# COSI (Corea SAR Instrument)
*sensor . products*

X-band multi-mode synthetic aperture radar payload flown on KOMPSAT-5.

## Specifications
- **product status**: operational
- **deployment context**: orbital
- **manufacturer**: thales-alenia-space
- **sensor**: {"instrument_family":"sar","measurement_principle":"active","frequency_band":"X","centre_frequency_mhz":9660,"chirp_bandwidth_mhz":240,"polarisation_modes":["HH","HV","VH","VV"],"incidence_angle_range_deg":[20,55],"modes":[{"name":"High Resolution","resolution_range_m":1,"swath_km":5},{"name":"Standard","resolution_range_m":3,"swath_km":30},{"name":"Wide Swath","resolution_range_m":20,"swath_km":100}],"swath_km":100,"notes":"mCube mission profile reports COSI as a multi-mode X-band SAR provided by Thales Alenia Space Italy, with HR/ST/WS modes and extended access variants."}
- **entity type**: sensor
- **last verified date**: 2026-06-16
- **verified by**: community
- **claim status**: agency-sourced
- **provider**: thales-alenia-space
- **attributes**: {"kind":"sensor","product_status":"operational","deployment_context":"orbital","manufacturer":"thales-alenia-space","description":"X-band multi-mode synthetic aperture radar payload flown on KOMPSAT-5.","sensor":"{\"instrument_family\":\"sar\",\"measurement_principle\":\"active\",\"frequency_band\":\"X\",\"centre_frequency_mhz\":9660,\"chirp_bandwidth_mhz\":240,\"polarisation_modes\":[\"HH\",\"HV\",\"VH\",\"VV\"],\"incidence_angle_range_deg\":[20,55],\"modes\":[{\"name\":\"High Resolution\",\"resolution_range_m\":1,\"swath_km\":5},{\"name\":\"Standard\",\"resolution_range_m\":3,\"swath_km\":30},{\"name\":\"Wide Swath\",\"resolution_range_m\":20,\"swath_km\":100}],\"swath_km\":100,\"notes\":\"mCube mission profile reports COSI as a multi-mode X-band SAR provided by Thales Alenia Space Italy, with HR/ST/WS modes and extended access variants.\"}"}
- **technology**: radar

## Editorial
COSI, the Corea SAR Instrument, is a multi-mode X-band synthetic-aperture radar payload flown on KOMPSAT-5 and provided by Thales Alenia Space.[^mcube-kompsat5][^wmo-kompsat5] It is recorded at 9.66 GHz centre frequency with 9-240 MHz range bandwidth, nominal 20-45 degree incidence access, extended access to 55 degrees, and selectable single polarisation among HH, HV, VH and VV.[^mcube-kompsat5]

The defensible buyer-level mode baseline is the high-resolution, standard and wide-swath SAR collection classes, with extended access treated as conditional collection context rather than the baseline mode set.[^mcube-kompsat5] That framing keeps COSI useful for X-band archive comparison while keeping detailed extended-mode variants separate from baseline tasking assumptions.[^mcube-kompsat5][^egeos-kompsat5]

COSI has demonstrated SAR backscatter and SAR backscatter change-detection use through the KOMPSAT-5 mission context.[^mcube-kompsat5] The payload is buyer-relevant where X-band archive continuity, selectable linear polarisation and medium-to-high resolution SAR imaging are more important than a fully open mode matrix.[^mcube-kompsat5][^egeos-kompsat5]

## Compositional position
- kompsat-5 (missions) --[mission_payloads]--> COSI (Corea SAR Instrument)

## Sources
- [mcube-kompsat5] | KOMPSAT-5 mission and COSI sensor parameters, mCube | https://docs.mcube.terradue.com/missions/sar/kompsat-5/ | tier=third-party | accessed=2026-06-16
- [wmo-kompsat5] | KOMPSAT-5 satellite record, WMO OSCAR | https://space.oscar.wmo.int/satellites/view/kompsat_5 | tier=agency-doc | accessed=2026-06-16
- [egeos-kompsat5] | KOMPSAT-5 product page, e-GEOS | https://www.e-geos.it/en/kompsat-5/ | tier=operator-datasheet | accessed=2026-06-16

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Source: https://eo-atlas.org/products/sensor/cosi
Maintainer: SpectraWorks B.V. (CC-BY 4.0)