A frequency control assist device is configured to: calculate an average value of pulse numbers each of which is a pulse number of a reference signal generated by an oscillator in one cycle of a PPS signal generated based on a GPS signal, from a total of the pulse numbers counted for a time period whose length is a predetermined number times the one cycle, the average value being an average value of the pulse numbers each for the one cycle; and every time a deviation between a specified value of a reference frequency of the reference signal and the average value falls below a target value, reduce the target value from the current value and increase, from the current value, the predetermined number that specifies the time period for obtaining the total of the pulse numbers from which the average value is to be calculated by an averaging circuit.

A frequency control assist device is configured to: calculate an average value of pulse numbers each of which is a pulse number of a reference signal generated by an oscillator in one cycle of a PPS signal generated based on a GPS signal, from a total of the pulse numbers counted for a time period whose length is a predetermined number times the one cycle, the average value being an average value of the pulse numbers each for the one cycle; and every time a deviation between a specified value of a reference frequency of the reference signal and the average value falls below a target value, reduce the target value from the current value and increase, from the current value, the predetermined number that specifies the time period for obtaining the total of the pulse numbers from which the average value is to be calculated by an averaging circuit.

An electronic device includes: a receiver that receives a satellite signal; and a time corrector that corrects an internal time. The receiver acquires time synchronization information and satellite time information by receiving the satellite signal, detects update timing of seconds on the basis of the time synchronization information, and executes output processing of outputting a synchronization signal, which indicates output timing, and reception side time information including time difference information, which indicates a time difference between the update timing of seconds and the output timing, and time information of hours, minutes, and seconds based on the satellite time information, before next update timing of seconds. The time corrector corrects the internal time on the basis of the synchronization signal and the reception side time information.

The invention discloses a pointer type Bluetooth intelligently time-corrected clock movement, comprising a movement body, wherein the bottom of the movement body is provided with a cell box, the surface of the cell box is provided with a disassembling hole, an hourly chiming module is provided at one side of the cell box, a central microprocessor is provided at one side of the hourly chiming module, a Bluetooth communication module is provided at one side of the central microprocessor, a power management circuit is provided at the other side of the cell box, and a display screen is provided at one end of the power management circuit. According to the invention, through an integrated technological application of optics, electron, mechanical transmission and wireless communication, the control over a mechanical gear assembly is accomplished; through wirelessly receiving time information on an APP software and combining an operating principle of the central microprocessor controlling over a core plate and an optic-coupling device, a novel automatically time-corrected clock product is accomplished. The pointer type Bluetooth intelligently time-corrected clock movement is relatively practical, relatively high in precision, free of influences from factors of geography, signals and the like, and is suitable for broad promotion and use.

A distributed electromagnetic method synchronization system and method involving a satellite communication and navigation system. The method includes the following steps: the transmitter and the receiver establish connection with the satellite respectively to realize the position and time synchronization; the transmitter and the receiver acquire the second-pulse-signal, and according to the second-pulse-signal to adjust their own temperature compensation crystal, so that the frequency reaches the preset value; in the field of operation, the transmitter and receiver through the satellite mutual communication, timely adjustment of the operation process. In the above-mentioned way, the communication function can be set in one place to facilitate the timely adjustment of the data acquisition process so as to ensure the quality of the collected data and improve the efficiency of the field operation.

An electronic device is provided. The electronic device may include a display, a processor operatively connected with the display and configured to generate external reference time information, a display driver integrated circuit configured to periodically or randomly receive the external reference time information from the processor, wherein the display driver integrated circuit is configured to generate internal time information based on an internal clock, to output a clock image corresponding to the internal time information on the display, and if a time error between the external reference time information and the internal time information occurs during the outputting of the clock image, to output the internal time information, the time error of which is corrected, on the display.

A method and apparatus for determining a drift between a local clock of a movable device and a reference clock that is used by one or more reference devices. The local clock may be calibrated at a calibration location and then the movable device may be moved to an operating location that is different from the calibration location. The drift is determined by observing one or more signals transmitted by the respective one or more reference devices, when the device is at the calibration location and when it is at the operating location. These observations are used together with a model of the signals to determine the drift.

A method and apparatus for determining a drift between a local clock of a movable device and a reference clock that is used by one or more reference devices. The local clock may be calibrated at a calibration location and then the movable device may be moved to an operating location that is different from the calibration location. The drift is determined by observing one or more signals transmitted by the respective one or more reference devices, when the device is at the calibration location and when it is at the operating location. These observations are used together with a model of the signals to determine the drift.

A method for adjusting a clock on board a motor vehicle, the clock providing an actual time for functions of the vehicle, the vehicle connected via wireless communication to a data server, the method including: the server transmitting a sequence of consecutive actual-time values, separated from one another by a fixed time interval; the vehicle receiving the actual-time values shifted by an unknown and variable time of flight between transmission and reception; for each received actual-time value: calculating a difference between an actual-time value received at a given instant and an actual-time value received at a previous instant; calculating a discrepancy between the calculated difference and the fixed time interval; calculating a cumulative disparity, consisting in summing the discrepancy calculated for a time value received at one instant and a time value received at the previous instant; determining the actual time for adjusting the on-board clock according to the disparity.

A method for adjusting a clock on board a motor vehicle, the clock providing an actual time for functions of the vehicle, the vehicle connected via wireless communication to a data server, the method including: the server transmitting a sequence of consecutive actual-time values, separated from one another by a fixed time interval; the vehicle receiving the actual-time values shifted by an unknown and variable time of flight between transmission and reception; for each received actual-time value: calculating a difference between an actual-time value received at a given instant and an actual-time value received at a previous instant; calculating a discrepancy between the calculated difference and the fixed time interval; calculating a cumulative disparity, consisting in summing the discrepancy calculated for a time value received at one instant and a time value received at the previous instant; determining the actual time for adjusting the on-board clock according to the disparity.