Satellite navigation receiver and local clock device thereof

Abstract

The invention belongs to the field of satellite navigation and provides a satellite navigation receiver and a local clock device thereof. The local clock device comprises a TCXO clock module, an asynchronous frequency division clock module and an RTC module which are electrically connected in sequence, wherein the RTC module comprises an RTC counter; the TCXO clock module and a navigation main module are electrically connected; the TCXO clock module serves as a local time counter of the navigation main module and a clock source for capturing and tracking a satellite signal; the TCXO clock module is also used for inputting a generated clock pulse into the asynchronous frequency division clock module; the asynchronous frequency division clock module performs frequency division to enable theclock pulse to be close to a preset frequency; and then, the clock pulse is input into the RTC module to be used for counting by the RTC counter. The clock precision of the RTC module is improved.

Description

technical field [0001] The invention belongs to the field of satellite navigation, in particular to a satellite navigation receiver and a local clock device thereof. Background technique [0002] see figure 1 , the prior art satellite navigation receiver mainly includes a baseband processing module, a radio frequency module, a local time counter and a real-time clock (Real_Time Clock, RTC) module. The baseband processing module, radio frequency module and local time counter are the navigation main modules of the satellite navigation receiver, and generally can be powered separately. The RTC module includes an RTC counter and an RTC control module. The RTC module also uses an independent power supply, and can still work normally when the power of the baseband processing module, radio frequency module and local time counter is turned off. The local clock device of the satellite navigation receiver of the prior art generally adopts two kinds of local clock source modules, one...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a satellite navigation receiver and its local clock device, aiming to solve the problem that the clock counting accuracy of the RTC module is poor by using the current clock crystal module without temperature compensation to count the RTC module in the satellite navigation receiver question

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