[특허]Method for ambiguity resolution in range-Doppler measurements

[미국특허] Method for ambiguity resolution in range-Doppler measurements 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01S-013/58
출원번호	US-0028091 (1993-02-02)
발명자 / 주소	Heymsfield Gerald M. (Gaithersburg MD) Miller Lee S. (Central SC)
출원인 / 주소	The United States of America as represented by the Administrator of the National Aeronautics and Space Administration (Washington DC 06)
인용정보	피인용 횟수 : 19 인용 특허 : 0

초록 ▼

A method for resolving range and doppler target ambiguities when the target has substantial range or has a high relative velocity in which a first signal is generated and a second signal is also generated which is coherent with the first signal but at a slightly different frequency such that there exists a difference in frequency between these two signals of Dt. The first and second signals are converted into a dual-frequency pulsed signal, amplified, and the dual-frequency pulsed signal is transmitted towards a target. A reflected dual-frequency signal is received from the target, amplified, and changed to an intermediate dual-frequency signal. The intermediate dual-frequency signal is amplified, with extracting of a shifted difference frequency Dr from the amplified intermediate dual-frequency signal done by a non-linear detector. The final step is generating two quadrature signals from the difference frequency Dt and the shifted difference frequency Dr and processing the two quadrature signals to determine range and doppler information of the target.

대표청구항 ▼

A device for resolving range and doppler target ambiguities when either the device or the target has substantial range or velocity comprising: means for generating a first signal; means for generating a second signal which is coherent with said first signal but at a slightly different frequency such that there exits a difference in frequency between these two signals of Dt; means for modulating said first and second signals such that said first and second signals are converted into a dual-frequency pulsed signal; means for amplifying said dual-frequency pulsed signal; antenna means for transmitting said dual-frequency pulsed signal towards said target; means for receiving a reflected dual-frequency signal from said target; means for amplifying said reflected dual-frequency signal; means for producing an intermediate dual-frequency signal from said amplified reflected dual-frequency signal; means for amplifying said intermediate dual-frequency signal; means for extracting a shifted difference frequency Dr from said amplified intermediate dual-frequency signal; detector means for generating two quadrature signals from said difference frequency Dt and said shifted difference frequency Dr; and means for processing said two quadrature signals to determine range and doppler information of said target.

이 특허를 인용한 특허 (19) 인용/피인용 타임라인 분석

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Abatzoglou Theagenis John ; Huang Chao ; Steakley Bruce ; Kenneth Jung, Fast maximum likelihood processor for means wind velocity estimation.
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Kyrazis, Demos T., Fixed difference, dual beam laser Doppler velocimetry.
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McEwan Thomas E., Impulse radar with swept range gate.
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Coleman, Aaron; Hanoch, Jeffrey W.; Maguire, Brian, Linear and circular downscan imaging sonar.
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Pearlman,Jay S.; Tillotson,Brian J., Measuring wind vectors remotely using airborne radar.
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Tillotson, Brian J., Method and apparatus for making airborne radar horizon measurements to measure atmospheric refractivity profiles.
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Kroeger, Jens; Mende, Ralph; Schumann, Karsten, Method for pulse width modulation of a radar system.
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Rousseau, Pascal, Multicolored range-finder.
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McEwan Thomas E., Short range micro-power impulse radar with high resolution swept range gate with damped transmit and receive cavities.
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Coleman, Aaron Richard, Sonar assembly for reduced interference.
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Coleman, Aaron; Hanoch, Jeffrey W.; Maguire, Brian, Sonar imaging techniques for objects in an underwater environment.
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Brown, Kevin; Coleman, Aaron, Sonar rendering systems and associated methods.
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Brown, Kevin; Coleman, Aaron, Sonar rendering systems and associated methods.
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Proctor, Alan, Sonar system using frequency bursts.
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Proctor, Alan, Sonar system using frequency bursts.
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Lauenstein, Michael, Systems and associated methods for producing sonar image overlay.
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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] Method for ambiguity resolution in range-Doppler measurements 원문보기