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| Tape preparation system |
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Method and device for excess modulation detection for signal analysis
| Details |
Inventors: Meyers, Clifford W.; Biele, Steven A.; Schwartz, George R.;
Assignee: Hughes Aircraft Company (Los Angeles, CA)
Primary Examiner: Teska; Kevin J.
Assistant Examiner:
Attorney, Agent or Firm: Alkov; Leonard A., Denson-Low; Wanda K.
An automated process and device for testing both C.W. and swept output signal modulation of a system or unit under test. The invention conditions the output signals to be compatible for measurement, measures incremental cycle periods of the signals using a continuous time counter, converts raw signal data into formatted tables, calculates prescribed parameters relating to the signals, aligns the calculated prescribed parameters relating to the signals, computes incremental signal frequencies from the incremental cycle periods as measured, substarts the incremental signal frequencies from the predicted signal frequencies to form a frequency residual model, constructs a curve using the incremental signal frequencies, and displays the curve. A prediction model is created and used to predict expected results. The prediction model defines ideal behavior of both C.W. and swept signals from a unit under test. The ideal behavior data is subtracted from the actual data, leaving a coarse representation of non-linearities. A combination of digital filtering, least squares curve fitting and the Choelsky method for solving simultaneous equations is used to refine coarse data into a frequency vs. time continuous curve or for other uses by the unit under test. The invention can be used for integrated circuit testing in manufacturing and incoming inspection of all types of fixed oscillators, all types of voltage controlled oscillators, and amplitude modulation and frequency modulation heterodyning chips, and instrument and module testing for manufacturing, incoming inspection, field test and diagnostics for function generators, sweep generators, oscillators and synthesizers. |
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DETAILED DESCRIPTION The present invention seeks to overcome deficiencies in the prior art by providing an automated process and device for testing both C.
W.
and swept output signal modulation of a system or unit under test.
An advantage of the present invention is to provide an improved method and apparatus which employs an automated digital signal processing method so that the subjectivity of human operator intervention is eliminated and accuracy of results are not governed by the skill level of the operator.
Another advantage of the present invention is to provide rapid testing of both C.
W.
and swept signal modulation for devices or units under test; this will eliminate the requirement to wait a lengthy period of time until the test system warms up and stabilizes for operation.
Yet another advantage of the present invention is to decrease the size and weight of test systems as compared to existing test systems.
A further advantage is to provide a process for signal analysis for both C.
W.
and swept signals at a much lower cost.
The hereabove-stated advantages of the present invention satisfy current market requirements in the art.
Some applications for the present invention include integrated circuit testing in manufacturing and incoming inspection for all types of fixed oscillators, all types of voltage controlled oscillators, and amplitude modulation and frequency modulation heterodyning chips; and instrument and module testing for manufacturing, incoming inspection, field test and diagnostics for function generators, sweep generators, oscillators and synthesizers.
Additional specific applications include radar and electronics testing for voltage control oscillators, reference oscillators, and signal demodulation; communications and navigations systems for digital FM demodulators, reference oscillators for carrier signals, and carrier signal drift and stability control.
For particular airborne radar system applications, the technique of the present invention provides accurate hardware calibration to permit the measurement of distance (range) for fast moving airborne targets; the Frequency Modulated Range (FMR) techniques rely on swept radio frequency (RF) signals with highly linear sweeps (1 part in 33,000,000)
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