Attila Pasztor, Darryl Veitch, PC Based Precision Timing Without GPS, Sigmetrics, June 2002  Home/Search   Document Details and Download   Summary   Related Articles   Check

..... A high accuracy sender was used capable of sending arbitrary streams of UDP probes. The raw experimental data is the arrival and departure timestamps of the probes. These were collected with a modified tcpdump using a modified software clock with a skew of less than 0. 1 parts per million [11]. Software measurement noise was measured to be significant in just a few measurements per 10000. The accuracy was verified with a hardware based timestamping system described in [12] II. DELAY VARIATION BASED ROUTE DESCRIPTION A. The Governing Equations We begin with some generic definitions ....

....if the mass at the correct value is very small, it can be detected in a high resolution histogram, because its position is very sharply defined. The feasibility of such high resolution is justified by the inherent high speed of networks, provided that the measurement infrastructure is adequate [11], 12] A simulation example is provided in figure 3a. The black histogram is plotted with a bin size of only s, compared to s in grey for the same data. The improvement in signal to noise ratio is dramatic: the peaks are weakly affected, whereas the values in other bins have dropped ....

Attila Pasztor and Darryl Veitch, "PC based precision timing without GPS, " in Proceeding of ACM SIGMETRICS 2002.

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Attila Pasztor, Darryl Veitch, PC Based Precision Timing Without GPS, Sigmetrics, June 2002

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