Remote sensing 3 1 02 satellite group successfully launched! What is the purpose of launching a remote sensing satellite?

At 2002165438+129 October 12: 47, China successfully put the remote sensing satellite 3 1 02 into the scheduled orbit by the Long March IV C carrier rocket at Jiuquan Satellite Launch Center.

Definition of remote sensing satellite: it is an artificial satellite used as a remote sensing platform for outer space. Satellite-based remote sensing technology is called satellite remote sensing. Usually, remote sensing satellites can run in orbit for many years. Satellite orbit can be calculated and determined according to needs. Remote sensing satellites can cover the whole earth or any designated area within a specified time. When it runs along the geosynchronous orbit, it can continuously remotely sense the designated area of the earth's surface. All remote sensing satellites need a remote sensing satellite ground station, and the satellite data obtained from the remote sensing market platform can monitor agriculture, forestry, ocean, land, environmental protection and meteorology.

According to the main uses of remote sensing satellites, there are the following three categories:

1. Meteorological satellite: The main task of meteorological satellite remote sensing satellite is to collect meteorological data, monitor weather forecast, typhoon formation and movement, monitor snow cover, and obtain a large number of real-time data needed for atmospheric and space physics research. There are two kinds of meteorological satellites, one is polar orbit meteorological satellite and the other is geostationary orbit meteorological satellite. The polar-orbiting meteorological satellite runs in a sun-synchronous orbit with an altitude of 600 ~ 1400 km, and observes strips several meters wide on the ground along the flight orbit with a resolution of 1 ~ 4 km. It can orbit the earth 14 times a day and observe anywhere in the world twice. The geostationary meteorological satellite is located at a certain point in the geostationary orbit about 36,000 kilometers above the equator, and can continuously observe 40% of the earth below the satellite. This has a strong timeliness for monitoring disastrous weather and is suitable for regional short-term weather forecasting business. Its disadvantage is that for latitudes greater than 70? The meteorological observation ability in high latitudes is poor. ?

2.Landsat: Landsat is a sun-synchronous satellite orbiting the earth's north and south poles, with a nearly circular orbit. The satellite is also equipped with a data acquisition system to collect telemetry data and forward it to the data center. The satellite of the processing center may not be equipped with a video recorder, and the remote sensing image data collected outside the receiving signal range of the ground receiving station are transmitted to the ground receiving and processing station for processing through the tracking and data relay satellite system. Landsat remote sensing data are widely used in land survey, geological survey, oil exploration, agriculture, forestry survey and planning, project site selection and route selection, coastal mapping, topographic mapping, disaster monitoring and disaster assessment and many other fields. ?

3. Ocean satellite: Ocean satellite is a kind of remote sensing satellite, whose main task is to collect information about marine resources and surrounding environment. The ocean accounts for more than two-thirds of the earth's area and is rich in resources, which has a great influence on the climate. Therefore, it is of great significance to study the ocean by using satellite remote sensing technology. The synthetic aperture side-looking radar on the satellite can work day and night. Radar waves penetrate clouds and dense vegetation to obtain surface images. It can distinguish ice and snow from water, and plays a great role in the research of sea ice and land snow, geological structure, flood and so on. You can also get ocean data, such as the height, length and frequency spectrum of waves, ocean wind speed and direction, ocean temperature, ocean current, circulation, sea surface and global horizon. Ocean satellites can provide continuous, comprehensive and synchronous observation data of the global ocean, which cannot be achieved by any other observation means. ?

From April 27th, 2006 to October 29th, 2006, China launched 32 remote sensing satellites. The purpose of launching the remote sensing satellite 3 1 02 is to detect the electromagnetic environment and test related technologies. ?