Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By presence or absence pulse detection
Patent
1992-09-11
1995-01-17
Wolfe, Willis R.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By presence or absence pulse detection
327 72, 327284, H03K 5153
Patent
active
053828488
ABSTRACT:
A time of arrival detector for an analog pulse signal digitizes the pulse, digitally delays the digitized signal in one path and converts the delayed signal back to a delayed analog version of the input signal. In a second path an undelayed analog version of the input signal is provided. A scaling offset is established to scale the delayed signal larger than the undelayed signal, and the delayed and undelayed signals are then compared to establish a time of arrival for the input pulse. A delta modulator is preferably used to provide the digitized signal, and also to provide the undelayed analog version of the input signal as the smoothed output of an integrator within the delta modulator. The undelayed modulator output is preferably attenuated by -3 dB, with the pulse's time of arrival obtained from the time at which the delayed analog signal rises above the undelayed but attenuated signal. The time of arrival of the pulse's trailing edge is obtained in a similar manner by scaling the undelayed signal larger than the delayed signal, and comparing the two resulting signals to detect when the undelayed signal falls below the delayed signal. The pulse width can then be determined by subtracting the pulse's time of arrival from its time of termination.
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Burns Lawrence M.
Tso Robert
Denson-Low W. K.
Grunebach Georgann S.
Gudmestad Terje
Hughes Aircraft Company
Wolfe Willis R.
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