Testing of the methods of real-time MTIE calculation

Abstract

In this paper the experimental tests of the methods enabling real-time quasi-parallel assessment of Maximum Time Interval Error (MTIE) are presented. The idea of real-time quasi-parallel computation of MTIE is introduced first. Then two methods enabling real-time MTIE calculation are described. The results of computation experiments performed using several different data sequences and different computers are included.

Experimental tests of the real-time MTIE assessment methods for multi-channel time error measurement

“…Suspension of the analysis for particular observation interval can be performed in order to protect the measurement and computation process against exceeding the limit of the computation time (length of the sampling interval). Recently measured n max +1 time error samples (τ max =n max τ 0 is the longest observation interval considered) for each channel can be stored in the buffers in the memory in order to reduce the data access time, which is the crucial issue in the real-time computation [6,8]. Therefore all search operations will be performed using the data stored in the tables in the operational memory of the computer, which will reduce the computation time substantially.…”

“…The ability of real-time assessment depends on the several conditions: number and length of the observation intervals considered, number of measurement channels, data structures and organization, computation ability of the equipment, and time error data behavior. Two methods -extreme fix (EF) method [6] and binary decomposition method [4,7] are used in presented test. Effectiveness of EF method depends on nature of data, in opposite to the effectiveness of binary decomposition method which is data independent.…”

“…First solution is based on the time effective MTIE computation method with binary decomposition [4]. Second solution exploits the time effective extreme fix (EF) method [5] successfully applied earlier for single-channel real-time MTIE assessment [6,8,9]. In the paper the results of experimental tests of these methods are presented.…”

Real-time Assessment of Allan Deviation and Time Deviation

“…The methods of real-time ADEV and TDEV computation described above were tested in the calculation experiment, arranged similarly as the real-time MTIE tests [6]. The calculations were performed off-line but the on-line work was imitated.…”

On-line Computation of MTIE using Binary Decomposition and Direct Search with Sequential Data Reducing

“…As result, the MTIE value may be underestimated. Two next methods oriented at the real-time quasi-parallel MTIE assessment, bringing good results regarding time efficiency as well as computation correctness, were described and experimental tested by the authors of this paper in [10]. One of the methods (called direct search with sequential data reducing, DSDR) uses sequential data reduction, as EFSDR method, but the way of reduction (being result of direct search of the extremes) enables to avoid the omitting of significant data.…”