China Launches Haiyang-2E Satellite to Upgrade Ocean Monitoring Network

China successfully launched the Haiyang-2E (HY-2E) ocean monitoring satellite on July 2, 2026, further upgrading its ocean dynamic environment monitoring network. The satellite lifted off at 07:46 Beijing time (late July 1 UTC) from the Jiuquan Satellite Launch Center in Inner Mongolia aboard a Long March 4B carrier rocket, according to People’s Daily. The launch marked the 654th flight of the Long March series and the satellite has successfully entered its planned orbit.

Context: China’s Ocean Satellite Program

The Haiyang (“Ocean”) satellite series is China’s dedicated ocean observation program, divided into two branches: the HY-1 series for ocean color monitoring (tracking chlorophyll, sediment, and coastal changes) and the HY-2 series for ocean dynamic environment monitoring. The HY-2 series began with HY-2A in 2011, China’s first ocean dynamic environment satellite, and has since evolved into a constellation approach with HY-2B (launched in 2018), HY-2C (2020), and HY-2D (2021). HY-2E now marks the beginning of the second phase of this constellation, as reported by Xinhua News. The constellation approach enables rapid revisit times and comprehensive global coverage, significantly improving China’s ability to monitor the world’s oceans.

Key Developments

HY-2E is an operational satellite under China’s National Civil Space Infrastructure Mid- and Long-Term Development Plan. Developed by the China Academy of Space Technology (CAST), part of the China Aerospace Science and Technology Corporation (CASC), the satellite will replace the aging HY-2B satellite to ensure continuity of observation data. It will join the in-orbit HY-2C and HY-2D satellites to form a robust ocean dynamic environment satellite constellation.

The satellite carries four main microwave remote sensing payloads: a radar altimeter for measuring sea surface height and significant wave height, a microwave scatterometer for sea surface wind fields, a microwave radiometer for sea surface temperature, and a calibration radiometer. It also features a Ship Automatic Identification System (AIS) and a data collection system, according to the China National Space Administration.

Zhang Qingjun, an expert at CASC’s Fifth Academy, explained that HY-2E will “ensure the continuous and stable operation of China’s ocean dynamic environment monitoring” alongside its sister satellites, as quoted by China News Service.

Applications and Impact

The HY-2 constellation serves multiple critical functions across scientific, economic, and safety domains. For weather forecasting, the satellites capture typhoon data multiple times daily, providing essential information for disaster warning systems that protect coastal communities. The data also supports El Niño and La Niña research, climate change studies, and global numerical weather prediction models. Internationally, HY-2 data has increased the contribution of Chinese satellite observations to global forecasting systems.

In the fisheries sector, the satellite data helps locate fish stocks, improving catch efficiency while reducing fuel consumption. “Obtaining fishery information in advance not only helps increase fishing vessel output but also reduces fuel consumption, bringing significant economic benefits,” Zhang Qingjun told Xinhua.

For maritime safety, the AIS system on HY-2 satellites provides global ship tracking capabilities, overcoming the 60-kilometer range limitation of traditional shore-based AIS. Zhang described this as equivalent to a “ship electronic ID card plus maritime traffic broadcast,” creating a transparent safety network for vessels worldwide.

Analysis and Implications

The launch of HY-2E represents China’s systematic investment in space-based ocean monitoring infrastructure. By transitioning to the second phase of its ocean satellite constellation, Beijing is ensuring long-term data continuity—a critical factor for climate monitoring, weather forecasting, and maritime domain awareness. The satellite’s polar-orbiting design enables global coverage, making it a valuable asset for both national and international scientific communities.

Notably, HY-2E features payload technology upgrades with significantly improved nearshore observation capabilities, suggesting a growing focus on coastal zone monitoring. This is vital for economic activities, port management, and environmental protection along China’s extensive coastline. The improved nearshore resolution represents a meaningful technological advancement over the previous generation of HY-2 satellites.

China’s HY-2 satellite data is already integrated into global numerical weather prediction systems, demonstrating international scientific collaboration. The satellite’s AIS capability also contributes to global maritime safety as a public good with far-reaching international implications, enabling better tracking of vessels in remote ocean regions.

What’s Next

With HY-2E now operational, China’s ocean dynamic environment monitoring network will maintain continuous, stable coverage. The satellite’s expected operational lifespan and specific technology upgrades compared to its predecessor remain areas to watch. As China continues to expand its space-based Earth observation capabilities under its civil space infrastructure plan, the HY-2 constellation will play an increasingly central role in marine science, climate research, and maritime security.