Haiyang (satellite) explained

Haiyang (HY,) is a series of marine remote sensing satellites developed and operated by the People's Republic of China since 2002., eight satellites have been launched with ten more planned.[1] [2] [3] [4] [5] Built by the state-owned aerospace contractor China Academy of Space Technology (CAST), Haiyang satellites carry a variety of ocean-imaging sensor payloads and are operated by the National Satellite Ocean Application Service (NSOAS), a subordinate agency of the State Oceanic Administration (SOA).[6] Haiyang satellites are launched from Taiyuan Satellite Launch Center (TSLC) into Sun-synchronous orbit (SSO) aboard Long March-series rockets.

China's National Satellite Ocean Application Service owns three series of Haiyang-series satellites, Haiyang-1 (HY-1) are designed to measure ocean color, Haiyang-2 (HY-2) to study maritime environment dynamics, and Haiyang-3 (HY-3) to conduct ocean surveillance.[7]

Spacecraft

Satellite bus

The first three of a total four Haiyang 1-series satellites are based on the CAST968 minisatellite bus, the same used three years prior for the Shijian 5 and carry multiple payloads. First launched aboard a Long March 4B rocket with Fengyun-1D in May 2002 into sun-synchronous orbit, the 367 kg HY-1A measures 1.2m × 1.1m × 0.94m reaching a total length of 7.5 meters with its solar panels extended. These satellites uses three magnetorquers and liquid hydrazine monopropellant for attitude control and to conduct on-orbit station-keeping. The spacecraft maintain attitude to approximately a half-degree using a Sun sensor and infrared Earth sensor. The spacecraft's imaging, transmission, and thermal heating systems are powered by two extended solar arrays providing 405 Watts (320 by end of life) and two packs of nickel-cadmium batteries that produce 23 ampere hours of DC power when the satellites' solar panels are not exposed to the sun.[8] Launched in June 2020, Haiyang 1D was the only satellite of the HY-1 series to be based on the CAST2000 bus instead of the CAST968 bus.

For telemetry, tracking, and command (TT&C) communication, the HY-1A uses the S-band with an uplink data-rate of 2 kilobits per second (kbps) and a downlink rate of 4 kbit/s. HY-1A stores up to 80 megabits of gathered payload data from the onboard COCTS and CZI instruments until it establishes communications with the Beijing, Hangzhou, and Sanya ground station to downlink the payload data over X-band with quadrature phase shift keying (QPSK) at a rate of 5.32 megabits per second.[9]

Sensor payloads

All four Haiyang 1 satellites (HY-1A through HY-1D) bear two maritime imaging sensors, the Chinese Ocean Color and Temperature Scanner (COCTS) and the Coastal Zone Imagery (CZI). Developed by the Shanghai Institute of Technical Physics (SITP), a subcomponent of the China Academy of Sciences (CAS), COCTS comprises a focal plane array (FPA), scanner, an electronics box, and a series of optics. The 50 kg sensor system collects 1.1 km spatial resolution maritime imagery within ten bands (eight in visible near infrared, VNIR, and two in thermal infrared, TIR) through a 200 mm aperture. COCTS rotates its imager ±35.2º, approximately 1400 km per swath.[10]

Chinese Ocean Color and Temperature Scanner (COCTS) Bands!Band!IR!Spectral range!S/N!Observation function
1VNIR0.402 – 0.422 μm440Yellow substance, water pollution
2VNIR0.433 – 0.453 μm600Chlorophyll absorption
3VNIR0.480 – 0.500 μm590Chlorophyll, sea ice, pollutants, shallow topography
4VNIR0.510 – 0.530 μm560Chlorophyll, water depth, low-concentration sediment
5VNIR0.555 – 0.575 μm525Chlorophyll, low-concentration sediment
6VNIR0.660 – 0.680 μm390Fluorescence, high-concentration sediment, aerosols, pollutants, atmospheric correction
7VNIR0.745 – 0.785 μm400High-concentration sediments, atmospheric correction
8VNIR0.845 – 0.885 μm415Atmospheric correction, water vapor
9TIR10.30 – 11.40 μmN/ASea surface temperature (SST), sea ice, cloud top temperature
10TIR11.40 – 12.50 μmN/ASST, sea ice, cloud top temperature
Also aboard all four HY-1 satellites is a Coastal Zone Imagery (CZI), developed by the Beijing Institute of Space Mechanics and Electricity (BISME,) under CAST.[11] [12] CZI is a four-band charge-coupled device (CCD), pushbroom multispectral imager (MSI). Sometimes referred to as the satellites' four-band CCD imager", CZI is intended to provide 250 m spatial resolution imagery over coastal regions in 36° (500 km) swaths. These bands are:

Due to power issues, the CZI sensor aboard Haiyang-1A lost functionality seventeen months after launch on 1 December 2003.

Haiyang 1C and Haiyang 1D both carried an ultraviolet imager, abbreviated UVI, providing twice-daily global coverage.[13] Used in conjunction with COCTS and CZI, HY-1C and HY-1D have been used to identify harmful algae blooms such as cyanobacteria in Lake Tai, detect marine oil spills near Indonesia, and measure nearshore turbidity with atmospheric correction.[14] [15] HY-1C and HY-1D's UVI images in two ultraviolet bands, 0.345 – 0.365 μm and 0.375 – 0.395 μm, both in the UV-A range.

Both HY-1C and HY-1D are equipped with a satellite calibration spectrometer (SCS) which provides on-orbit radiometric calibration for COCTS and UVI sensor systems.[16]

Haiyang 1C and Haiyang 1D also maintain an automatic identification system (AIS) payload, used to track and identify ship locations, to collect, store, and relay AIS messages globally. HY-1C and HY-1D's AIS system simultaneously operates on four bands: 161.975 MHz, 162.025 MHz, 156.775 MHz, and 156.825 MHz with a swath width of over 950 kilometers.

Satellites

!Name!Launch!Payloads!Orbit!Orbital apsis!Inclination!SCN!COSPAR ID!Launcher!Launch site!Status
Haiyang 1A15 May 2002COCTS, CZISSO787.7 km × 801.4 km98.6°27430Long March 4BTSLCDecayed
Haiyang 1B11 April 2007COCTS, CZISSO787.7 km × 807.7 km98.3°31113Long March 2CTSLCDecayed
Haiyang 1C7 September 2018COCTS, CZI, UVI, SCS, AISSSO776.2 km × 793.5 km98.4°43609Long March 2CTSLCOperational
Haiyang 1D10 June 2020COCTS, CZI, UVI, SCS, AISSSO782.6 km × 787.1 km98.5°45721Long March 2CTSLCOperational
Haiyang 1E(TBD 2022)UnknownSSO(Planned: Not yet launched)Long March 2CTSLCPlanned
Haiyang 1F(TBD 2024)UnknownSSO(Planned: Not yet launched)UnknownTSLCPlanned
Haiyang 2A15 August 2011ALT, CMR, DORIS, LRA, MWRI, SCATSSO975.0 km × 976.0 km99.3°37781Long March 4BTSLCOperational
Haiyang 2B24 October 2018ALT, CMR, DORIS, LRA, MWRI, SCATSSO972.5 km × 974.5 km99.3°43655Long March 4BTSLCOperational
Haiyang 2C21 September 2020ALT, CMR, DORIS, LRA, MWRI, SCATSSO953.6 km × 964.6 km66.0°46469Long March 4BTSLCOperational
Haiyang 2D19 May 2021ALT, CMR, DORIS, LRA, MWRI, SCATSSO950.7 km × 967.4 km66.0°48621Long March 4BTSLCOperational
Haiyang 2E(TBD 2023–2028)ALT, CMR, DORIS, LRA, MWRI, SCATSSO(Planned: Not yet launched)UnknownTSLCPlanned
Haiyang 2F(TBD 2024–2029)ALT, CMR, DORIS, LRA, MWRI, SCATSSO(Planned: Not yet launched)UnknownTSLCPlanned
Haiyang 2G(TBD 2025–2030)ALT, CMR, DORIS, LRA, MWRI, SCATSSO(Planned: Not yet launched)UnknownTSLCPlanned
Haiyang 2H(TBD 2023–2028)ALT, CMR, DORIS, LRA, MWRI, SCATSSO(Planned: Not yet launched)UnknownTSLCPlanned
Haiyang 3A16 November 2023SARSSOLong March 2C / YZ-1SJSLCOperational
Haiyang 3B(TBD 2024)SARSSO(Planned: Not yet launched)Long March 2C / YZ-1SJSLCPlanned
Haiyang 3C(TBD 2022)UnknownSSO(Planned: Not yet launched)UnknownTSLCPlanned
Haiyang 3D(TBD 2025–2033)UnknownSSO(Planned: Not yet launched)UnknownTSLCPlanned
Sources: NASA, US Space Force, CelesTrak, World Meteorological Organization

See also

References

  1. Web site: 31 March 2021 . HY 1A, 1B . 19 May 2021 . Gunter's Space Page.
  2. Web site: 22 September 2020 . HY 1C, 1D . 19 May 2021 . Gunter's Space Page.
  3. Web site: 29 September 2020 . HY 2A, 2B . 19 May 2021 . Gunter's Space Page.
  4. Web site: 19 May 2021 . HY 2C, 2D . 19 May 2021 . Gunter's Space Page.
  5. Web site: 10 December 2020 . HY 3A, 3B . 19 May 2021 . Gunter's Space Page.
  6. News: Clark . Stephen . 22 September 2020 . China launches Haiyang oceanography satellite . Spaceflight Now .
  7. 26 May 2020 . HY-2 Series Satellite Status and Future Plans . National Satellite Ocean Application Service .
  8. Web site: 30 May 2012 . HY-1A . eoPortal.
  9. Bracher . Astrid . May 2013 . Phytoplankton Community Structure from Ocean Colour: Methods, Validation, Intercomparisons and Applications . International Ocean Colour Science Meeting 2013 . IOCC. November 16, 2022.
  10. Book: Feng, Qi . 2006 Joint 31st International Conference on Infrared Millimeter Waves and 14th International Conference on Teraherz Electronics . Ten-Bands Ocean Color and Temperature Scanner . 2006 . https://ieeexplore.ieee.org/document/4222107 . September . 165 . 10.1109/ICIMW.2006.368373 . 1-4244-0399-5 . 22220927 . IEEE.
  11. Web site: 2020 . 组织机构 . Organization . China Academy of Space Technology . zh.
  12. Book: Chongling . Guo . Peng . Yang . 6th International Symposium of Space Optical Instruments and Applications . Achievements and Prospects of Space Optical Remote Sensing Camera Technology . 2021 . https://link.springer.com/chapter/10.1007/978-3-030-56488-9_15 . Space Technology Proceedings . 7 . 171–181 . 10.1007/978-3-030-56488-9_15 . 978-3-030-56487-2 . 234166136 . Springer.
  13. Web site: 26 May 2020 . HY-1C_1D . eoPortal.
  14. Suo . Ziyi . Lu . Yingcheng . Liu . Jianqiang . Ding . Jing . Xing . Qianguo . Yin . Dayi . Xu . Feifei . Liu . Jingchao . 2022-05-01 . HY-1C ultraviolet imager captures algae blooms floating on water surface . Harmful Algae . en . 114 . 102218 . 10.1016/j.hal.2022.102218 . 35550297 . 247426725 . 1568-9883.
  15. Suo . Ziyi . Lu . Yingcheng . Liu . Jianqiang . Ding . Jing . Yin . Dayi . Xu . Feifei . Jiao . Junnan . 26 April 2021 . Ultraviolet remote sensing of marine oil spills: a new approach of Haiyang-1C satellite . Optics Express . 29 . 9 . 13486–13495. 10.1364/OE.423702 . 33985080 . 2021OExpr..2913486S . 233530917 .
  16. Xu . He-yu . Zhang . Li-ming . Huang . Wen-xin . Xu . Wei-wei . Si . Xiao-long . Chen . Xin Li . Song . Qing-jun . 28 September 2020 . Onboard absolute radiometric calibration and validation of the satellite calibration spectrometer on HY-1C . Optics Express . 28 . 20 . 30015–30034. 10.1364/OE.402616 . 33114888 . 2020OExpr..2830015X . 224939022 .

External links