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876 results about "Standard time" patented technology
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Standard time is the synchronization of clocks within a geographical area or region to a single time standard, rather than using solar time or a locally chosen meridian (longitude) to establish a local mean time standard. Historically, the concept was established during the 19th century to aid weather forecasting and train travel. Applied globally in the 20th century, the geographical areas became extended around evenly spaced meridians into time zones which (usually) centered on them. The standard time set in each time zone has come to be defined in terms of offsets from Universal Time. In regions where daylight saving time is used, that time is defined by another offset, from the standard time in its applicable time zones.
Method for matching geographic information with recorded images
InactiveUS6904160B2Easy to operateMinimize the possibilityPosition fixationCharacter and pattern recognitionLogbookData acquisition
A method for matching a recorded image with geographic data substantially corresponding to a geographic location where the image was recorded, is disclosed. In a preferred embodiment, global positioning system data logs are time matched with other data collected, including image data, for the purpose of spatially mapping the collected data. Two important underpinnings of the present invention are that first, the real time of the data acquisition is recorded along with the data acquired; and second, that the offset time between the data logging clock and the world standard time is accurately determined. A primary advantage of the present invention is its wireless functionality; no information transmitters, receivers, special interfaces or power suppliers are required. In addition, a wide variety of off-the-shelf equipment may be used with the present invention as system components.
Owner:RED HEN SYSTEMS
Intelligent observation and identification database system
ActiveUS7439847B2Inexpensive to maintainCheap manufacturingStill image data retrievalElectric signal transmission systemsForeign objectComputer science
Owner:FEDERAL LAW ENFORCEMENT DEV SERVICES
Mobile phone time automatic correction method
InactiveCN1801829ALow costMiniaturization hindranceSetting time indicationRadio-controlled time-piecesTemporal informationAutocorrection
Said invention provides a mobile telephone time autocorrection method. It contains signal reception / transmitting unit, time signal sampling unit memory unit, central processing unit and display unit, said method mainly setting mobile telephone initial time, time adjustment cycle, and standard time source connection mode and time request , when need proceeding time correction, said mobile telephone automatically transmitting time request to standard time source and taking standard time then configuring said standard time as system time of mobile telephone to reach higher time precision by using normal quartz oscillator.
Owner:KUNDA COMP TECHKUSN
Display method and apparatus for navigation system incorporating time difference at destination
InactiveUS20050165543A1Easy to correctGood estimateInstruments for road network navigationRoad vehicles traffic controlTime zoneDaylight
A display method and apparatus for a navigation system calculates and displays an estimated time of arrival (ETA) by a standard time at the destination and a POI (Point of Interest) open / close status at arrival, and a time zone change notice when a user crosses a boundary of the time zones. The display method includes the steps of: examining a position of a destination and monitoring a current position of a user during a travel to the destination; retrieving information on time zones and observation of daylight saving time at the current user position and the destination; calculating the ETA at the destination based on a local time and daylight saving time of the destination using the retrieved information; and displaying the ETA at the destination and a current time.
Owner:YOKOTA TATSUO
Multiple thermostats for air conditioning system with time setting feature
ActiveUS7600694B2Mechanical apparatusTemperature control with auxillary non-electric powerTransceiverThermostat
An air conditioning (HVAC) system for a residential dwelling or other building with enclosed spaces includes multiple thermostats hard wire interconnected or communicating via radio frequency transceivers. The thermostats each include control circuits for adjusting the setpoint temperature at any one thermostat and displaying the set temperature at all thermostats, setting the time at any one thermostat and displaying the time at all thermostats, controlling the thermostat temperature setting from a selected one of the thermostats and providing a setpoint for control of the air conditioning system based on an average temperature sensed by all of the thermostats. A method for correctly setting a thermostat time display to one of Daylight Saving Time or Standard Time and displaying an icon identifying one or the other is disclosed.
Owner:TRANE INT INC
Intelligent Observation And Identification Database System
An intelligent video / audio observation and identification database system may define a security zone or group of zones. The system may identify vehicles and individuals entering or exiting the zone through image recognition of the vehicle or individual as compared to prerecorded information stored in a database. The system may alert security personnel as to warrants or other information discovered pertaining to the recognized vehicle or individual resulting from a database search. The system may compare images of a suspect vehicle, such as an undercarriage image, to standard vehicle images stored in the database and alert security personnel as to potential vehicle overloading or foreign objects detected, such as potential bombs. The system may further learn the standard times and locations of vehicles or individuals tracked by the system and alert security personnel upon deviation from standard activity.
Owner:FEDERAL LAW ENFORCEMENT DEV SERVICES
Method for measuring characteristics of path between nodes by using active testing packets based on priority
Provided are a method for measuring characteristics of a path between nodes by using active testing packets based on priority, i.e., an inter-node path characteristic measuring method, which can measure and provide characteristics of a generated node, when an inter-node data transmission path is generated based on Multi-Protocol Label Switching (MPLS) to provide a path with satisfactory transmission delay, jitter and packet loss that are required by a user, and to provide a computer-readable recording medium for recording a program that implement the method. The method includes the steps of: a) synchronizing system time of the nodes with a global standard time; b) forming each testing packet; c) registering frame sequence and the global standard time during transmission; and d) calculating transmission delay time, jitter and packet loss by using time stamp and packet sequence information of a frame received by the destination node and transmitting the result to the management system.
Owner:ELECTRONICS & TELECOMM RES INST
Method and apparatus for improved pseudo-random number generation
InactiveUS7007050B2Improve securityRandom number generatorsSecuring communicationSecure communicationMobile Telephone Service
A pseudo-random number generator (PRNG) for a cryptographic processing system is disclosed in which the PRNG is reseeded at each instance of input entropy and in which a standard timestamp variable used in determining random sequence outputs is replaced with a running counter. The method employed by the PRNG demonstrates increased resistance to iterative-guessing attacks and chosen-input attacks than those of previous technologies. The PRNG is suitable for use in, for example, a mobile telephone system for accomplishing secure communications.
Owner:WSOU INVESTMENTS LLC
Target time setting game system considering network game
InactiveUS20050255923A1Smooth connectionFlexible responseData processing applicationsVideo gamesSimulationGame play
The invention can finish a game comprising a plurality of stages in a desired time for which a player wishes to play the game. A game machine or a game distributing system has stage storage means (109) for storing the a plurality of stages, model time storage means (108) for storing model times as standard times required to clear each of stages, desired time setting means (104) for setting the time the player wishes to play the game for, and stage selecting means (106). The stage selecting means (106) selects a combination of the a plurality of stages so as to finish the game in a time corresponding to the desired time set by the player with reference to the model time of each stage.
Owner:KONAMI DIGITAL ENTERTAINMENT CO LTD
Three-dimensional space detection system, positioning method and system
InactiveCN105607034ADesigned for easy miniaturizationHigh positioning accuracyPosition fixationNavigation instrumentsThree-dimensional spaceSupersonic waves
The invention discloses a three-dimensional space detection system, a positioning method and a system, the positioning system comprises a positioning base station, a to-be-positioned marking device and a calculating device, the positioning base station synchronizes a standard time with the to-be-positioned marking device, transmits a supersonic wave signal, rotatably transmits a first laser plane signal around a first rotating shaft and rotatably transmits a second laser plane signal around a second rotating shaft which is vertical to the first rotating shaft; the to-be-positioned marking device synchronizes the standard time from the positioning base station and detects the supersonic wave signal, the first laser plane signal and the second laser plane signal; the calculating device is used for determining a three-dimensional space coordinate of the to-be-positioned marking device according to the time of the to-be-positioned marking device detecting the supersonic wave signal, the time of the same detecting the first laser plane signal and the time of the same detecting the second laser plane signal. The system and the method can realize indoor precision positioning based on the supersonic wave signal and the laser signals.
Owner:NOLO CO LTD
Standard time signal receiving time device and decoding method of time code signal
InactiveUS20050195690A1Accurate decodingSimple arithmetic processingSetting time indicationRadio-controlled time-piecesDecoding methodsComputer science
In a radio controlled clock and a decoding method of a time code signal, the time code signal can be accurately decoded irrespective of the mixture of noises and the deterioration of a radio wave signal receiving situation, and arithmetic processing is simple. A standard time signal is received and the time code signal superposed on this standard time signal is sampled at an interval of 50 ms and is stored to a memory. The stored sampling data are formed as a list in a data group every one second (20 samples). The plurality of data groups formed as a list are added every each sampling point, and a point for maximizing an increase change of the adding result is set to a synchronizing point of the sampling. Further, the correlation of the sampling data group and a code template pattern is calculated and a code shown by the sampling data group is judged.
Owner:LAPIS SEMICON CO LTD
Method for measuring characteristics of path between nodes by using active testing packets based on priority
Owner:ELECTRONICS & TELECOMM RES INST
Network attack detection devices and methods
ActiveUS20110185425A1Memory loss protectionUnauthorized memory use protectionDomain nameFeature extraction
A network attack detection device is provided, including a spatial coordinate database for storing spatial coordinate data; a standard time zone database for storing standard time zone data; a domain name system packet collector for collecting a domain name system packet; a spatial snapshot feature extractor for extracting internet protocol address corresponding to the domain name system packet according to the domain name system packet, and generating spatial feature data corresponding to the internet protocol address according to the internet protocol address, the spatial coordinate data and the standard time zone data; and an attack detector for determining whether the domain name system packet is an attack according to the spatial feature data and a spatial snapshot detection model, and when determining that the domain name system packet is an attack, sending a warning to indicate the attack.
Owner:NAT TAIWAN UNIV OF SCI & TECH
Navigation head for auto-changing scale and method thereof
InactiveCN101387521AEasy to watchEasy to guideInstruments for road network navigationMaps/plans/chartsRelevant informationMarine navigation
The invention belongs to the technical field of navigation, and provides a navigation device which can automatically replace scale, and a method thereof. The navigation device which can automatically replace scale comprises a receiving module, a display module, a comparison module, a timing module and a first judging module, wherein the receiving module receives related information from a satellite system; the display module displays an electronic map; at least one standard value is set in the comparison module which receives vehicle running speed output by the receiving module and compares the vehicle running speed with the standard value to determine the section of the running speed; the timing module is connected with the comparison module and calculates the time of a vehicle in a section; and the first judging module receives a time value calculated by the timing module, and determines corresponding scale when the time value is more than or equal to a preset standard time value according to the section of the running speed, then the electronic map with determined scale is displayed on the display module. The navigation device can automatically replace the scale according to the vehicle speed and characteristics of roads, so as to provide convenience for users to watch paths displayed in the electronic map, be favorable for accurate acquisition of detail information on the surrounding of the position of users, and guide the users better.
Owner:SHENZHEN CARELAND TECH
Anti-collision and early-warning system of railway vehicles
InactiveCN102700570ARealize collision avoidance warningReduce use costRailway traffic control systemsEarly warning systemEngineering
The invention provides an anti-collision and early-warning system of railway vehicles. The system is composed of a speed collecting module, an inertia avigation module, a GPS (Global Position System) module, a parameter selection switch module, a display module, a sound module, a data storage module, a wireless network transmission module, a data processing and analyzing software module and the like, wherein the speed collecting module is used for collecting a frequency signal of the vehicle speed; the inertia avigation module is used for acquiring the changes of speed and direction of the railway vehicles entering into a tunnel; the GPS module is used for acquiring location, speed, direction and standard time of the vehicles; the display module is used for displaying speeds, directions, lines, distances and collision residual time information of the vehicle and the other vehicles; the sound module is used for safely alarming; the data storage module is used for storing full-route data in a driving process of the rail vehicle so as to be convenient for subsequent analysis and treatment; the wireless network transmission module is used for realizing real-time transmission of data; and the data processing and analyzing software module is used for analyzing and processing the information and judging whether a collision accident happens or not, as well as performing the corresponding early-warning treatment.
Owner:SOUTHWEST JIAOTONG UNIV
Transmission line malfunction early-warning method and system based on big data driving
ActiveCN106779505AAccurate acquisitionAvoid associationResourcesSpecial data processing applicationsElectricityRelevant information
The invention discloses a transmission line malfunction early-warning method and a system based on big data driving. The transmission line malfunction early-warning method comprises the following steps: acquiring related information of a power transmission line, wherein the related information of the power transmission line comprises electricity quantity, meteorological data, malfunction even sequence information and power grid topological data; extracting characteristics of the related information of the power transmission line, and furthermore establishing a malfunction factor mining databank and a malfunction judgment characteristic bank; based on a Naive Bayes algorithm, performing malfunction factor index mining on data in a current malfunction factor mining databank, and furthermore performing abnormal state tracking on an abnormal malfunction factor; transmitting the malfunction factor index of the abnormal malfunction factor to the malfunction judgment characteristic bank, matching an early-warning information time sequence generated in real time inside the malfunction judgment characteristic bank with a preset malfunction standard time sequence on the basis of a time sequence similarity malfunction matching method, outputting early-warning information corresponding to the matched early-warning information time sequences, and performing early-warning of malfunctions.
Owner:CHINA SOUTHERN POWER GRID COMPANY +1
Method and corresponding device for taming crystal oscillation frequency of time-keeping device
InactiveCN102436174AReduce manufacturing costSmall device sizeSynchronous motors for clocksRadio-controlled time-piecesNavigation systemFirst generation
The invention discloses a method and corresponding device for taming crystal oscillation frequency of a time-keeping device, which comprises the following steps of: step 1, acquiring the standard time pulse A that is located and output by a navigation satellite; step 2, acquiring the standard time pulse B output by device crystal oscillation fractional frequency; step 3, measuring the clock difference between the standard time pulse A and the standard time pulse B; and step 4, if clock difference exists between A and B, adjusting the crystal oscillation frequency of the device to make the clock difference be in the allowed scope. For the time-keeping equipment with pressure control and temperature compensating crystal oscillation or pressure control crystal oscillation, the frequency deviation of the corrected crystal oscillation can be detected in real time by the method provided by the invention to eliminate the time-keeping error caused by crystal oscillation frequency deviation and avoid accumulation of error. Therefore, the invention is suitable for various satellite navigation systems, such as GPS, Beidou first generation navigation satellite, Beidou second generation navigation satellite, GLONASS, GALILEO and other satellite navigation systems.
Owner:TECHTOTOP MICROELECTRONICS
Beidou three-frequency non-differential non-combined observation value time transmission system and method
ActiveCN108919634AReduce observation noiseImprove time transfer accuracyRadio-controlled time-piecesEarth's rotationClock correction
The invention discloses a Beidou three-frequency non-differential non-combined observation value time transmission system and method. The method includes the steps that phase observation value, pseudo-range observation value, satellite ephemeris, earth rotation, antenna phase center and other parameters of China Beidou satellite navigation systems at two time transmission stations are obtained; data check, gross error reject and cycle slip detection are carried out, error models of ephemeris, tide, relativity, the earth rotation, atmosphere and antenna phase deviation are corrected; an ionospheric virtual observation model with additional ionospheric prior information constraints, spatial domain constraints and time domain constraints is constructed; and a three-frequency non-differentialnon-combinatorial precise single-point positioning model is constructed, a single-point positioning timing solution is carried out on corrected data, and comprehensive clock corrections of receivers of the two transmission time stations are obtained and compared to obtain a time transmission difference; and compared with standard time of one of the two transmission time stations, precise time of the other one of the two transmission time stations is obtained. According to the Beidou three-frequency non-differential non-combined observation value time transmission system and method, the observation noise can be reduced, and the accuracy and reliability of time transmission are improved.
Owner:NAT TIME SERVICE CENT CHINESE ACAD OF SCI
Distributed base station clock synchronization method and system
InactiveCN101267251AReduce construction difficultyLower deployment costsRadio transmission for post communicationSynchronising arrangementSystem timeComputer science
The present invention discloses a clock synchronization method of a distributed base station system and a system thereof. An RRU receives a standard time, and the system clock of BBU is regulated through transmitting the standard time and the phase demodulation value of the BBU system time to the BBU. Thereby the system clock synchronizes all the RRU system clocks to obtain the purpose of clock synchronization of the distributed base station. The invention overcomes the problem of difficult installation when anciently the standard time receiving module is installed on the BBU thereby reducing the construction difficulty and disposition cost of the distributed base station. And various different network topological structures can be adapted.
Owner:ZTE CORP
Apparatus for generating digital lane mark
ActiveUS20060020389A1Improve accuracyHighly accurateInstruments for road network navigationPosition fixationCamera imageSteering angle
A digital lane mark generation apparatus of this invention generates a highly accurate and inexpensive three-dimensional mathematical expression orbit map (a digital lane mark), including a GPS coordinate reception unit 13 obtaining GPS coordinates (X, Y, Z) of the vehicle, a gyro sensor 14 calculating measurement values of a gradient (ψ, θ, φ), a camera device 19 photographing as a camera image, a distance meter 15 measuring a driving distance measuring point (1), a speed meter 16 measuring a speed(v), a steering angle sensor 17 measuring a steering angle (ρ), a road surface roughness sensor 18 detecting a road surface roughness (δ), an IC tag information reception unit 11 detecting IC tag position information; an internal timer 12a, and a digital lane mark generation unit 12 generating a digital lane mark by relating each information to a standard time (t), and by using a line segment (S), a circular arc (R), and / or a clothoid curve (A).
Owner:SANEI KK
Weak authentication and key agreement method based on symmetrical password
ActiveCN101917270AHigh speedShorten the lengthKey distribution for secure communicationUser identity/authority verificationCiphertextPassword
The invention discloses a weak authentication and key agreement method based on a symmetrical password, comprising the following steps: 1) presetting a long-term shared secret key k between any two network node equipment A and B; 2) respectively arranging a clock on a node A and a node B, wherein, the error between each clock and standard time does not exceed T0 second; 3) internally installing an encryption algorithm E between the node A and the node B; and 4) building an authentication and session key between the node A and the node B by utilizing the encryption algorithm E and the long-term shared secret key k. The method of the invention has low energy-consumption computation and communication, rapid execution speed and high authentication efficiency, and is suitable for resource-restricted communication environments. As the invention uses a symmetric cryptographic algorithm DES or AES, the difficult degree that opponents capture authentication message to obtain the long-term shared key or a ciphertext is relative to the difficult degree of decoding the DES or AES algorithm, thus ensuring the safety of the ciphertext and the key.
Owner:INST OF SOFTWARE - CHINESE ACAD OF SCI
City railway transport vehicle scheduling management and running chart display method
ActiveCN105253170AIncrease profitImprove efficiencyRailway traffic control systemsReal-time dataProgram planning
The invention discloses a city railway transport vehicle scheduling management and running chart display method comprising the following steps: configuring basic time table elements needed by mapping, setting up city railway transport line data, standard intersite running time, standard stop time and return information in a system data base; 2, generating vehicle scheduling, and storing same in a system real time data base; 3, building up a real time table, and storing same in the system real time data base; 4, forming a predication time table, and storing same in the system real time data base; 5, drawing a vehicle scheduling running chart, a real running chart, and a prediction running chart; 6, calculating an adjusted vehicle scheduling; 7, updating the vehicle scheduling in the system real time data base. The method can improve network utilization rate and date access efficiency, can improve running chart drawing stability and instantaneity so as to meet the demands that the city railway transport train operation needs to be adjusted according to changes of passenger flow and transport organization method.
Owner:NARI TECH CO LTD +1
Hybrid-domain full wave form inversion method of central processing unit (CPU)/graphics processing unit (GPU) synergetic parallel computing
InactiveCN103135132ASolving Convergence ProblemsAvoid the problem of insufficient storage and occupancySeismic signal processingInternal memoryFull wave
The invention discloses a hybrid-domain full wave form inversion method of central processing unit (CPU) / graphics processing unit (GPU) synergetic parallel computing. Compared with a traditional method, the method can be adopted to conduct the CPU / GPU synergetic parallel computing so as to obviously improve computing efficiency. The method enables a forward part of full wave form inversion to be placed to a time domain, namely forward is conducted in the time domain, the forward is converted to be conducted as the inversion in a frequency domain by the discrete fourier transform (DFT) being utilized, namely the DFT is adopted to pick wave field components corresponding to inversion frequency, and the inversion is conducted in the frequency domain from low frequency to high frequency. The method effectively resolves the problem of astringency of a standard time domain method, and avoids the problem that internal memory of wave form inversion of a standard three-dimensional frequency domain and a Laplace domain cannot be satisfied. The method is few in step, reduces computing expenses, and due to the fact the method can be adopted to conduct the CPU / GPU synergetic parallel computing, largely improves speed-up ratio of the computing method.
Owner:INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
Reception circuit, radio-controlled timepiece, and reception circuit control method
InactiveUS7720452B2Accurate demodulationSynchronous motors for clocksElectric windingCapacitanceControl signal
Owner:SEIKO EPSON CORP
Recording medium, recorder, reproducing device and computer-readable recording medium
ActiveUS20020006269A1Short timeTelevision system detailsInformation arrangementRecording durationTime information
To record on a recording medium at least N (N is an integer, N>=1) pieces of data, total management information for managing N pieces of data, and M (M is an integer, 1<=M<=N) pieces of data management information. The total management information has a time zone information indicating a standard time in a representative area where the data is recorded, and the data management information has the data recording time information indicating the time when the data is recorded, and the time zone auxiliary information. The change of the time zone representing an area where the data is recorded, and the time difference correction of the data recording time information can be effected in a short time without causing any inconsistency in the recording time information between the management information and the stream data.
Owner:HITACHI LTD
Multi-camera synchronous triggering device and control method
The invention discloses a multi-camera synchronous triggering device and a control method, thereby achieving the automatic triggering of a plurality of cameras based on a GPS signal. A synchronous trigger receives GPS serial port information and a PPS signal. According to the GPS signal, the flight height, flight speed and preset overlap ratio of an aircraft are resolved according to the GPS signal, and the photographing intervals between the cameras are calculated. According to the photographing intervals, the synchronous triggering is carried out, and feedback signals exposed by the cameras are read. Moreover, the height, speed and time information of camera triggering are stored in an on-board SD card, thereby facilitating the subsequent data processing. The device irons out the defects that a conventional camera trigger cannot be corresponding to the standard time, cannot achieve the storage of data and is short of an exposure feedback signal detection loop when the conventional camera trigger is based on an off-line clock of a local timer, thereby effectively employing the GPS information to facilitate the subsequent data processing, and improving the reliability.
Owner:BEIHANG UNIV
Radio-controlled timepiece and electronic device, control method for a radio-controlled timepiece, and reception control program for a radio-controlled timepiece
ActiveUS20050157592A1Conducive to saving electricityImprove reception reliabilitySynchronous motors for clocksTime-pieces with integrated devicesTime informationEngineering
A motion detection means 5 has a power generation detection circuit 51 for detecting the output voltage of a generating means 4, and a decision unit 52 for determining if the radio-controlled timepiece 1 is moving based on the output voltage from the power generation detection circuit 51. If when a standard time signal is to be received by means of a receiver 2 the not moving detection signal indicating that the radio-controlled timepiece 1 is not moving is output from the motion detection means 5, the reception operation is executed and the time displayed on the time display means 3 is adjusted. By receiving the standard time signal when the radio-controlled timepiece 1 is not moving, accurate time information can be received and the reliability of standard time signal reception can be improved because the reception success rate is also improved.
Owner:SEIKO EPSON CORP
Radio wave receiving device and radio wave receiving circuit
ActiveUS20060023572A1Simple structureSynchronous motors for clocksElectric windingIntermediate frequencyFrequency conversion
A frequency switching signal for switching a reception frequency of an antenna based on a reception success or failure signal output from a detection circuit and a standard time code output from a demodulator is output to a reception frequency selection circuit. The reception frequency is switched to the frequency which is the same as an intermediate frequency other than that of the standard radio waves, and at the same time, an output temporarily stopping signal is output to a local oscillation circuit to temporarily stop the output of a local oscillation signal of the local oscillation circuit, enabling to output the reception signal which was received by the antenna as the intermediate frequency signal without synthesizing and converting it in the frequency conversion circuit to be detected by a detection circuit. Thereby, the reception of the radio wave composed of a plurality of frequencies can be realized with a simple structure.
Owner:CASIO COMPUTER CO LTD
Network load dynamic adaptive parameter adjusting method based on priorities
ActiveCN104185298AReduce collisionMeet the requirements of high service qualityHigh level techniquesWireless communicationDifferentiated servicesData stream
To solve the problem that data stream differentiated services cannot be provided by a standard time slot carriersense multiple access with collision avoidance (CSMA / CA) mechanism in the IEEE802.15.4MAC protocol, the invention provides a network load dynamic adaptive parameter adjusting (DAPA)-CSMA / CA method based on priorities. According to the method, the different priorities are allocated to different nodes according to the requirement for application timeliness, protocol parameter configuration is optimized so as to achieve the differentiated services, network flow changes are adapted to by dynamically regulating backoff indexes, and on the basis, a channel competition process of the DAPA-CSMA / CA method is theoretically analyzed with the combination of the Markov theory. The method has high network adaptive capability, can reduce the frequency of collision between the nodes, the packet loss probability, time delay and energy consumption, and meets the requirement of a wireless sensor network for high service quality in a real-time monitoring environment better.
Owner:HUAQIAO UNIVERSITY
Satellite borne navigation receiver time service method, time service type satellite borne navigation receiver and satellite borne navigation application system
InactiveCN104678408AImprove system reliabilityImprove the clock differenceRadio-controlled time-piecesSatellite radio beaconingElectronic systemsCarrier signal
The invention relates to a satellite borne navigation receiver time service method. The satellite borne navigation receiver time service method comprises the following steps: generating pulse per second; collecting a satellite launching moment and an observation carrier wave phase in a navigation satellite signal at an ascending edge of the pulse per second; calculating a pseudo-range according to the satellite launching moment and the observation carrier wave phase to be used as an observation pseudo-range to construct a resolving equation; resolving to obtain a position, a speed, time, frequency difference and clock difference of a satellite borne navigation receiver; carrying out quality improvement treatment on the frequency difference and the clock difference; adjusting the phase and the frequency of the pulse per second according to the improved frequency difference and clock difference so that the ascending edge of the pulse per second and a standard time second starting moment are synchronized; broadcasting the adjusted pulse per second to other electronic systems on a satellite; before the arrival of the next adjusted pulse per second, broadcasting the position, the speed and the time to the other electronic systems on the satellite; and generating and updating a telemetering quantity related to the time and giving a respond when the navigation satellite requires the corresponding telemetering quantity.
Owner:TSINGHUA UNIV
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