Clock source device based on GPS (global positioning system) and constant-temperature crystal oscillator and synchronous control method

Abstract

The invention relates to a clock source device based on a GPS (global positioning system) and a constant-temperature crystal oscillator and a synchronous control method. The clock source device comprises a constant-temperature crystal oscillator module, a master control module, a GPS module, a narrowing circuit module and an auxiliary control module and the like, wherein the constant-temperature crystal oscillator module is connected with the auxiliary control module, the GPS module receives satellite pulse-per-second signals, the auxiliary control module resets a fractional-frequency submodule therein at the regular time according to the satellite pulse-per-second signals and eliminates accumulated errors of the constant-temperature crystal oscillator. The synchronous control method includes calibrating crystal oscillator phase voltage; receiving satellite signals by the GPS module; inputting selected frequency signals to the main control module through a key module; sending the GPS pulse-per-second signals which are subjected to narrowing treatment into the auxiliary control module; sending clock frequency signals of the constant-temperature crystal oscillator module into the auxiliary control module; resetting the fractional-frequency submodule by the auxiliary control module at the regular time according to GPS signals; and selecting signal output frequency signals according to frequency. The frequency signals and UTC (universal time coordinated) are synchronous by the aid of the GPS combined with the constant-temperature crystal oscillator, and the phase error is smaller than 100ns.

Description

(1) Technical field [0001] The invention relates to the technical field of synchronous control, in particular to a clock source device and a synchronous control method based on GPS and a constant temperature crystal oscillator. (2) Background technology [0002] Transient electromagnetic detection method is an effective method for geological detection, especially suitable for mineral exploration, groundwater exploration, underground cavity detection and so on. According to the principle of time-domain transient electromagnetic method, what the receiver receives is the pure secondary field generated by the underground geological body after the transmitter is powered off, which requires that the receiver and the transmitter must be strictly synchronized, and the synchronization error is at least less than 1μs, so Harsh synchronization accuracy is one of the key technologies of the transient electromagnetic detection system. Since the transmitter and receiver are separated in ...

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Problems solved by technology

These three synchronization methods have major disadvantages. Wired synchronization is an economical and effective synchronization technology when the transmitter and receiver are relatively close, but when the transmitter and receiver are far apart, it is difficult to use wired synchronization; Wireless communication synchronization is not affected by the distance between the transmitter and receiver. It is a relatively common method, but it is easily interfered by external environmental factors; the high-precision quartz clock synchronization method is reliable and effective, but the high-precision quartz clock is expensive and the pre-synchronization time is long

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