公开(公告)号：US10922960B2

公开(公告)日：2021-02-16

申请号：US16803292

申请日：2020-02-27

Applicant: Kamstrup A/S

Inventor： Jeppe Hofni ,  Jens Pedersen ,  Tommy Bechsgaard

IPC: G08C17/02 ,  G06F13/42 ,  G01D4/00 ,  H04Q9/04

Abstract: A radio communication device comprising a radio frequency circuit and a microcontroller arranged to control the radio frequency circuit. The radio communication device further comprises: a radio frequency reference connected to the radio frequency circuit and arranged to be the frequency reference of at least the symbol frequency; a MCU and a time frequency reference connected to the microcontroller. The microcontroller is arranged to determine a frequency error of the time frequency reference relative to the radio frequency reference by performing the steps of: transmitting a radio signal, and signal a timing signal on a control interface, comprising information on start of transmission and end of transmission of the radio signal; receive the timing signal from the radio frequency circuit and measure a transmission duration of the radio signal with reference to the MCU frequency reference and calculate a frequency error of the MCU frequency reference relative to the radio frequency reference based on the measured transmission duration of the radio signal and the number of symbols and the symbol frequency. Further, the microcontroller measures a time period of the time frequency reference with reference to the MCU frequency reference; and calculate the frequency error of the time frequency reference relative to the radio frequency reference.

公开(公告)号：US20200279476A1

公开(公告)日：2020-09-03

申请号：US16803292

申请日：2020-02-27

Applicant: Kamstrup A/S

Inventor： Jeppe Hofni ,  Jens Pedersen ,  Tommy Bechsgaard

IPC: G08C17/02 ,  G06F13/42

Abstract: A radio communication device comprising a radio frequency circuit and a microcontroller arranged to control the radio frequency circuit. The radio communication device further comprises: a radio frequency reference connected to the radio frequency circuit and arranged to be the frequency reference of at least the symbol frequency; a MCU and a time frequency reference connected to the microcontroller. The microcontroller is arranged to determine a frequency error of the time frequency reference relative to the radio frequency reference by performing the steps of: transmitting a radio signal, and signal a timing signal on a control interface, comprising information on start of transmission and end of transmission of the radio signal; receive the timing signal from the radio frequency circuit and measure a transmission duration of the radio signal with reference to the MCU frequency reference and calculate a frequency error of the MCU frequency reference relative to the radio frequency reference based on the measured transmission duration of the radio signal and the number of symbols and the symbol frequency. Further, the microcontroller measures a time period of the time frequency reference with reference to the MCU frequency reference; and calculate the frequency error of the time frequency reference relative to the radio frequency reference.