7 results about "Earth remote sensing" patented technology

The present application relates to the satellite detection technical field of space target, specifically speaking, through the load characteristic, the orbit characteristic of the earth remote sensing satellite and the orbit characteristic of the high orbit target, the high orbit space target detection planning method based on the earth remote sensing satellite is proposed, using this method generates the imaging opportunity, calculates the relative angular velocity of the high orbit space target on the focal plane of the earth remote sensing satellite;And the attitude direction is calculated to carry out high orbit space target observation, both can enhance the brightness of the detection target and realize the detection of the star target, and long arc segment monitoring can be realized to meet the demand of space-based orbit determination to dense measurement, has the wide application scene.

The utility model relates to an optical imaging system, in particular to a visible infrared dual-band refraction and reflection optical system based on a free-form surface shared beam shrinking lens. The technical problem that an existing total reflection type earth remote sensing system and a refraction and reflection type earth remote sensing optical system are difficult to meet the overall requirements of compactness, stray light, convenient adjustment and large view field is solved. The system comprises a beam shrinking unit, a dichroic mirror, a visible TDI imaging lens group, a reflecting mirror, an infrared TDI imaging lens group, a visible switching reflecting mirror and a visible area array imaging lens group, wherein the beam shrinking unit and the dichroic mirror are sequentially arranged along a light path; the visible TDI imaging lens group, the reflecting mirror and the infrared TDI imaging lens group are arranged on a reflecting light path of the dichroic mirror; the visible area array imaging lens group is arranged on a reflecting light path of the visible switching reflecting mirror; the beam shrinking unit comprises a primary mirror, a secondary mirror, an axis folding mirror and a third mirror which are sequentially arranged along a light path; the primary mirror and the secondary mirror are coaxially arranged; the included angle between the normal of the folding-axis mirror and the optical axis of the system is greater than 45 degrees; the third mirror is a free-form surface reflecting mirror, and emergent central view field light of the third mirror is perpendicular to primary and secondary mirror axes; and the dichroic mirror is arranged on an emergent light path of the third mirror.

This invention belongs to the field of low-Earth orbit remote sensing satellite technology and provides a method and system for inter-satellite phase design based on sensor field-of-view matching. The method includes: observation and positioning to obtain the characterization of inter-satellite phase design input variables; calculating the upper and lower limits of the inter-satellite phase difference based on the characterization of the inter-satellite phase design input variables; determining the range of inter-satellite phase difference values; and outputting the phase difference. This invention solves the problem of field-of-view matching during satellite relay, improving the accuracy of relays. It further considers satellite sensor field-of-view matching when satellites have a cooperative relationship, making the problem more targeted to specific scenarios. It is applicable to applications such as Earth remote sensing observation and space debris observation, and is suitable for various sensors, including optical and microwave sensors. It can provide direct guidance for the design of various specific constellation schemes with inter-satellite relay cooperation.

This invention relates to a ground flight control and operation support system for a very low Earth orbit (UEO) satellite constellation. It incorporates predicted space environment information, satellite attitude change information, and orbit control information into the high-precision satellite orbit prediction process, effectively ensuring higher orbit prediction accuracy for the UEO constellation and maximizing the assistance to ground control stations during satellite transits in capturing and tracking the satellite. The satellite attitude and orbit control system simulation module performs real-time simulations of the impact of attitude control and orbit control on orbital maneuvers, thereby achieving higher orbit control accuracy and providing better assurance for the precise execution of missions by the UEO constellation. Automatic scheduling of Earth remote sensing and data transmission tasks, along with ground system fault identification and handling, and collision warning, provide more intelligent support for the operation of the UEO constellation.

The invention discloses an SAR back projection self-focusing imaging method based on a contrast criterion, and relates to the technical field of synthetic aperture radar imaging, and the method comprises the following steps: S1, collecting original echo data, and carrying out the distance compression; s2, obtaining a full-resolution SAR image; s3, constructing a phase error vector; s4, obtaining an optimized phase error vector; s5, obtaining a fitting phase error; and S6, obtaining a high-precision SAR focused image. According to the method, prior information of phase errors does not need to be known, high-frequency, low-frequency and randomly-distributed phase errors existing in SAR echo data can be estimated, the method is suitable for SAR self-focusing imaging under the condition of complex motion trails, the calculation complexity is reduced, and meanwhile the imaging precision is improved. The method can be applied to the fields of synthetic aperture radar imaging, earth remote sensing and the like.

This invention discloses a method for analyzing the uncertainty of full-spectrum hyperspectral Earth remote sensing imaging measurements, comprising the following steps: (1) simulating and calculating the entrance pupil radiance and restored radiance spectral imaging signals of the atmosphere using surface reflectance, surface emissivity, surface temperature, topographic parameters, atmospheric parameters, and imaging system parameters; (2) evaluating the uncertainty of surface reflectance, surface emissivity, and surface temperature; (3) evaluating the uncertainty of topographic parameters per pixel and the correlation coefficient between topographic parameters; (4) evaluating the spectral uncertainty of atmospheric parameters per pixel and the correlation coefficient between atmospheric parameters; (5) constructing an uncertainty propagation model for the radiative transfer link and synthesizing the entrance pupil radiance uncertainty; (6) constructing an uncertainty propagation model for the imaging measurement link and synthesizing the restored radiance uncertainty; (7) analyzing the uncertainty components in the restored radiance and ranking the uncertainty contributions of each link. This invention constructs an uncertainty propagation model for the forward modeling process of hyperspectral remote sensing based on analytical formulas for uncertainty modeling and Monte Carlo distribution propagation. This model can quantify the uncertainty contributions of radiative transfer and imaging measurement, providing technical support for the quantitative application performance analysis and optimization of full-spectrum hyperspectral remote sensing.

The invention relates to the technical field of satellite detection of space targets, in particular to a high-orbit space target detection planning method based on an earth remote sensing satellite through load characteristics and orbit characteristics of the earth remote sensing satellite and orbit characteristics of a high-orbit target. The method is used to generate an imaging opportunity, and the relative angular velocity of a high-orbit space target on a ground remote sensing satellite focal plane is calculated; according to the invention, the brightness of the detected target can be enhanced to realize the detection of targets such as stars, the long arc segment monitoring can be realized to meet the demand of space-based orbit determination for dense measurement, and the method has a wide application scene.