[특허]Highly accurate zero crossings for frequency determination

[미국특허] Highly accurate zero crossings for frequency determination 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01S-005/02
출원번호	US-0085389 (1993-07-01)
발명자 / 주소	Tsui David C. (Centerville OH) Tsui James B. Y. (Dayton OH) Hedge James N. (Medway OH)
출원인 / 주소	The United States of America as represented by the Secretary of the Air Force (Washington DC 06)
인용정보	피인용 횟수 : 21 인용 특허 : 0

초록 ▼

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.

대표청구항 ▼

Apparatus for measuring frequency of an incoming signal using antenna means coupled to a frequency measurement receiver; said frequency measurement receiver comprising input means coupling input signals from the antenna means to a single analog-to-digital converter operated at a sampling frequency which is at least four times the frequency of the input signals to provide real data comprising a set of digitized samples at points where y represents the digitized value of the amplitude, the time between samples being designated as Dy0=A sin (wt1+ay1=A sin [wt1+D)+ay2=A sin [wt1+2Dt)+aw2pf is the angular frequency, and a1 following one of said samples as follows: [Figure] where [Figure] [Figure] means for calculating successive zero crossings as above, counting the number of zero crossings and then computing a value for the frequency of the input signals using the relationship: [Figure] where n=number of zero crossings time difference=distance between crossings.

이 특허를 인용한 특허 (21) 인용/피인용 타임라인 분석

Fu,Dengwei; Torosyan,Arthur; Willson, Jr.,Alan N., Apparatus and method for angle rotation.
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Fu, Dengwei; Willson, Jr., Alan N., Apparatus and method for rectangular-to-polar conversion.
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Fu, Dengwei; Willson, Jr., Alan N., Apparatus and method for trigonometric interpolation.
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James B. Jones ; Ruy C. Brandao ; Ruy L. Brandao ; Rand Ringwald, Cable phase calibration in a TCAS.
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O'Shea, Timothy James; McGwier, Robert W.; McCarthy, Nicholas Aaron, Determining emitter locations.
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O'Shea, Timothy James; McGwier, Robert W.; McCarthy, Nicholas Aaron, Determining emitter locations.
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Hung Chung-wen,TWX ; Chen Lin-chieh,TWX ; Chen Yung-fa,TWX, Device for sensing the period of a digitized signal including noise evaluation and averaging over a plurality of zero cr.
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Owen William P. ; Sheets Judd, Frequency counter with reduced false correlations.
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Bi, Mi Michael; Kiew, Peter Kwong Ming; Ng, Chin Hon, Method and apparatus for measuring the instantaneous frequency of FM signals.
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Mi Michael Bi SG; Ming Kwong Peter Kiew AU; Chin Hon Ng SG, Method and apparatus for measuring the instantaneous frequency of FM signals.
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Greene Elliott J. ; Lo Pei-Hwa, Method for measuring RF pulse rise time, fall time and pulse width.
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Walters, Marlin E.; Sorenson, Marius W.; Finlayson, Malcolm F.; Lee, Robin J.; Cummins, Clark H., Molecular melt and methods for making and using the molecular melt.
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Walters,Marlin E.; Sorenson,Marius W.; Finlayson,Malcolm F.; Lee,Robin J.; Cummins,Clark H., Molecular melt and methods for making and using the molecular melt.
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Walters,Marlin E.; Sorenson,Marius W.; Finlayson,Malcolm F.; Lee,Robin J.; Cummins,Clark H., Molecular melt and methods for making and using the molecular melt.
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Walters,Marlin E.; Sorenson,Marius W.; Finlayson,Malcolm F.; Lee,Robin J.; Cummins,Clark H., Molecular melt and methods for making and using the molecular melt.
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Tau, Li-Min; Van Volkenburgh, William R.; Hoenig, Wendy D.; Chum, Pak-Wing S., Polyethylene rich/polypropylene blends and their uses.
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Ansems, Patricia; Silvis, H. Craig; Madenjian, Lisa S., Polyolefin composition with improved impact properties.
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Patricia Ansems ; H. Craig Silvis ; Lisa S. Madenjian, Polyolefin composition with improved impact properties.
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Thoen, Johan A.; Cheung, Chuiwah A.; Chaudhary, Bharat I., Propylene copolymer foams.
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Johnson,J. Andrew, System and method for determining the location of emitters having well-behaved timing features.
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LaWhite Niels, System for determining fundamental frequency of an AC signal.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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[미국특허] Highly accurate zero crossings for frequency determination 원문보기