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公开(公告)号：US09103918B2
公开(公告)日：2015-08-11
申请号：US13688543
申请日：2012-11-29
Applicant: RAYTHEON COMPANY
Inventor： Theagenis J. Abatzoglou , Johan E. Gonzalez , Joel K. McWilliams , Raymond Samaniego , Mark B. Yeary , Enrique A. Santiago
Abstract: A synthetic aperture radar imaging method that combines each radar return pulse with a sinusoid to reduce the radar return pulses to a baseband frequency and deskew each radar return pulse. It includes determining a maximum likelihood estimate (MLE) of residual motion parameters for a dominant scatterer on the ground relative to the airborne radar and correcting for errors in inertial navigation system measurements based on the MLE residual motion parameters. It includes convolving each radar return pulse with its corresponding radar transmission pulse to generate a range compressed image for each radar return pulse and generating a sub-band range profile image for each radar return pulse and its corresponding radar transmission pulse based on the corresponding range compressed image that has been corrected for residual motion. Performing bandwidth extrapolation on each sub-band and subsequently combining the three bands to produce an enhanced resolution image without grating lobes.
Abstract translation: 一种合成孔径雷达成像方法，将每个雷达返回脉冲与正弦波相结合，以将雷达返回脉冲降低到基带频率，并对每个雷达返回脉冲进行去偏移。 它包括确定相对于机载雷达的地面上主要散射体的残余运动参数的最大似然估计（MLE），并且基于MLE残余运动参数校正惯性导航系统测量中的误差。 它包括将每个雷达返回脉冲及其相应的雷达传输脉冲进行卷积，以产生每个雷达返回脉冲的范围压缩图像，并根据对应的压缩范围生成每个雷达返回脉冲及其对应的雷达传输脉冲的子带范围轮廓图像 残留运动已被校正的图像。 在每个子带上执行带宽外推，随后组合三个频带以产生不带光栅的增强分辨率图像。
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公开(公告)号：US10181862B1
公开(公告)日：2019-01-15
申请号：US15879024
申请日：2018-01-24
Applicant: RAYTHEON COMPANY
Inventor： Harry B. Marr , Daniel Thompson , Mark B. Yeary
Abstract: A delta-sigma modulator (DSM) includes: a first summation circuit coupled to an input signal for subtracting an error feedback signal from the input signal; a tunable signal transfer function coupled to the first summation circuit for setting a desired pole in a frequency response of the DSM; a second summation circuit coupled to the tunable signal transfer function for adding a noise transfer function to an output of the tunable signal transfer function; and a quantizer coupled to the second summation circuit for quantizing an output of the second summation circuit to generate an output of the DSM. The output of the DSM is used as feedback to the first summation circuit as the error feedback signal, and the tunable signal transfer function is dynamically tuned to allow selecting and tuning a center frequency and a bandwidth of the DSM.
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公开(公告)号：US20140218231A1
公开(公告)日：2014-08-07
申请号：US13688543
申请日：2012-11-29
Applicant: Raytheon Company
Inventor： Theagenis J. Abatzoglou , Johan E. Gonzalez , Joel K. McWilliams , Raymond Samaniego , Mark B. Yeary , Enrique A. Santiago
Abstract: A synthetic aperture radar imaging method that combines each radar return pulse with a sinusoid to reduce the radar return pulses to a baseband frequency and deskew each radar return pulse. It includes determining a maximum likelihood estimate (MLE) of residual motion parameters for a dominant scatterer on the ground relative to the airborne radar and correcting for errors in inertial navigation system measurements based on the MLE residual motion parameters. It includes convolving each radar return pulse with its corresponding radar transmission pulse to generate a range compressed image for each radar return pulse and generating a sub-band range profile image for each radar return pulse and its corresponding radar transmission pulse based on the corresponding range compressed image that has been corrected for residual motion. Performing bandwidth extrapolation on each sub-band and subsequently combining the three bands to produce an enhanced resolution image without grating lobes.
Abstract translation: 一种合成孔径雷达成像方法，将每个雷达返回脉冲与正弦波相结合，以将雷达返回脉冲降低到基带频率，并对每个雷达返回脉冲进行去偏移。 它包括确定相对于机载雷达的地面上主要散射体的残余运动参数的最大似然估计（MLE），并且基于MLE残余运动参数校正惯性导航系统测量中的误差。 它包括将每个雷达返回脉冲及其相应的雷达传输脉冲进行卷积，以产生每个雷达返回脉冲的范围压缩图像，并根据对应的压缩范围生成每个雷达返回脉冲及其对应的雷达传输脉冲的子带范围轮廓图像 残留运动已被校正的图像。 在每个子带上执行带宽外推，随后组合三个频带以产生不带光栅的增强分辨率图像。
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