication integration unit module and a power supply unit module. The first power distribution cabinet and the power distribution cabinet are electrically connected through the wiring terminal module. Compared with the prior art, the power distribution automation cabinet can be produced as a standard product, all function module equipment of the power distribution automation cabinet can also be produced and designed as standard products, and the power distribution automation cabinet can be matched with any kind of ring network cabinet group for usage; in addition, the safety problems of an outdoor switching station are solved, and the power supply continuity of the outdoor switching station is simultaneously improved.

Disclosed is an anti-interference method and system for an on-board millimeter-wave radar. The anti-interference method includes the steps that 1), during driving of a vehicle, a master transmitter of the on-board millimeter-wave radar transmits millimeter waves according to a certain period, and wavelength of the millimeter waves is controlled by a wavelength controller; 2), a receiver of the millimeter-wave radar receives the millimeter waves reflected by obstacles ahead, and wavelength analysis of the millimeter waves is performed through a wavelength analyzer of the millimeter waves; 3), a threshold value b of wavelength variable range is set, and if the wavelength variable range b' of transmitted wavelength y and received wavelength y' is smaller than that of the threshold value b, the current radar system is determined to be interfered by surrounding environment or maliciously and artificially attached.

The invention discloses a parameter agile coding method and system with variable or constant code length based on polarization code. The parameter agile coding method with constant code length comprises the following steps: acquiring the polarization code length to be generated; selecting a preset configuration file according to the polarization code length; acquiring the number of user information bits; generating an information bit channel interface serial number set and a fixed bit channel interface serial number set; generating a first set according to the information bit channel interfaceserial number and the fixed bit channel interface serial number; rearranging elements in the first set to obtain a second set; generating a user information bit sequence number set and a system checkbit sequence number set; acquiring a user information bit sequence; generating an information bit and a system check bit by an exclusive OR operation module; finally, generating the encoded polarization code. The method and the system of the invention can realize on-line agility of the encoding and decoding parameters only by reading the configuration file by using a set of encoders and decoders,and have the advantages of being simple, easy to realize, and fast and flexible.

The invention belongs to the field of radar signal processing, and discloses a sum-difference tracking angle measurement method based on a Nested array. The method comprises the steps: obtaining the echo data of the Nested array, carrying out the vectorization of a covariance matrix of the echo data, and forming single-snapshot receiving data; removing the redundancy of the single-snapshot receiving data, and obtaining the single-snapshot receiving data of a virtual array; carrying out the reconstruction of data; enabling the reconstruction data to serve as the covariance matrix of the echo data of the virtual array when the data contains interference data, and calculating a sum wave beam weight value and a different wave beam weight value after interference resistance; carrying out the data interpolation of the echo data of the Nested array, and forming the echo data of the virtual array; obtaining a sum wave beam and a difference wave beam after interference resistance, and carrying out the sum-different tracking angle measurement; enabling the reconstruction data to serve as the multi-snapshot receiving data of the virtual array when the interference data is not contained, obtaining the sum wave beam and the difference wave beam, and carrying out the sum-different tracking angle measurement according to the sum wave form and the difference wave beam, thereby achieving the accurate sum-difference tracking.

The invention discloses a roadside device RSU, comprising a host and radio frequency units, wherein host is configured to acquire configuration information about short-range communication of the system, configure each radio frequency unit according to a configuration message, respectively configure different channels and frequencies for the the radio frequency units, and maintain communication links with the the radio frequency units; and the the radio frequency units are configured to broadcast system information and communicate with an OBU by using the configured channels and frequencies. The roadside device RSU disclosed by the invention solves the problems of single RSU channel, low communication efficiency and poor communication security reliability in the prior art. The invention also discloses a system configuration method of the roadside device RSU.

The invention provides an EoC load balancing method and system and EoC local side equipment. The EoC load balancing method is applied to an EoC communication system comprising an EoC local side deviceand an EoC terminal device. The EoC load balancing method comprises the steps that the EoC local side device comprises at least two local side CLT modules; The local side CLT modules work in different frequency bands respectively and transmit and receive synchronously; Wherein the EoC terminal equipment can work in a frequency band corresponding to any local side CLT module in the EoC local sideequipment which correspondingly communicates with the EoC terminal equipment; And the EoC local side equipment coordinates the EoC terminal equipment carried by each local side CLT module according toa load balancing principle. According to the invention, the load balancing problem of the EoC local side equipment is solved, the interference resistance of the EoC terminal equipment is realized, and the communication quality of an EoC communication system is greatly improved.

The invention discloses an invisible fish blocking system based on the Internet of Things, and relates to the technical field of networked equipment used in water area aquaculture. Its main controller is connected to multiple node controllers respectively through the bus, the main controller is connected to the router through wireless transmission, the router communicates with the coordinator through wireless transmission, the coordinator communicates with the PC serial port, and the main controller is connected with an alarm module , the main controller is also connected with an electric control switch group, the node controller is connected with a temperature sensor, the temperature sensor is connected with the electronic switch module, the electronic switch module is connected with the node controller, and the electronic switch module is connected with the controlled boost module. The controlled boost module is connected to the energy storage module, the controlled boost module is connected to the node controller, and the output port is connected to the underwater electrode. The beneficial effects of the invention are: it realizes real-time control of fish blocking in remote waters through wireless transmission, greatly reduces the cost of blocking fish, and can realize unified monitoring of large-scale adaptive waters blocking fish.

The invention discloses an anti-interference method, device and equipment and a readable storage medium. The method comprises the following steps: determining a minimum value and a maximum value in a first working frequency value range of a radio frequency module; calculating a first ratio of the minimum value to the to-be-measured frequency value and a second ratio of the maximum value to the to-be-measured frequency value; wherein the to-be-measured frequency value is the working frequency value of the interference source; and if the difference value between the first ratio and the second ratio meets the preset condition, determining that the to-be-measured frequency value does not interfere with the radio frequency module, and controlling the interference source to work at the to-be-measured frequency value. No matter how the working frequency of the radio frequency module changes, the selected frequency value to be measured does not influence the normal work of the radio frequency module, so that the working frequency of the interference source does not need to be frequently adjusted, the normal work of the radio frequency module and the interference source is ensured, and the anti-interference is realized on the premise of not increasing the hardware cost. The anti-interference device and equipment and the readable storage medium provided by the invention also have the above technical effects.

The invention discloses a magnetic levitation track state comprehensive detection device, and belongs to the field of track measurement. The device comprises a vehicle body connecting seat arranged above a magnetic suspension track, a tool frame arranged on the bottom side of the vehicle body connecting seat and located between the vehicle body connecting seat and the magnetic suspension track, and a measuring set arranged on the tool frame. The measuring set comprises an F rail profile measuring sensor arranged on the tool frame and located over the F rail, a vehicle body posture measuring sensor arranged on the tool frame and located below the vehicle body connecting base, and a plurality of sleeper irregularity measuring sensors arranged on the tool frame and located above the sleepers.According to the invention, the function of quickly and comprehensively detecting the magnetic levitation track and the auxiliary power supply facilities is realized, and meanwhile, the digital laserdetection technology and equipment with accuracy, reliability, safety and high efficiency are adopted, so that the system has the advantages of high accuracy, high reliability, interference resistance, all-weather operation and the like.