30results about How to "Received signal is stable" patented technology

The invention discloses a mobile terminal communication method. An external antenna is arranged in a protective back cover of a mobile terminal. The method comprises the following steps that: the mobile terminal detects signal intensity in a current environment; and the mobile terminal is controlled to use an internal antenna or the external antenna to perform wireless communication according to the detected signal intensity value. The invention also discloses the mobile terminal. By the method and the mobile terminal, a good communication effect can be achieved in an environment which has low signal quality, so that communication quality can be improved.

The invention discloses a three-dimensional ultrasonic wind speed and wind direction detection system and a measurement method. The detection system comprises a mounting base, a plurality of measurement arms, ultrasonic probes and a control and processing circuit board, wherein the quantity of the ultrasonic probes is equal to that of the measurement arms; one measurement arm is fixed to the center of the top surface of the mounting base, and the remaining measurement arms are arranged on the circumference of the top surface of the mounting base in a surrounding mode; the ultrasonic probes are arranged at the top ends of the measurement arms; the control and processing circuit board is arranged in the mounting base, is connected with the ultrasonic probes and controls the ultrasonic probes to work. The measurement method comprises the first step that all modules are initialized through a control and data processing module; the second step that a wind speed component V1 can be obtained according to transmission time t1 and t4 by the adoption of an indirect time difference method; the third step that three-dimensional wind speed values and wind direction values are obtained; the fourth step that real-time three-dimensional wind speed and wind direction are obtained. The three-dimensional ultrasonic wind speed and wind direction detection system and the measurement method have the advantages that received signals are stable; the instrument cost is greatly lowered; measurement accuracy is high, and real-time performance is good.

The invention discloses a multi-input multi-output array type ultrasound anemometry system and method. The multi-input multi-output array type ultrasound anemometry system comprises an installation seat, a plurality of ultrasound sensors, a fixing supporting frame, a reflection hemisphere and a control and processing circuit board, wherein the multiple ultrasound sensors are arranged on the top surface of the installation seat, the lower end of the fixing supporting frame is fixed to the installation seat, and the reflection hemisphere is arranged at the upper end of the fixing supporting frame. The multi-input multi-output array type ultrasound anemometry method includes the following steps that firstly, after the system is powered on, a data processing module carries out processing; secondly, sliding average processing is carried out; thirdly, cross-correlation calculation is carried out; fourthly, any ultrasound sensor on the x axis, any ultrasound sensor on the y axis and the reflection hemisphere can form an anemometry surface; fifthly, real-time wind speed and wind direction can be obtained by circulating the first step to the fourth step. The multi-input multi-output array type ultrasound anemometry system and method have the advantages that eddies are avoided, receiving signals are stable, and the anemometry accuracy of the wind speed and wind direction is further improved.

Provided are an automatic gain control (AGC) apparatus using an efficient receiving structure of an impulse signal-based ultra wideband wireless communication system, and a method thereof. An AGC apparatus of an impulse signal-based wireless communication system guarantees an SNR received through an analog circuit unit, outputs correlation values with respect to an impulse preamble of the received signal, outputs the maximum value of the correlation values for each symbol among the correlation values, or divides a symbol period into a plurality of groups and obtains average values through a sum of each group to output the maximum value thereof.

A diversity receiving apparatus receives first and second reception signals and is constituted by including one or more phase shifters that generate one or more third signals having phases different from the second reception signal based on the second reception signal, a correlation calculator that obtains a correlation between the first reception signal and each of the second reception signal and the third reception signals, a correlation comparator that selects the reception signal having the highest correlation with the first reception signal from the second reception signal and the third reception signals, a selector that selects and outputs the second reception signal or the third reception signal selected by the correlation comparator; and a combining device that outputs a signal formed by combining the first reception signal and the reception signal output from the selector.

The invention relates to a multi-target six-freedom-degree electromagnetic positioning device and method, and belongs to an electromagnetic positioning device and method, The device consists of a signal transmitting unit, a signal receiving unit, and a control and data processing unit. According to the positioning demands, the number of signal receiving sensors is selected, and the selected signal receiving sensors are fixed on a positioning target, and generate receiving signals through electromagnetic induction. The control and data processing unit receives a sampling signal, and executes an electromagnetic positioning algorithm. The device solves a problem that a conventional device is poorer in the tracking and positioning of a target moving in a large area in a space, optimizes the positioning method, simplifies a circuit, improves the positioning efficiency, and solves a problem of an error caused by the mutual impact of the position parameter and posture parameter solving processes during six-freedom-degree solving.

The invention discloses an adjustment-facilitating aerospace radar fixing device comprising a base. A balance table is fixedly connected on the upper end of the base. An electronic level gauge is embedded in the corner of the upper surface of the balance table, and a rotating table is fixedly connected on the upper end of the balance table. The inflexibility of the conventional radar fixing deviceis improved, and whether the balance table is horizontally placed can be automatically measured by the electronic level gauge and the hydraulic lifting lever so as to ensure that the balance table isalways placed horizontally, the radar is enabled to receive signals more stably and the information receiving accuracy of the radar can also be enhanced; then the radar can rotate for 360 degree along the horizontal direction through the first servo motor and the rotating table, and the cover can be adjusted in the vertical direction through cooperation with the second servo motor and the secondrotating rod so that the radar is enabled to receive the signals more stably. The device is simple in structure and convenient to operate so that the radar fixing device is further improved.

Disclosed is a near field communication (NFC) and frequency modulation (FM) antenna system which is applied to a portable electronic apparatus. The system comprises an antenna, an NFC chip, an FM chip, a master control chip, a common coupling module electrically connected with the antenna, a gating module electrically connected with the common coupling module and the master control chip, an NFC coupling module electrically connected between the gating module and the NFC chip, and an FM coupling module electrically connected between the gating module and the FM chip. The common coupling module is used for coupling the antenna to multiple frequency bands for sharing, the master control chip is used for sending a control signal to the gating module and controlling the gating module to conduct the antenna to the NFC coupling module and the NFC chip or conduct the antenna to the FM coupling module and the FM chip, when the antenna is conducted and connected to the NFC chip, the NFC coupling module is used for tuning to the work frequency of the NFC chip, and when the antenna is conducted and connected to the FM chip, the FM coupling module is used for tuning to the work frequency of the FM chip.

A diversity receiver capable of stably receiving an orthogonal frequency division multiplex signal, wherein a demodulator is so operated that the attenuation of the received signal is varied step by step every time a period corresponding to a guard interval section comes if it is determined that the reception level is increased by switching the attenuation in any one of variable attenuators, and the demodulator is so operated that the variable attenuator designated by an antenna control pointer is changed and the attenuation is varied if it is determined that the variable attenuator designated by an antenna control pointer is identical with the variable attenuator designated by an antenna fixing pointer.

The reception system of the present invention includes a detection circuit serving as detecting means for detecting that the strength of the receiver signal is equal to or greater than a predetermined value, and a resetting circuit serving as resetting means for, under instruction of the detection circuit, immediately increasing power consumption of the reception section when the detection circuit detects a large signal so as to bring back the state where the reception system ensures the greatest power consumption amount for the entire system and the sufficiently-desirable system performance. Consequently, this invention provides an effect of reducing power consumption amount of the entire system, and an effect of stable reception by preventing reception failure even when a large interfering signal is suddenly supplied due to a change in peripheral radio wave condition.

A stretchable antenna assembly and a notebook computer with the antenna assembly thereof, comprising an antenna module and a holder which respectively has a guiding unit corresponding to the antenna module and the holder, and further the antenna module couples to a signal transmission element for activating with a first conductive element disposed at one side of the holder, resulting in preventing the antenna signal transmission from being interrupted whenever the antenna module is open or closed, and in further ensuring the precise locating function, and strengthening the receipt of signal.

The invention discloses a vehicle-mounted navigator with high interference resistance. The vehicle-mounted navigator comprises a panel, a case and a navigation control circuit board arranged in the case, wherein the panel comprises a panel rack, a display screen and a multimedia control circuit board; the case comprises a top plate, a bottom plate, a back plate and two side plates; a clapboard is vertically arranged between the navigation control circuit board and the panel and is fixedly connected with the top plate, the bottom plate and the two side plates of the case. The signal interference in the navigator can be reduced, so that the navigation is accurate; furthermore, the vehicle-mounted navigator is high in radio signal receiving capacity.

The invention provides an energy-saving device for an electronic product. The energy-saving device comprises a primary battery, a first storage battery, an electric energy switching device, a backlight mirror, keys, a light-emitting board, a compression spring piece, a second storage battery, a relay, a printed circuit board, a single chip microcomputer, an analog-to-digital converter, a temperature sensor and a fan, and the upper end of the primary battery is connected with the first storage battery and the electric energy switching device. By the design, mixed use of traditional electric power and new energy is realized, the backlight mirror is mounted at the front end of the light-emitting board, the keys are mounted at the front end of the light-emitting board, the compression spring piece is assembled at the rear end of the light-emitting board, and the second storage battery is arranged at the rear end of the compression spring piece. According to the design, the keys are illuminated, the single chip microcomputer and the analog-to-digital converter are welded on the printed circuit board, the upper end of the single chip microcomputer is connected with the temperature sensor, the fan is assembled at the upper end of the temperature sensor, and an intelligent cooling function is achieved. The energy-saving device is convenient to use, good in cooling effect and stability and high in reliability, mixed energy can be shared, and the keys can be brightened.

The invention discloses an LED (Light Emitting Diode) white light receiving and amplifying circuit for communication. The circuit comprises a receiving and amplifying circuit and an AGC (Automatic Gain Control) circuit, wherein the receiving and amplifying circuit receives an LED light signal and amplifies and outputs the LED light signal to the AGC circuit; the gain compensation of the LED light signal is controlled by the AGC circuit; and finally, the LED light signal is output by the AGC-Vo end of the AGC circuit. The LED white light receiving and amplifying circuit for communication has functions of high magnification factor, gain compensation, and the like, stable signal receiving, high precision and high response speed and is easy for waveform demodulation.

The invention discloses vehicle-mounted Beidou equipment with an anti-interference function, and the equipment comprises a fixed block which is provided with a first installation groove and a second installation groove, the first installation groove and the second installation groove are communicated through a through groove, the interior of the first installation groove is slidingly connected with a first installation plate, and the first installation plate is provided with a damping plate. And a Beidou terminal is installed on the damping plate, a plurality of damping pieces are arranged between the first mounting plate and the inner bottom of the first mounting groove, a second mounting plate is slidably connected into the second mounting groove, and a damping mechanism is arranged between the second mounting plate and the first mounting plate. The vehicle-mounted Beidou equipment is reasonable in structure, capable of effectively damping the Beidou terminal and the satellite receiver, capable of stably receiving signals and effectively protecting the Beidou terminal and the satellite receiver, not prone to damage, capable of conveniently adjusting the position of the satellitereceiver, easy to operate, capable of being turned over and fast, and capable of bringing convenience to a user.

The invention discloses an automatic gain control method and device, a receiver and an ultra-wideband communication system, and particularly relates to the technical field of wireless communication. The method comprises the following steps: presetting a power threshold of a received signal; judging whether the power of the received signal meets the power threshold based on the power threshold; and if the power of the received signal meets the power threshold, performing analog gain control according to the power of the received signal. The power threshold of the received signal is preset to obtain the ideal power of the received signal, and then the power of the received signal meeting the power threshold is utilized to perform analog gain control, so that the gain adjustment frequency is reduced, signal convergence is completed in a short time, the synchronization of the ultra-wideband signal in the time domain and the frequency domain can be completed in a short time, and the stability of signal transmission can be ensured.

The invention discloses an electronic communication antenna automatic control device based on the Internet of Things, and relates to the technical field of communication antennas. Aiming at the problem that a communication antenna is inconvenient to adjust to thereby influence the signal reception, is not convenient to move, and does not have the protection measures, the electronic communication antenna automatic control device based on the Internet of Things comprises a shell, a first motor is fixed to the inner wall at the lower side of the shell, and the output end of the first motor is fixedly connected with a first bevel gear. The first bevel gear is engaged with two symmetrically-arranged second bevel gears, the two second bevel gears are both and fixedly connected with one ends of rotating shafts correspondingly, the other ends of the two rotating shafts are fixedly connected with third bevel gears correspondingly, and the two third bevel gears are engaged with fourth bevel gears correspondingly. According to the present invention, the communication antenna can be adjusted at multiple angles, the communication antenna can be moved and carried conveniently, and the communication antenna can be protected when the communication antenna is carried and placed.

A diversity receiving apparatus receives first and second reception signals and is constituted by including one or more phase shifters that generate one or more third signals having phases different from the second reception signal based on the second reception signal, a correlation calculator that obtains a correlation between the first reception signal and each of the second reception signal and the third reception signals, a correlation comparator that selects the reception signal having the highest correlation with the first reception signal from the second reception signal and the third reception signals, a selector that selects and outputs the second reception signal or the third reception signal selected by the correlation comparator; and a combining device that outputs a signal formed by combining the first reception signal and the reception signal output from the selector.

The invention provides a method and system for reading terminal ammeter data, and relates to the technical field of communication. The method for reading the data of the terminal ammeter comprises the following steps of: controlling the terminal ammeter to acquire a current signal; converting the current signal into predetermined system data information as current data; establishing a wireless communication line of the terminal ammeter, and sending the current data to a user side through the wireless communication line; and by the user side, using APP to receive the current data. According to the method and the system for reading the terminal ammeter data, signals can be timely and stably received, test data can be visually and clearly watched, the test data can be changed, deleted and stored in real time, a one-key calibration function is realized, potential danger of high voltage to users is eliminated, transmission and management of current data are facilitated, and the method is higher in precision, more stable, lower in cost, safe and reliable.

The invention discloses a speech preamplifier circuit used for a teaching microphone. The speech preamplifier circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, an integrated circuit, a diode, signal input equipment of the microphone, a potentiometer and a switch tube, wherein the supply voltage input end is connected to the first end of the first resistor, the power source end of the integrated circuit and the first end of the fifth resistor. According to the speech preamplifier circuit used for the teaching microphone, the speech preamplifier circuit is capable of distinguishing a speech input signal and a noise input signal through a level detector formed by the second capacitor and the third resistor. The speech preamplifier circuit has the advantages of simple structure and a stable receiving signal.

The invention provides an energy-saving device for an electronic product. The energy-saving device comprises a primary battery, a first storage battery, an electric energy switching device, a backlight mirror, keys, a light-emitting board, a compression spring piece, a second storage battery, a relay, a printed circuit board, a single chip microcomputer, an analog-to-digital converter, a temperature sensor and a fan, and the upper end of the primary battery is connected with the first storage battery and the electric energy switching device. By the design, mixed use of traditional electric power and new energy is realized, the backlight mirror is mounted at the front end of the light-emitting board, the keys are mounted at the front end of the light-emitting board, the compression spring piece is assembled at the rear end of the light-emitting board, and the second storage battery is arranged at the rear end of the compression spring piece. According to the design, the keys are illuminated, the single chip microcomputer and the analog-to-digital converter are welded on the printed circuit board, the upper end of the single chip microcomputer is connected with the temperature sensor, the fan is assembled at the upper end of the temperature sensor, and an intelligent cooling function is achieved. The energy-saving device is convenient to use, good in cooling effect and stability and high in reliability, mixed energy can be shared, and the keys can be brightened.

The invention discloses a multi-lobe high-gain UV (ultraviolet) omnidirectional AM (amplitude modulation) antenna which comprises an insulating plate, a substrate, two V frequency signal radiation units, an AM vibrator winding magnetic rod and an amplifying circuit. The substrate is arranged above the insulating plate, the two V frequency signal radiation units are positioned between the insulating plate and the substrate, four signal radiation portions, a feeder unit and an impedance matching unit are printed on the substrate, the four signal radiation portions are annularly arrayed on the upper surface of the substrate, so that the antenna receives UHF (ultra-high frequency) band signals in a 360-degree direction, the two V frequency signal radiation units are distributed around an insulating layer and used for receiving VHF (very high frequency) band signals, and the AM vibrator winding magnetic rod is arranged on the insulating layer and used for receiving AM and FM (frequency modulation) signals. By the aid of the radiation units for receiving UHF and VHF and the winding magnetic rod for receiving AM and FM, the antenna can receive the UHF, VHF, AM and FM band signals more strongly and stably, signal structure frequency bands are widened, the VHF frequency band receives the signals in an omnidirectional manner through a circular structure, and the UHF frequency band receives the signals in an omnidirectional manner through the four radiation portions.

The invention relates to the field of signal antennas, and discloses a signal receiving device with an anti-jamming mechanism, which includes a fixed plate and a signal antenna. A horizontal spring is installed, and a shock absorbing rod is installed on the top of the moving plate, and the top of the shock absorbing rod is hinged with the bottom of the signal antenna, and a plurality of miniature electric push rods are installed on the top of the fixed plate. The top of the push rod is equipped with the same protective cover, the outside of the signal antenna is equipped with a plurality of telescopic antennas, the end of the telescopic antenna away from the signal antenna is hinged with the inner wall of the protective cover, and the power line is installed on the signal antenna. The signal receiving device with the anti-interference mechanism can provide better protection and anti-interference blocking for the signal antenna, so that the signal antenna can send and receive signals more stably and efficiently.

The invention relates to a multi-target six-freedom-degree electromagnetic positioning device and method, and belongs to an electromagnetic positioning device and method, The device consists of a signal transmitting unit, a signal receiving unit, and a control and data processing unit. According to the positioning demands, the number of signal receiving sensors is selected, and the selected signal receiving sensors are fixed on a positioning target, and generate receiving signals through electromagnetic induction. The control and data processing unit receives a sampling signal, and executes an electromagnetic positioning algorithm. The device solves a problem that a conventional device is poorer in the tracking and positioning of a target moving in a large area in a space, optimizes the positioning method, simplifies a circuit, improves the positioning efficiency, and solves a problem of an error caused by the mutual impact of the position parameter and posture parameter solving processes during six-freedom-degree solving.

The invention provides a signal receiving device, a control method of the signal receiving device and an optical communication system, and the control method of the signal receiving device comprises the steps: obtaining a current first control voltage of an optical signal intensity adjustment device, a current second control voltage of an optical detector, and a current AD sampling value and a target AD sampling value of an AD sampling device; calculating initial incident light power according to the current AD sampling value, the current first control voltage and the current second control voltage; calculating a target first control voltage and a target second control voltage according to the target AD sampling value and the initial incident light power; and respectively updating the current first control voltage and the current second control voltage based on the target first control voltage and the target second control voltage. By implementing the invention, the self-adaptive control and optimization of the received signal are realized, and the transmission performance of an optical communication system and the stability and reliability of communication are improved.