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Calibration of time and frequency via GPS at The National Laboratory

The National Laboratory for time and frequency offers calibration of time and frequence via GPS.


The National Laboratories have the task to maintain the national references standards for each measurement quantity and to spread metrological competens and traceability to industry and society at large. The national reference standards are the highest level of traceability in Sweden.

A calibration performed at a National Laboratory fullfils all typical traceability and accreditation requirements that commonly exist in industry and society at large. 


For calibration of more accurate time and frequency standards, we offer on-site calibration using the GPS satellite system as an intermediate reference. This requires installation of equipment for reception and storage of data from the GPS. .

The method, known as GPS Common View, is similar to that used by RISE to provide international traceability.

We can also verify and calibrate the time synchronising and positioning performance of different types of GPS and GLONASS receivers. 

The method involves calibrating a frequency standard or clock (DUT) against UTC(SP) by means of simultaneous measurements of GPS satellite signals by both the customer and by RISE.  The use of common satellites eliminates many of the common measurement errors.  In addition, the changes that are observed in the time intervals [UTC(SP) – DUT] provide an estimate of the DUT frequency relative to UTC(SP).

All instrumentation needed (GPS receiver, time interval counter and computer) can be supplied by RISE.


The measured values registered by the customer can be transferred automatically to RISE over the Internet.  Performance calculation is performed automatically by RISE with the results being sent to the customer by (for example) e-mail.  How often this is done is agreed with the customer, but can in principle be done on a daily basis.  The accuracy of frequency measurement, averaged over a day, is better than ±1E-13, but does depend on the quality of DUT.


Order can be sent to, or through the case management in our customer website Calibration

Website Calibration



Calibration of time and frequency via GPS at The National Laboratory

Metrology Area

Time and frequency

Innovation area

Generic metrology and measurement technology

Delivery level

National Measurement Centre

Field measures



Price on tender


Installation of instrumentation is needed.


Kalibrering på RISE

+46 10 516 51 01

Contact person

Kenneth Jaldehag


+46 10 516 54 08

Read more about Kenneth