[특허]Three dimensional interferometric synthetic aperture radar terrain mapping with unambiguous phase unwrapping employing s

[미국특허] Three dimensional interferometric synthetic aperture radar terrain mapping with unambiguous phase unwrapping employing s 원문보기

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국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01S-013/90
출원번호	US-0867341 (1992-04-13)
발명자 / 주소	Auterman James L. (Ann Arbor MI)
출원인 / 주소	Environmental Research Institute of Michigan (Ann Arbor MI 02)
인용정보	피인용 횟수 : 37 인용 특허 : 0

초록 ▼

Synthetic aperture radar data is used to produce a terrain map. Two synthetic radar antennas are placed on an aircraft, which moves in a set of substantially parallel flight paths. At least one antenna repeatedly transmits radar signals whose return echoes are received by both the antennas. The echo signals are processed conventionally to yield slant range and Doppler frequency data for plural resolution cells. The measured phase difference for each resolution cell provides an ambiguous measure of slant range difference to the two antennas needed to determine terrain elevation and correct ground range. As in the prior art, the radar transmissions employ an extended bandwidth of wavelengths. The received echo data is reprocessed using less than the entire bandwidth of the radar transmission to achieve additional center wavelengths. This produces a differing ambiguity interval and permits unambiguous determination of the slant range difference.

대표청구항 ▼

A terrain mapping apparatus used with a moving platform having an axis of motion, said apparatus comprising: a position detector disposed on the moving platform for repeatedly detecting the position of the moving platform; a first radar antenna disposed on the moving platform having a predetermined field of view off the axis of motion of the moving platform; a second radar antenna disposed on the moving platform a predetermined distance from said first radar antenna having said predetermined field of view, said first and second radar antennas forming an interferometer baseline substantially perpendicular to the axis of motion; a transmitter disposed on the moving platform and connected to at least one of said first and second antennas for repeatedly transmitting a radar signal having a predetermined bandwidth via said at least one of said first and second antennas; a first complex image formation apparatus connected to said first antenna for forming first synthetic aperture complex image data for plural resolution cells in slant range and Doppler frequency from reflections of said predetermined bandwidth received by said first antenna employing plural transmitted radar signals; a second complex image formation apparatus connected to said second antenna for forming second synthetic aperture complex image data for plural resolution cells in slant range and Doppler frequency from reflections of said predetermined bandwidth received by said second antenna employing plural transmitted radar signals; a first phase detector connected to said first and second complex image formation apparatuses for determining the phase angle difference between said complex image data of said first and second complex image formation apparatuses for each resolution cell thereby producing a first phase difference signal; a third complex image formation apparatus connected to said first antenna for forming third synthetic aperture complex image data for plural resolution cells in slant range and Doppler frequency from reflections of a first subset of said predetermined bandwidth received by said first antenna employing plural transmitted radar signals; a fourth complex image formation apparatus connected to said second antenna for forming second synthetic aperture complex image data for plural resolution cells in slant range and Doppler frequency from reflections of said first subset of said predetermined bandwidth received by said second antenna employing plural transmitted radar signals; a second phase detector connected to said third and fourth complex image formation apparatuses for determining the phase angle difference between said complex image data of said third and fourth complex image formation apparatuses for each resolution cell thereby producing a second phase difference signal; a phase disambiguity circuit connected to said first and second phase detectors for resolving circular ambiguities in said first phase difference signal employing said second phase difference signal thereby forming a circular ambiguity resolved phase difference signal; and a terrain map formation means connected to said position detector, said first complex image formation apparatus and said phase disambiguity circuit for computing the elevation and ground range for each resolution cell within said first synthetic aperture complex image data for each of said set of platform paths employing the detected position of the moving platform and said circular ambiguity resolved phase difference signal for each resolution cell.

이 특허를 인용한 특허 (37) 인용/피인용 타임라인 분석

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van der Kooij Marco Willem Antonie,CAX, Method for iterative disk masking and automatic error repair for phase unwrapping.
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Normant Eric,FRX, Method for the processing of the reception signal of a deramp type synthetic aperture radar.
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Obenshain, Kenneth Fell, Method of synthesizing topographic data.
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Lars Ulander SE, Method to generate a three-dimensional image of a ground area using a SAR radar.
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Hager, James R.; Heidemann, Thomas W.; Jicha, Thomas R., Methods and apparatus for determination of a filter center frequency.
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Burlet,Todd R.; Kude,Tika M.; Oven,James B.; Reilly,Timothy J., Methods and systems for identifying high-quality phase angle measurements in an interferometric radar system.
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Thomas,Steven H.; Almsted,Larry D., Methods and systems for interferometric cross track phase calibration.
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Forgrieve,Andrew; Freedman,Tim B.; Noll,John M., Methods and systems for producing an interpretive airborne radar map.
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Dwyer J. Craig ; Arnold ; Jr. C. L. ; Parker Kenneth W., Minimum-gradient-path phase unwrapping.
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Henson,James M.; Kohlmoos,Ross P., Multi-dimensional real-array radar antennas and systems steered and focused using fast fourier transforms.
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Nguyen, Lam Huy; Sichina, Jeffrey, Multidirectional target detecting system and method.
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Poehler Paul L. ; Mansfield Arthur W., Phase gradient auto-focus for SAR images.
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Robert H. Goebel ; Stacie K. Corrubia, Precision all-weather target location system.
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Corrubia Stacie K. ; Fogle Dale A. ; Goebel Robert H., Precision height measuring device.
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James R. Hager ; Curtis J. Petrich ; Larry D. Almsted, Precision radar altimeter with terrain feature coordinate location capability.
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Andersson, Lars-Gunnar; Hellsten, Hans, Radar system and method for a synthetic aperture radar.
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Goebel, Robert H.; Toretta, David C.; Corrubia, Stacie K., Synthetic aperture, interferometric, down-looking, imaging, radar system.
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Pritt Mark D., System for topographic mapping from remotely sensed images.
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Poehler Paul L. ; Mansfield Arthur W., Terrain elevation measurement by interferometric synthetic aperture radar (IFSAR).
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Martinez, Ana; Doerry, Armin W.; Bickel, Douglas L., Two antenna, two pass interferometric synthetic aperture radar.
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[미국특허] Three dimensional interferometric synthetic aperture radar terrain mapping with unambiguous phase unwrapping employing s 원문보기

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[미국특허] Three dimensional interferometric synthetic aperture radar terrain mapping with unambiguous phase unwrapping employing s 원문보기

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