Research On The Key Technology Of Measure & Control HUB For The Instrument On Network (ION)

The main problems existing in traditional instrument for wide-area measure and control application are the absence of an open architecture and measurement information integrity, such as clock synchronization, space consistency and traceability consistency. To solve these problems and realize the wide-area sharing of information resources under an open interconnection of instrument, a solution for the Instrument on Network(ION) is proposed. It is based on the perspective of measurement information integrity and the idea of open architecture. Meanwhile, a nondeterministic data transmission problem appears when using the existing network switching technology to construct the proposed ION. Considering the problems of probe's network access and data's deterministic exchange time in the ION, a"Measure-control HUB(MCHUB)"device unit is designed. It is defined as the border device that has the capability of unified time and deterministic switch delay.Based on the background of ION, this dissertation focuses on the core issue of"time deterministic". The problems included structure and component of the MCHUB, unified time, data deterministic-time exchange, the design, implementation and performance evaluation of MCHUB are studied. The major research efforts include the following aspects.1. Considering the demands of ION, the concept and the characteristic of MCHUB are expounded. Also a deterministic data exchange model is presented. Based on the architecture of ION and the concept of MCHUB, the structure of MCHUB and a constructure design of its components are proposed.2. The unified time internal of MCHUB is researched with respect to benchmark time access, precise time measurement and time transfer.(1) Current existing evaluation methods can not provide the credible discrimination to the periodic time signal and the nonperiodic time signal at the same time. Aiming at the credible discrimination problem for multiple benchmark time signals, an evaluation method based on accurate event-time measurement is proposed. This method realized the simultaneous discrimination of the periodic time signal and the nonperiodic time signal.(2) In order to satisfy the requirement of the accurate measurement of time benchmark signal's arrival events, a precise measurement method based on unified time is carried out. Also an accurate measurement circuit which has the ability of delay's self-calibration within delay unit and continuous real-time measurement is designed.(3) A method of time transfer based on"clock jioned"is proposed for the consideration that errors rise during the time transfer process based on the time synchronization. The proposed method eliminates the errors brought by revised clock in course of synchronization and improves the precision of time transfer.3. To satisfy the deterministic data exchanging demand of MCHUB, the data exchange strategy based on the time pressure and schedule algorithm of largest pressure queue first(LPQF) is proposed according to the analysis of the nondeterministic time of conventional data exchange technology. The schedule algorithm of LPQF including basic principle, mathematical model, algorithm design and realization are comprehensively studied. It is analyzed by network calculus theory. To verify the performance of scheduling algorithm, a emulational software is designed. The simulate results show that LPQF guarantees the certainty of deterministic time's data exchange and hence has better performance than other current algorithms.4. A prototype of MCHUB is designed based on the demand of satellite navigation equipment test system. To evaluate the performance of MCHUB, a series of performance index is concluded. And the test method of performance index is designed. At last, the performance test platform is constructed by multi-DSP's interconnection. The prototype of MCHUB is evaluated by the performance test platform.