Indian Remote Sensing (IRS) programme started in 1970s and has grown very systematically in all aspects of sensors, data products and applications for resources survey. Imaging systems onboard IRS-1C satellite, flown in 1995, made a remarkable impact by providing on a single platform, the ability to simultaneously image in multiple spectral channels, multiple geometric resolutions and multiple revisit times in addition to stereo viewing. This development of three-tier imaging system of IRS-1C had been a giant leap in Indian space imaging systems evolution. It required development of compact high-resolution sensor, medium-resolution multispectral system and wide swath imager. This review article brings out the innovative solutions adopted, some of the major challenges faced and new technologies developed. In addition, it briefly provides the foundational research that was carried out in sensors prior to IRS-1C and the improvements carried out in spacecraft systems to cater to the requirements of imaging. The development of IRS-1C made significant impact on the development of subsequent imaging systems, and these aspects are discussed in terms of growth of three-tier imaging, high-resolution systems, etc.

中文翻译：

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记住 IRS-1C 成像有效载荷：印度空间成像系统发展的巨大飞跃

印度遥感 (IRS) 计划始于 1970 年代，并在传感器、数据产品和资源调查应用的各个方面非常系统地发展。1995 年发射的 IRS-1C 卫星上的成像系统产生了显着影响，它在单个平台上提供了在多个光谱通道、多个几何分辨率和多个重访次数中同时成像的能力以及立体观看。IRS-1C三层成像系统的发展是印度空间成像系统发展的一次巨大飞跃。它需要开发紧凑型高分辨率传感器、中分辨率多光谱系统和宽幅成像仪。这篇评论文章介绍了所采用的创新解决方案、面临的一些主要挑战和开发的新技术。此外，它简要介绍了在 IRS-1C 之前在传感器中进行的基础研究以及在航天器系统中进行的改进以满足成像要求。IRS-1C的发展对后续成像系统的发展产生了重大影响，这些方面从三层成像、高分辨率系统等方面的发展进行了讨论。