71 results about "Coordinated Universal Time" patented technology

A system and method for determining a time zone based date and time from a Global Positioning System (GPS) signal, the method including receiving a time zone reference signal at a telematics device, determining a local Coordinated Universal Time (UTC) correction from the time zone reference signal, storing the local UTC correction, and calculating local time from the local UTC correction and the GPS signal. In one embodiment, the time zone reference signal is the GPS signal. In an alternative embodiment, the time zone reference signal is a Code Division Multiple Access (CDMA) signal. In yet another alternative embodiment, the method includes scheduling mobile vehicle communication system activities based on the local time.

The invention relates to the calibration of a satellite clock, and discloses a calibration system for a satellite clock and a calibration method of the system. The calibration system comprises a satellite clock source, a satellite measuring and controlling system, a satellite load system, a ground measuring and controlling station, a ground application station and a clock error fitting server. The calibration method comprises the following steps: 1) compiling a satellite program control operation sheet and loading to a satellite; 2) executing program control operation; 3) generating load data; 4) downloading load data; 5) analyzing the load data to calculate current UTC (Coordinated Universal Time); and 6) carrying out clock data fitting, and giving a corresponding relation between satellite time and the UTC. According to the calibration system for a satellite clock and the calibration method, the current problem that only satellite clock source precision is blindly improved to cause the complicated design of the satellite clock system and a control system, but the improvement effect of the practical working precision is not obvious can be solved. The working precision of the satellite is economically and reliably improved with a large-system closed loop feedback method.

A digital broadcast signal for use in a digital television receiver includes a rating region table carrying rating information for multiple geographical regions, and a master guide table carrying information related to the rating region table. The master guide table includes a version number field defining a version number of the rating region table and at least one effective time field defining an effective time of the version number. The effective time represents a time after which a use of the rating region table is permitted. For example, it may be represented by a number of global positioning system (GPS) seconds since a coordinated universal time (UTC). The effective time field is included in a descriptor within the master guide table.

The invention provides a celestial integrated navigation system time synchronization method. The celestial integrated navigation system time synchronization method comprises that the FPGA (field programmable gate array) of a celestial integrated navigation system receives one or more from effective PPS (pulses per second) of a GNSS (global navigation satellite system), PPS of an external timing source and PPS of a microchip atomic clock, and through PPS synchronization, acquires the PPS applied by the celestial integrated navigation system; the FPGA of the celestial integrated navigation system receives the effective coordinated universal time and the time of the external timing source simultaneously and takes the synchronized PPS as a timing initializing reference to acquire an internal system time, thereby meeting the demands of the celestial integrated navigation system on time precision. The celestial integrated navigation system time synchronization method avoids affecting the data sampling synchronization of the entire system, products sampling pulses and times with different frequency and achieves assessment as well as real-time adjustment of system precision of every unit time.

The invention discloses a time service time leap second processing method, which includes two processes: the input is atomic time and leap second forecast, the output is coordinated universal time, and the input is coordinated universal time and leap second forecast, and the output is atomic time. The present invention adopting the above-mentioned technical scheme provides the conversion from UTC to atomic time, and the conversion from atomic time to UTC. The two time system conversion methods ensure that the systems using UTC and atomic time can be synchronized and unified at the time when the leap second occurs. Avoid the impact of leap seconds on time synchronization and ensure the normal operation of the time synchronization system.

Provided is a timing signal supply device that can frequently perform a phase comparison on a side of receiving a supply of a timing signal and flexibly achieve various operation modes. A GPS receiver 11 includes a baseband processing module 16 and a PN code output terminal 26. The baseband processing module 16 performs a positioning calculation based on positioning signals received from GPS satellites. The PN code output terminal 26 is configured so as to be able to output, based on the result of the positioning calculation by the baseband processing module 16, a PN code that is repeated every second in synchronization with the coordinated universal time.

The invention discloses an automobile instrument clock precision measuring method and an automobile instrument clock precision measuring device. The device comprises a GPS module, a network module, and a measuring host. The GPS module and the network module communicate with the measuring host. The measuring host reads and writes the RTC (Real Time Clock) of an automobile instrument. The clock precision measuring method comprises the following steps: the GPS module acquires a GPS signal, and acquires UTC (Coordinated Universal Time) from the time frame information of the GPS signal; the network module acquires an NTP (Network Time Protocol) data message from a time server, and acquires NTP from the NTP data message; and the measuring host judges whether UTC or NTP is effective, takes effective UTC or NTP as a clock reference source, compares the clock reference source with RTC, and obtains and records a difference value. The time on a GPS satellite time and network time server is taken as a reference clock source. The error is calculated automatically through built-in software of the instrument. The accuracy of RTC precision measurement in the front period of instrument development is improved. Moreover, the device can be integrated with other automatic test equipment to realize uninterrupted record of data and improve test efficiency and precision.

The present invention provides a system and a method for capturing spread-spectrum signals and is applied to the field of direct sequence spread-spectrum communication. The system comprises a satellite navigation time-service module, a trigger logical module, a clock error measurement module and a Doppler calculation module. The satellite navigation time-service module outputs the location, the speed and the time information of a carrier, wherein the time information contains the coordinated universal time and the pulse per second. The trigger logical module receives the coordinated universal time and the pulse per second output by the satellite navigation time-service module, and generates a trigger signal to trigger and generate a spread-spectrum code with the coordinated universal time as a time reference and the pulse per second as an input signal. The clock error measurement module receives the pulse per second output by the satellite navigation time-service module, and then calculates the clock error. The Doppler calculation module receives the location, the speed and the time information output by the satellite navigation time-service module, and calculates the Doppler deviation caused by the relative movement of the carrier. Based on the time-service function of a satellite navigation system, spread-spectrum signals can be quickly captured, while no large amount of hardware resources is occupied. Meanwhile, the communication efficiency is high. The method and the system are particularly advantageous to bursty communications that are shorter in communication time.

A local clock network can have a reference control unit with a reference clock. Coupled to each reference clock can be a plurality of remote stations. User units are in the form of clock indicator units which provided clock signals for use by internal client systems. The network(s) is/are closed loop system(s) between the associated reference and remote user stations. Each reference station determines the latency associated with each remote user station and generates an offset for each user station. Each reference station then generates a specific clock signal for each remote user station on the basis of its reference clock signal adjusted by the appropriate user station offset. A plurality of separate networks can be synchronized by reference to their local Coordinated Universal Time clocks, with one reference station acting as a master station.

A method and a system for reducing time to first fix (TTFF) in a satellite navigation receiver generate a navigation data structure including three sub-frames. A first sub-frame and a second sub-frame accommodate selective ephemeris data. The third sub-frame accommodates a text message including almanac data optionally, ionospheric data, coordinated universal time (UTC) data, textual data optionally, and any combination thereof. A signal generation system (SGS) in the system selectively groups the almanac data, the ionospheric data, and the UTC data, and selectively transmits the navigation data with the almanac data or free of the almanac data in the navigation data structure to the satellite navigation receiver. The signal generation system also staggers the navigation data in each sub-frame into a first portion and a second portion for parallelly transmitting the navigation data over a first carrier frequency and a second carrier frequency in reduced time.

The invention provides a satellite internal equipment timing method and a satellite internal equipment timing system. The method comprises the steps that 1, a satellite host synchronizes a first frame pulse signal of a bus with a UTC (Coordinated Universal Time) sharp second moment, and timing information is triggered and sent by the UTC sharp second moment, wherein the timing information comprises signal waveform of the bus; 2, each slave equipment receives the timing information by the bus, time of detecting the first frame pulse signal of the timing information is locked, and timing is carried out by taking the time as a criterion; 3, when the salve equipment completes receiving the timing information, a second value of the timing information is written into a second time register, a timing value is written into a millisecond register, and timing from the satellite host to the salve equipment is completed. According to the method, the self waveform pulse of the bus is taken as a time PPS (Pulse Per Second) signal, the timing of the PPS signal is completed by a sending edge of the bus, the PPS signal is reduced, a connecting cable is reduced, the connection relation is simplified, the cost is reduced, precise timing is provided, and the reliability is increased.

The invention provides a GNSS timing receiver system delay calibration method based on a time-guard laboratory resource. A satellite navigation system monitored by a time-guard laboratory and a physical implementation UTC in the coordination world are utilized (K), and a high-precision time-frequency signal kept in the time-guard laboratory, and the delay of a GNSS timing receiver system can be calibrated. Compared with a receiver delay calibration method based on the signal analog source, the method is low in cost and does not need additional auxiliary calibration equipment, the calibration step is simple and easy to operate, and the calibration precision is equivalent to that of a receiver delay calibration method based on the signal simulation source. Compared with a relative delay calibration method of the GNSS timing receiver, the method does not need to be implemented by an internal delay known reference receiver, and the method has universality.

The invention discloses a system and method for extracting time information of a Beidou satellite based on an FPGA. The method comprises the following steps that firstly, satellite information output by a Beidou receiving machine is received by an FPGA processing unit, secondly, time of the received satellite information is extracted, so that coordinated universal time is extracted; thirdly, extracted coordinated universal time is converted into national standard time. According to the system and method, the time information of the Beidou satellite is extracted, so that the purpose that a time service is provided through the Beidou satellite is achieved.

Exemplary method, system, and computer program embodiments for establishing an applicable local time zone of a web browser in a computing environment are provided. In one such embodiment, a plurality of time zone offsets is queried over a predetermined period of time to obtain a listing of possible time zones. Ones of the listing of possible time zones matching a polled absolute coordinated universal time (UTC) offset are selected. A plurality of weights are assigned to the selected ones of the listing of possible time zones based on at least one of the matching polled absolute UTC offset, a matching daylight savings observance type, a matching Hyper-Text Transfer Protocol (HTTP) accept-language header and a human population size. The listing of possible time zones is sorted based on the plurality of assigned weights.

Methods and apparatus for providing consistency in Short Message Service (SMS) timestamp formatting (UTC or non-UTC) for mobile communication devices are disclosed. In one illustrative example, a method involves receiving an SMS message intended for a mobile communication device; identifying whether the SMS message has timestamp data formatted in Coordinated Universal Time (UTC) format or non-UTC format; converting the timestamp data from the UTC format to a non-UTC time format based on an identification that the SMS message has timestamp data formatted in the UTC format; failing to convert the timestamp data to a non-UTC time format based on an identification that the SMS message has timestamp data in the non-UTC format; and causing the SMS message to be sent to the mobile communication device. Other techniques involve mobile device usage of a removable user identity module which has a stored indicator in memory which is indicative of a timestamp mode of operation of a home message center as one of a coordinated universal time (UTC) mode and a non-UTC mode.

The invention provides a UTC (Coordinated Universal Time) time realization method applied to a substation and system. The time scale of a synchronous second pulse sent by a time service module and thecurrent time information and the time quality of a time message sent by the time service module are recorded; if the synchronous second pulse is valid and the time quality is in a synchronous state,the output time for a next synchronous second pulse is predicted; a second pulse is generated at the output time for the next synchronous second pulse, when the second pulse arrives, a second counteris triggered, and the second counter is updated to be the current time with one added; when the second pulse does not arrive, counting of a nanosecond counter is triggered; and the current values of the second counter and the nanosecond counter are acquired in real time to complete clock synchronization of the substation. Consistency with the reference time is achieved, and the requirements of high precision and high real-time performance of clock synchronization in the substation are met by utilizing the characteristics of high real-time performance and high stability of an FPGA and the advantages of frequency stability of a constant temperature crystal oscillator counter.

The invention discloses a Beidou short message common-view data compression and transmission method, which comprises the steps of performing compression coding on Beidou short message common-view data, and generating message content; and transmitting the message content, wherein the message content comprises a data head, the time difference number, the coordinated universal time of each satellite corresponding to the system time difference, an ms portion of an average value of local and GPS system time differences, an ms portion of an average value of local and BD system time differences, a 0.1ns portion of the local and system time difference calculated according to each satellite observation quantity and a check bit. Quick and continuous common-view data transmission can be realized according to the method disclosed by the invention.

The invention discloses a civil aviation airborne cockpit clock. The civil aviation airborne cockpit clock comprises a control assembly (100), a display assembly (200) and a power supply assembly (300), wherein the power supply assembly (300) is used for supplying needed voltage for the control assembly (100) and the display assembly (200), the display assembly (200) is an LCD (Liquid Crystal Display) which is provided with a backlight module, and the control assembly (100) comprises a microcontroller (110), a key module (120), a backlight regulating module (130), a clock module (140), a communication module (150), a display driving module (160) and a backlight control module (170). According to the civil aviation airborne cockpit clock disclosed by the invention, the local time and the UTC (Universal Time Coordinated) time can be switched, the civil aviation airborne cockpit clock can be in communication with an airplane control system and other airborne devices, the self-calibration can be carried out, the brightness of a display screen can be regulated, the endurance timing and the stopwatch timing can be carried out, the display power consumption is less, the timing accuracy is high, and the quick identification is easy.