Crystal oscillation frequency correction method and device

Abstract

The invention relates to a crystal oscillator oscillation frequency correction method and a crystal oscillator oscillation frequency correction device. The method comprises the steps of receiving a first communication frame from sending equipment, and recording a moment T2 for receiving the first communication frame; sending a first reply frame to the sending equipment according to the first communication frame, and recording a moment T3 for sending the first reply frame; receiving a second communication frame sent by the sending equipment in response to the first reply frame, and recording a moment T6 for receiving the second communication frame; acquiring a moment T1 for sending the first communication frame, a moment T4 for receiving the first reply frame, and a moment T5 for sending the second communication frame sent by the sending equipment via the second communication frame; determining a frequency difference between the receiving equipment and the sending equipment according to the moment T1, the moment T2, the moment T3, the moment T4, the moment T5 and the moment T6; and adjusting oscillation frequency of a crystal oscillator according to the frequency difference. According to the crystal oscillator oscillation frequency correction method provided by the embodiment of the invention, real-time correction on oscillation frequency of the crystal oscillator can be achieved, a correction algorithm can be simplified, and correction accuracy can be improved.

Description

technical field [0001] The present disclosure relates to the field of communication technology, and in particular to a method and device for correcting the oscillation frequency of a crystal oscillator. Background technique [0002] At present, most of China's coal mine personnel positioning systems use RFID (Radio Frequency Identification, radio frequency identification technology), ZigBee short-range wireless communication technology, WiFi wireless field strength technology and SDS-TWR (Symmetrical Double-sided Two-Way Ranging, symmetrical two-way bilateral ranging ) and other technologies to locate coal mine personnel. [0003] Due to the high ranging accuracy of the above-mentioned SDS-TWR technology, the SDS-TWR technology is widely used in the positioning system. However, in the process of using SDS-TWR technology for ranging, the relative frequency difference between hardware devices (sending device and receiving device) will reduce the sensitivity of the receiving d...

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Problems solved by technology

[0005] However, the above solution needs to be carried out in the laboratory, and the field equipment needs to be moved to the laboratory; the laboratory environment is different from the field, resulting in the laboratory calibration results may not be directly applied to the engineering site; even if the laboratory can simulate the engineering site environment, due to frequency adjustment After the completion, it will take a certain amount of time to install the equipment on site. As time goes by, the frequency of the crystal oscillator will drift

Therefore, the above-mentioned technical solution is complicated to operate, and the calibration results cannot be applied in the field

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