This paper presents an efficient image matching technique with translation, subpixel translation. Fast Fourier transform technique is the most powerful area-based technique that involves translation, rotation and othe...
详细信息
NISAR, NASA-ISRO Synthetic Aperture RADAR, is a unique SAR interferrometric mission, that uses sweep SAR and digital beam forming technology, will be planned to fly early next year. Being an interferrometric mission s...
详细信息
ISBN:
(数字)9798350390346
ISBN:
(纸本)9798350390353
NISAR, NASA-ISRO Synthetic Aperture RADAR, is a unique SAR interferrometric mission, that uses sweep SAR and digital beam forming technology, will be planned to fly early next year. Being an interferrometric mission surface deformation studies are one of the prime objectives of this mission. For precision deformation map generation NISAR is planned to fly in a diamond shaped orbital corridor. The repeat pass orbits of NISAR, that are 12 days apart, are to have state vectors within a predefined diamond shape in orbital plane. NISAR’s orbits are maintained within a diamond shape orbital corridor with 325 m in vertical (normal-track) and 250 m in horizontal (cross-track) directions. This article presents a novel approach for NISAR’s diamond orbit accuracy evaluation and validation. We plan to estimate and validate the normal-track (NT), cross-track (CT) and alongtrack (AT) components of the baseline for repeat pass orbits of NISAR. Our approach uses image pairs along with ancillary information and orbit-attitude-time information (OATs) for the estimation of baseline components.
This article presents an efficient novel approach estimating residual attitude based on geometrically corrected (GEO) satellite images. A technique is presented that uses orbital plane geometry to compute the rotation...
详细信息
A circuit technique is proposed to reduce the capacitance spread of high-Q switched-capacitor (SC) filters, without increasing the sensitivity or requiring higher DC amplifier gain. The proposed SC integrator attenuat...
详细信息
A circuit technique is proposed to reduce the capacitance spread of high-Q switched-capacitor (SC) filters, without increasing the sensitivity or requiring higher DC amplifier gain. The proposed SC integrator attenuates the input during both clock phases, so that the time constant of the integrator is realized with the product of two capacitance ratios instead of a single capacitance ratio. The capacitance spread then only increases as the square root of the time constant. The integrator is stray-insensitive. The enhancement of amplifier offset due to the proposed integrator is often negligible if the total offset of the entire SC filter is considered. A lowpass notch SC biquad is presented as an example to show the capacitance advantage of the integrator. In the numerical example, the new SC lowpass notch biquad reduces the total capacitance by a factor of more than three.< >
暂无评论