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R E A L - T I M E I O N O S P H E R I C C O R R E C T I O N S ( R T I C )
Performance Verified at National Institute of Standards and Technology (NIST)
To characterize the performance gain of the RTIC Option, a Meridian II was sent to NIST in May of
2016, where its 1PPS output was monitored continuously relative to UTC(NIST) for over 30 days.
The RTIC Option was active in the Meridian II during this time. The ionospheric delay corrections
calculated using the broadcast ionospheric model, along with the real-time corrections computed
using the RTIC Option, were logged. With these logs, the NIST timing measurements were post-pro-
cessed to determine what the performance would have been if the RTIC Option had not been active,
and the broadcast model had instead been used.
The following chart shows the difference in stability between the two delay compensation methods
of the Meridian II / RTM3205, along with the stability of the two performance levels of HP 5071
Cesium standards for comparison. The Meridian II / RTM3205 stability performance with the RTIC
option exceeds the standard HP 5071 Cesium at all measurement intervals and exceeds the High
Performance HP 5071 after 300,000 seconds.
Summary of Contents for RTM3205
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