180results about How to "Low anti-interference" patented technology

A position-posture sensing system of movable robot is composed of a photoelectric sensor for detecting the change of position and posture and converting the change to digital signals, an elastic pressing unit for ensuring the proper distance between said photoelectric sensor and ground, and a controlling-processing circuit consisting of a single-chip microprocessor, a communication interface chip, and the firmed programs. Its method is also disclosed.

The invention relates to a robust fuzzy predictive fault-tolerant control method for an interval time-varying-delaying system. The robust fuzzy predictive fault-tolerant control method includes the following steps that firstly, a T-S fuzzy model of a nonlinear system is constructed; secondly, the constructed T-S fuzzy model is converted into an expanded T-S fuzzy model; thirdly, according to the constructed expanded T-S fuzzy model, a fault-tolerant controller that satisfies a control law is designed; and fourthly, a gain of the fault-tolerant controller is solved in a form of linear matrix inequality and the robust fuzzy predictive fault-tolerant control law is calculated. According to the robust fuzzy predictive fault-tolerant control method for the interval time-varying-delaying system,the robust fuzzy predictive fault-tolerant control method with time-delay dependence is provided according to the fact that a type of the industrial process has the characteristics such as nonlinearity, uncertainty, unknown disturbance, interval time-varying-delaying and partial actuator failure, thus the industrial process operates more smoothly and efficiently, the performance of a system is improved, and the fault tolerance of the system is increased.

The invention relates to a method for acquiring a wide-band frequency modulation stepped chaos radar signal, which comprises the following steps: acquiring an echo baseband signal rn(t) of each subpulse; then, correspondingly carrying out matched filtering or correlation processing on the baseband echo signal rn(t) of each subpulse and the respective baseband chaos sequence, thus obtaining a frequency domain signal Un(f) of each subpulse; carrying spectral migration on the frequency domain signal Un(f) of each subpulse, and then carrying out de-overlapping and phase compensation, wherein the frequency shift quantity of the spectral migration is equal to the frequency interval DELTAf of a local frequency source; and carrying out coherence stack on the subpulse signal subjected to de-overlapping and phase compensation, thus obtaining a synthesized large wide-band signal, wherein the band width of the synthesized wide-band signal is B+(N-1)DELTAf. The invention provides a new technical route for realizing a chaos radar signal having an ultra large band width. By combining the chaos signal and the frequency stepped signal, the advantages of the both are combined. The method provided by the invention is simple and clear, is easy to realize, is applicable to frequency linear/nonlinear stepping and has important practical meanings in an actual system.

The invention provides a correlation delay-differential chaos shift keying (CD-DCSK)-based modulation communication method with the advantages of high antijamming capacity, simple circuit structure and low cost. A chaos signal at a transmitting end is subjected to related delay transmission; in front and back two-half symbol periods, two useful signals are transmitted simultaneously; and at a receiving end, the useful signals are subjected to related delay operation of a correlator and are respectively demodulated into useful signals a and b, and the useful signals a and b are subjected to serial conversion to form the original transmitting signals. The method has the advantages of high security of correlation delay shift keying (CDSK), low error rate of differential chaos shift keying (DCSK) and the like; and signals transmitted in channels are more uniform, and have high security and low error rate, and the data transmission rate is 2 times that of the DCSK. Besides, on the implementation of hardware circuits, the CD-DCSK is simpler than QCSK (quadrature chaos shift keying). The method ensures high security, high data transmission rate, higher antijamming capacity and low cost, and is easy to promote.

The invention discloses a method for cascade-emitting communication channel codes and space-time codes in a multi-input multi-output frequency division multiplexing system. The method of the invention comprises: firstly, encoding information bits which are outputted by a information source in communication channel by an originating end and obtaining information bits and check bits, then, confirming whether the originating end needs carrying out second deletion or not according to the transmitting aerial number n and the average number of pilot frequencies which are needed by each sub-belt and confirming the order of a first deletion, the second deletion and interlace according to an interlace mode, modulating binary sequences which are obtained by the originating end and obtaining modulation symbols, transforming the modulation symbols from parallel to serial by the originating end, carrying out space-time encoding, and obtaining code words after encoding, and finally mapping the code words and the pilot frequency on different sub-carrier waves by the originating end and emitting through n strips of transmitting aerials. The MIMO+OFDM not only can obtain coding gains of the communication channel codes to the maximum but also can obtain diversity gains of the space-time codes through utilizing the invention.

The invention discloses a radar interference recognition signal processing system, and aims to provide a processing system which is simple and reliable in circuit and high in interference resistance. The radar interference recognition signal processing system is implemented according to the following technical scheme: in the signal processing circuit, a waveform generator sends generated modulation signals to a voltage-controlled oscillator, signals with the output frequency being fr are divided into two paths, one path of the signals are subjected to M times of frequency doubling amplification through a frequency doubling amplification circuit A and turned into signals with the frequency being M*fr, one part of the signals are transmitted through a transmitting antenna A, and another part of the signals are inputted into a down-conversion circuit A to act as local oscillation signals of the down-conversion circuit A; and the other path of the signals is subjected to frequency division of a frequency dividing circuit and turned into signals with the frequency being fr/L, one part of the signals are subjected to frequency doubling amplification of a frequency doubling amplification circuit B and turned into frequency doubling amplification signals which are transmitted through a transmitting antenna B, and another part of the signals are inputted into a down-conversion circuit B to act local oscillation signals of the down-conversion circuit B. Intermediate-frequency signals A and intermediate-frequency signals B are respectively subjected to interface recognition circuit down-conversion filtering, FFT (Fast Fourier Transform), non-coherence accumulation and threshold judgment, and interference recognition judgment signals are outputted.

The invention belongs to the technical field of electrical wire and cable production processes, and particularly relates to a cleaning-type oil-resistant cable. Conductors (1) are copper conductors, the structures of the conductors adopt a first type or a second type, a cross-linked polyethylene insulating layer (2) is extruded on the conductors (1) respectively by applying a warm water cross-linking technology to serve as a cable core, an inner lining layer (3) is arranged outside the cable core, an armor layer (4) is armored by back-twist type galvanized fine steel wires, aluminum-plastic composite tapes are longitudinally coated and welded outside the armor layer (4) to form a water and tide blocking layer (5), and a flame-retardant jacket layer (6) made of a butyronitrile material is arranged at the outermost layer. With a double-layer co-extrusion mode to extrude, the arrangement of the high-strength water and tide blocking layer capable of longitudinally preventing tension in the overall cable and a process of double-layer co-extrusion protection layers, the cleaning-type oil-resistant cable has not only very strong resistance to abrasion and oil, but also better resistance to cleaning, thereby the quality stability of the oil-resistant cable is improved and a new technical field is developed for the development of the cleaning-type oil-resistant cable.

The invention relates to a space-frequency joint anti-interference implementation method. According to the method, an FFT (fast fourier transformation) broadband segmentation method is adopted to segment a broadband signal into multiple narrow-band signals, a sliding window method is adopted to realize repeated FFT in short data, covariance matrix calculation among frequency point signals is realized, a linearly constrained minimum variance criterion is adopted to solve a filter weight of each narrow-band signal, and a mode of alternate splicing of two-way data is adopted to obtain one-way data. Space domain and frequency domain anti-interference methods are fused together to design a high-flexibility anti-interference implementation scheme, interference in various forms such as narrow band, broadband and sweep frequency can be inhibited at the same time, anti-interference capacity of the signals are improved substantially, signal distortion is reduced, and the space-frequency joint anti-interference implementation method is suitable for receiver terminals of various satellite navigation systems.

A temperature control system comprises a plurality of distributed heat sources and a plurality of temperature sensors. Each heat source is connected with a respective power drive module, all power drive modules are controlled by a temperature controller, and a temperature control system takes a target temperature as reference input and output temperatures of the temperature sensors as feedback; tracking errors between the reference input and the output temperatures are input in the temperature controller, and the temperature controller converts the tracking errors into average errors, obtains error deviations between the average control quantity and the tracking errors and the average errors through calculation according to the average errors, obtains the superposition control quantity of each heat source according to the average errors and takes sum signals of the average control quantity and the superposition control quantities as the final output of the temperature controller. The temperature control system has the advantages of being low in dependence on single channels, high in anti-interference capacity and capable of performing uniformity control on temperatures of temperature boxes with distributed heat sources.

The invention discloses an integrated data collector and a data consistency verification and test method thereof. The integrated data collector comprises a power supply module, a data collection module, a data processing module, a communication module and a storage module; the data collection module comprises an FPGA module, an AD module and a sensing element which are connected successively; theFPGA module is provided with MVB and/or WTB network data collecting interface(s); the communication module comprises an Ethernet/WIFI control interface connected with a peripheral PC and/or mobile terminal to realize control, configuration and data interaction of the collector; the storage module is connected with a U-disk/hard-disk interface in the data processing module; and the data processingmodule is connected with an Ethernet monitoring port for monitoring real-time Ethernet, collecting data of a train and parsing protocols. The collector can be used to collect different types of data,is small in size, portable, and capable of remote control, long-time data test and recording.

The invention discloses an optical detection system and device. The optical detection system comprises a laser, a non-polarizing beam splitter, a polarizing beam splitter, a transparent reflecting mirror and a measurement lens which are sequentially arranged from top to bottom. The non-polarizing beam splitter is horizontally arranged and corresponds to a photoelectric receiver A, a lambda/4 wave plate is fixed between the transparent reflecting mirror and the measurement lens, and the polarizing beam splitter is horizontally arranged and corresponds to a photoelectric receiver B. By means of the optical detection system and device, the problem that existing optical detection devices and existing non-contact microscopic measuring heads for surface topography measurement are poor in interference resisting capacity, limited in resolving power and the like is solved.

The invention belongs to the field of the wireless communication technology and particularly relates to a method and a device for restraining inter-cell interference of a high level modulating signal based on OFDM-IDMA (Orthogonal Frequency Division Multiplexing-Interleave-division Multiple Access). The invention adopts an OFDM signal sending and receiving system model based on IDMA; after being interwoven by an interweaver, a signal of a transmitter is modulated; and prior information of a received signal is updated by an ESE (Elementary Signal Estimator) estimator and a DEC (Direct Energy Conversion) decoder so as to reduce the interference. The device provided by the invention comprises a transmitter and a receiver for restraining inter-cell interference based on OFDM-IDMA. The method and the device provided by the invention can improve the anti-jamming capability of cell edge users in a heaver loading system.

The invention discloses a mobile robot positioning system. The mobile robot positioning system comprises a plurality of magnetic guiding rails which are arranged at a robot working place and are connected with one another in sequence; magnetic strips are arranged between a point to be monitored of the working place and every two adjacent magnetic guiding rails; the section between every two adjacent magnetic strips forms a working section of a robot operating along the magnetic guiding rails; the robot is provided with an industrial control computer; the front part and the rear part of a chassis of the robot are provided with a front row of magnetic sensors and a rear row of magnetic sensors which are used for detecting and outputting magnetic-field signals of the magnetic guiding rails and the magnetic strips when the robot travels on the magnetic guiding rails; the industrial control computer is used for receiving the magnetic-field signals outputted by the front row of magnetic sensors and the rear row of magnetic sensors and controlling the traveling state of the robot according to the magnetic-field signals and pre-stored information of operating paths of the robot so as to navigate and position the operation of the robot. The mobile robot positioning system disclosed by the invention has the advantages that when the navigation robot operates, the reliability is high and the positioning error is less.

The invention discloses an efficient isotope battery based on a gas radioactive source. The isotope battery comprises a battery base with an embedment groove, a radioactive light source support put in the embedment groove of the battery base, at least one radioactive source radiation light-emitting unit put on the radioactive light source support, a lens buckled on the embedment groove of the battery base and isolating the inside and the outside of the embedment groove, an output end support connected with the battery base, and a photovoltaic conversion unit put on the output end support, matched with the lens in position and used for outputting electric energy, wherein light rays emitted by all the radioactive source radiation light-emitting units are projected to the photovoltaic conversion unit after being gathered by the lens. A gas isotope radioactive source is ingeniously used for stimulating a radioactive light-emitting material to emit light, light rays are gathered on the photovoltaic conversion unit by the lens through the combination of an optics principle so that electric energy can be output, the light intensity on the photovoltaic conversion unit is greatly improved, the efficiency of the photovoltaic conversion unit is greatly improved, and the output power and the energy conversion efficiency of the isotope battery are improved.

The embodiment of the invention provides a positioning method, a terminal, LED (Light-Emitting Diode) control equipment and a system. The method comprises the following steps: receiving an optical signal transmitted by an LED light source, wherein the optical signal carries identification information relevant to a position at which the LED light source is positioned; resolving the optical signal, and determining the identification information; determining a geographic position relevant to the identification information according to preset geographic positions relevant to the identification information; and taking the determined geographic position as a positioning result. The positioning method provided by the embodiment of the invention is suitable for indoor positioning, has relatively high interference resistance, and is relatively low in power consumption.

The invention discloses a sensorless brushless DC motor starting method. The motor is formed by a stator and a permanent magnet rotor. The starting method comprises steps: pre-positioning is carried out; cyclic acceleration is carried out, voltage U for enabling the rotor to rotate acceleratively is applied to the stator, T2 time is continued, and position signals of the rotor are synchronously detected; when a position signal of a zero crossing point is detected during an operation process, commutation is carried out at once, and a closed-loop acceleration process is carried out; otherwise, voltage U is applied to the stator, T1 time is continued, position signals of the rotor are detected at the same time, when a position signal of a zero crossing point is detected, commutation is carried out at once, a closed-loop acceleration process is carried out, and if no position signal of the zero crossing point is detected, voltage U is increased, and the step is repeated; and closed-loop acceleration is carried out. According to the method provided by the invention, the problem of starting reliability of the sensorless brushless DC motor can be well solved, no starting curve needs to strictly designed, and the ability of adaptation to motor load fluctuation during the starting process can be improved.

The invention relates to a wideband frequency-modulation stepping noise radar signal processing method based on compressive sensing. The method comprises the following step of combining a noise signal, a frequency steeping signal and the compressive sensing, so that the method combines advantages of the noise signal, the frequency steeping signal and the compressive sensing, keeps the advantages of frequency stepping signal narrowband treatment, and also has the features of low intercept probability of the noise signal, interference resistance, and good electromagnetic compatibility; and meanwhile, the method also combines the compressive sensing to obtain a high-resolution image by utilizing a low data amount. According to the method disclosed by the invention, under the condition that an observation target is sparse, the requirements of (ultra) wideband signals on receiver A/D (Analogue to Digital) sampling, storage and transmission equipment are reduced and the method is easy to realize, so that the wideband frequency-modulation stepping noise radar signal processing method based on the compressive sensing has important real meaning to an actual system.

The invention discloses a method for radar waveform designing and optimization, wherein the method belongs to the field of radar communication technology. The invention aims to provide the method for waveform designing and optimization, wherein the waveform has characteristics of relatively good thumbtack ambiguity function, low interception probability, relatively high interference resistance, good orthogonality, relatively low peak value power ratio, controllable spectral shape, controllable signal sparsity, controllable signal reconfigurability, etc. According to the method, a related dictionary is optimized according to the requirement for spectrum controllability and low peak mean value power ration in radar waveform design. Furthermore a signal generating system is formed by a signal synthesizing part, an observation matrix part and a sparsity coefficient control part in a closed-loop manner. In signal synthesizing, an output signal is generated according to the dictionary and the sparsity coefficient; a compressed signal is obtained from an output signal through an observation matrix; and the sparsity coefficient required for signal synthesizing at next time is directly obtained from the compression signal through a sparsity coefficient control system. Then in a signal reconstruction system, a reconstructed signal is synthesized from the compressed signal according to the information of the dictionary through the sparisity coefficient control system. The method for radar waveform designing and optimization realizes relatively good application characteristic of the designed radar waveform.

The invention discloses a methane sensor based on a single heating element, a preparation method and application. The methane sensor is suitable for industrial and mining enterprises and comprises a heating element, a measuring element, and an environment temperature measuring element, wherein a heater of the heating element of the methane sensor and a measuring component of the measuring element are suspended in air through supporting arms; the heating element independently heats to the high-temperature working state; the measuring element is independently used for detecting gas concentration; the temperature on a detecting sheet of the environment temperature measuring element detects is used for temperature compensation. The processing technology of the methane sensor is compatible with the CMOS (Complementary Metal Oxide Semiconductor) technology. The sensor has the advantages that the sensor is simple in structure, low in power dissipation, high in sensitivity, good in anti-jamming performance, and low in cost.

The invention belongs to the field of gas extraction and relates to a gas extraction pipeline continuous and automatic drainage and deslagging device. The gas extraction pipeline continuous and automatic drainage and deslagging device is composed of a main device tank, a water tank, a gas extraction inlet, a gas negative-pressure extraction port, a condensing system, a pressure regulating system, a control system, a drainage and deslagging system, a water level monitoring system, a water and slag mixer, a pressure monitoring system, a separating plate guide groove and a separating plate, wherein the water tank is arranged inside the main device tank and separated into an upper tank body and a lower tank body by the separating plate; the condensing system can condense steam inside gas and collecting water into the water tank; the water level monitoring system and the pressure monitoring system are connected with a control system so that the control system can control opening and closing of the separating plate as well as pressure regulation of the pressure regulating system; water and slag can be uniformly mixed by the water and slag mixer and then drained via the drainage and deslagging system. The gas extraction pipeline continuous and automatic drainage and deslagging device is stable in system operation, high in interference resistance, convenient to arrange, full in automation and capable of saving manual operation and achieving continuous and efficiency operation.

The invention discloses a frequency converter output short circuit protection circuit and a protection method thereof. The protection circuit comprises a current detecting module, a current operational amplifier processing module, an anti-jamming processing module and a PWM (pulse width modulation) control lockout output module, wherein the current detecting module is used for detecting UVW three-phase current of a motor, the current operational amplifier processing module is used for amplifying the detected UVW three-phase current to obtain an amplifying signal, the anti-jamming processing module is used for comparing the amplifying signal with a reference signal to obtain an output short circuit signal, and the PWM control lockout output module is used for locking out a driving signal of the motor according to the short circuit signal. The frequency converter output short circuit protection circuit and the protection method effectively solve the technical problems of imperfect three-phase output short circuit protection, slow dynamic response and poor anti-jamming capability of a system.

The invention discloses a full-section water-blocking and sealed multi-signal composite cable, which includes a cable core, an inner sheath, a shielding layer and an outer sheath. layer, a shielding layer is braided between the outer sheath and the inner sheath, and a wrapping tape is also provided between the shielding layer and the outer sheath. The rope is helically twisted, and the twisted space of the cable core and the space of the shielding layer are filled with filling glue. The power line, coaxial line, twisted wire and outer sheath of the composite cable all contain a braided shielding layer, and are sheathed with chemical materials that are resistant to hydrolysis and wear, and the gaps between each unit are filled with water-blocking fillers. Rubber, with the ability to withstand high-pressure water seepage across the entire cross-section. In underwater applications, it can provide not only the optical fiber for optical signal transmission, but also the power line for control signal transmission, the coaxial line for radio frequency signals and the twisted pair wire for communication signals, and the product is small in size, diverse in function and stable in transmission.

The embodiment of the invention provides C-RAN network planning method and device. The method comprises the following steps: acquiring the overlapping coverage of each RRU in an RRU set and other RRUs; marking the other RRUs of which the overlapping coverage is higher than a preset coverage threshold as adjacent RRUs; selecting one RRU from the RRU set as a main RRU; if the distance between the main RRU and the adjacent RRUs in the RRU set and the distance between any two adjacent RRUs meet the preset distance threshold values, combining the main RRU and the adjacent RRUs into a sub-cluster; removing the RRU in the sub-cluster from the RRU set; selecting the next RRU from the rest RRUs in the RRU set as a main RRU until the rest RRUs in the RRU set are not adjacent RRUs of other RRUs; according to the embodiment of the invention, the adjacent relation of each RRU in the RRU set is obtained, and the RRU in the RRU set is divided into the plurality of sub-clusters by combining the distance between the RRU set and the RRU set, so that the planning of the BBU is facilitated, the anti-interference effect between the RRUs is further reduced, and the spectrum efficiency function is improved.

The invention relates to a control method of a lockup clutch state collecting circuit. When the radio frequency identification (RFID) electronic tag of the collecting circuit integrating the lockup clutch state or the RFID device of the collecting circuit adopting the lockup clutch state is in a RFID field, the control method comprises the step (a) and other steps, wherein the step (a) is that the RFID electronic tag or the RFID device enters the RFID field, the radio frequency analog front-end of the RFID electronic tag is electrified to work. The beneficial effects of the invention are as follows: the lockup clutch state collecting circuit of the invention has the advantages of low power consumption and interference resistance; and as the lockup clutch state collecting circuit can be integrated in the electronic tag, the collecting circuit is easier to combine with the electronic tag to be used as the monitoring node of the Internet of things for moving containers and proof boxes in the logistics industry, thus timely monitoring the lockup clutch state of containers and proof boxes and ensuring the safety of moving containers and proof boxes.