Tag Archives: Yaogan

China’s Constellation of Yaogan Satellites & the ASBM: May 2016 Update

China’s Constellation of Yaogan Satellites & the ASBM: May 2016 Update

Authors: S. Chandrashekar and Soma Perumal

To read the complete report click here

To cite: S. Chandrashekar and Soma Perumal. China’s Constellation of Yaogan Satellites & the ASBM: May 2016 Update. ISSSP Report No. 03-2016. Bangalore: International Strategic and Security Studies Programme, National Institute of Advanced Studies, May 2016, available at http://isssp.in/chinas-constellation-of-yaogan-satellites-the-asbm-may-2016-update/


Yaogan May 2016With the launch of the Yaogan 28, Yaogan 29 in November 2015 and Yaogan 30 satellite in May 2016, China has demonstrated its ability to routinely identify, locate and track an Aircraft Carrier Group (ACG) on the high seas. This space capability is an important component of an Anti-Ship Ballistic Missile (ASBM) System that China has set up. The current operational satellite constellation consists of ELINT satellites, satellites carrying Synthetic Aperture Radar (SAR) sensors as well as satellites carrying optical imaging sensors.

Based on the orbit characteristics, their local time of equatorial crossing and other related parameters, these satellites can be grouped into different categories that perform the various functions for identifying, locating and tracking the ACG.

Yaogan 9 (Yaogan 9A, 9B, 9C), Yaogan 16 (16A, 16B, 16C), Yaogan 17 (17A, 17B, 17C), Yaogan 20 (20A, 20B, 20C) and Yaogan25 (25A, 25B, 25C) are the five triplet cluster equipped with ELINT sensors that provide broad area surveillance over the Oceans. With a coverage radius of about 3500 Km, they provide the first coarse fix for identifying and locating an ACG in the Pacific Ocean. Yaogan 20 and Yaogan 25 may be replacements for the Yaogan 9 and the Yaogan 16 that may be nearing the end of their lives.

Yaogan 23, Yaogan 29, Yaogan 10, and Yaogan 18 are the satellites carrying a SAR sensor. With Local times of crossing of 02 00, 04 30, 06 00, and 10 00 hours they provide all weather as well as day and night imaging capabilities over the regions of interest.

Yaogan 30, Yaogan 26, Yaogan 4, Yaogan 24, Yaogan 28, Yaogan 7 and Yaogan 21 constitute the high resolution optical satellites in the current constellation. The sensors they carry may have resolutions of between 1 to 3 m. Their local times of crossing of 09 00, 10 30, 11 00, 13 30, 14 00, 15 00 and 17 30 hours respectively ensure favourable illumination conditions for their imaging missions.

Yaogan 27, Yaogan 19, Yaogan 22 and Yaogan 15 satellites with local times of crossing of 09 30, 10 30, 13 30 and 14 30 hours respectively are optical imaging satellites with medium resolution (3 to 10 m) capabilities. They act as a broad area coverage complement for the SAR as well as the high resolution optical imaging satellites. Yaogan 27 is a replacement for the Yaogan 8 that may be nearing the end of its life.

Using typical sensor geometries and the two line orbital elements available from public sources the ability of the current constellation to identify, locate and track the ACG was simulated.

Assuming that any three of the ELINT clusters are operational at any given point in time the ELINT satellites typically make 18 contacts in a day with the moving target. The maximum period for which the target remains outside the reach of the ELINT satellites is about 90 minutes in a day. The SAR and the optical imaging satellites together typically provide 24 satellite passes over the target. About 16 targeting opportunities, during which the uncertainty in the target’s location is less than 10 km, are available in a day.

The analysis and the simulation results suggest that China has in place an operational ASBM system that can identify, locate, track and destroy an Aircraft Carrier in the Pacific Ocean. This seems to be an important component of a larger Chinese Access and Area Denial Strategy focused around a conflict over Taiwan.

To read the complete report click here

About the Authors

S. Chandrashekar is JRD Tata Chair Professor in the International Strategic and Security Studies Programme, NIAS, Bangalore. He can be reached at chandrashekar.schandra[at]gmail.com

Soma Perumal is Adjunct Faculty in the International Strategic and Security Studies Programme, NIAS, Bangalore. He can be reached at som598[at]yahoo.com


 

China’s Constellation of Yaogan Satellites & the ASBM: October 2015 Update

China’s Constellation of Yaogan Satellites & the Anti-Ship Ballistic Missile: October 2015 Update

Authors: S. Chandrashekar and Soma Perumal

To read the complete report in PDF click here

Yaogan Oct 2015 UpdateWith the recent launches of the Yaogan 26 and Yaogan 27 satellites China has demonstrated its ability to routinely identify, locate and track an Aircraft Carrier Group (ACG) on the high seas. This space capability is an important component of an Anti-Ship Ballistic Missile (ASBM) System that China has set up.

The current operational satellite constellation consists of ELINT satellites, satellites carrying Synthetic Aperture Radar (SAR) sensors as well as satellites carrying optical imaging sensors.

Based on the orbit characteristics, their local time of equatorial crossing and other related parameters, these satellites can be grouped into different categories that perform the various functions for identifying, locating and tracking the ACG.

Yaogan 9 (Yaogan 9A, 9B, 9C), Yaogan 16 (16A, 16B, 16C), Yaogan 17 (17A, 17B, 17C), Yaogan 20 (20A, 20B, 20C) and Yaogan25 (25A, 25B, 25C) are the five triplet cluster equipped with ELINT sensors that provide broad area surveillance over the Oceans. With a coverage radius of about 3500 Km, they provide the first coarse fix for identifying and locating an ACG in the Pacific Ocean. Yaogan 20 and Yaogan 25 may be replacements for the Yaogan 9 and the Yaogan 16 that may be nearing the end of their lives.

Yaogan 23, Yaogan 10, Yaogan 18, Yaogan 14 and Yaogan 21 are the current operational satellites carrying a SAR sensor. With Local times of crossing of 02 00, 06 00, 10 00, 14 00 hours and 1730 hours, they provide all weather as well as day and night imaging capabilities over the regions of interest.

The Yaogan 26 which had replaced the Yaogan 12 which in turn had replaced the Yaogan 5 has the orbital characteristics of a SAR mission but its local time of crossing is 10 30 AM. This is very close to the 10 00 hours crossing time of the Yaogan 18 SAR satellite. This could therefore be either a SAR mission or a high resolution optical imaging mission. From the orbit characteristics this may possibly carry a SAR.

Yaogan 11, Yaogan 4, Yaogan 24 and Yaogan 7 constitute the high resolution optical satellites in the current constellation. The sensors they carry may have resolutions of between 1 to 3 m. Their local times of crossing of 09 00, 11 00, 13 30, and 15 00 hours respectively ensure favourable illumination conditions for their imaging missions.

Yaogan 27, Yaogan 19, Yaogan 22 and Yaogan 15 satellites with local times of crossing of 09 30, 10 30, 13 30 and 14 30 hours respectively are optical imaging satellites with medium resolution (3 to 10 m) capabilities. They act as a broad area coverage complement for the SAR as well as the high resolution optical imaging satellites. Yaogan 27 is a replacement for the Yaogan 8 that may be nearing the end of its life.

Using typical sensor geometries and the two line orbital elements available from public sources the ability of the current constellation to identify, locate and track the ACG was simulated.

Assuming that any three of the ELINT clusters are operational at any given point in time the ELINT satellites typically make 18 contacts in a day with the moving target. The maximum period for which the target remains outside the reach of the ELINT satellites is about 90 minutes in a day.

The SAR and the optical imaging satellites together typically provide 24 satellite passes over the target. About 16 targeting opportunities, during which the uncertainty in the target’s location is less than 10 km, are available in a day.

The analysis and the simulation results suggest that China has in place an operational ASBM system that can identify, locate, track and destroy an Aircraft Carrier in the Pacific Ocean. This seems to be an important component of a larger Chinese Access and Area Denial Strategy focused around a conflict over Taiwan.

China’s Constellation of Yaogan Satellites & the ASBM : January 2015 Update

China’s Constellation of Yaogan Satellites & the Anti-Ship Ballistic Missile: January 2015 Update

Authors: S. Chandrashekar and Soma Perumal

To read the complete report in PDF click here

Yaogan Jan 2015With the recent launches of the Yaogan 20, 21, 22, 23, 24 and 25 satellites China has augmented its advanced space capabilities to routinely identify, locate and track an Aircraft Carrier Group (ACG) on the high seas. This space capability is an important component of an Anti-Ship Ballistic Missile (ASBM) System that China has set up.

The current operational satellite constellation consists of ELINT satellites, satellites carrying Synthetic Aperture Radar (SAR) sensors as well as satellites carrying optical imaging sensors.

Based on the orbit characteristics, their local time of equatorial crossing and other related parameters, these satellites can be grouped into different categories that perform the various functions for identifying, locating and tracking the ACG.

Yaogan 9 (Yaogan 9A, 9B, 9C), Yaogan 16 (16A, 16B, 16C), Yaogan 17 (17A, 17B, 17C), Yaogan 20 (20A, 20B, 20C) and Yaogan25 (25A, 25B, 25C) are the five triplet cluster equipped with ELINT sensors that provide broad area surveillance over the Oceans. With a coverage radius of about 3500 Km, they provide the first coarse fix for identifying and locating an ACG in the Pacific Ocean. Yaogan 20 and Yaogan 25 may be replacements for the Yaogan 9 and the Yaogan 16 that may be nearing the end of their lives.

Yaogan 23, Yaogan 10, Yaogan 18, Yaogan 14 and Yaogan 21 are the current operational satellites carrying a SAR sensor. With Local times of crossing of 02 00, 06 00, 10 00, 14 00 hours and 1730 hours, they provide all weather as well as day and night imaging capabilities over the regions of interest.

Yaogan Satellite being launched (China TV Website)

Long March-2C rocket taking off with the Yaogan Satellite from the Taiyuan Satellite Launch Center (Source: China TV Website)

Yaogan 11, Yaogan 4, Yaogan 24 and Yaogan 7 constitute the high resolution optical satellites in the current constellation. The sensors they carry may have resolutions of between 1 to 3 m. Their local times of crossing of 09 00, 11 00, 13 30, and 15 00 hours respectively ensure favourable illumination conditions for their imaging missions.

Yaogan 8, Yaogan 19, Yaogan 22 and Yaogan 15 satellites with local times of crossing of 09 30, 10 30, 13 30 and 14 30 hours respectively are optical imaging satellites with medium resolution (3 to 10 m) capabilities. They act as a broad area coverage complement for the SAR as well as the high resolution optical imaging satellites.

The Yaogan 12 which replaced the Yaogan 5 has the orbital characteristics of a SAR mission but its local time of crossing is 10 30 AM. This is very close to the 10 00 hours crossing time of the Yaogan 18 SAR satellite. This could therefore be either a SAR mission or a high resolution optical imaging mission.

Using typical sensor geometries and the two line orbital elements available from public sources the ability of the current constellation to identify, locate and track the ACG was simulated.

Assuming that any three of the ELINT clusters are operational at any given point in time the ELINT satellites typically make 18 contacts in a day with the moving target. The maximum period for which the target remains outside the reach of the ELINT satellites is about 90 minutes in a day.

The SAR and the optical imaging satellites together typically provide 24 satellite passes over the target. About 16 targeting opportunities, during which the uncertainty in the target’s location is less than 10 km, are available in a day.

The analysis and the simulation results suggest that China has in place an operational ASBM system that can identify, locate, track and destroy an Aircraft Carrier in the Pacific Ocean. This seems to be an important component of a larger Chinese Access and Area Denial Strategy focused around a conflict over Taiwan.

Conducting Academic and Policy Research related to National and International Security Issues
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