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107results about How to "Reduce the difficulty of implementation" patented technology

Encoder and decoder for quantum cryptographic communication

The invention provides an encoder and decoder for quantum cryptographic communication. The encoding and decoding functions of a BB84 protocol can be achieved through the encoder and the decoder. According to the encoder and decoder for quantum cryptographic communication, an optical switch device is used at a transmitting terminal, so that optical pulse passes through a plurality of interferometers randomly, the phase differences between long arms and short arms of the interferometers are k*2phi+phi/2 sequentially, and therefore the encoding function required by the BB84 protocol is achieved; a measurement base is randomly selected in a passive mode through an optical beam splitter at a receiving terminal and the decoding function is achieved through the interferometers with the phase differences of the long arms and the short arms to be k*2phi+phi/2. Due to the adoption of the interferometers, high-speed phase modulators do not need to be used in the interferometers, the limit to speed by round-trip time is broken, a phase modulation drive circuit can be obtained through devices according to a low-speed design scheme, the difficulty in achieving a high-speed quantum cryptographic communication system is greatly reduced, and the encoder and the decoder are quite suitable for achieving high-speed quantum cryptographic communication. If the structure of the Michelson interferometer (F-M) with a Faraday reflector adopted is used, the self-adaptation compensation capacity for dealing with polarization disturbance in an optical path is further achieved.
Owner:UNIV OF SCI & TECH OF CHINA

Digital predistortion device and method for band-limited simplified nonlinear filter

The invention provides a digital predistortion device and method for a band-limited simplified nonlinear filter. The device comprises a digital predistorter and a predistortion model training module of a predistortion model based on band limited simplified nonlinear filtering; the digital predistorter performs digital predistortion processing on an input digital baseband signal; a power amplifier outputs an analog radio frequency signal, generates an output digital baseband signal after the analog radio frequency signal is subjected to power coupling by an attenuation coupler, quadrature demodulation by a wideband quadrature demodulator, low-pass filtering by a low-pass filter and analog-to-digital conversion of a low sampling frequency, and inputs the output digital baseband signal after the input digital baseband signal and the output digital baseband signal are synchronized into a predistorter training module; the predistorter training module uses the least square algorithm to perform parameter training and then obtains power amplifier model parameters based on a band limited simplified nonlinear filter function, and sends the power amplifier model parameters to the digital predistorter. The invention uses the band limited method on a nonlinear filter function model to reduce the sampling frequency of a digital predistortion analog-to-digital converter, thereby reducing the difficulty and cost of realizing digital predistortion.
Owner:SOUTHEAST UNIV

Uniform PWM modulation method and system on the basis of natural commutation

The invention is suitable for the technical field of electric power, and provides a uniform PWM modulation method on the basis of natural commutation. The method comprises the following steps: a per-unit value of a three-phase modulated wave is calculated; a real-time maximum value and a real-time minimum value of voltage of the three-phase modulated wave are calculated according to the per-unit value; the phase of the three-phase modulated wave shifts for 30 degrees; the real-time maximum value and the real-time minimum value of the three-phase modulated wave after phase shifting are calculated; zero-sequence components under three modulation modes of SPWM, SVPWM and DPWMx are calculated according to the real-time maximum value and the real-time minimum value of the voltage of the three-phase modulated wave before phase shifting and the maximum value and the minimum value of the voltage of the three-phase modulated wave after phase shifting; the zero-sequence components under the three modulation modes of SPWM, SVPWM and DPWMx are super-positioned in the three-phase modulated wave before phase shifting so that a uniform modulated wave signal is acquired; and the uniform modulated wave signal and a carrier wave signal are compared by a controller so that a driving signal for controlling a switch tube is acquired.
Owner:SHENZHEN GROWATT NEW ENERGY TECH

Detection circuit and method of LC resonant transducer

The invention provides a detection circuit of an LC resonant transducer. The detection circuit comprises an FPGA-based SoPC system, a pulse generator, a transmitting coil, a reading coil and an analog-to-digital converter, the FPGA-based SoPC system controls the pulse generator to generate an excitation signal via the transmitting coil, the LC resonant transducer absorbs energy of the excitation signal and generates an attenuation signal via induction, the attenuation signal is received by the reading coil and sampled by the analog-to-digital converter, the FPGA-based SoPC system calculates a frequency spectrum of output signals of the LC resonant transducer via DFT, and the resonant frequency is detected. The invention also provides a detection method of the detection circuit of the LC resonant transducer. The frequency spectrum of the output signals of the LC resonant transducer is obtained, and a resonant frequency of the LC resonant transducer is obtained via a peak value detection algorithm. According to the detection circuit and method, complexity and excitation signals of the detection circuit of the LC resonant transducer have less interference in the transducer signals, and the measuring speed and portability are improved.
Owner:INST OF ELECTRONICS CHINESE ACAD OF SCI

Vehicle-mounted network security protection system and application method thereof

The invention relates to a vehicle-mounted network information security protection system, which comprises a security engine module, an application program interface module, an authentication module, a security communication module, a data encryption module, an attack protection module, an intrusion detection module and a log system module,wherein the security engine module is a dispatching center of the vehicle-mounted network information security protection system, and is used for establishing a processing flow and a management rule set of the vehicle-mounted network message; the application program interface module is used for providing data encryption and decryption services for an application program; the secure communication module is used for realizing network transmission encryption based on a vehicle-mounted network transmission layer communication protocol and an SSL/TSL encryption transmission protocol; the data encryption module provides algorithm support for data encryption and decryption; the intrusion detection module is used for collecting necessary data and information through methods of real-time mapping, redundant backup and the like of vehicle-mounted network messages; and the log system module is responsible for recording system operation, network flow and operation behaviors.
Owner:北京云驰未来科技有限公司

Automatic automobile clock correction system and correction method thereof

InactiveCN101770207AReduce the difficulty of implementationCalibration methods are fully automatedSetting time indicationRadio-controlled time-piecesAtomic clockCorrection method
The invention aims to provide an automatic automobile clock correction system capable of automatically correcting an automatic clock and a correction method thereof. The automatic automobile clock correction system comprises a clock processing unit and a clock display unit, wherein the clock processing unit comprises a clock signal generating circuit and a clock signal processing circuit; and the clock display unit receives and displays a clock signal transmitted from the clock processing unit; and the key point is that the clock processing unit is connected with a GPS receiving unit through a CAN bus. The correction method comprises the following steps: after the automobile is electrified, the clock processing unit receives a satellite clock synchronous signal by using the GPS receiving unit and corrects the local clock according to the synchronous signal; and after the correction is finished, the clock processing unit shields the satellite clock synchronous signal of the GPS receiving unit, times and generates the clock signal by using the clock signal generating circuit and the clock signal processing circuit arranged in the clock processing unit and transmits the clock signal to the clock display unit for displaying.
Owner:CHERY AUTOMOBILE CO LTD

General-purpose interoperability test system and test method thereof

The invention discloses a general-purpose interoperability test system and a test method thereof. The system comprises a main test control and protocol stack management platform, a general-purpose underlying simulation instrument and an antenna transmission module, wherein the main test control and protocol stack management platform comprises a general-purpose main test control module and a protocol stack substitution and adaptation module, the general-purpose underlying simulation instrument is used for carrying out the function of the physical layer and the switching between baseband signals and radio frequency signals, and the antenna transmission module is used for transmitting radio frequency signals and receiving radio frequency signals coming from a tested terminal. Based on the invention, the interoperability test on different network devices and terminals can be simulated as long as the protocol stacks in different network devices are changed, as a result, the network side hardware devices of different manufacturers do not need to be purchased any more, but each network device manufacturer provides a corresponding protocol stack, consequently, the interoperability test cost can be greatly decreased, and the difficulty in implementing the interoperability test can be reduced.
Owner:THE RES INST OF TELECOMM TRANSMISSION MIIT

Web form design method based on mask

The invention provides a web form design method based on a mask. The method comprises the steps that a control base of the controls required by a form is built, and the controls are configured on a control selection interface; attribute lists corresponding to the controls respectively are built, and the attribute lists are configured on an attribute edit interface; a form preview interface is built, wherein the form preview interface is displayed according to the content of a currently designed form; the mask on the upper portion of the form preview interface area is built, and a mouse and a keyboard in the form preview interface is operated through mask interception; when the form preview interface is clicked with the mouse and the mask captures a mouse event, the control at the position is matched according to the position of the mouse, so that the control is set in a selected state, and the attribute value of the control is displayed in the attribute edit interface. By means of the web form design method based on the mask, a better user experience is provided, the form and the controls are completely displayed in the form preview interface of a form designer according to an actual effect, and what displayed is completely consistent with the actual effect.
Owner:彭志勇

3-mm waveband receiver and application thereof

The invention provides a 3-mm waveband receiver and application thereof. The 3-mm waveband receiver at least comprises a receiving antenna, a low-noise amplifier, a local oscillation signal source, an orthogonal frequency mixer, an orthogonal coupler and an intermediate-frequency amplifier, wherein the receiving antenna is used for receiving radio-frequency signals; the low-noise amplifier is used for amplifying the radio-frequency signals received by the receiving antenna; the local oscillation signal source is used for generating local oscillation signals; the orthogonal frequency mixer is used for mixing the frequency of output signals of the low-noise amplifier and the frequency of the local oscillation signals generated by the local oscillation signal source, and generating and outputting two paths of orthogonal intermediate-frequency signals; the orthogonal coupler is used for performing power synthesis on the two paths of output signals of the orthogonal frequency mixer, and generating and outputting one path of single side band signals; the intermediate-frequency amplifier is used for amplifying the single side band signal outputs by the orthogonal coupler. The 3-mm waveband receiver disclosed by the invention can be used for greatly lowering the cost and the implementation difficulty and also changing the connection sequence of an I/Q output port of the orthogonal frequency mixer and two input ports of the orthogonal coupler so as to realize single side band output and well inhibit mirror image signals.
Owner:SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI

Device and method for detecting high-speed optical communication transmitting equipment

The invention discloses a device and method for detecting high-speed optical communication transmitting equipment, and belongs to the optical transmitting equipment and signal detection technology inthe optical communication field. The device comprises a high-speed photoelectric detector unit, a low-speed analog-to-digital converter unit, an equalization filtering processing unit, a software synchronous processing unit, and a display unit. The method comprises the following steps: 1, outputting a modulated optical transmitting signal through the optical transmitting equipment; 2, converting the optical transmitting signal output by the optical transmitting equipment into a baseband analog electric signal; 3, sampling the baseband analog electric signal to obtain a discrete digital sequence; 4, performing the digital equalization filtering processing to obtain an equalization digital sequence; 5, performing the chirp Z-conversion software synchronous treatment to obtain equivalent synchronization time of the equalization digital sequence; and 6, performing eye pattern reconstruction and display on the equalization digital sequence, comparing with the preset eye pattern template tojudge whether the optical transmitting equipment is qualified. Through the device and method disclosed by the invention, the realization difficulty and cost are effectively reduced; the small and portable analyzer can be developed so as to satisfy the demands of quickly and conveniently checking the products.
Owner:杨爱英

Multi-sampling CMOS image sensor pixel structure and ultra-high speed image acquisition method thereof

The invention provides a pixel structure of a multi-sampling CMOS image sensor and an ultra-high speed image acquisition method thereof in order to solve the technical problems of high cost, poor imaging performance and complex process when the ultra-high speed imaging capability of the CMOS image sensor in tens of nanoseconds level is realized by adopting the prior art. Each pixel structure comprises a photodiode; the n output ports of the photodiode are all connected with a control switch tube; at the output end of each control switch tube, a floating diffusion region capacitor is connected;n floating diffusion region capacitors share a control transistor circuit; a charge output strobe switch is arranged between each floating diffusion region capacitor and the control transistor circuit; n >= 2. The frame interval between the multi-frame buffered images is determined by the transfer time of the image signal from the photodiode to the capacitance of the floating diffusion region. Under the modern CMOS technology, the transfer time can reach the order of hundreds of nanoseconds, and the ultra-high-speed continuous multi-frame imaging under the condition of hundreds of nanosecondstime resolution of the CMOS image sensor can be realized.
Owner:NORTHWEST INST OF NUCLEAR TECH

Satellite geometric feature and attitude estimation method based on foundation observation luminosity signal

The invention discloses a satellite geometric feature and attitude estimation method based on a foundation observation luminosity signal. The method comprises the following steps: S1, establishing a satellite luminosity signal observation model under a foundation observation condition; S2, establishing a 'geometry-attitude-luminosity' database of the satellite; S3, identifying a geometric model and a scale of the satellite; S4, establishing an attitude kinematics equation of the observed satellite; S5, setting an initial parameter of the non-destructive Kalman filter; S6, taking the attitude kinematics equation and the satellite luminosity signal observation model as a time updating model and an observation updating model of a non-destructive Kalman filtering algorithm respectively, and performing updating estimation on satellite attitude parameters at the next observation moment by adopting the non-destructive Kalman filtering algorithm; and S7, taking the satellite attitude parameter estimated in the step S6 as a new observation moment satellite state parameter, repeating the step S6, and stopping iteration when the error of a satellite attitude parameter estimation value is smaller than a set threshold value or the satellite exceeds an observation range so as to obtain a high-precision satellite attitude parameter estimation value.
Owner:HARBIN INST OF TECH
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