TTE network clock calibration method and system

Abstract

The invention provides a TTE network clock calibration method and system. The TTE network clock calibration system comprises a coarse synchronization subsystem and a fine synchronization subsystem, the coarse synchronization subsystem comprises a synchronization word detection module, a phase synchronization detection module and a coarse synchronization delay modulation module; the fine synchronization subsystem comprises an LMS adaptive filter training module, a coefficient storage module, a drift compensation model module and a fine synchronization delay processing module. A traditional taming crystal oscillator system adopts an analog or semi-digital system and has the defects of high cost, great influence of environmental factors, difficulty in debugging, difficulty in model establishment and the like. According to the time frequency basic principle of the taming crystal oscillator technology, the full-digital taming crystal oscillator system based on the clock model construction technology is designed aiming at the defects of the traditional taming crystal oscillator technology, the system can improve the time difference measurement precision, an advanced crystal oscillator noise model is utilized, analysis and debugging are convenient, and the time difference measurement precision is improved. The tracking capability and the holding capability are better than those of a traditional method.

Description

technical field [0001] The invention belongs to the technical field of communication, relates to a TTE network, in particular to a TTE network clock calibration method and system. Background technique [0002] For control systems, propagation delays cause control delays, which are equivalent to phase lags and can degrade system performance. In a deterministic control system, in order to ensure the timely effectiveness of control and solve the problem of uncertain delay, a deterministic control network must be used to ensure that the message transmission time is determined, which has become an important issue in safety-critical systems. The SAE AS6802 synchronization protocol adopted by the time-triggered network TTE is to establish a network time synchronization mechanism in a definite delay environment, and establish a deterministic control delay on the basis of standard Ethernet to ensure that control commands can arrive at the specified time and ensure timely and effectiv...

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Problems solved by technology

Phase synchronization is mentioned in AS6802. Although satisfactory synchronization results can be achieved, when it is applied to avionics networks that require extremely high synchronization accuracy, it is necessary to reduce the time interval of the integration cycle, starting at the beginning of each integration cycle Executing the AS6802 synchronization mechanism is equivalent to increasing the sending frequency of synchronous PCF frames, which will inevitably increase the number of PCF frames in the network, thereby reducing the effective performance of the entire avionics network bandwidth

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