9061 results about "Interference resistance" patented technology

Apparatus and a method for enhancing the interference resistance of so-called RFID systems, wherein identification messages delivered from an identification device are longer than the time for which an anticipated interference or disturbance is calculated to continue, and wherein the messages contain redundancy, such as a checksum. The messages are delivered from the identification device repetitively, and are redundancy checked. In the event of any discrepancy in the redundancy check, such as when the checksum is checked against the data content of the message and is found in disagreement, successive messages are checked bit for bit against each other. Any deviations between otherwise previously rejected messages are assumed to be due to external interference and are thus successively substituted until the redundancy check gives an accepted result, such as through the medium of a checksum check according to the so-called CRC method.

A system is disclosed for generating and transmitting data signals to the surface of the earth while drilling a borehole, the system operating by generating pressure pulses in the drilling fluid filling the drill string. The system is designed to maximize signal strength while minimizing the probability of jamming by drilling fluid particulates. The system uses a rotary valve modulator consisting of a stator with flow orifices through which drilling fluid flows, and a rotor which rotates with respect to the stator thereby opening and restricting flow through the orifices and thereby generating pressure pulses. The flow orifices with the stator in a "closed" position are configured to reduce jamming, and to simultaneously minimize flow area in order to maximize signal strength. This is accomplished by imparting a shear to the fluid flow through the modulator, and minimizing the aspect ratio and maximizing the minimum principal dimension of the closed flow area. A preferred embodiment and three alternate embodiments of the modulator are disclosed.

A touch sensitive control system for controlling a device includes a touch sensitive interface and a controller configured to communicate with the touch sensitive interface. The control system detects user manipulation of the touch sensitive interface with a touch detection sequence executed by the controller. The touch detection sequence determines a moving average of baseline signal level readings of the touch sensitive interface over time. The touch detection sequence compares a current baseline signal level reading to the moving average of baseline signal level readings, thereby detecting an interference event associated with an unexpectedly high current baseline signal level reading which could otherwise lead to a false touch detection.

The invention relates to a nuclear magnetic resonance ground water detection system with reference coils and a detection method. All-waveform data of nuclear magnetic resonance signals in a transmitting / receiving coil and noise signals in the reference coils are synchronously acquired through a plurality of paths of A / D acquiring units; the distribution of optimal positions and quantity of the reference coils is realized through calculating the maximum correlation of the noise signals and the nuclear magnetic resonance signals, which are acquired by the reference coils; and under the condition of unknown signal and noise statistical properties, noise in the nuclear magnetic resonance signals obtained by the transmitting / receiving coil is maximally offset by adopting a variable step adaptive algorithm, the nuclear magnetic resonance signals are extracted under the interference of multi-field source complex strong noise, thus the problems of multiple interferences of nuclear magnetic resonance detection near villages and in neighboring regions of cities and difficulty of separating multiple kinds of interference noise data are effectively solved, the interference resistance of instruments is improved, and a reliable detection device and method are provided for searching underground water near villages and in neighboring regions of cities.

The invention discloses a smart home voice control system combined with a video channel and a control method thereof. The system comprises a gesture detection module, a human face detection module, a recognition system module, a command judgment module and a command display and confirmation module which are sequentially connected. The recognition system module comprises a lip language part and a voice part, wherein the lip language part comprises a human face tracking and positioning module, a lip language video input module and a lip language recognition module which are sequentially connected; and the voice part comprises a voice input module and a voice recognition module which are sequentially connected. By detecting control gestures and recognizing human faces and lip language information to supplement the recognized voice information, the accuracy of control commands is improved and the feasibility of using voices to control a smart home is increased. The smart home voice control system combined with the video channel has very strong interference resistance, can be widely used for various complex environment modes and is particularly suitable for the situation of high noise because of a great number of people in home environments.

An apparatus and a corresponding method for mapping payload data of mapping input data streams onto a mapping output data stream having a channel bandwidth for transmission in a multi-carrier broadcast system includes first and second frame forming mechanisms. The first frame forming mechanism is adapted to form first frames having a first frame structure and the second frame forming mechanism is adapted to form second frames having a second frame structure. Preferably, in a second frame structure the data blocks of a particular mapping input data stream are spread in time and frequency over various data symbols and various data segments of the second frames to provide high robustness against disturbances. The payload portion of the second frame is preferably segmented into various data segments enabling use of a narrow-band receiver, even if both the first and second frames cover the same total channel bandwidth.

A cellular mobile communication system has a problem that communication quality is lowered by increase of an attenuation amount of a desired signal and increase of an interfering signal amount at a position apart from a base station and high-speed data communication becomes difficult. To solve this problem, when a mobile station M is at a location D where the radio attenuation is small, the mobile station M uses an OFDM signal to transmit data x, y and z via a traffic channel all at once so that data communication is performed at the maximum communication speed. On the other hand, when the mobile station M moves from the location D to a location E which is far from any of the base stations A, B and C, the mobile station M divides, the data x, y and z into three and, by using a diffusion OFDM signal having a high interference resistance, increases the interference resistance, and transmits data, x, y and z almost simultaneously from the three base stations A, B and C, thereby realizing equivalence of high-speed data transmission.

The invention discloses a phased array digital multi-beam generator for electronic reconnaissance, for the high resolution direction measurement having strong and weak signals or coherent multi signals, and forming the multi-target signal into anti-interference digital multi-beam to form a multi-beam process: first, in a data acquisition pretreatment board, an AD samples intermediate frequency analogue real signals output by each array antenna receiver, a DPS and a FPGA chip are cooperated to complete quadrate sampling and amplitude phase error correction; the intermediate frequency analogue actual signals are converted into a baseband digital complex signal and the amplitude phase error between the multi channels is corrected; a LVDS channel transmits the baseband digital complex signal to a signal processing board, the DPS completes the high resolution direction measurement having strong and weak signals or coherent multi signals and calculates the weight value group formed by the adaptive beam; the weight value group is added into the wave beam in the signal processing board FPGA to form a network; completing forming anti-interference digital multi-beam of the multi-target signal; an up frequency converter converts the output of the anti-interference digital multi-beam into needed intermediate frequency analogue signal.

The invention discloses a patrol robot system for an overhead high-voltage transmission line. The patrol robot system comprises a robot, the overhead line and a ground base station. The overhead line is supported through a cross bar. The robot comprises a robot body, a battery, a walking device, a single-chip microcomputer, a monitor device and a mobile communication device. The ground base station comprises a ground communication device and a ground monitor device. The ground base station and the robot are connected in a satellite communication mode. A robot platform is arranged on one side of the overhead line. The walking device comprises a walking mechanism and an obstacle avoidance mechanism. The walking device is connected with the single-chip microcomputer. The monitor range of the patrol robot is wider, environmental interference resistance is higher, the better obstacle avoidance mechanism is provided, a rest area is provided for the patrol robot, the service life of the patrol robot is prolonged, an automatic charging device is provided, work loads of workers are reduced, and the work of patrolling high-voltage lines and ultra-high-voltage lines can be completed excellently.

The invention provides a method for controlling opening of an electronic expansion valve in a central air-conditioning unit, which comprises the following steps of: 1, changing the opening of the electronic expansion valve according to difference of T suction and T target; and 2, after the opening of the electronic expansion valve is changed, when a compressor in the central air-conditioning unitoperates to a first preset time, if T exhaust is not in a preset range of exhaust superheat degree, changing the T target and turning to the step 1, otherwise setting T target to be T0 target and returning to the step 1, wherein T suction refers to an actual suction superheat degree of the compressor in the central air-conditioning unit, T exhaust refers to an actual exhaust superheat degree of the compressor, T target refers to an actual target suction superheat degree of the compressor, and T0 target refers to an initial target suction superheat degree of the compressor. By the control method, interference resistance of the central air-conditioning unit is improved, and the reliability of the central air-conditioning unit is improved.

A wireless sensor network system using GMR magnetic sensitive technology to detect vehicle information of the invention consists of two GMR sensor detecting end machines and a wireless receiving end machine. The two GMR sensor detecting end machines are connected with the wireless receiving end machine. The detection method of the invention detects information such as vehicle speed, vehicle length, driving direction, vehicle flow, lane occupancy ratio, etc., according to change data of the surrounding ground magnetic field sensed by the GMR sensor when the vehicles pass. The wireless sensor network system is characterized in having high precision of detecting speed, adaptability to various roads, low cost, convenient maintenance and high anti-interference ability and causing small destroy to road surface, etc.

The present invention relates to a transmission system with interference avoidance capability, which includes a transmission apparatus and a receiving apparatus. The transmission method thereof receives first data by means of an interference-processing module of the transmission apparatus and adds a plurality of extension data to the first data to produce second data for replacing a plurality of data corresponding to an interfered band in the second data with zero data, and then producing transmission data. The transmission data is converted to a radio-frequency signal by a transmission-processing module and transmitted to the receiving apparatus. Thereby, signal interference can be prevented by avoiding spectrum overlap regions.

A method of forming a disturb-resistant non volatile memory device. The method includes providing a semiconductor substrate having a surface region and forming a first dielectric material overlying the surface region. A first wiring material overlies the first dielectric material, a doped polysilicon material overlies the first wiring material, and an amorphous silicon switching material overlies the said polysilicon material. The switching material is subjected to a first patterning and etching process to separating a first strip of switching material from a second strip of switching spatially oriented in a first direction. The first strip of switching material, the second strip of switching material, the contact material, and the first wiring material are subjected to a second patterning and etching process to form at least a first switching element from the first strip of switching material and at least a second switching element from the second strip of switching material, and a first wiring structure comprising at least the first wiring material and the contact material. The first wiring structure being is in a second direction at an angle to the first direction.

The invention discloses an indoor robot navigation device which is characterized by comprising a circuit board, wherein a motion control module, a navigation and location module, a map management and path planning module, an image acquisition and processing module, a safety module and a man-machine interaction management module. The invention also provides an indoor robot navigation technology. The technology is characterized by comprising the following steps of: (a) establishing a map and planning a motion path of the robot; (b) refining a area and setting a visual signpost; (c) acquiring and processing the visual signpost, and performing motion location and correction; (d) storing and querying area and signpost information. The device has the advantages of autonomous navigation, high interference resistance capacity, zero track movement and the like, and the problem that most of the conventional navigation modes are low in positioning precision is solved through visual positioning correction.

The invention provides an anti-interference system and an anti-interference method based on digital beam forming and space-time zeroing cascade. The method is to cascade the digital beam forming and space-time zeroing, thus, the interference resistance of the whole system can be improved. The anti-interference system comprises an antenna array, a radio frequency module and an anti-interference processing module which are connected in sequence, wherein the anti-interference processing module comprises a digital beam forming module and a space-time zeroing processing module; the digital beam forming module is used for weighting and synthesizing various antenna array element signals into a reference beam signal pointed to a satellite, and synchronously obtaining an orthogonal vector signal orthogonal to a steering vector; output of the digital beam forming module is cascaded to the space-time zeroing processing module; and the space-time zeroing processing module is used for carrying out self-adaptive zeroing interference resistance processing to an interference signal in the reference beam signal, removing the interference signal in the reference beam signal, and outputting an effective satellite signal.

The invention belongs to the technical field of two-dimensional code identification, and provides a rapid positioning and identifying method based on two-dimensional code decoding. The method comprises the following steps: performing median filter processing on an entire image; scanning the image, judging whether or not a two-dimensional code exists in the image, and if so, acquiring a two-dimensional code regional coordinate; intercepting a two-dimensional code image; performing adaptive binarization processing; performing connected area disposal on black pixel points; screening four boundaries; converting the coordinate system of the image into the coordinate system of the two-dimensional code; projecting the two-dimensional code under a new coordinate system to obtain the directivity, real boundary length and coordinate of the two-dimensional code and the barycentric coordinates of black-white blocks; judging the gray values of the black-white blocks to obtain a two-dimensional code information matrix; and acquiring decoding information. The method can adapt to various working conditions, and has the advantages of high contrast, high interference resistance and low investment cost. Automatic positioning and identifying functions can be finished by only one set of industrial camera and light source; high working efficiency is achieved; and the production requirement of an assembly line is met to the maximum extent.

The invention provides a road traffic sign automatic identification and management system based on deep learning, wherein the system is used for the field of environment perception technology of a smart vehicle. The system comprises a traffic sign acquisition module, a traffic sign identification module and a traffic sign management module. The traffic sign acquisition module acquires a video which comprises the traffic sign and performs matching on each image frame and latitude-and-longitude of equipment in acquiring the image. The traffic sign identification module performs functions of processing the input image, performing positioning detection on the traffic sign, acquiring a candidate area which comprises the traffic sign, and performing classification identification on the traffic sign. The traffic sign management module transmits traffic sign and latitude-and-longitude information to a traffic management department, thereby determining whether placement of the traffic sign is reasonable and performing corresponding adjustment. The road traffic sign automatic identification and management system has advantages of large number of kinds of identified traffic signs, high precision, high real-time performance, etc. The road traffic sign automatic identification and management system further has beneficial effects of reducing effect of factors such as illumination change to image identification, improving interference resistance, and obtaining high identification accuracy and low error identification rate.

The invention discloses a sensor-less control method for a permanent-magnet synchronous motor. The sensor-less control method includes converting three-phase current of the permanent-magnet synchronous motor into equivalent current i alpha and i beta in an alpha-beta coordinate system; constructing a frictional order sliding-mode observer according to the equivalent current i alpha and i beta and equivalent voltage u alpha and u beta in the alpha-beta coordinate system, outputting counter electromotive force observed value in the alpha-beta coordinate system so as to realize estimation of angular velocity of rotors and positions of the rotors of the motor according to the counter electromotive force observed value. The invention further relates to a sensor-less control device for the permanent-magnet synchronous motor. By the sensor-less control method and the sensor-less control device for the permanent-magnet synchronous motor, counter electromotive force of the motor and position and speed of the rotors can be estimated quickly and accurately on conditions of parameter perturbation and load disturbance of a permanent-magnet synchronous motor control system, and interference resistance capacity of the system can be improved effectively.

The invention provides a method for detecting gestures. The method includes steps of detecting a predefined motion mode to determine a region-of-interest to be detected; detecting in the region-of-interest according to a scheme of a multi-scale sliding window, extracting local mean features from skin color membership images based on window images at first, classifying the features through a pre-trained Ada-Boost classifier, further extracting feature points on the basis of a gray-scale image of the window images processed via the Ada-Boost classifier, and then classifying the point-pair features through a random forest classifier; and clustering different types of target gesture windows and outputting accurate positions and shapes of the gestures. The invention further provides a system for detecting the gestures. The method and the system for detecting the gestures are simple, rapid and stable in implementing, and have the advantages of real-time performance, interference resistance, high identification precision and the like.

The invention discloses a mobile terminal with a rotation camera. The mobile terminal with the rotation camera comprises a terminal main body and a rotation camera component which is arranged at the top of the terminal main body and can rotate relatively to the terminal main body, wherein a Hall sensor is arranged at one end of the terminal main body, close to the rotation camera component, the Hall sensor is electrically connected with a central processing unit, a first magnet and a second magnet are arranged on a position in the rotation camera component, corresponding to the Hall sensor, the first magnet and the second magnet are bar magnets, a polarity of the first magnet and a polarity of the second magnet, which are the same, are oppositely arranged, and the first magnet, the second magnet and the Hall sensor are located on the same straight line under the circumstance that the rotation camera component is not rotated. The invention further discloses a camera angle control method of the mobile terminal with the rotation camera. By adopting the technical scheme, the mobile terminal with the rotation camera has strong magnetic field intensity, can effectively improve detection precision, and enables rotation angle detection to have good interference resistance.

The invention discloses a dual-redundancy steering engine controller, which belongs to the technical field of aviation flight control. A central control unit is a DSP chip digital signal processor, and PWM signals output by a plurality of paths of output ports of the central control unit are isolated by a photoelectric isolation unit, and then are divided into two groups and are input into a first set of power drive unit and a second set of power drive unit which consist of power drive chips and H bridge circuits and have same circuits respectively; drive power supplies of the two sets of power drive units and the voltage output to a steering engine (M) are switched by a fault switching unit controlled by the digital signal processor; a steering engine signal conditioning unit consisting of a steering engine current conditioning unit and a steering engine position conditioning unit is connected between the steering engine and an input end of the digital signal processor; and an RS422 serial port communication interface circuit unit is arranged between the digital signal processor and a host computer. The dual-redundancy steering engine controller has the advantages of simple structure, high control accuracy, good system stability, strong interference resistance, high reliability, low development cost and the like.

The invention relates to a shift register and a grid line drive device thereof. The shift register comprises a first thin film transistor, a second thin film transistor, a third thin film transistor, a fourth thin film transistor, a first capacitor, a discharge module and a compensation module. A gird of the first thin film transistor is connected with a first node, a source electrode of the first thin film transistor is connected with a clock signal end, and a drain electrode of the first thin film transistor is connected with a same-level output end; a grid of the second thin film transistor is connected with a second node, a source electrode of the second thin film transistor is connected with the same-level output end, and a drain electrode of the second thin film transistor is connected with a low level signal end; a grid of the third thin film transistor is connected with the first node, a source electrode of the third thin film transistor is connected with the low level signal end, and a drain electrode of the third thin film transistor is connected with the second node; a grid of the fourth thin film transistor is connected with the second node, a source electrode of the fourth thin film transistor is connected with the low level signal end, and a drain electrode of the fourth thin film transistor is connected with the first node; the first capacitor is connected between the clock signal end and the second node; the discharge module is connected between the clock signal end and the same-level output end; and the compensation module is connected between the first node and the low level signal end. The invention has the advantages of low cost, low power consumption, long service life, high stability, strong interference resistance, small delay, and the like.

The invention discloses a network netting and a routing method of a Bluetooth wireless sensor, which combines sensor network technique and Bluetooth technique and makes full use of the matured physical layer, MAC technique and anti-interference capacity of Bluetooth network when the sensor nets network, so as to lead the system to conveniently and rapidly net the network. A designed Bluetooth scatter net takes the practical use of a wireless sensor network into consideration when netting and uses a tree topology. The netting consists of three stages: the selection of a root node, the forming of a root piconet and the expansion of the network. By adopting the netting method based on that the energy can be predetermined and the service time of the network can be prolonged, and under the requirement of emphasizing the longest service life of the network, each piconet of the formed wireless sensor network is left with vacant positions and backup nodes, so as to lead the formed network to have better reliability, flexibility and self-recoverability to satisfy the situations that partial nodes can be added on, moved and leaves the network, etc. The routing information is interacted when the system is net, and when the network netting is completed, the routing information tables of all the nodes are built simultaneously. When the network is operated, a low-power respiratory mode of the Bluetooth network and the transmitting and sensing information of the network periodicity are used for prolonging the life service of the whole network.

The invention discloses a gateway based on a LoRa wireless technology, and belongs to the technical field of wireless communication equipment. The gateway is in a communication connection with at least one data acquiring node of an Internet of things perceptive level, and used for transmitting relevant data acquired by each data acquiring node to relevant equipment on a network layer of Internet of things. The gateway comprises a LoRa communication module, a remote communication module, a main control module and a power module, wherein the LoRa communication module is connected with each data acquiring node; the remote communication module is connected with the LoRa communication module; the LoRa communication module is connected with the remote communication module through the main control module, and used for controlling the LoRa communication module and the remote communication module; and the power module is connected with the LoRa communication module, the remote communication module and the main control module. The gateway has the beneficial effect that a LoRa wireless communication technology is adopted, and a license-free frequency band is utilized, so that free and wireless communication is realized. The gateway also has the advantages of simple installing process, no need of advanced wiring, high mobility, low communication cost, long communication distance, low power consumption and high interference resistance.

The invention discloses a tip clearance measurement method based on all-fiber tip timing. The method comprises the following steps: converting measurement on length measurement in a triangle method into measurement on a tip timing signal; adopting two fiber bundle type timing sensors, and enabling emission fibers in the timing sensors to emit two beams of auto-collimation emergent light with different wavelengths; enabling receiving fibers in the timing sensors to receive moment signals when leaves approach and leave a measurement region; monitoring the rotating speed of a rotor in real time by a rotating speed synchronization sensor; performing high-speed signal acquisition and circuit module processing on all the sensor signals, and reversely calculating a distance between the end face of each sensor and each leaf tip by an upper computer through a math model. According to the tip clearance measurement method, a clearance value is ingeniously converted into a tip timing signal relevant to the clearance value, so that a measurement system is irrelative to most environmental factors such as the leaf and electromagnetic interference, and the interference resistance and the clearance measurement precision of the system are improved.

The present invention provides a cross-layer design framework for the multiple access and routing problems in interference-limited wireless ad-hoc networks. It identified interference as an essential factor that couples multiple access and routing decisions through the trade-off between MAC throughput and path length. It formulates an optimization problem that maximizes the multiple access throughputs subject to constraints on the path length, single-to-interference-and-noise-ratio, and transmission power. It incorporates interference into the routing metric and reduces problem complexity via the set-based routing concept that solves the problem for a set of spatially close source nodes. Accordingly, the present invention introduces a joint routing, scheduling and power control algorithm that handles intra-set interference. In addition, it adopted a simple set coordination scheme for handling inter-set interference.

The invention relates to a resonance miniature electric field sensor. The sensor comprises a substrate, an exciting electrode with a comb structure, a vibration sensitive electrode with a comb structure, a shielding electrode, an electric field inductive electrode, a crossbeam and a supporting beam, wherein the exciting electrode with the comb structure is fixed on one side of the substrate by ananchor point, while the vibration sensitive electrode with the comb structure is fixed on the other side of the substrate by an anchor point; the shielding electrode and the electric field inductive electrode are fixed on the area of the substrate in the middle of the exciting electrode and the vibration sensitive electrode; the shielding electrode and the electric field inductive electrode are alternately arranged; the crossbeam is positioned in the middle of the shielding electrode; one end of the supporting beam is fixed on the substrate by the anchor point, while the other end is connectedwith the exciting electrode and the vibration sensitive electrode. The resonance miniature electric field sensor can reduce the static exciting voltage of a device, improve the sensitivity and precision of the sensor, and further improve the environment interference resistance capability of the sensor.

The invention relates to an optical three-dimensional measuring method based on a phase coding technology, belonging to the technical field of three-dimensional measurement. The method comprises the following steps of: (1) producing a grating coding stripe image by a computer; (2) projecting the grating coding stripe image by using digital projection equipment; and (3) acquiring the grating coding stripe image and performing coding solution and three-dimensional measurement by adopting a phase-shift algorithm. The method is characterized in that: the number of pixels in each grating period of the grating coding stripe image equals to the step number of the adopted phase-shift algorithm; the gray scale of the pixels in each grating period of the grating coding stripe image meets sine or cosine curve distribution, and the gray-scale value of the pixels are extreme points of the corresponding sine or cosine function. Compared with the traditional sine phase-shift coding method, the method has strong interference resistance to the nonlinear influence of gamma rays of the digital projection equipment, the coding has higher stability, reliability and correctness, and the method is important in the aspect of accurate measurement of an optical three-dimensional outline on the external surface of an object.