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This Month's Feature Article Keeping the Lights On Engineers rebuilding lower Manhattan's power supply grid after 9/11 devised a GPS-clocked intermesh solution to bring new substations online. The process measured power sine waves, and developed software to link GPS to the electrical distribution system — shortening a 72-hour operation to four hours, without service interruption. The method accurately measures any two low-frequency sine waves and compares them remotely for phase-angle displacement and voltage magnitude difference in real time. Correction Leap Second Not Added An article in the Global View section of the November issue of GPS World incorrectly stated that a leap second would be inserted into Coordinated Universal Time (UTC) on November 27, 2003. This will, in fact, not occur. The potential receiver anomaly described in the article, if it occurred, would arise from firmware coding in a particular receiver and not from a change in the UTC. The mistake in the article stemmed from an editorial error and not from either of the sources cited, the GPS Joint Program Office and Innovation column editor Richard Langley.
Approximate Word count = 601
Approximate Pages = 2.4
(250 words per page double spaced)
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