**6. References**


The prototype circuit unfortunately still has multiply sources of noise and uncertainty. But it is a second plan aspect of circuit optimal design in a future work. The main proof of this prototype circuit is the proof of the possibility for a fast frequency measurement without losses of high resolution and rigorous link to actual situation with frequency jitter in a

In the offered model for fast frequency measurement, the result is fixed on the equality of intervals *n T*0 0 and *n TX X* . Therefore the model is independent to the parameters of coincidence circuits, duration and the shape of coincidence pulses, and the parameters of

Due to jitter effect some theoretically expected marginal coincidences may disappear or nontheoretically expected may appear. However, this phenomenon can not be observed in nonmarginal coincidences, for instance the expected coincidence under condition (30) and an

For measuring systems which can be constructed on the basis of the specified model, systematic and instrumental errors have the same infinitesimal order. Instrumental errors

For measurements of high values of frequency *Xf* it is expedient to use higher values of

Also it is important to note, that this theoretical method permits to measure unknown frequency value in a case, when unknown frequency exceeds the own value of a standard.

In future work, there will be an improved version of the experimental prototype to reduce the influence of deterministic errors in measuring and evaluating new frequency estimators

[1] Stein, S. R. Frequency and Time- Their Measurement and Characterizations. Precision Frequency Control. Vol. 2. Academy Press, New York. 1985. pp 191-416. [2] Johansson, S. New frequency counting principle improves resolution. Proceedings of the

7-9 December 2004, Washington, D.C., ISBN 0-7803-9053-5, 2005 – 628p. [3] Wei Z. The greatest common factor frequency and its application in the accurate

[4] Fletcher, J. C. Frequency measurement by coincidence detection with standard

[5] Tyrsa V.E. Error reduction in conversion of analog quantities to digitized time intervals.

[6] Tyrsa V.E., Dunashev V.V. Accuracy of frequency measurement base on the pulses coincidence principle. Measurement Techniques. Vol. 24, No.43. pp. 308-312. 1981.

Measurement Techniques. Vol 18, No. 3. 1975. pp. 357-360.

36 Annual Precise Time and time interval (PTTI) Systems and Application Meeting,

measurement of periodic signals. Proceedings of the 1992 IEEE Frequency Control

reference frequency in order to have an equivalent reduction of measurement time.

are caused only by the reproducibility of the reference frequency.

For classical methods it is impossible completely.

Symposium, pp. 270-273, 1992.

frequency. U. S. Patent 3, 924,183. 1975.

based on the Theory of Numbers.

**6. References** 

present pulse train.

**5. Conclusions** 

"zero-crossing" pulses in both sequences.

appropriated pulse width τ.


Industrial Electronics (IECON'09), 3-5 November, 2009, Porto, Portugal, pp.3399- 3404. ISBN 978-1-4244-4649-0/09.

