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<p>Oceansat series of sun-synchronous polar satellites is envisaged to provide data with multi-spectral capability and a wide swath for oceanographic applications. Oceansat-3 (EOS-06) mission, launched by ISRO in November 2022, aims to maintain the continuity of services provided by Oceansat-2 while offering enhanced payload specifications and expanded application areas. Ocean Colour Monitor-3 (OCM-3) is one of the payloads onboard the Oceansat-3 satellite. OCM-3, which is an improvement over OCM-1/2, has thirteen bands in the spectral range of 402–1030&#xa0;nm. The ground resolution is 366&#xa0;m at nadir, with a swath width of 1590&#xa0;km, from a satellite altitude of 732&#xa0;km. A single-EOM based configuration with modular wide-field optics and a frame-transfer CCD detector for each band has been considered for the realization of the OCM-3 payload. To meet the high SNR requirements, external Time Delay and Integration (TDI) technique is employed. There are two imaging modes in the payload—Local Area Coverage (LAC) mode and Global Area Coverage (GAC) mode. The payload is operated in a tilted condition of either + 20° or − 20° through a payload steering mechanism to avoid sun-glint. The instrument is configured to meet the system requirements of a large swath, with a telecentric optical design to preserve the spectral content and electro-optical performance in terms of Modulation Transfer Function (MTF), Band to Band Registration (BBR), and Signal to Noise Ratio (SNR) over a temperature range of 20 ± 5&#xa0;°C. The integrated flight hardware has been extensively characterized in the lab as well as in thermo-vacuum conditions. The payload meets all the geometric and radiometric performance parameters as per the mission goals. BBR of ≤ ± 1 pixel is achieved across the entire field of view. SWR is measured to be ≥ 20% for all the bands. SNR at ocean reference radiance is estimated to be between 920 and 1570 in LAC mode and between&#xa0;780&#xa0;and&#xa0;2750 in GAC mode, showing a significant improvement over OCM-1/2 payload. Post-launch performance is evaluated w.r.t. SNR and BBR after applying various corrections and has been found to be meeting the specifications with adequate margins. This paper provides an overview of the design, results of the on-ground characterization and the post-launch performance of the OCM-3 payload flown onboard the&#xa0;Oceansat-3 (EOS-06) mission. </p>

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An Overview of the Design and Realized Performance of Ocean Colour Monitor (OCM-3) Payload On-Board the Oceansat-3 (EOS-06) Mission

  • 期刊论文

  • 发表日期：

    2025年6月22日

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  • Vishnukumar D. Patel,
  • Manoj Kumar,
  • Pradeep Soni,
  • Rahul Dev,
  • Dheeraj Adlakha,
  • Moumita Dutta,
  • Dhrupesh S. Shah,
  • Manoj P. Detroja,
  • Harish Seth,
  • Ashok Kumar,
  • Jimit Gadhia,
  • P. Nandha Kumar,
  • Shivadev Rao Shinde,
  • Sahil Patel,
  • Rahul Kumar,
  • Hiren Rambhia,
  • Ranjan Parnami,
  • Ankur Garg,
  • Somya S. Sarkar

摘要

Oceansat series of sun-synchronous polar satellites is envisaged to provide data with multi-spectral capability and a wide swath for oceanographic applications. Oceansat-3 (EOS-06) mission, launched by ISRO in November 2022, aims to maintain the continuity of services provided by Oceansat-2 while offering enhanced payload specifications and expanded application areas. Ocean Colour Monitor-3 (OCM-3) is one of the payloads onboard the Oceansat-3 satellite. OCM-3, which is an improvement over OCM-1/2, has thirteen bands in the spectral range of 402–1030 nm. The ground resolution is 366 m at nadir, with a swath width of 1590 km, from a satellite altitude of 732 km. A single-EOM based configuration with modular wide-field optics and a frame-transfer CCD detector for each band has been considered for the realization of the OCM-3 payload. To meet the high SNR requirements, external Time Delay and Integration (TDI) technique is employed. There are two imaging modes in the payload—Local Area Coverage (LAC) mode and Global Area Coverage (GAC) mode. The payload is operated in a tilted condition of either + 20° or − 20° through a payload steering mechanism to avoid sun-glint. The instrument is configured to meet the system requirements of a large swath, with a telecentric optical design to preserve the spectral content and electro-optical performance in terms of Modulation Transfer Function (MTF), Band to Band Registration (BBR), and Signal to Noise Ratio (SNR) over a temperature range of 20 ± 5 °C. The integrated flight hardware has been extensively characterized in the lab as well as in thermo-vacuum conditions. The payload meets all the geometric and radiometric performance parameters as per the mission goals. BBR of ≤ ± 1 pixel is achieved across the entire field of view. SWR is measured to be ≥ 20% for all the bands. SNR at ocean reference radiance is estimated to be between 920 and 1570 in LAC mode and between 780 and 2750 in GAC mode, showing a significant improvement over OCM-1/2 payload. Post-launch performance is evaluated w.r.t. SNR and BBR after applying various corrections and has been found to be meeting the specifications with adequate margins. This paper provides an overview of the design, results of the on-ground characterization and the post-launch performance of the OCM-3 payload flown onboard the Oceansat-3 (EOS-06) mission.