Method and apparatus for measuring phase accuracy and amplitude

Details Method and apparatus for measuring phase accuracy and amplitude Method and apparatus for measuring phase accuracy and amplitude

1989-01-13

1991-03-19

Olms, Douglas W.

Pulse or digital communications

Repeaters

Testing

329304, 375118, 455226, H04B 1700, H04L 7033

Patent

active

050017241

ABSTRACT:
A method and apparatus for determining the phase and amplitude accuracy of continuous-phase-modulated signals is described. A modulated RF signal generated by a transmitter is down converted to a relatively low intermediate frequency which is filtered and sampled by a high sampling rate analog-to-digital convertor. A digital signal processor processes the digital signals to produce a measured amplitude function and a measured phase function corresponding to the modulated RF signal. From the measured amplitude and phase functions, an ideal phase function corresponding to the modulated RF signal is calculated and synthesized. The ideal phase function is compared to the measured phase function to determine the phase function from which the modulated RF signal phase error and frequency error are computed.

REFERENCES:
patent: 4027250 (1977-05-01), Lang
patent: 4513428 (1985-04-01), Roeder
patent: 4514855 (1985-04-01), Lang et al.

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