Clock test apparatus for electronic device

Details Clock test apparatus for electronic device Clock test apparatus for electronic device

1991-06-10

1992-10-06

Issing, Gregory C.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

324 78R, 331 44, 4552261, H04B 7185, H04B 1700, G01R 2302, G01R 2300

Patent

active

051535998

ABSTRACT:
A clock test apparatus connected to a GPS receiver mounted in a moving body has a frequency counter which counts clocks output from a clock generator incorporated in the GPS receiver for a predetermined period of time. In this manner, a clock frequency is detected and supplied to a clock error identification section. The clock error identification section calculates a short-term stability from the clock frequency, and further calculates a clock error on the basis of the short-term stability. The clock error data is supplied to a dynamics simulator. The dynamics simulator simulates circuit dynamics of the GPS receiver, and models error in the velocity of the moving body relative to a satellite, which results from the clock error, on the basis of the clock error data, thereby analyzing the performance of the GPS receiver.

REFERENCES:
patent: 4150432 (1979-04-01), Sorden
patent: 4345206 (1982-08-01), Skalka
patent: 4843328 (1989-06-01), Greenhall
Shields, "Review of the Specification and Measurement of Short Term Stability" Microwave Jnl, Jun. 1969 pp. 49-55.
Characteristics of Frequency Stability, IEEE IM-20, No. 2, May 1971, pp. 105-120, James A. Barnes, et al.

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