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公开(公告)号：US11570375B2
公开(公告)日：2023-01-31
申请号：US17638203
申请日：2020-07-16
发明人： Xiaoxiang Zhang , Xin Gao , Xiyu Li
摘要： A space debris observation method based on alternating exposure times of a charge coupled device (CCD) camera is provided. The present disclosure controls the CCD camera to acquire consecutively and alternately short-exposure and long-exposure images based on preset exposure times. The present disclosure realizes detection and astronomical positioning of low-orbit, medium-orbit and high-orbit space debris by processing short-exposure images of odd-numbered frames. The present disclosure realizes detection of medium-orbit and high-orbit space debris by processing long-exposure images of even-numbered frames, and realizes astronomical positioning of the medium-orbit and high-orbit space debris detected in a current frame through plate constant model coefficients of adjacent odd-numbered frames. In addition, in a search mode, the present disclosure realizes precise astronomical positioning of low-orbit, medium-orbit and high-orbit space debris through a multi-point adjustment method and the plate constant model coefficients of adjacent odd-numbered frames.
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2.发明申请公开(公告)号：US20220100926A1
公开(公告)日：2022-03-31
申请号：US17435405
申请日：2020-07-16
发明人： Jin XU , Jianbo MA , Jianli DU , Zhibin CAO , Dong YANG
IPC分类号： G06F30/20 , G06F119/14 , G06F111/10
摘要： A method for constructing a free trajectory of a ballistic missile at a specified launch angle includes: setting of an initial state of iterations: based on geodetic coordinates of a launch point and a target point, a launch epoch and the specified launch angle, assuming that the earth does not rotate and a flight time is zero; generating a new flight time in a two-body force model by using known quantities and obtained auxiliary quantities; taking a difference between flight times obtained before and after the iterations as a condition for judging convergence; outputting designed parameters of the ballistic missile after the convergence is reached, or performing a differential correction including the J2 perturbation to improve the precision of the trajectory constructed, and taking a position error of the target point as a convergence condition of the differential correction.
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3.发明申请公开(公告)号：US20220091277A1
公开(公告)日：2022-03-24
申请号：US17435404
申请日：2020-07-16
发明人： Jin XU , Zhijun DAI
摘要： A method for accurately and efficiently calculating a dense ephemeris of a high-eccentricity orbit is provided. With respect to the ephemeris calculation of the high-eccentricity orbit, the method constructs uneven interpolation nodes through time transformation and interpolates by an interpolation polynomial based on uneven interpolation nodes to obtain a dense ephemeris, which significantly improves the calculation efficiency and accuracy. Based on a large-scale numerical experiment, the method derives an optimal universal value (that is, 0.3) of a transformation parameter for all orbital eccentricities and various interpolation polynomials. In the case of using the optimal universal value of the transformation parameter δ, the method further verifies the Hermite interpolation polynomial as the preferable one among various interpolation polynomials.
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4.发明授权公开(公告)号：US11319094B2
公开(公告)日：2022-05-03
申请号：US17435404
申请日：2020-07-16
发明人： Jin Xu , Zhijun Dai
摘要： A method for accurately and efficiently calculating a dense ephemeris of a high-eccentricity orbit is provided. With respect to the ephemeris calculation of the high-eccentricity orbit, the method constructs uneven interpolation nodes through time transformation and interpolates by an interpolation polynomial based on uneven interpolation nodes to obtain a dense ephemeris, which significantly improves the calculation efficiency and accuracy. Based on a large-scale numerical experiment, the method derives an optimal universal value (that is, 0.3) of a transformation parameter for all orbital eccentricities and various interpolation polynomials. In the case of using the optimal universal value of the transformation parameter δ, the method further verifies the Hermite interpolation polynomial as the preferable one among various interpolation polynomials.
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5.发明申请公开(公告)号：US20210266073A1
公开(公告)日：2021-08-26
申请号：US17263163
申请日：2020-07-16
发明人： Yuan REN , Shengcai SHI , Daixi ZHANG
IPC分类号： H04B10/61
摘要： A grating- and fiber-coupled multi-beam coherent receiving system in a mid- and far-infrared band includes a mid- and far-infrared local oscillator signal source, a phase grating, a multi-beam fiber coupling system, a 2×2 pixel mid- and far-infrared superconducting HEB mixer, a multi-channel DC bias source, a multi-channel cryogenic low-noise amplifier, and a room-temperature intermediate-frequency and high-resolution spectrum processing unit. In a 2×2 multi-beam superconducting receiving system, an echelle grating and a cryogenic optical fiber are used to distribute and couple the local oscillator signal, and the mid- and far-infrared band high-sensitivity superconducting HEB mixer is used to realize efficient local oscillator signal distribution and coupling, and ultimately achieve high-sensitivity and high-resolution multi-beam spectrum reception in the mid- and far-infrared band.
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公开(公告)号：US20220345610A1
公开(公告)日：2022-10-27
申请号：US17638203
申请日：2020-07-16
发明人： Xiaoxiang ZHANG , Xin GAO , Xiyu LI
摘要： A space debris observation method based on alternating exposure times of a charge coupled device (CCD) camera is provided. The present disclosure controls the CCD camera to acquire consecutively and alternately short-exposure and long-exposure images based on preset exposure times. The present disclosure realizes detection and astronomical positioning of low-orbit, medium-orbit and high-orbit space debris by processing short-exposure images of odd-numbered frames. The present disclosure realizes detection of medium-orbit and high-orbit space debris by processing long-exposure images of even-numbered frames, and realizes astronomical positioning of the medium-orbit and high-orbit space debris detected in a current frame through plate constant model coefficients of adjacent odd-numbered frames. In addition, in a search mode, the present disclosure realizes precise astronomical positioning of low-orbit, medium-orbit and high-orbit space debris through a multi-point adjustment method and the plate constant model coefficients of adjacent odd-numbered frames.
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7.发明授权公开(公告)号：US11159246B2
公开(公告)日：2021-10-26
申请号：US17263163
申请日：2020-07-16
发明人： Yuan Ren , Shengcai Shi , Daixi Zhang
IPC分类号： H04B10/61
摘要： A grating- and fiber-coupled multi-beam coherent receiving system in a mid- and far-infrared band includes a mid- and far-infrared local oscillator signal source, a phase grating, a multi-beam fiber coupling system, a 2×2 pixel mid- and far-infrared superconducting HEB mixer, a multi-channel DC bias source, a multi-channel cryogenic low-noise amplifier, and a room-temperature intermediate-frequency and high-resolution spectrum processing unit. In a 2×2 multi-beam superconducting receiving system, an echelle grating and a cryogenic optical fiber are used to distribute and couple the local oscillator signal, and the mid- and far-infrared band high-sensitivity superconducting HEB mixer is used to realize efficient local oscillator signal distribution and coupling, and ultimately achieve high-sensitivity and high-resolution multi-beam spectrum reception in the mid- and far-infrared band.
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