my country's radar satellite sea and land observation capabilities have been greatly improved

On April 7, China successfully launched the Gaofen-3-03 satellite with the Long March 4C carrier rocket at the Jiuquan Satellite Launch Center
.

After the Gaofen-3-03 satellite is launched into orbit, it will form a network with the in-orbit Gaofen-3 and Gaofen-3-02 satellites to form a constellation of marine and land radar satellites, achieve 1-meter resolution, 1-day revisit, and improve China's radar Satellite sea and land observation capabilities
.

Samsung's network of sea and land radar satellite constellations formed

Gaofen-3 03 star is a business star in the "National Civil Space Infrastructure Medium and Long-term Development Plan (2015-2025)".
It is developed by the Fifth Academy of Aerospace Science and Technology Group.
The Gaofen-3 and Gaofen-3 02 satellites are networked to form a constellation of land and sea radar satellites
.

According to reports, Samsung will work together to weave a "satellite network" in space, which can meet the application needs of marine disaster prevention and mitigation, marine dynamic environmental monitoring, marine scientific research, and disaster reduction, land, environmental protection, water conservancy, agriculture and meteorology
.

The Gaofen-3 satellite successfully launched in August 2016 is the first C-band, multi-polarization, high-resolution Synthetic Aperture Radar (SAR) satellite independently developed by China.
More than 50 innovative technologies have been adopted in the development process.
All-weather monitoring, high-precision measurement, multi-mode imaging and other outstanding advantages
.

In November 2021, the Gaofen-3-02 satellite was successfully launched, and the Gaofen-3 satellite achieved dual-satellite operation
.

On the basis of the Gaofen-3 satellite, the 03 and 02 satellites of Gaofen-3 have added an automatic identification system (AIS), and some performances have been upgraded and optimized

The successful launch of the Gaofen-3 03 satellite marks the successful completion of the Gaofen-3 series of satellites
.

After the Samsung network is formed, the overall imaging capability will be greatly improved, marking that China's civil high-resolution synthetic aperture radar satellite data has officially entered the commercial application stage from the demonstration application stage

1+1+1>3 networking operation improves application performance

"The biggest feature of the network operation is to give full play to the advantages of multi-satellite collaborative observation to form an application efficiency of 1+1+1>3
.

" The researchers from the Fifth Academy of Aerospace Science and Technology Group introduced

According to the Gaofen-3 03 satellite development team, in order to maximize the application efficiency of the satellites, the development team chose to evenly distribute the Gaofen-3 series of satellites on the same orbital plane.
The time for Samsung to circle the earth is 99 minutes
.

This design will increase the number of satellite observations, improve the revisit capability and global coverage capability, and further enhance the satellite's ability to support marine information services and disaster response

"The Samsung network will greatly shorten the revisit cycle and greatly improve the ability to image large areas of the ocean,
" said Zhang Qingjun, chief commander and chief designer of the Gaofen-3 series satellites
.

In 2016, once the Gaofen-3 satellite was launched, it created a record of nearly an hour of single continuous imaging by a high-power remote sensing satellite
.

After the Samsung network is formed this time, it will be possible to take pictures of nearly one-fifth of the world's ocean area with one imaging, and it will become easier to give the earth a "family portrait"

Internationally leading comprehensive performance of onboard payloads

The satellite function is improved, and the payload performance is very important
.

The Gaofen-3 constellation synthetic aperture radar payload is in charge of the overall system by the Aerospace Microwave Remote Sensing System Department of the Institute of Aerospace Information Innovation, Chinese Academy of Sciences

According to the person in charge of the synthetic aperture radar payload development team of the Academy of Astronautics and Astronautics of the Chinese Academy of Sciences, the main payload of the Gaofen-3-03 satellite is a C-band multi-polarization synthetic aperture radar with a maximum resolution of 1 meter, with single-polarization, dual-polarization and omnipolar.

The maximum imaging width is 650 kilometers, and the imaging working modes can be expanded to 20, making the satellite the C-band synthetic aperture radar satellite with the highest comprehensive performance in the world

It is reported that three new test modes have been added to the GF-3 03 satellite synthetic aperture radar payload
.

Among them, the high-resolution wide-format mode achieves a resolution of 5 meters and an imaging width of 120 kilometers, which improves the quality factor of synthetic aperture radar imaging and enables finer observation of a wider range of land and sea surfaces; the moving target detection and ocean current measurement modes can Realize high-precision moving target detection and ocean flow field measurement, further expanding the application capabilities of satellites