Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1993-07-01
1994-12-13
Wieder, Kenneth A.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 7658, 324 7624, 324 7682, 342442, 342147, 364577, 364723, G01S 502
Patent
active
053732367
ABSTRACT:
The technique to measure the frequency very accurately for electronic warfare (EW) applications, and is simple in hardware, and which can accomplish this goal with a signal with real data (in contrast to complex data). It uses trigonometric identities to compute the location of the zero, which is very precise, but requires the use of an inverse trigonometric function. From these crossings, one can find the frequency very accurately using only one channel of data. The input signal is down converted and digitized with one A/D converter. The digitized data is used to find the zero crossing. The resolution of the zero crossing is limited by the clock cycle. Three uniformly digitized points around a zero crossing are used to find the time for the crossing. The device according to the invention will calculate the frequency very accurately using only one channel of data.
This method can be used to measure the angle of arrival in a two antenna configuration with very precise results where the distance between the two antennas does not exceed half the wavelength of the incoming signal.
REFERENCES:
patent: 4006348 (1977-02-01), Ochiai
patent: 4639733 (1987-01-01), King
patent: 4644268 (1987-02-01), Malka
patent: 4982165 (1991-01-01), Lowenschuss
patent: 5198822 (1993-03-01), Brown
patent: 5285209 (1994-02-01), Sharpin
Hedge James N.
Tsui David C.
Tsui James B. Y.
Franz Bernard E.
Kundert Thomas L.
Solis Jose M.
The United States of America as represented by the Secretary of
Wieder Kenneth A.
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