GPS-based accurate time service method and electronic equipment
An electronic device, precise technology, used in the field of GPS
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Embodiment 1
[0029] This embodiment discloses as figure 1 A GPS-based precise timing method shown, comprising the following steps:
[0030] S1 uses the serial port to receive interrupts to receive the UTC clock signal sent by the GPS module in units of seconds;
[0031] S2 combines the PPS signal to perform error compensation operation, and configures the PPS signal input channel in the analysis processor;
[0032] S3 uses the rising edge interrupt to trigger the system, and clears the millisecond data at the first time in the PPS trigger interrupt;
[0033] S4 adds one second to the second clock parsed from the message information sent by the GPS acquired last time;
[0034] S5 outputs accurate synchronous time scale PPS receiver and NMEA-0813 protocol message by decoding satellite signal.
[0035] In this embodiment, the received GPS signal is converted, amplified and processed to interpret the navigation message sent by the GPS satellite, and calculate the three-dimensional position,...
Embodiment 2
[0039] In this embodiment, the C / A code information is obtained by the GPS signal receiving module, and the accuracy can meet the requirements of most industrial and civil environments. The operation of these satellites converts, amplifies and processes the received GPS signals in order to measure the propagation time of the GPS signals from the satellites to the antenna of the receiving module, interpret the navigation messages sent by the GPS satellites, and calculate in real time Three-dimensional position, three-dimensional velocity and time information of the station.
[0040] The GPS receiving module outputs accurate synchronous time-scale PPS receiver and NMEA-0813 protocol messages by decoding satellite signals. The messages contain UTC time, position and other signals. With the increasing integration of GPS receiving modules, the price is also increasing. It is getting lower and lower, and it is used in applications that do not require high precision. Only the output ...
Embodiment 3
[0044] This embodiment discloses as figure 2 Shown a kind of electronic equipment based on precise timing of GPS, including GPS receiving module, serial port receiving interrupt, external PPS input interrupt, microprocessor unit and the memory that is stored with execution instruction, when described microprocessor unit executes described When the instructions stored in the memory are executed, the microprocessor unit executes the precise timing method based on GPS.
[0045]The GPS receiving module of this embodiment is connected with the microprocessor unit through the serial port receiving interrupt and the external PPS input interrupt. The GPS receiving module obtains the C / A code information, captures the signals of the satellites to be measured selected according to a certain altitude cut-off angle, and tracks the operation of these satellites, and transforms, amplifies and processes the received GPS signals.
[0046] In summary, the present invention adopts a method ba...
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