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Appendix D Performance Tests
Complete Performance Tests
D-24 Operating and Programming Guide
Test 3: 1 PPS Time Accuracy (Locked)
This specification is a statistical probability that the Receiver will
conform to the standard as described. This cannot be tested with any
degree of confidence except at NIST or an equivalent National
Standards Laboratory. Actual accuracy obtained depends on the exact
knowledge of the geophysical location, characteristics and delay in the
antenna, calibration of all measurement delays, and calibration of
antenna cable delay. Calibration of both ionospheric and tropospheric
delay use the standard algorithms provided in the GPS data messages.
At the 95% confidence level, time errors associated with the Receiver,
GPS system, and ionospheric and tropospheric effects will be less than
110 ns.
Test 4: 10 MHz Frequency Stability (Time Domain)
and Phase Noise (Frequency Domain) Measurements
NOTE High accuracy precision measurements of both time and frequency
domain stability are available through the National Institute of
Standards and Technology (NIST) in the USA, and at other equivalent
National Standards Laboratories. NIST can completely characterize
and verify all major specifications of the 58503B or 59551A. For
information regarding the various tests available, contact:
National Institute of Standards and Technology,
Measurements Services Office
325 Broadway, Boulder CO 80303-3328 USA,
Telephone: (303) 497-3753
Frequency Stability (Time Domain)
This is an engineering-level measurement requiring a special test
setup. The test setup must be carefully designed to eliminate all
sources of noise. For more information on how to make this
measurement, see Application Note 358-12. Also, see NIST Technical
Note 1337 (available from US Government Printing Office,
Washington DC., USA). This is an excellent theoretical as well as
technical reference for this measurement.
Phase Noise (Frequency Domain)
This measurement requires the HP 3048A Phase Noise Measurement
System or equivalent, a highly specialized test system. In order to
perform properly, this system must contain a reference oscillator with
phase noise characteristics that are equal to or better than the 58503B
or 59551A.
This completes the performance tests.