Clock-temperature-error compensation method and system thereof

Abstract

The invention relates to the field of related clock error compensation technology, and in particular relates to a clock-temperature-error compensation method and a system thereof. The clock-temperature-error compensation method comprises the following steps of: measuring the temperature at initial time, obtaining and storing a first temperature value, and storing the first temperature value; after measuring time T, measuring the temperature again and obtaining a second temperature value; adopting the first temperature value or the second temperature value as the measuring temperature, and according to the relation between the measuring temperature and the clock crystal-oscillator error, calculating and obtaining an error value of a clock; calculating a clock error of the measuring time T; repeatedly executing the steps from step 2 to step 4, till the clock error accumulated value is larger than a preset clock adjusting threshold, adding the value same as the clock adjusting threshold for the clock, and executing the steps from step 2 to step 4 again. The clock-temperature-error compensation method has the advantages that the clock compensation can be realized only by using the common circuit and algorithm without needing to use GPS or a function clock chip with expensive price and adjustable oscillating circuit frequency, so that the production cost is greatly reduced.

Description

technical field [0001] The invention relates to the related technical field of clock error compensation, in particular to a clock temperature error compensation method and system thereof. Background technique [0002] The crystal oscillator frequency is easily affected by the external temperature. General clock chips do not have temperature compensation function, so temperature changes will directly affect the accuracy of the clock. The vehicle environment is relatively harsh, and the ambient temperature in the vehicle varies greatly. In such a harsh environment, it is difficult to realize a high-precision clock. In cars with high configuration, in order to solve the problem of clock accuracy, the method of synchronizing the local clock with the GPS clock is generally adopted. But now most cars are not equipped with a GPS module, and the clock cannot be synchronized with GPS. Now there are clock chips with temperature compensation function on the market, but they are muc...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a clock crystal oscillator temperature error compensation method and its system to solve the existing technical problem that adjusting the frequency of the clock oscillator according to the external temperature requires a clock chip to support the adjustable frequency of the oscillator

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