1987results about How to "Reduce the difficulty of implementation" patented technology

The invention discloses a configurable multi-mode multi-band satellite navigation receiving method and a radio frequency front end module constructed by the method. The front end module can receive signals of satellite navigation and positioning systems such as a global positioning system (GPS), the Big Dipper, a Galileo positioning system and a global navigation satellite system (Glonass), and comprises a configurable low-noise amplifier (LNA) with a buffer and an active balun, a folding passive mixer with a configurable frequency synthesizer, a configurable multi-mode filter, an automatic gain control (AGC) amplifier, a direct-current bias circuit, and a multi-mode multi-band program controlled and coded on-off control word from a receiving system. The radio frequency front end module can meet the requirement of multi-band multi-mode work through the control word programmed by the receiving system, has a simple and reliable structure, does not need complicated time division multiplexing control system and off-chip module, has low cost and high flexibility, and improves the noise performance of the radio frequency front end of the whole receiver and multi-mode multi-band signal processing capacity; and a one-channel signal is input into the module, and the module outputs a two-channel differential signal. The receiver can be used for receiving and processing multi-mode satellite navigation signals asynchronously, and receiving and processing satellite navigation signals with the required mode in different time intervals according to the requirement.

The invention discloses a method for detecting the damage defect of a curved tag based on template matching and similarity calculation, and belongs to the technical field of machine vision and video image processing. The method comprises steps of image acquisition, image preprocessing, template area extraction, defect detection and result display. The image acquisition comprises taking different images of a tag to be tested and a template tag from three angles. The preprocessing process realizes the segmentation of a tag area and an image processing operation for converting a curved surface into a flat surface. The template area extraction achieves one-to-one correspondence between the images of the tag to be tested taken from three different angles and a certain area of a template panorama, enables a bottle rotation angle in image extraction not to be restricted, and reduces system implementation difficulty. A defect detection module, based on a method combining the template matching with the similarity calculation, locks possible defective areas by using short time-consuming template matching, determines whether the defect exists by using exact similarity calculation, and improves detection efficiency on the basis of guaranteeing a detection effect.

The invention discloses a method for recovering vanadium, titanium and iron from vanadium titanium magnetite, comprising the following steps: using mineral powder, coal dust and binder together for agglomeration, reducting the mineral powder in a rotary hearth furnace to obtain a metallized product, then placing the product in an electric furnace by hot charging for melting and separating and obtaining titanium slag containing more than 50% of vanadium-bearing molten iron and TiO2. Vanadium slag is obtained by blowing vanadium in the vanadium-bearing molten iron, semisteel is used to make steel in a converter and the titanium slag can be used as raw material for extracting titanium directly. The method of the invention has high reduction temperature for vanadium titanium magnetite, short time, environmentally friendly, simple process and high yield of vanadium, titanium and iron so as to reach the aim of the comprehensive recovery and application of vanadium, titanium and iron and have good economic benefit and social benefit.

The invention discloses a method for real-time storing and playing multimedia image information. The method for storing includes the following steps: (a) a slicing base directory is established according to names of stored files, and a global index file is established in the slicing base directory; information of a session description protocol in a multimedia file and index information of a slicing file are stored in the global index file, the session description protocol is called as SDP information for short hereinafter; (b)according to the regulation recorded in the index information of the slicing file in the global index file, a directory of the slicing file is established; and (c) the slicing file is established under the directory of the slicing file, and the slicing file includes the index information of each media data packet and the content of each data packet. The method for playing utilizes the global index and a slicing index to position the data packet so as to carry out the operation of playing. By adopting the method in the invention, the storage of file has simple format with small difficulty for implementation, and the cost of the storage device is saved; meanwhile, the experience and feeling of users on the media program is improved.

Provided is an active power distribution network transient state real-time simulation multi-rate interface method based on an FPGA. Example basic information is read under an offline environment, and time te needed for calculation of each time step of an electrical system in the FPGA and time tc needed for calculation of each time step of a control system in the FPGA are calculated; a real-time simulation step size delta te of the electrical system is set according to the te; a real-time simulation step size delta tc of the control system is automatically determined according to a formula (please see the formula in the specification); correlation calculation parameters of elements and the example basic information are figured out and uploaded to an online simulation environment, computing resource allocation is carried out, and simulation time t is equal to zero; calculation of one time step and calculation of k time steps are carried out on the electrical system and the control system respectively, wherein t=t+delta tc, and t=t+delta te; the electrical system and the control system carry out multi-rate interface communication; whether the simulation time reaches simulation ending time is judged. The method is easy to achieve, solving time of the electrical system and the control system can be worked out in advance, proper real-time computing time steps are set, multi-rate interface parallel simulation is achieved, on the premise that simulation precision is guaranteed, solving time is greatly shortened, and the implementation difficulty of active power distribution network transient state real-time simulation is reduced.

The invention discloses a distributed synchronization solar energy street lamp control system comprising a photovoltaic cell array, a centralized control system, a storage cell array and an inverter, wherein the photovoltaic cell array and the storage cell array are respectively connected with the centralized control system connected with the inverter; and the alternating current output end of the inverter is connected with a street lamp sequenced power supply installed on a road. The centralized control system comprises a sensor subsystem and a principal computer control center subsystem, wherein the sensor subsystem comprises a sunlight sensor for detecting the illumination intensity of the street lamp working condition; the principal computer control center subsystem is used for controlling the photovoltaic cell array to convert solar energy into electric energy so as to store the electric energy in the storage cell array according to a signal collected by the sensor subsystem whenthe illumination intensity detected by the sunlight sensor is more than a preset threshold; and otherwise, the storage cell array is controlled to discharge and supply power for the street lamp sequence by the inverter. The distributed synchronization solar energy street lamp control system can improve stability, has high utilization ratio of the photovoltaic cell and the storage cell, lowers application cost and strengthens maintainability.

The invention provides a method for switching multiple operation systems for a mobile terminal based on cloud compute, which comprises: a mobile terminal client software installed on a mobile terminal of a user and used for logging in a remote cloud server, and further comprises server side virtual machine software installed on the cloud server and used for simulating various types of operation systems. The method realizes the switch among multiple operation systems for the mobile terminal by simulating various popular operation-systems on the cloud server side and sharing the mobile terminals with access authority.

The invention discloses a 2D-3D conversable stereo display device, comprising: a device providing image light, a polarized light converter and a lens component, wherein the device providing image light is used for providing image lights of linear polarization, the polarized light converter is used for controllably transmitting the incident image lights of linear polarization completely or incompletely, or rotating the incident image lights into the polarization light vertical to the incident polarization direction, the emergent light is input to the lens component, the lens component comprises a single-refraction lens and a dual-refraction lens which form a combination lens and both comprise a plane part and a relative curve part, the cure parts of the two lenses are wedged with each other, the combination lens can present a convex lens for one of the two polarization light output by the polarization light converter after rotation or no rotation, and can present a plate lens. The 2D-3D conversable stereo display device can freely realize 2D-3D conversion.

The invention discloses a super-resolution angle and time delay estimation based broadband channel estimation method. According to the invention, aiming at a millimeter wave large scale MIMO system ina hybrid analog-digital coding architecture, in order to solve a problem of quantization error influence due to limited quantization angle grid resolution in a traditional compression sensing based broadband channel estimation method, sparsity of a millimeter wave channel it utilized, through designing training signals of a transceiving end, a classical spatial spectrum estimation method is introduced, so that pilot frequency expenditure required by channel estimation can be reduced substantially and an arrival angle and a leaving angle of the millimeter wave channel and a super resolution estimation value of corresponding multi-path time delay can be acquired with high accuracy. Therefore, channel estimation accuracy can be improved distinctively. Besides, according to the invention, phases of a phase shifter in a phase shift network corresponding to an analog pre-encoder and an analog combiner to limited quantization bits, so that practical system implementation is facilitated.

The invention relates to a non coherent demodulation method, which belongs to the signal processing field, is used in Chirp spread spectrum technology demodulation, can reduce phase shift error, multipath time delay error and Doppler shift effect, and achieves better performance over multipath fading channels and IEEE802.15.4a S-V standard channels. The fundamental principle of the invention is: utilizing a Chirp signal as an impulse function in a proper fractional Fourier domain, i.e. fractional Fourier transformation achieves an excellent focusing ability to the Chirp signal sent by the CCS system. For the advantage of Chirp signal processing in fractional Fourier transformation, the fractional Fourier transformation can be used in CSS spread spectrum technology to demodulate Chirp signals with different modulation frequencies. The demodulation to CCS system is realized by implementing fractional Fourier transformation to the received base band data, and judging the code element by detecting the peak value of the focusing order. The method reduces the demand to frequency synchronization, needs no phase synchronization, and achieves better performance over multipath frequency selectively fading channels.

The invention provides a grid-connected photovoltaic power generating system based on a novel direct current converter and a working method of the grid-connected photovoltaic power generating system. The grid-connected photovoltaic power generating system is characterized in that the grid-connected photovoltaic generating power system consists of a direct current converter, a grid-connected inverter, an isolation transformer and a control circuit; the working method comprises the steps as follows: 1. collecting signal; 2. MPPT module data processing; 3 applying an MPPT arithmetic; 4 inverter module data processing; 5. applying a grid-connected arithmetic; and 6. applying SPWM arithmetic. The grid-connected photovoltaic power generating system and the working method thereof have the advantages of small technical realization difficulty, obviously reducing the cost, flexible installation, convenient maintenance, high voltage and current detection precision, advanced control arithmetic, quick running speed of control chip, the system being capable of obtaining excellent tracking precision and stability, combining the hardware device with the software programming of a digital signal processor, simple design, low cost and easy realization of the hardware device, brief and understandable software programming arithmetic.

The invention provides an address allocating method for wideband wireless access system, comprising the steps of: when connecting to network, mobile terminal sends user/equipment authentication request to AAA (Authentication,Authorization and Accounting) server; after the authorization succeeds, the mobile terminal sends registering request to access gateway; the mobile terminal completes registering, the access gateway obtains mobile terminal-supported IP address allocating mode according to the user configuration information returned after the authorization succeeds; the access gateway replaces the mobile terminal as DHCP Client to send IP address allocating request to DHCP server or does not request IP address but waits for the mobile terminal to actively request IP address; the DHCP server allocates IP address to corresponding MAC address, the access gateway transfers the allocated IP address to the mobile terminal and the mobile terminal completes local address binding. And it reduces implementing difficulty and cost, reduces system overhead and speeds up switching.

The invention relates to an all-region parking lot information sharing and parking position reserving method and a system for achieving the method. The system is jointly composed of a parking position reserving module, a parking position management module, a parking lot efficiency analysis module, a payment management module, a user register module, a communication module, a data centre service module, a settlement module, a bill printing module, a notification module, a parking position reserving terminal and a parking position guiding module. A client can operate the parking position reserving module to conduct parking position reserving through the parking position reserving terminal, the parking fee can be paid in advance through the payment management module, reservation can be completed by a parking position reserving service module in a time scope set when the client conducts reservation through the parking position management programming module, and notification is given to the client. If the reservation fails, the payment management module can send back the pre-paid parking fee in the same way. The parking lot efficiency analysis module is mainly used for conducting urban traffic situation auxiliary analysis on traffic flow analysis of a parking lot. The all-region parking lot information sharing and parking position reserving method and the system are low in cost, bring convenience to the client, and are convenient to operate and high in safety performance.

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.

The invention relates to a BP neural network image segmentation method and device based on an adaptive genetic algorithm, and the method comprises the following steps: 1), analyzing a to-be-segmented image, and generating a training sample of a neural network; 2), setting the parameters of the neural network and population parameters, and carrying out the chromosome coding; 3), inputting the training sample for the training of the network, optimizing the weight value and threshold value of the network through employing a new adaptive genetic algorithm, adapting to the crossing and mutation operations, and introducing an adjustment coefficient; 4), inputting the to-be-segmented image, carrying out classifying of the trained neural network, and achieving the image segmentation. The device comprises a training sample generation module, a neural network structure determining module, a network training module, and an image segmentation module. The method introduces the adjustment coefficient which is related with the evolution generations, solves a problem that the individual evolution stagnates at the initial stage of population evolution, and also solves a problem of local convergence caused when the individual adaption degrees are close, thereby obtaining the neural network which can maximize representation of the image features, and achieving the more precise image segmentation.

The invention discloses a method for realizing a software phase-locked loop with an unfixed sampling frequency. The method comprises the following steps: firstly adopting an analog phase-locked loop digital controlled oscillator of the DSP period counter to obtain digital controlled oscillator output signals; then working out the phase error between the mains voltage and a reference signals in the DQ-transformation phase demodulation mode by using the digital controlled oscillator output signals as the reference signals; and establishing a closed loop transfer function secular equation of a phase-locked loop system and determining the parameters of the designed loop filter based on the digital controlled oscillator output signals and the phase error between the mains voltage and the reference signals. The invention can maintain the fixed number of the sampling points in the primitive period, and is used for repeatedly controlling various grid-connected converting devices, such as active electric filters, new energy-powered grid-connected converters and the like. By adopting the DQ-transformation phase demodulation mode, the invention can well inhibit the harmonic and unbalanced mains, resist the fluctuation of the mains voltage, and ensure the reliable operation of the phase-locked loop under the conditions of multiple mains voltage zero passage, voltage harmonics, voltage fluctuation and mains voltage imbalance.

The invention discloses a novel kernel tree self-organizing dynamic routing algorithm, including kernel tree generating course, kernel tree dynamic maintaining course and kernel tree-based route selecting course, according to the relative rank relationship between source node and destination node, dividing the transmission path into two directions, namely downgoing direction of known destination address and upgoing direction of unknown destination address, thus implementing the route selection of the kernel tree; by the change of communication topological structure, locally reconstructing the kernel tree, and implementing dynamic maintenance of the kernel tree. It can construct wireless self-organizing network into a tree-shaped topological structure and implements route selection and communication on this tree-type structure. It is simple and effective, practical.

The invention discloses a double-tuned microwave spectrum analyzer. After a microwave input signal passes through a switch filtering matrix, the first frequency conversion of the microwave input signal is realized by utilizing a big step tunable microwave local oscillator, and the second frequency conversion of the microwave input signal is executed by utilizing a tunable radio frequency local oscillator with continuous frequency, so the frequency spectrum measurement of the microwave signal is realized. Requirements of various users on measurement can be met by changing the frequency of the step tunable microwave local oscillator and combination of filters of the switch filtering matrix according to requirements of users on practical measurement; and the double-tuned microwave spectrum analyzer is simple in design and easy to realize, and greatly lowers the measurement cost of users.

The invention discloses a wireless optical orthogonal multi-carrier communication method with a low peak to average power ratio. The wireless optical orthogonal multi-carrier communication method comprises the following steps that at a transmitting end, firstly, modulated frequency domain signals are converted into a semi-positive definite planning convex optimization problem by adopting a tone injection algorithm via a relaxation method, and solving is carried out through general convex optimization and randomized methods; secondly, the frequency domain signals are symmetrically mapped to subcarriers in a conjugate mode, and a cyclic prefix is added after reverse fast Fourier transformation; at last, time domain transmission signals are added into direct-current offset to drive a light-emitting diode to emit light. At a receiving end, photovoltaic conversion is achieved through a photodiode; signals are removed from the cyclic prefix and conjugate symmetry parts after amplification, filtering, analog-digital conversion and fast Fourier transformation; the signals are modulated to be recovered in an original planisphere; at last, receiving symbols are obtained through demodulation. According to the wireless optical orthogonal multi-carrier communication method, the peak to average power ratio of a wireless optical communication PFDM system can be effectively reduced, requirements of a power amplifier and an LED for linear degrees are reduced, non-linear distortion is reduced, and receiving performance is improved.

The invention relates to a multi-channel sound wave communication system and method. Effective information can not be transmitted by purely using an ultrasonic wave frequency characteristic, and less frequency points exist. The information is transmitted by using amplitude modulation, and error rate is high. The multi-channel sound wave communication system comprises a sound wave information generator and a sound wave information receiver, wherein the sound wave information generator comprises a first microphone, a first analog to digital conversion module, a channel selection module, a DDS (Direct Digital Synthesizer) carrier generation module, an FSK (Frequency Shift Keying) modulation module, a code element information storage module, a coding module, a first clock module, a digital to analog conversion module, an analog filter module, an amplifier module and a speaker. The sound wave information receiver comprises a second microphone, a second analog to digital conversion module, a digital down converter module, a digital filter module, a down-sampling module, an automatic gain control module, a synchronous decision module and a second clock management module. The multi-channel sound wave communication system has a simple structure, and avoids that each path of traditional FSK demodulation is subjected to a large quantity of digital signal processing operation.

The invention discloses an interactive method and system in virtual reality and a terminal device. The method comprises the steps of detecting an operation instruction of a user; in response to the operation instruction of the user, moving a virtual control point on an interface; and detecting the position of the virtual control point in real time, and when it is detected that the virtual control point deviates from a preset range of a central line of the interface and the retention time in a region in which a control is located exceeds a preset time threshold, rotating the control for a certain angle and performing display. According to the method, the system and the terminal device, the user can view information more comfortably when viewing and selecting a control on the edge of the interactive interface, so that the user experience is enhanced; and the existing interface structure is not destroyed when the interactions are finished, so that the running resource consumption and the difficulty of realization are not increased.

The invention relates to a high-efficiency global optimization method using adaptive radial basis function based on fuzzy clustering, belonging to the technical field of modern engineering optimization designing. The method comprises the following steps: gradually constructing a proxy model of a complicated analysis model relating to an engineering design problem by the adaptive radial basis function; classifying the function values of a proxy model on a known mesh point aiming at the proxy model by adopting a fuzzy clustering method; searching a key area which is possibly saved to the global optimal point; and optimizing the proxy model by using the global optimizing algorithm in a small range in the key area until the optimal value of the engineering design problem is acquired. The optimization method overcomes the defect of time-consuming operation when the traditional global optimization method is used in the engineering design problem, can effectively reduce operation cost, improve optimization efficiency, is advantageous to shortening the period of engineering optimization design, and has the capability of global searching.

The invention provides an integral image-based quick ACCA-CFAR SAR (Automatic Censored Cell Averaging-Constant False Alarm Rate Synthetic Aperture Radar) image target detection method, comprising the following steps of: (1) providing a G0 distribution-based self-adaptive global threshold CFAR pre-segmentation algorithm used for generating a target index matrix by combining the statistical property of data; (2) providing an integral image-based G0 distribution statistical parameter quick estimation method, wherein the statistical parameter can be calculated through simple operations such as addition and subtraction once 2-order and 4-prder integral images of an original image are obtained during the implementation of the method; and (3) giving out a basic implementation process of the ACCA-CFAR SAR image target detection method. Through the integral image-based G0 distribution statistical parameter quick estimation strategy provided by the invention, the time efficiency of the method can be greatly improved and the time complexity of the method is irrelevant to the size of a sliding window; and the requirement of the existing automatic target recognition (ATR) system on the treatment of large-scene data can be met to a great extent.