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36results about How to "Accurate signal reception" patented technology

Broadcast service signal transmission method and transmission device

When a transmission device transmits a broadcast service signal using a radio signal, the transmission device determines whether there is a moving body that is moving at high speed toward or away from the transmission device, and calculates the amount of Doppler shift of a radio frequency due to high speed movement based on the movement speed of the moving body when there is such a high-speed moving body. Moreover, the transmission device shifts the frequency of the radio signal for transmitting the broadcast service signal by the Doppler shift amount in the opposite direction of Doppler shift direction. By doing so, it is possible for a moving terminal to receive the broadcast service signal from the original radio frequency regardless of Doppler shifting.
Owner:FUJITSU LTD

Sampler offset calibration during operation

Methods and systems are described for sampling a data signal using a data sampler operating in a data signal processing path having a decision threshold associated with a decision feedback equalization (DFE) correction factor, measuring an eye opening of the data signal by adjusting a decision threshold of a spare sampler operating outside of the data signal processing path to determine a center-of-eye value for the decision threshold of the spare sampler, initializing the decision threshold of the spare sampler based on the center-of-eye value and the DFE correction factor, generating respective sets of phase-error signals for the spare sampler and the data sampler responsive to a detection of a predetermined data pattern, and updating the decision threshold of the data sampler based on an accumulation of differences in phase-error signals of the respective sets of phase-error signals.
Owner:KANDOU LABS

ADS-B airborne anti-interference receiving and processing method

The present invention provides an ADS-B airborne anti-interference receiving and processing method. The method comprises the following steps: judging whether a signal has a superposition situation or not after ADS-B airborne equipment receives the signal; if not, sequentially implementing dynamic threshold setting and shaping preprocessing on the signal to obtain a processed signal; implementing preamble pulse detection on the signal, calculating a reference power level of the signal after the detection is qualified, and then verifying the signal according to the reference power level; and then implementing data bit extraction and confidence calculation processing on the signal after verification, and outputting data bit contents and data location confidence of the signal. According to the ADS-B airborne anti-interference receiving and processing method provided by the invention, full and comprehensive verification processing solutions can be provided for various existing situations of space signals; interference, superposition and other problems of the space signals can be effectively solved; and the accuracy of the received signals can be ensured.
Owner:中电科西北集团有限公司

Low earth orbit satellite communication dynamic time delay and Doppler simulation method

The invention discloses a low earth orbit satellite communication dynamic time delay and Doppler simulation method, which calculates dynamic transmission time delay and dynamic Doppler frequency offset according to a real-time communication distance between a low earth orbit satellite and a ground terminal, and designs a corresponding dynamic time delay simulation system according to a low earth orbit satellite signal transmission model. A sending signal of a satellite end can be simulated to obtain a ground receiving signal in a real-time dynamic time delay scene after passing through the dynamic time delay simulation system. According to the dynamic time delay simulation system, the dynamic time delay filter does not need to calculate the filter coefficient in real time, the filter coefficient can be updated only by inputting the real-time time delay through the Farrow structure, and compared with other schemes, the dynamic time delay simulation system is simple in structure, low inimplementation complexity and accurate in simulation result. Meanwhile, up-sampling and down-sampling processing is adopted to enable a satellite sending signal frequency band to be in a working frequency band with good amplitude-frequency response of a time delay filter, and errors of a time delay simulation system are further reduced.
Owner:SOUTHEAST UNIV

Ventilating method and device for building

The invention relates to a ventilating method and a ventilating device for a building and is characterized in that a wind speed monitoring mechanism is arranged at the highest roof of a building and a position above the highest roof, the wind speed monitoring mechanism is electrically connected with an electric window and an automatic control system of the building, and the automatic control system of the building is used for controlling the wind speed monitoring mechanism and the electric window, so as to realize linkage of the wind speed monitoring mechanism and the electric window; by monitoring the change conditions of natural wind and adapting to the change of the natural wind, the resistance distribution of a resistance part on a ventilating path of the building can be changed; and a control signal produced by the control system is output to a control end of the electric outer window to form a regulation structure for leading the natural wind into the room of the building, so as to change the resistance distribution of the resistance part on the ventilating path of the building. The method and the device have the benefits of being convenient to control, simple in structure and capable of ensuring reasonable indoor natural ventilation.
Owner:GUANGZHOU DESIGN INST

Synchronous control apparatus for initial synchronization when receiving a wireless signal

A synchronous control apparatus for reception control in wireless packet communication suppresses detection errors during controlling synchronization to detect codes for improved signal reception. An initial synchronizer includes a code correlator for receiving delayed waves on plural paths. The code correlator outputs a correlation level value through another correlator. The correlation level value is compared with a threshold value from a threshold value register, with the result inputted into an address counter. The correlation level value is also inputted into a correlation level hold circuit. The hold circuit sums the correlation level values obtained in the correlator for a portion of the paths corresponding to a count in the address counter. The hold circuit compares the summed correlation level values with another threshold value from another threshold value register, and uses the result as a basis to set a top timing for receiving delayed waves.
Owner:LAPIS SEMICON CO LTD

Method and device for eliminating co-channel interference in quadrature amplitude modulation signals

The invention discloses a method and a device for eliminating co-channel interference in quadrature amplitude modulation signals. The method for eliminating the co-channel interference in the quadrature amplitude modulation (QAM) signals comprises the following steps of: performing fast Fourier transform on time domain received signals to acquire frequency domain received signals corresponding to the time domain received signals; calculating the power spectrum density of each signal component in the frequency domain received signals, and eliminating the co-channel interference in the frequency domain received signals according to the comparison relationship between the power spectrum density of each signal component in the frequency domain received signals and a power spectrum density threshold value; and performing inverse fast Fourier transform on the co-channel interference eliminated frequency domain received signals to acquire co-channel interference eliminated time domain received signals.
Owner:FUJITSU LTD

Underwater crossing pipeline detection integrated system and method

The invention relates to an underwater crossing pipeline detection integrated system, comprising a side scan sonar, a depth finder, a GPS base station, a calculation module, a pipeline electromagnetictransmitter, a pipeline electromagnetic receiver and a test pile, wherein the side scan sonar detects the water depth of a river directly above a pipeline, the pipeline electromagnetic transmitter transmits an electromagnetic signal, the pipeline electromagnetic receiver receives the electromagnetic signal and detects the distance from the center line of the pipeline to the river surface; and theinvention further discloses the detection method thereof. The underwater crossing pipeline detection integrated system provided by the invention has the beneficial effects of realizing the automationof data acquisition in a detection process and accurately positioning the location of the pipeline; based on an electromagnetic signal pipeline burial depth calculation model, the accurate calculation of the large burial depth of the underwater crossing pipeline is realized; the electromagnetic receiver accepts the signal accurately; and the precise positioning of the underwater crossing pipelineand a directional drilling crossing pipeline, the accurate calculation of the thickness of an overburden layer, and the detection and positioning of the damage to an anti-corrosion layer of the pipeline anti-corrosion layer are achieved, a reliable basis is provided for pipeline management, and accidents in the pipeline are avoided.
Owner:宁波市慧通管道科技有限公司

Light emitting device and display device having the same

A light emitting device and a display device using the light emitting device as a light source and including a panel assembly. The panel assembly has a gate lines for transferring gate signals, data lines for transferring data signals, and pixels at crossing regions of the gate lines and the data lines. The light emitting device provides a light source to the panel assembly. The light emitting device has a plurality of light emission pixels, and each light emission pixel corresponds to at least one of the pixels of the panel assembly. The display device has a brightness controller coupled to both the light emitting device and the panel assembly. The brightness controller generates and serializes light emission information signals for determining light emission levels of the light emission pixels and transmits the light emission information signals by differential signaling to the light emitting device.
Owner:SAMSUNG SDI CO LTD

Radar system using dipole antenna

The invention discloses a radar system using a dipole antenna. The radar system comprises a radar main antenna, a first radio frequency network, a first T / R assembly, a first frequency mixing module, a first receiver, an antenna control module, an auxiliary antenna, a second radio frequency network, a second T / R assembly, a second frequency mixing module, a second receiver, a drive module, a rotating table and an axis-angle encoder. The radar main antenna and the auxiliary antenna are located on the rotating table. The radar main antenna, the first radio frequency network, the first T / R assembly, the first frequency mixing module, the first receiver and the antenna control module are sequentially connected. The auxiliary antenna, the second radio frequency network, the second T / R assembly, the second frequency mixing module, the second receiver and the antenna control module are sequentially connected. According to the radar system, due to the design of combining the main antenna and the auxiliary antenna, signals of the radar system can be received more accurately, the problem of receiving faults caused by errors is reduced, the rotating table is controlled through encoding, the rotating angle of the rotating table is accurate, and the more accurate signal receiving function can be provided.
Owner:WUXI WISEN INNOVATION TECH

Radar system with high-array antenna as auxiliary antenna

The invention discloses a radar system with a high-array antenna as an auxiliary antenna. The radar system comprises a radar main antenna, a first radio frequency network, a first T / R assembly, a first mixing module, a first receiver, an antenna control module, the auxiliary antenna, a second radio frequency network, a second T / R assembly, a second mixing module, a second receiver, a driving module, a rotary table and a shaft angle encoder. The radar main antenna and the auxiliary antenna are located on the rotary table; the radar main antenna, the first radio frequency network, the first T / R assembly, the first mixing module, the first receiver and the antenna control module are sequentially connected; the auxiliary antenna, the second radio frequency network, the second T / R assembly, the second mixing module, the second receiver and the antenna control module are sequentially connected. According to the radar system, the main antenna and the auxiliary antenna are designed, so that signals of the radar system are received more accurately, and receiving faults caused by errors are reduced; meanwhile, coding control is carried out over the rotary table, the rotation angle of the rotary table is made accurate, and the more accurate signal receiving function is provided.
Owner:WUXI WISEN INNOVATION TECH

Receiving device used in high-definition television

In a receiving device of the invention used in high-definition television, a frequency information storage section stores error information of a frequency error of a signal output from an oscillator. A control unit controls the oscillator based on the error information stored in the frequency information storage section. In a simple configuration, it is, therefore, possible to shift, the frequency in a direction of tuning by a tuner, to thereby output the signal with an appropriate frequency from the oscillator without being influenced by an accuracy of the oscillator, thus to demodulate the received signal accurately. Accordingly, it can be avoided such a problem that no pilot signal is present in an IF signal within a predetermined band width filtered by a SAW filter or that the pilot signal, even if present, cannot be received.
Owner:FUNAI ELECTRIC CO LTD

Communication system

A communication system in which a reception signal can be accurately obtained from a signal transmitted over two-wire type transmission lines without any significant reduction in the communication speed. The communication system utilizing two-wire type transmission lines for transmitting transmission signals in opposite phases has a plurality of nodes connected to the two-wire type transmission lines, and each of the nodes incorporates terminating resistors acting upon the two-wire type transmission lines. A node which includes a reception circuit for receiving a transmission signal has an AC coupling circuit for extracting AC components in a transmission signal input through the transmission lines, a bias circuit for applying a bias voltage to a signal output from the AC coupling circuit and a clip circuit for clipping the level of a signal output from the bias circuit, which are provided at each of the two-wire type transmission lines.
Owner:HONDA MOTOR CO LTD

Radar system using main antenna as helical antenna

The invention discloses a radar system using a main antenna as a helical antenna. The radar system comprises a radar main antenna, a first RF network, a first T / R assembly, a first mixing module, a first receiving machine, an antenna control module, a secondary antenna, a second RF network, a second T / R assembly, a second mixing module, a second receiving machine, a driving module, a rotary table and a shaft angle encoder; the radar main antenna and the secondary antenna are both positioned on the rotary table; the radar main antenna, the first RF network, the first T / R assembly, the first mixing module, the first receiving machine and the antenna control module are connected in a sequence; the secondary antenna, the second RF network, the second T / R assembly, the second mixing module, the second receiving machine and the antenna control module are sequentially connected in a sequence. According to the radar system, the design of the main antenna and the secondary antenna enables accurate signal receiving of the radar system, and therefore, the problems like inaccurate receiving caused by error can be reduced; meanwhile, the rotary table is controlled through a code, so that the rotating angle of the rotary table is accurate, and as a result, the accurate signal receiving function can be realized.
Owner:WUXI WISEN INNOVATION TECH

Cloud-based cerebral infarction rehabilitation training device

The invention discloses a cloud-based cerebral infarction rehabilitation training device, which primarily comprises a supporting rack, a leg training device, a hand training device, a brain wave collecting device, a control device and a power supply device. The brain wave collecting device is used for receiving brain waves of a patient during training, and is then connected to an intelligent cloudplatform through the control device, and access terminals are arranged on a hospital computer. The device stores the collected brain wave signals of the patient in rehabilitation training through theintelligent cloud platform, and the access terminals are arranged on the hospital computer, medical worker terminals and family member terminals to achieve information interaction of rehabilitation training condition by the family members of the patient and medical workers, so that the rehabilitation training of the post-discharge cerebral infarction patient can be more effective, and the devicehas an extremely good treatment effect for long-term treatment.
Owner:杨彬

Fall detection positioning method and device based on attitude angle

The invention discloses a fall detection positioning method and device based on an attitude angle. The device comprises wearing bands which are respectively nested on a wrist and an ankle, attitude angle acquisition modules are fixed over the wearing belts; the number of the attitude angle acquisition modules is four. The attitude angle acquisition modules and a master control acquisition module are in wireless signal transmission; the master control acquisition module and a wireless signal receiving module carry out remote wireless signal transmission. The wireless signal receiving module iselectrically connected with a mobile phone receiving terminal; the master control acquisition module is composed of a two-half plastic shell. A clamping groove is formed in the rear portion of the plastic shell. The clamping groove is embedded in a belt, the falling track of the human body is accurately reproduced, misjudgment is avoided, multi-stage judgment is adopted, it is further guaranteed that misjudgment is avoided, a buzzer and an alarm lamp are controlled to be started in time when the human body falls down, passersby can help the falling human in time conveniently, family members ofthe falling one are remotely informed of the falling address, and the life safety is confirmed.
Owner:JILIN AGRICULTURAL UNIV

Three-dimensional stress sensor based on circularly polarized liquid metal antenna

The invention discloses a three-dimensional stress sensor based on a circularly polarized liquid metal antenna. The sensor comprises a box body, a shell and a circularly polarized antenna structure body; six surfaces of the box body are symmetrically provided with orifices, the inner side of the surface where each orifice is located is fixedly provided with the shell, the circularly polarized antenna structure body is installed in an inner cavity of the shell, the upper top surface of the circularly polarized antenna structure body clings to an upper cover, the upper cover slidably covers theupper opening of the shell, and the upper cover extends out of the box body; the circularly polarized antenna structure body is a compressible organic polymer body, an annular micro-channel is formedin the organic polymer body, the annular micro-channel is filled with liquid metal serving as an antenna, two ports of the liquid metal antenna are correspondingly connected with two feeder lines, andthe feeder lines are led out from the side wall of the organic polymer body. The invention can remotely monitor the three-dimensional stress change in the rock-soil body in real time, and has the advantages of accurate signal receiving, high stability, small size and the like.
Owner:CHONGQING UNIV

Circuit applied to display apparatus and associated signal processing method

A circuit applied to a display apparatus includes a front-end circuit, a conversion circuit and an impulsive interference detection circuit. The front-end circuit converts an analog input signal into a digital input signal. The conversion circuit, coupled to the front-end circuit, converts the digital input signal from a time domain to a frequency domain to generate a frequency-domain signal. The impulsive interference detection circuit, coupled to the conversion circuit, detects a noise intensity of the frequency-domain signal to generate a detection result, which is used to determine whether the analog input signal has impulsive interference.
Owner:XUESHAN TECH INC

A Dynamic Delay and Doppler Simulation Method for LEO Satellite Communication

The invention discloses a low-orbit satellite communication dynamic time delay and Doppler simulation method, which calculates the dynamic transmission time delay and dynamic Doppler frequency deviation according to the real-time communication distance between the low-orbit satellite and the ground terminal, and calculates the dynamic time-delay and dynamic Doppler frequency deviation according to the low-orbit satellite The signal transmission model designs the corresponding dynamic delay simulation system. After the sending signal of the satellite terminal passes through the dynamic time delay simulation system, the ground receiving signal under the real-time dynamic time delay scene can be simulated. In the dynamic delay simulation system of the present invention, the dynamic delay filter does not need to calculate the filter coefficients in real time, and the filter coefficients can be updated only by inputting the real time delay using the Farrow structure. Compared with other schemes, the structure is simple and the implementation complexity is low. And the simulation results are accurate. At the same time, the use of up-sampling and down-sampling processing makes the frequency band of the satellite transmission signal in the working frequency band of the time-delay filter with good amplitude-frequency response, further reducing the error of the time-delay simulation system.
Owner:SOUTHEAST UNIV

Intelligent travel terminal based on 3G wireless network

An intelligent travel terminal based on a 3G wireless network is a travel terminal device applied to tourist attractions and old sites and former residences and is mainly composed of a CPU, a FLASH memory, a power supply module, a GPS module, a 3G module, a USB module, a keyboard coding and decoding module, an audio decoding module, a D / A converting module, an audio amplifier, a video decoding module, a frame buffering memory, a video processing unit and a video coding module which are all arranged in a shell. A touch display screen, connecting ports, a receiving antenna and a keyboard are arranged outside the shell. Networking of the terminal is conducted through the most advanced 3G wireless network, tourist attractions, hotels and restaurants, flights and train numbers and the like canbe conveniently inquired about, positioning is conducted through a GPS satellite, the close contact between managers and tourists is kept, and accidents are avoided.
Owner:CHENGDU YOULIDE NEW ENERGY CO LTD

Rader system with reverse-arch-shaped antenna as main antenna

The invention discloses a radar system with a reverse-arch-shaped antenna as a main antenna. The radar system comprises the main radar antenna, a first radio frequency network, a first T / R module, a first frequency mixing module, a first receiver, an antenna control module, an auxiliary antenna, a secondary radio frequency network, a second T / R module, a second frequency mixing module, a second receiver, a driving module, a rotary table and an axis angle encoder. The main radar antenna and the auxiliary antenna are located on the rotary table, and the main radar antenna, the first radio frequency network, the first T / R module, the first frequency mixing module, the first receiver and the antenna control module are sequentially connected. The auxiliary antenna, the second radio frequency network, the second T / R module, the second frequency mixing module, the second receiver and the antenna control module are sequentially connected. According to the radar system, due to the design of the main antenna and the auxiliary antenna, signal receiving of the radar system can be more accurate, the problems of receiving errors and the like caused by errors are reduced, the rotary table is controlled in an encoding mode, the rotating angle of the rotary table is accurate, and the function of more accurate signal receiving is provided.
Owner:WUXI WISEN INNOVATION TECH

A fall detection and positioning method and device based on attitude angle

The invention discloses a fall detection and positioning method and device based on attitude angle, which includes wearing belts respectively nested on wrists and ankles, an attitude angle acquisition module is fixed above the wearing belt, and the attitude angle acquisition module There are four, the attitude angle acquisition module and the master control acquisition module are transmitted through wireless signals, the master control acquisition module and the wireless signal receiving module perform remote wireless signal transmission, and the wireless signal receiving module and the mobile phone receiving terminal pass through the electric Sexual connection, the master control acquisition module is composed of two halves of the plastic shell, the rear of the plastic shell is provided with a card slot, and the card slot is nested on the belt to accurately reproduce the trajectory of the human body falling, ensuring that there will be no In case of misjudgment, multi-level judgment is adopted to further ensure that there will be no misjudgment, and the buzzer and alarm light will be activated in time to facilitate passers-by to rescue in time.
Owner:JILIN AGRICULTURAL UNIV

Shock absorption connector for shock detection device in well

InactiveCN102128024BTo achieve directed connectionPrevent mutual rotationSurveyEngineeringFlange
The invention discloses a shock absorption connector for a shock detection device in a well and relates to a shock detection device in a well. Connecting bodies are a left connecting body and a right connecting body with the same structure; a left connecting claw is uniformly distributed at one end of the left connecting body; a left connecting lug is arranged at the tail end of the left connecting claw; a right connecting claw is uniformly distributed at one end of the right connecting body; a right connecting lug is arranged at the tail end of the right connecting claw; the left connecting claw and the right left connecting claw on the left connecting body and the right connecting body are inserted in a staggered mode; two semicircular-ring left flange plates and two semicircular-ring right flange plates are arranged between the left connecting lug and the right connecting lug; fixed rods are arranged between the left flanges and the right flanges; shock absorption pads are arrangedon the fixed rods; a left connecting notch and a left connecting hole are formed at the other end of the left connecting body; and a right connecting notch and a right connecting hole are formed at the other end of the right connecting body. Multi-level shock detection devices in the well do not interfere one another and can independently work, the acquired signals can be equivalently contrasted and superposed, the signals are accurately received, the signals are analyzed accurately, and the connector is applied to connecting the multi-level shock detection devices in the well.
Owner:中国石化集团胜利石油管理局地球物理勘探开发公司 +1

Radar receiving system with diode mixer circuit

The invention discloses a radar receiving system with a diode mixer circuit. The radar receiving system comprises a radar main antenna, a first radio frequency network, a first T / R component, a first mixing module, a first receiver, an antenna control module, an auxiliary antenna, a second radio frequency network, a second T / R component, a second mixing module, a second receiver, a driver module, a turret and a shaft angle encoder. Both the radar main antenna and the auxiliary antenna are located on the turret; the radar main antenna, the first radio frequency network, the first T / R component, the first mixing module, the first receiver and the antenna control module are connected in sequence; the auxiliary antenna, the second radio frequency network, the second T / R component, the second mixing module, the second receiver and the antenna control module are connected in sequence. The main antenna and the auxiliary antenna are designed, so that signal reception of the radar system is more accurate, and reception faults caused by errors are reduced; meanwhile, the turret is controlled in an encoding mode, the rotation angle of the turret is precise, and a more precise signal reception function is provided.
Owner:WUXI WISEN INNOVATION TECH
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