223results about How to "Improve anti-jamming" patented technology

The invention provides a communication link used for a telemetry and telecontrol communication system. An uplink broadcasing and downlink TDMA (time division multiple access) mode is adopted to solve the measurement and control problems of a single ground station for multiple aircrafts. A downlink adopts hybrid spread spectrum BPSK (binary phase shift keying) with multiple stages of adjustable gain for modulation, an uplink adopts coded spread spectrum QPSK (quadrature phase shift keying) with fixed gain for modulation, so that the anti-interference, anti-interception and anti-capturing capacity of a wireless link is improved, and asymmetry of the uplink and the downlink is considered. Both the uplink and the downlink adopt a single-pulse modulation symbol packet transmission mode, a fixed interval is inserted into every two adjacent symbol pulses, and accordingly, the spread spectrum signal capturing, tracking and synchronizing complication of receivers is reduced. Non-coherent demodulation is adopted, a complicated carrier synchronization problem is avoided, and the design and project realization of the receivers are further simplified. The complicated carrier synchronization problem is avoided, and wireless communication between a single ground station device and multiple telecontrol terminal devices is realized.

The invention provides a cylindrical integrated active phased-array antenna. 96 linear radiation arrays are arranged in parallel to form a cylindrical array phase, each linear radiation array includes 8 radiation units and 8 phase shifters, and wave beam scanning in the pitching surface is realized; and each radiation column is connected with a switch array via a T/R assembly, the switch array divides the 96 linear radiation arrays into four groups, and a power amplifier is connected via an circulator. According to the invention, an independent antenna can be used to realize omnidirectional scanning with neither increase of array planes nor addition of mechanical scanning, the complexity and power consumption of an antenna system are reduced, and problems in heat radiation and the like are solved.

The invention relates to an electronic-type current-voltage-combined transformer for a GIS (gas insulated switchgear). The electronic-type current-voltage-combined transformer comprises an external voltage container shell and a suspension potential barrel. A first conductor penetrates through the suspension potential barrel. A Rogowski coil current transformer and a coaxial capacitive voltage divider are mounted on the suspension potential barrel. The coaxial capacitive voltage divider comprises a high-voltage capacitor and at least two low-voltage capacitors. Each low-voltage capacitor forms an output channel. The low-voltage capacitor can be increased to multiple numbers such as two, functions of double-voltage instrument transformer sensing heads, double output and double protection can be achieved, and the electronic-type current-voltage-combined transformer has the advantages of small size, high interference resistance, high precision, high reliability, low cost and the like.

The invention discloses an unmanned aerial vehicle life detection method and system based on a multi-source sensor. The method comprises the steps that S1, an unmanned aerial vehicle carries a multi-source sensor to detect and search a target area, and the multi-source sensor comprises a radar sensor used for detecting a radar image, a visible light image sensor used for collecting a visible lightimage and an infrared thermal image sensor used for collecting an infrared image; S2, signals detected by the sensors are received and fused, and an area with a life detection target in the target area is obtained according to a fusion result; The system comprises a detection search module and a multi-source information fusion module. Rapid and accurate life detection within a large range can beachieved based on the unmanned aerial vehicle, the application range is wide, and flexibility and environmental adaptability are high.

The invention discloses a cognitive radar waveform designing method based on interference and side-lobe equilibrium suppression. The method comprises: on the basis of a self-adaptive framework, in a noise suppressing interference model, and through the MMSE criteria, introducing and structuring a cognitive radar waveform optimization model of interference and side-lobe equilibrium suppression; converting the model into a minimized multivariable and multi-constrained objective function model; then according to Lagrange multiplier method, developing the Lagrange function of the objective function, and according to the principle of duality, converting the model into the optimized dual function again, solved with the introduction of auxiliary variables and the KKT optimality; and finally, designing the alternating iterative method to combine with the optimized emission shape and the filter sequence; and estimating the evaluation of performance brought about by the comprehensive processing algorithm. The simulation results show that the proposed algorithm can realize the balance of the interfering signal suppression and the self-processing side-lobe, which improves the detection performance of the target.

The invention belongs to the fields of chemistry, materials and food safety, and relates to a molecular imprinting ratio fluorescent sensor, a preparation method and application thereof. The preparation method of the molecular imprinting ratio fluorescent sensor includes the steps that molecular imprinting is carried out through sol-gel polymerization, single-component dual-fluorescence emission cadmium telluride/8-hydroxyquinoline zinc nanoparticles provide fluorescence signals, holes after eluting bright blue are recognition sites, a mesoporous structure is formed after hexadecyl trimethyl ammonium bromide is eluted, and bright blue imprinted microspheres with the mesoporous structure are obtained, that is, the molecular imprinting ratio fluorescent sensor based on the single-component dual-fluorescence emission nanoparticles. According to the molecular imprinting ratio fluorescent sensor, preparation and application thereof, the obtained sensor prepared by the preparation method candetect bright blue with high selectivity and sensitivity, and provides color evolution and self-correction functions; and in addition, by effectively adjusting the emission wavelength of the sensor,the molecular imprinting ratio fluorescent sensor can be more widely used in detection of various colored substances.

The invention provides a wireless sensor network. The wireless sensor network at least comprises an information integration equipment layer, an information processing equipment layer and a sensor layer, wherein various sensors of the sensor layer are used for collecting target signals; information processing equipment of the information processing equipment layer serves as superior equipment of corresponding sensors and is used for processing information uploaded by the sensors to facilitate uploading for another time and controlling the sensors; information integration equipment of the information integration equipment layer serves as superior equipment of the information processing equipment and is used for receiving information reported by the information processing equipment and carrying out integration processing on the information to form intelligence information. Preferably, the wireless sensor network further comprises relay equipment used for relaying and forwarding of information between different layers. Preferably, a broadband spread spectrum communication mode is adopted in a network physical layer; a dynamic and static hybrid MAC protocol is adopted in a network link layer according to the type of service. The wireless sensor network is suitable for large-scale layout outdoors, and has high robustness, survivability, anti-interference and a longer life cycle.

The invention discloses a three-oil cup insulating oil withstand voltage tester, which comprises a master control singlechip microprocessor CPU, an input unit and an output unit of the master control singlechip microprocessor, a communication unit and a stepping motor of the master control singlechip microprocessor CPU, wherein, the communication unit is connected with the master control singlechip microprocessor CPU; the output end of the stepping motor is connected with the regulating end of an autotransformer; the output end of the autotransformer is connected with a transformer; the output end of the transformer is connected with two or three insulating detection oil cups in parallel; the positive end and the negative end of each oil cup are connected with high-voltage switches; the negative end of each oil cup is provided with a current signal collector; the output end of the current signal collector is connected with the master control singlechip microprocessor CPU; and a direct current high-voltage static trash separator is arranged on the upper end of each oil cup.

This invention discloses a distributed mutual transfer method and a system, in which, said method includes: a mutual node set transfers radio communication data of the mutual nodes to the objective node by the MIMU technology, said objective node receives and MIMU coding radio communication data from said mutual nodes, said system includes: a mutual node set and an objective node, in which, said mutual node set is composed of at least two mutual nodes and transfers radio communication data of the nodes to the objective node used in receiving and MIMU coding radio communication data from the mutual nodes.

The invention discloses an anti-interference anti-deception ADS-B receiver based on directional antennas, and a receiving method of the anti-interference anti-deception ADS-B receiver. The method specifically comprises the steps: forming an antenna array through a plurality of directional antennas, wherein each directional antenna is connected with a dedicated receiving channel, thereby achievingthe signal amplifying, filtering and mixing; carrying out the demodulation of signals through a dedicated demodulation decoding module, and obtaining the state information of an aircraft; extracting the position information of the aircraft, and enabling a direction calculation module to estimate the direction of an incoming wave through the position information of the aircraft and the position information of a receiver; enabling comparison module to achieve the matching of the estimated direction of the incoming wave with an incoming wave direction range of a directional antenna receiving thesignal, and transmitting a matching result and the state information of the aircraft to a control system through an output module. The method enlarges the coverage of the receiver, solves a problem that a signal cannot be correctly demodulated and decoded during information collision, and improves the anti-interference and anti-deception capability of the receiver.

An alarm for detecting faults of overhead lines of a distribution network comprises a sensor, a signal acquisition unit and a magnetoelectric conversion circuit which are connected with the sensor, a microprocessor which is connected with an output end of the signal acquisition unit, a wireless RF module which is connected with the microprocessor, a power supply control module which is connected with the output end of the magnetoelectric conversion circuit and a power supply which is connected with the power supply control module, wherein, the power supply is respectively connected to the signal acquisition unit, the microprocessor and the wireless RF module. Fault information on the overhead lines and occurrence addresses thereof can be accurately detected and rapidly sent out through the microprocessor and the wireless RF module. The magnetoelectric conversion circuit, the power supply control module and the power supply constitute a magnetic energy conversion mechanism. The alarm can be ensured to work safely and stably for a long time in field through the magnetic energy conversion mechanism.

The invention discloses an RFID bidirectional authentication method. The method comprises tags, a reader and a database. A binary anti-collision search algorithm is improved on the basis that the algorithm is quantitatively analyzed in detail, and the RFID bidirectional authentication method and an anti-interference and anti-collision design scheme of the method are designed. When a plurality of electronic tags enter a radio-frequency range of the reader simultaneously, electronic tags respond to a command of the reader simultaneously and return identity (ID) information of electronic tags, ID signs of the same length are selectively sorted through RFID bidirectional authentication, the congestion of a queue is effectively reduced, and the number of times that the reader accesses electronic tags is reduced to achieve quick positioning and credible identification, so that the high anti-interference and anti-collision capability of an item can be achieved, and the read-write process is stable.

The invention relates to a method for realizing a high-resolution incremental bus-based optical-electricity encoder and belongs to optical-electricity encoder realizing methods. The method includes the steps that a square-wave digital signal is output based on the sine slit technology, and two approximately ideal differential analog signals are output at the same time; an increment signal A and an increment signal B participate in subdivision operation, analog and amplification of the two differential analog signals are achieved through two analog operation and amplification devices, analog signals are sent to a microprocessor to be subject to analog-digital conversion after being amplified, and high subdivision is carried out through the CORDIC algorithm; proprietary protocol frames are formed by data obtained after subdivision and electrode control signals U, V and W and output through the RS485 interface or the RS422 interface, wherein multiple protocols such as the Biss protocol, the SSI protocol, the RS485 protocol and the CAN protocol can be compatible at the same time. The electronic subdivision method achieved in this way improves the precision of the encoder and also improves the anti-interference performance and high speed performance of the encoder.

Disclosed are an adaptive power controllable WIFI adjusting method and device, wherein the method includes the following steps that are suitable for a WIFI mobile terminal to execute: determining a WIFI adjustment object as well as an adjustment target value by detecting a current WIFI application environment and/or communication status; obtaining a current value of the WIFI adjustment object by detecting the WIFI adjustment object; comparing the adjustment target value with the current value, and coupling back a comparison result; performing an initial adjustment and a fine adjustment on the WIFI adjustment object according to the coupled-back comparison result, and making a value of the adjustment object obtained after the adjustments consistent with the adjustment target value through precise adjustment, calibration, and correction.

The invention relates to a magnetic suspension flywheel battery H-indefinite control method based on state space analysis. A state space equation of a controlled object is substituted to an enclosed loop control system transfer function, and a control parameter of an H-indefinite controller is obtained with combination of a control system weighting function via solution. The controlled object is controlled by the H-indefinite controller according to the control parameter. The state space equation of the controlled object is confirmed on the basis of state space analysis, and the control parameter of the H-indefinite controller can be rapidly obtained. Therefore, robustness stability and anti-interference and anti-perturbation capability of a magnetic suspension flywheel battery system are effectively enhanced, high-speed and stable rotation of a magnetic suspension energy storage flywheel is facilitated, and specific power and specific energy of a magnetic suspension flywheel battery are enhanced.

The invention discloses a preparation method of high-purity boron trichloride-11, and belongs to the field of preparation methods of boron compounds. The preparation method comprises the steps such as pretreating raw materials, synthesizing boron trichloride-11 through reaction of aluminum chloride and boron trifluoride-11, filtering, preliminarily separating, rectifying and purifying, collecting the high-purity boron trichloride-11 product, treating tail gas, and the like. The high-purity boron trichloride-11 prepared by the preparation method disclosed by the invention is high in purity which can reach over 99.9999%, can satisfy requirements of manufacturing integrated circuit semiconductor apparatuses on a large scale, effectively improves interference resistance and radiation resistance of an integrated circuit, and can be used as the raw material for manufacturing raw materials such as a high-purity boron-11 isotope material, a special boron fiber material and light-guide fiber.

The invention discloses a positioning system based on a laser beam-to-ray detector array, and relates to the application field of the Internet of Things. The sensors and their arrays deployed in the environment include multiple laser beam detectors composed of transmitters and receivers. The transmitters and receivers of multiple laser beam detectors are placed opposite to each other at equal distances. Multiple laser beam detectors Detectors are laid out in horizontal and vertical directions to form a detector network; among the sensors and their arrays laid out in the environment, the receiving end of the laser beam detector is connected to the signal acquisition circuit, and the signal acquisition circuit is connected to the microcomputer through the SPI serial interface. The processor circuit is connected; the human-machine interface circuit includes a PC computer and an RS485 interface chip connected to each other, and the microprocessor circuit is connected to the PC computer through the RS485 interface chip. The system does not require the person or object to be positioned to hold some kind of positioning device, and is an active positioning technology. And the laser has high reliability and anti-interference characteristics.

The invention discloses an object identification method based on UWB communication signals. According to the object identification method based on the UWB communication signals, a wireless sensor network is formed by a plurality of communication nodes, wherein each node comprises multiple MIMO antennas to receive signals. Firstly, characteristic parameters of signals received by the multiple antennas are extracted, parameter fusion is carried out on the extracted characteristic parameters, and a classification model is obtained through a fusion parameter training classifier. The classification model enters an identification mode after training is completed, and an object is identified by using the classification model. Through the utilization of the multi-antenna technology, the accuracy of object identification is improved, the anti-jamming capability of a system is enhanced, and normal wireless node communication is not influenced.

The present invention relates to serial port communication field, in particular an embedded system serial credible communication control method. The technical styles include: setting a receiving buffer region FIFO in the embedded system memory continuation address, adopting serial port break working mode, divided into the foreground and the background, the background completing the serial port receiving function; the foreground analyzing the receiving buffer region after completing the serial port task. One bit physical address pair receiving task timer, if in communication, the timer is assigned with one nonzero value, once being zero, the receiving task is completed. The invention only needs less resource, effectively resolves the problem of task overtime caused by potential unfiniteness, uncontinuity and discontinuity in the serial port communication task, improves anti-interference, fault-tolerance and error correcting capability of serial port.

The invention relates to an underwater anti-interference transmission method based on prime digital interleaving and spinal cord coding, and belongs to the technical field of wireless communication coding and interleaving. The underwater anti-interference transmission method comprises: information bits to be transmitted being sequentially subjected to signal source interleaving and then verified;then, carrying out Spinal channel coding and channel interleaving; and finally, sending the signal to an underwater acoustic time-varying channel through OFDM modulation and up-conversion; the received signal processing module receiving the transmitted signals and sequentially performing demodulation and channel de-interleaving; and carrying out Spinal decoding and de-check, and finally, carryingout signal source de-interleaving to output recovered information bits. The method has the characteristics that the realization is flexible and the matrix dimension does not need to be considered deliberately. The bit error rate is effectively reduced. In addition, Spinal short code coding is adopted as channel coding, and compared with other channel coding, the complexity is relatively low. Underthe condition that the complexity is not increased or even reduced, the series connection error is greatly improved, and burst interference can be coped with.

The invention discloses sulphur-based gamma-biological compound fertilizer and a preparation method thereof. The sulphur-based gamma-biological compound fertilizer comprises gamma-poly(glutamic acid), wheat straw extract, microbial agents and secondary elements, namely, nitrogen elements, phosphorus elements and potassium elements. The gamma-poly(glutamic acid) and the microbial agents are prepared through the fermentation process. The wheat straw extract is obtained by extracting and processing young wheat straw seedlings. The secondary elements are obtained through related compound powder. The sulphur-based gamma-biological compound fertilizer comprises 0.1-5.0 parts of gamma-poly(glutamic acid), 3-12 parts of wheat straw extract, 2-6 parts of microbial agents, 20-30 parts of urea, 55-85 parts of monoammonium phosphate and 30-50 parts of potassium sulfate, wherein microelements include calcium, magnesium, sulphur, manganese, zinc, boron and molybdenum. By means of the sulphur-based gamma-biological compound fertilizer, the nitrogen nutrition utilization rate can be increased, and by means of the supplementary effect of synergistic interaction of the gamma-poly(glutamic acid) and the wheat straw extract, the soil microenvironment is improved, the nutrient absorption is promoted, the crop yield is increased, and the disease-resistant, stress-resistant, anti-interference and successive crop prevention capacity of plants is improved.