89 results about "Earth remote sensing" patented technology

The invention provides an imaging method for a shift-variant mode Bistatic Synthetic Aperture Radar (Bistatic SAR) based on inverse variable metric Fourier transform, and the method aims at the characteristic that the resolution of the shift-variant mode Bistatic Synthetic Aperture Radar (Bistatic SAR) changes by time, and uses variable metric Fourier transform to eliminate the adverse effect brought to the imaging of the Bistatic Synthetic Aperture Radar (Bistatic SAR) by the resolution of the shift-variant mode Bistatic Synthetic Aperture Radar (Bistatic SAR) changing by time, so as to use less calculation to achieve the imaging of the shift-variant mode Bistatic Synthetic Aperture Radar (Bistatic SAR). The method solves the shift-variant mode Bistatic Synthetic Aperture Radar (Bistatic SAR) imaging problem, and is characterized in that the method uses less calculation to achieve the imaging of the shift-variant mode Bistatic Synthetic Aperture Radar (Bistatic SAR). The method can be applied to the fields of Synthetic Aperture Radar ( SAR) imaging, earth remote sensing and the like.

The invention relates to a multi-stage attitude control method for a remote sensing micro-nano satellite, and belongs to the technical field of spacecraft attitude control. A three-axis magnetic moment device and a momentum wheel set are adopted as an attitude control execution component, and the attitude control method for the four main stages of recemization after satellite-rocket separation, counterglow capture, counterglow orientation and counter-earth remote sensing is designed, and an attitude mobile control method for the two stages of counterglow orientation and counter-earth remote sensing is designed. According to the recemization stage, the large angular rate of the satellite obtained after satellite-rocket separation is eliminated, and the basic controlled attitude is built; inthe counterglow capture and counterglow orientation stages, it is ensured that a sun sailboard is in the charging state for a long time; in the counter-earth remote sensing stage, it is ensured thatthe remote sensing photographing task is completed. According to the method, traditional PD control is adopted as the foundation, on the basis of feedforward control, quaternion is used for representing attitude errors, the method has the advantages of being rapid in satellite maneuvering response, high in steady state robustness and high in control precision, and the task requirement for a remotesensing micro-nano satellite is met.

The invention discloses a GPU (graphic processing unit) implementing method based on backward projection InSAR (interfering synthetic aperture radar) imaging registration. The GPU implementing method based on the backward projection InSAR imaging registration comprises the following steps: projecting measured data of different antennae into the same imaging space for imaging by a backward projection algorithm; in the imaging process, performing high-phase-retention imaging and image registration on the different InSAR antennae and realizing integration of InSAR imaging and registration; and in combination of a GPU parallelizing technology, implementing fast processing of the backward projection algorithm. Compared with the conventional InSAR interference phase generation, the GPU implementing method based on the backward projection InSAR imaging registration has the advantages of good phase retention, integration of imaging and registration, improvement on algorithm efficiency through parallelization, and the like; by the GPU implementing method based on the backward projection InSAR imaging registration, quick generation of a high-precision InSAR interference phase is realized; and the GPU implementing method based on the backward projection InSAR imaging registration is applicable to the fields of synthetic aperture radar imaging, geochemical remote sensing and the like.

The invention discloses a compact miniature snapshot spectral imaging detection device and detection method. The device comprises a spectral image replication module and a data acquisition, processing and display system. The spectral image replication module comprises a micro-lens array, linear gradient filters and an area array detector which are arranged along the incident light direction in turn. The linear gradient filters are closely clung to the light sensing surface of the area array detector. The light sensing surface of the area array detector is arranged on the image surface of the micro-lens array and connected with the data acquisition, processing and display system. The arrangement direction of each row of lenses of the micro-lens array and the filtering wave line direction of the same wavelength in the linear gradient filters have an inclined angle. The device is suitable for detecting the spectral image information of a dynamic or fast change target so that the adverse influence caused by target change, jitter noise or environmental change and other factors can be effectively avoided, and the device has potential application value in the field of astronomical observation, space detection, earth remote sensing, machine vision and biomedical diagnosis.

The invention provides a method for constructing a bistatic linear-array three-dimensional synthetic aperture radar system. The method utilizes a principle of a synthetic aperture radar, combines thecharacteristics of high antenna phase center control accuracy in a linear-array three-dimensional synthetic aperture radar and anti-stealth, rich target scattering information and increased radar cross sectional area in the current bistatic synthetic aperture radar system, utilizes the characteristic of combining the bistatic synthetic aperture radar system with a linear-array system, and uses a single-feedback motivational pattern to reduce the power consumption and hardware complexity greatly, overcome a range ambiguity effect and realize three-dimensional imaging of an observed scene. The method realizes three-dimensional imaging of the bistatic linear-array synthetic aperture radar with a small data processing quantity with relatively low hardware cost. The method can be widely appliedin the fields such as synthetic aperture radar imaging, earth remote sensing and geological mapping.

The invention discloses a snapshot type full-polarization imaging detection device, which can be used for acquiring two-dimensional spatial polarization information in real time. The snapshot type full-polarization imaging detection device consists of a front optical lens group, a full-polarization modulation module, an imaging lens group, an area-array detector and a data acquiring and processing system which are arranged in sequence along a light incidence direction. In the snapshot type full-polarization imaging detection device, the full-polarization modulation module consisting of three Wollaston prisms is adopted, the full-polarization information, including respective corresponding two-dimensional spatial images of 0-degree, 90-degree, + / -45-degree, levorotation and dextrorotation circular polarization components, of a detected target at a certain moment and at a certain detection azimuth angle can be obtained by snapshotting one frame of image, and a corresponding two-dimensional spatial graph of all Stokes polarization parameters can be obtained by processing with a simple algebra algorithm. The snapshot type full-polarization imaging detection device has a potential application value in the fields of astronomical observation, space exploration, earth remote sensing, machine vision, biomedical diagnosis and the like.

The invention discloses a space target characteristic measuring and reconnaissance method for micro-nano satellite group approaching reconnaissance. The method comprises a task preparation stage and a task execution stage, the task preparation stage comprises the following steps: taking space target characteristic measurement as a target, combining the maneuvering capability and the load detection capability of a micro-nano satellite, decomposing a working task target and capability requirements of a single satellite, and constructing a satellite group based on the working task target and the capability requirements; the task execution stage comprises migration maneuvering, approaching reconnaissance and the like. According to the invention, an inter-satellite intelligent, cooperative and autonomous working mode demonstration is established, the method can be popularized and applied to the fields using formation / satellite group / constellation, such as on-orbit maintenance, space-based communication and earth remote sensing, and the modes and methods of measurement, control and working of space satellites in the future are greatly changed; space target characteristic measurement is carried out through star group approaching reconnaissance, a task execution work flow is given and serves as a novel data source of target characteristics, in-orbit view angle target characteristic information urgently needed by space application can be provided, the blank of target characteristic information acquisition in related fields is filled in time, and the target characteristic information acquisition efficiency is improved. And the capability of entering the space and utilizing the space is greatly improved.

The invention discloses a microwave staring correlated imaging earth observation method based on coordination of a geostationary satellite and an aerostat platform. The method comprises steps: through a transmitting and receiving-integrated microwave staring correlated imaging system in a geostationary satellite platform, one-time microwave staring correlated imaging is carried out, a large-range low-resolution imaging result of an observation area is obtained, and a key target area is determined; and wide area bistatic and task coordinated-type secondary microwave staring correlated imaging based on the geostationary satellite platform and the aerostat platform for synchronous receiving is used, and a high-resolution imaging result for the key target area is finally obtained. All-day, all-weather, wide-range and low-resolution observation and investigation and small-range hotspot area key target high-resolution microwave staring imaging can be realized, and the method is applicable to earth remote sensing application scenes such as military battlefield investigation and earthquake relief and disaster relief.

The invention provides a linear array three-dimensional imaging synthetic aperture radar rapid imaging method based on multiresolution approach, which aims at the characteristic that an actual linear array three-dimensional imaging synthetic aperture radar echo only contains echoed signals with certain curved signal in a three-dimensional space, and adopts the multiresolution approach technique to carry out imaging processing for a certain curved surface in the three-dimensional space. The invention solves the problem that the calculating amount of a three-dimensional imaging synthetic aperture radar imaging method is large. Compared with the prior three-dimensional imaging synthetic aperture radar imaging calculation, the invention utilizes less calculating amount to realize linear array three-dimensional imaging synthetic aperture radar. The invention can be applied to the fields of synthetic aperture radar image, earth remote sensing, and the like.