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公开(公告)号：US20220260725A1
公开(公告)日：2022-08-18
申请号：US17178540
申请日：2021-02-18
Applicant: Raytheon Company
Inventor： Stephen J. Schiller
Abstract: An apparatus and method of intersensor calibration including using a zero airmass response constant proportional to sensor absolute radiometric gain coefficients to monitor sensor radiometric stability. Tracking the ratio of zero airmass response constant values for similar bands between two sensors provides a parameter on a common radiometric scale for evaluating interoperability performance. The method includes imaging a solar signal using a mirror to create an image reference target, detecting the image reference target using a first sensor, generating a zero airmass response constant based on a ground sampling distance of the first sensor and an at-sensor radiance value, computing a radiometric gain coefficient of the first sensor using the zero airmass response constant, and comparing the radiometric gain coefficient of the first sensor to a radiometric gain coefficient of a second sensor to determine a gain ratio between the first sensor and second sensor.
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公开(公告)号：US20220214246A1
公开(公告)日：2022-07-07
申请号：US17612102
申请日：2019-05-22
Applicant: Raytheon Company
Inventor： Stephen J. Schiller
Abstract: A system (100) and method can monitor a reflectance of a mirror target that includes at least one curved mirror (M). The system (100) can take a first irradiance measurement of the sun (S), the first irradiance measurement representing a direct solar irradiance. The system (100) can take a second irradiance measurement that represents an irradiance from a reflection of the sun (S) from the mirror target plus background irradiance from a reflection of the sky from the mirror target. The system (100) can take a third irradiance measurement that represents the background irradiance from the reflection of the sky from the mirror target. The system (100) can determine a reflectance of the mirror target from the first, second, and third irradiance measurements. The system (100) can compare the reflectance to a specified reflectance threshold, and, upon determining that the reflectance of the mirror target is less than the specified reflectance threshold, can generate an alert signal.
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公开(公告)号：US20220094834A1
公开(公告)日：2022-03-24
申请号：US17024901
申请日：2020-09-18
Applicant: Raytheon Company
Inventor： Stephen J. Schiller
Abstract: An example method includes recording dark images on an image sensor on-board an orbital vehicle during flight, which include a first image recorded before the orbital vehicle is over a predefined location on the Earth and a second image recorded after the orbital vehicle is over the predefined location; and recording third and fourth images on the image sensor during flight based on illumination from a light source that is on-board, with the third image being recorded before the orbital vehicle is over the predefined location and the fourth image being recorded after the orbital vehicle is over the predefined location. A fifth image is recorded on the image sensor during flight while the predefined location on the Earth is visible to the image sensor. The fifth image is based on light from a ground-based calibration system. The light source is calibrated during flight based on the five images.
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Patent Agency Ranking
公开(公告)号：US11879838B2
公开(公告)日：2024-01-23
申请号：US17228966
申请日：2021-04-13
Applicant: RAYTHEON COMPANY
Inventor： Randall W. Zywicki , Stephen J. Schiller
IPC: G06T7/80 , G01N21/3577 , G02B5/18 , G01J3/28 , G01N21/17
CPC classification number: G01N21/3577 , G01J3/2803 , G01J3/2823 , G02B5/1861 , G06T7/80 , G01N2021/1793 , G06T2207/10032
Abstract: A method for vicarious spatial characterization of a remote sensor system. The method includes detecting, via the remote sensor system, radiation reflected from at least one body of water corresponding to a plurality of point reflector images, selecting a set of point reflector images from the plurality of point reflector images, the selected set of point reflector images corresponding to sub-pixel point reflector images, analyzing the selected set of point reflector images by executing an algorithm for fitting the point reflector images to obtain a point spread function of the remote sensor system, and determining a spatial characteristic of the remote sensor system based on the point spread function.
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公开(公告)号：US11619746B2
公开(公告)日：2023-04-04
申请号：US17178540
申请日：2021-02-18
Applicant: Raytheon Company
Inventor： Stephen J. Schiller
Abstract: An apparatus and method of intersensor calibration including using a zero airmass response constant proportional to sensor absolute radiometric gain coefficients to monitor sensor radiometric stability. Tracking the ratio of zero airmass response constant values for similar bands between two sensors provides a parameter on a common radiometric scale for evaluating interoperability performance. The method includes imaging a solar signal using a mirror to create an image reference target, detecting the image reference target using a first sensor, generating a zero airmass response constant based on a ground sampling distance of the first sensor and an at-sensor radiance value, computing a radiometric gain coefficient of the first sensor using the zero airmass response constant, and comparing the radiometric gain coefficient of the first sensor to a radiometric gain coefficient of a second sensor to determine a gain ratio between the first sensor and second sensor.
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公开(公告)号：US11297255B1
公开(公告)日：2022-04-05
申请号：US17024901
申请日：2020-09-18
Applicant: Raytheon Company
Inventor： Stephen J. Schiller
Abstract: An example method includes recording dark images on an image sensor on-board an orbital vehicle during flight, which include a first image recorded before the orbital vehicle is over a predefined location on the Earth and a second image recorded after the orbital vehicle is over the predefined location; and recording third and fourth images on the image sensor during flight based on illumination from a light source that is on-board, with the third image being recorded before the orbital vehicle is over the predefined location and the fourth image being recorded after the orbital vehicle is over the predefined location. A fifth image is recorded on the image sensor during flight while the predefined location on the Earth is visible to the image sensor. The fifth image is based on light from a ground-based calibration system. The light source is calibrated during flight based on the five images.
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公开(公告)号：US10692178B2
公开(公告)日：2020-06-23
申请号：US16281977
申请日：2019-02-21
Applicant: Raytheon Company
Inventor： Stephen J. Schiller
Abstract: In an optical system, a color filter mosaic can determine first color pixel locations, second color pixel locations, and third color pixel locations in an array of sensor pixels. The optical system can capture overhead images, which can be subtracted to form a background-subtracted tri-color image of a reflection of sunlight from at least one ground-based curved mirror. A processor can scale color values at the first and second color pixel locations of the tri-color background-subtracted image. The processor can form a single-color background-subtracted image from the scaled color values at the first color pixel locations, the scaled color values at the second color pixel locations, and third color values at the third color pixel locations. The single-color background-subtracted image can correspond to a point spread function or a line spread function of the optical system.
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公开(公告)号：US20140055785A1
公开(公告)日：2014-02-27
申请号：US13671048
申请日：2012-11-07
Applicant: RAYTHEON COMPANY
Inventor： John F. Silny , Stephen J. Schiller
IPC: G01J4/00
CPC classification number: G01J4/00
Abstract: Described are methods and systems for vicarious polarimetric calibration and performance validation of a remote sensor. The system includes a plurality of reflective mirrors configured and arranged to reflect radiation from a source of radiation onto the remote sensor with accurately known polarimetric properties. Each of the reflective mirrors are located so that the target images do not overlap. The remote sensor is configured to receive the radiation reflected from the plurality of reflective mirrors and store the received radiation as image data (e.g., the image of each mirror appears as a point target). The system includes a processor configured to process the received data to provide direct calibration and performance validation for each polarimetric or spectral channel of the remote sensor. In addition, the calibration method removes all atmospheric effects except for transmittance and provides reference targets that have high polarimetric contrast, full spectrum performance and easy to deploy.
Abstract translation: 描述了用于远程传感器的替代偏振校准和性能验证的方法和系统。 该系统包括多个反射镜，其被配置和布置为将来自辐射源的辐射以精确已知的偏振特性反射到远程传感器上。 每个反射镜被定位成使得目标图像不重叠。 远程传感器被配置为接收从多个反射镜反射的辐射并将接收到的辐射存储为图像数据（例如，每个镜的图像显示为点目标）。 该系统包括处理器，其被配置为处理接收到的数据以对远程传感器的每个偏振或频谱通道提供直接校准和性能验证。 此外，校准方法除去透射率以外的所有大气效应，并提供具有高极化对比度，全光谱性能和易于部署的参考目标。
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