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Search Publications by: Michael A. Lombardi (Assoc)

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Displaying 76 - 100 of 141

Time Coordination Throughout the Americas via the SIM Common-View GPS Network

December 5, 2006
Author(s)
Michael A. Lombardi, Andrew N. Novick, Jose M. Lopez, Jean-Simon Boulanger, Carlos Donado
The Sistema Interamericano de Metrologia (SIM) consists of national metrology institutes (NMIs) located in all 34 member nations of the Organization of American States (OAS), which extends throughout North, Central, and South America, and the Caribbean

Remote Time Calibrations via the NIST Measurement and Analysis Service

December 1, 2006
Author(s)
Michael A. Lombardi, Andrew N. Novick
NIST now offers a new remmote calibration service desinged to assist laboratories who maintain an accurate local time standard. The service monitors the local time standard by continuously comparing it to the national time standard, and reports the

Remote Time Calibrations via the NIST Time Measurement and Analysis Service

December 1, 2006
Author(s)
Michael A. Lombardi, Andrew N. Novick
NIST now offers a new remote calibration service designed to assist laboratories who maintain a accurate local time standard. The service monitors the local time standard by continuously comparing it to the national time standard, and reports the

SIM Time and Frequency Comparison Network in Near Real Time

October 25, 2006
Author(s)
Jose M. Lopez, Michael A. Lombardi, Andrew N. Novick, Jean-Simon Boulanger, Raymond Pelletier, Carlos Donado
A network for time and frequency comparisons within the Inter-American Metrology System (SIM) has been developed. The SIM time and frequency network uses the common-view Global Positioning System (GPS) method to compare frequency and time standards

Comparing LORAN Timing Capability to Industrial Requirements

October 23, 2006
Author(s)
Michael A. Lombardi
The telecommunications and electric power industries both operate systems that depend upon precise time synchronization or frequency control. These systems typically use signals from the Global Positioning System (GPS) satellites as their timing source

Legal and Technical Measurement Requirements for Time and Frequency

September 1, 2006
Author(s)
Michael A. Lombardi
This paper discusses various technologies and applications that rely on precise time and frequency, and explores their legal and technical requirements for measurement uncertainty. The technologies and applications discussed include financial markets, the

The NIST Time Measurement and Analysis Service

August 7, 2006
Author(s)
Michael A. Lombardi, Andrew N. Novick
NIST now offers a new remote calibration service designed to assist laboratories who maintain a accurate local time standard. The service monitors the local time standard by continuously comparing it to the national time standard, and reports the

Time Signal Stations

July 1, 2006
Author(s)
Michael A. Lombardi
A review article that looks at the history of time signal stations, beginning with the first radio experiments in the 1890's and continuing to the present day. It discusses both shortwave time signal stations, best known for their voice announcements of

The Role of LORAN Timing in Telecommunications

May 8, 2006
Author(s)
Michael A. Lombardi, Chuck Norman, William J. Walsh
The telecommunications industry in the United States has performance requirements for time synchronization and frequency control that must be met in order for land and mobile telephone services, wireless networks, and other applications to remain

Radio Controlled Wristwatches

May 1, 2006
Author(s)
Michael A. Lombardi
A review article that briefly summarizes the various types of radio controlled wristwatches and the technology behind them. It includes a short description of NIST radio station WWVB, and other signal sources used to synchronize radio controlled

Legal and Technical Requirements for Time and Frequency Metrology

March 2, 2006
Author(s)
Michael A. Lombardi
Who needs time and frequency? This paper answers that question by discussing the technologies and applications that rely on precise time and frequency, and exploring their legal and technical requirements for measurement uncertainty. The technologies and

The Inter-American Metrology System (SIM) Common-View GPS Comparison Network

August 29, 2005
Author(s)
Michael A. Lombardi, Andrew N. Novick, Jose M. Lopez, Jean-Simon Boulanger, Raymond Pelletier
The Inter-American Metrology System (SIM) consists of national metrology institutes in 34 member nations located throughout North, Central, and South America. Currently, at least ten SIM laboratories pursue time and frequency metrology, and are responsible

The GOES Time Code Service, 1974 - 2004: A Retrospective

February 27, 2005
Author(s)
Michael A. Lombardi, D. W. Hanson
After nearly 30 years of continuous operation, NIST ended its Geostationary Operational Environmental Satellites (GOES) time code service at 0 hours, 0 minutes Coordinated Universal Time (UTC) on January 1, 2005. This event marked the end of an important

NIST time and frequency radio stations: WWV, WWVH, and WWVB

January 1, 2005
Author(s)
Glenn Nelson, Michael A. Lombardi, Windell Oskay
The National Institute of Standards and Technology (NIST) provides standard time and frequency information through three radio broadcast stations that are routinely used by millions of customers. The stations, WWV and WWVB, located in Fort Collins