초록 ▼

A disciplined oscillator system having a standard oscillator which is automatically corrected for both frequency errors and time error accumulation to a constant frequency signal which is derived from the WWVB carrier frequency and the WWVB TIME CODE to maintain overall frequency accuracy within one

A disciplined oscillator system having a standard oscillator which is automatically corrected for both frequency errors and time error accumulation to a constant frequency signal which is derived from the WWVB carrier frequency and the WWVB TIME CODE to maintain overall frequency accuracy within one part in 109 notwithstanding oscillator aging and in spite of jitter and distortion due to propagation delays and noise which may cause loss of, or time jitter in, the WWVB signals. Frequency errors are detected through the use of a counter (24) having a measurement accuracy greater than one part in 1010. An error detector (26) derives correction signals by averaging a plurality of frequency variances obtained in successive measurement cycles. Timing errors are corrected by dividers (34, 40) controlled by a timing discriminator (36) which responds to timing variance between signals from the standard oscillator and from the WWVB reference which are phase locked to those TIME CODE signals which are substantially free of noise and jitter. The timing correction is inhibited after the standard oscillator is corrected. Frequency correction is applied continuously.

대표청구항 ▼

In a disciplined oscillator system utilizing a source of pulses repetitive at fixed intervals of time and having standard oscillator means having a standard frequency output which is variable in frequency in response to a control signal, time controller means comprising means responsive to said stan

In a disciplined oscillator system utilizing a source of pulses repetitive at fixed intervals of time and having standard oscillator means having a standard frequency output which is variable in frequency in response to a control signal, time controller means comprising means responsive to said standard frequency output and said fixed interval pulses for providing a train of reference pulses time-locked to said fixed interval pulses, and means responsive to the phase difference between said fixed interval pulses and said reference pulses for producing said control signal.