METHOD FOR OPERATING A COMMUNICATION SYSTEM AND COMMUNICATION SYSTEM

• US 20140169414A1
• Filed: 07/13/2012
• Published: 06/19/2014
• Est. Priority Date: 07/21/2011
• Status: Abandoned Application

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Moen, Stian Skorstad
• Application Number:
  US14/233,875
• Publication Number:
  US 20140169414A1
• Time in Patent Office: Days
• US Class Current: 375/218
• CPC Class Codes: H03K 5/135 by the use of time reference signals, e.g. clock signals
• CPC Class Codes: H03L 7/06 using a reference signal applied to a frequency- or phase-locked loop
• CPC Class Codes: H04B 13/02 Transmission systems in which the medium consists of the earth or a large mass of water thereon, e.g. earth telegraphy
• CPC Class Codes: H04J 3/0658 Clock or time synchronisation among packet nodes
• CPC Class Codes: H04L 7/033 using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop
• CPC Class Codes: H04L 7/04 Speed or phase control by synchronisation signals H04L7/0075 takes precedence

Abstract

A method for operating a communication system including a first device with a working oscillator and a second device with a reference oscillator is provided. The method includes calibrating the working oscillator of the first device connected to an asynchronous serial communications bus. The calibrating includes defining a measurement time, and measuring and selecting a predefined pulse space of a first signal. The predefined pulse space of the first signal is formed by a plurality of predefined discrete pulse spaces, generated by a second device including a reference oscillator, and received by the first device during the measurement time over the asynchronous serial communications bus.

Claims

1. A subsea communication system comprising:

a pressurized environment comprising a first device, the first device including a working oscillator and a calibration unit;

an atmospheric canister comprising a second device, the second device including a reference oscillator; and

an asynchronous serial communications bus connecting the first device and the second device,

wherein the calibration unit is configured to calibrate the working oscillator using a pulse space of a signal transmittable from the second device over the asynchronous serial communications bus.

2. The subsea communication system of claim 1, wherein the reference oscillator is a crystal oscillator, in particular a quartz oscillator.

3. The subsea communication system of claim 1, wherein the reference oscillator is a ceramic oscillator.

4. The subsea communication system of claim 1, wherein the asynchronous serial communications bus is a CAN-bus.

8. The method for operating the subsea communication system of claim 1, further comprising validating the calibration of the working oscillator of the first device.

9. The method for operating the subsea communication system of claim 8, wherein validating the calibration of the working oscillator of the first device comprises periodically sending predefined signals from the second device over the asynchronous serial communications bus.

10. The method for operating the subsea communication system of claim 9, wherein calibrating comprises measuring a length of the predefined signal by the first device.

11. The method for operating the subsea communication system of claim 9, wherein the first signal, the predefined signal, or the first signal and the predefined signal are a CAN-bus signal.

16. The subsea communication system of claim 1, wherein the pressurized environment comprises a fluid filled container.

17. The subsea communication system of claim 2, wherein the reference oscillator comprises a quartz oscillator.

5. A method for operating a subsea communication system, the subsea communication system comprising a pressurized environment, the pressurized environment comprising a first device, the first device including a working oscillator and a calibration unit, the subsea communication system further comprising an atmospheric canister comprising a second device, the second device including a reference oscillator, the subsea communication system further comprising an asynchronous serial communications bus connecting the first device and the second device, the method comprising:

calibrating the working oscillator of the first device connected to the asynchronous serial communications bus, the calibrating comprising;

defining a measurement time; and

measuring and selecting a predefined pulse space of a first signal formed by a plurality of predefined discrete pulse spaces, generated by a second device comprising a reference oscillator, and received by the first device during the measurement time over said asynchronous serial communications bus.

6. The method for operating the subsea communication system of claim 5, further comprising adjusting a frequency of the working oscillator.

7. The method for operating the subsea communication system of claim 5, further comprising adapting a calculation of an operating bit rate of the first device.

12. The method for operating the subsea communication system of claim 5, further comprising operating the first device in a pressurized environment.

13. The method for operating the subsea communication system of claim 5, further comprising:

determining from the measured and selected predefined pulse space a frequency deviation between the reference oscillator and the working oscillator; and

calibrating the working oscillator in accordance with the determined frequency deviation.

14. A program element, the program element comprising instructions, when executed by a data processer, being for operating a subsea communication system, the subsea communication system comprising a pressurized environment, the pressurized environment comprising a first device, the first device including a working oscillator and a calibration unit, the subsea communication system further comprising an atmospheric canister comprising a second device, the second device including a reference oscillator, the subsea communication system further comprising an asynchronous serial communications bus connecting the first device and the second device, the instructions comprising:

calibrating the working oscillator of the first device connected to the asynchronous serial communications bus, the calibrating comprising;

defining a measurement time; and

measuring and selecting a predefined pulse space of a first signal formed by a plurality of predefined discrete pulse spaces, generated by a second device comprising a reference oscillator, and received by the first device during the measurement time over said asynchronous serial communications bus.

15. (canceled)