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Space-based radar, also known as spaceborne radar, is a radar that operates in space; orbiting radar, also known as geocentric orbiting radar, is a radar that is in orbit around the Earth. Synthetic aperture radar (SAR) has been used by a number of Earth-observing satellites, including RADARSAT, to collect data on the geography and land cover of the planet.
For the US Department of Defense, a constellation of operational radar satellites known as space-based radar (SBR) has been suggested. Similar to the Soviet US-A programme, the SBR system would enable the detection and tracking of aeroplanes, ocean-going vessels, and maybe land vehicles from space. Following that, regional and national command centres would receive this information.
The precision of a satellite radar-measurements altimeter’s of the topography of the ocean’s surface is on the order of a few centimetres. It is a nadir-looking radar with very high range resolution. Additionally, study of the echo’s amplitude and shape can be used to determine, respectively, the wind speed and wave height.
The smaller footprint of some radar-altimeters, such as CryoSat/SIRAL, that use synthetic aperture and/or interferometric techniques, enables the mapping of rougher surfaces, such as polar ice.
The Global Space Radar market accounted for $XX Billion in 2022 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2023 to 2030.
Several satellites now employ these three types of radar. Scatterometers are very useful for operational meteorology because they make it possible to recreate wind fields on a global scale.
For the precise estimation of the geoid, monitoring of tides, ocean currents, and other significant ocean phenomena like El Nio, radar altimeters’ data are used. There are numerous uses for SARs, including geology, agriculture monitoring, measuring sea ice, monitoring disasters, tracking vessel traffic, and military uses (many civilian SAR satellites are,in fact,dual-use systems).
SAR imaging is the sensor of choice when data continuity must be guaranteed because, unlike its optical counterparts, it is not impacted by weather circumstances like clouds, fog, etc. Additionally, SRTM mission’s usage of SAR interferometry.
When a satellite passes over a specific area of the ocean’s surface, a wind scatterometer measures the echo amplitude and the accompanying surface reflectance from various (at least three) points of view.
This instrument can determine the wind speed and direction since reflection is influenced by the “roughness” of the water surface, which in turn is influenced by the wind and also depends on its direction.
