Remote Sensing Satellite Virtual Constellation Military _ Remote Sensing Satellite

What does a military satellite look like?

Military satellites refer to artificial earth satellites used for various military purposes. Military satellites can generally be divided into:? Navigation and positioning satellite, missile early warning satellite, military communication satellite, electronic eavesdropping satellite.

Navigation and positioning satellite

American Global Positioning System (GPS)? The satellite network plan consists of 24 satellites. Its constellation distribution is:? Each track surface includes 4? There are six satellites? Orbiting plane. The track inclination is 55, and the track height is 20233km. Carrier frequency L (D 1) = 1227 MHz, L (D2) = 1575 MHz. Navigation information code rate 50 bit/s per GPS? This satellite weighs 2032 kilograms. Satellites in orbit 16. GPS？ There are two systems, one is C/A? Code, the positioning accuracy is specified as 100m, it is reported that the actual achievable accuracy of this code is 35m, because this accuracy is close to the military requirements, so it is reduced to 100m for commercial use. The other one is p? Code, designed for military use, its positioning accuracy is 18m. During the Gulf War, non-American users were restricted from using GPS? Signal, expressed in C/A? A special code is added to the code used in the battlefield.

Missile early warning satellite

Both the United States and the former Soviet Union have developed strategic missile early warning satellites. The early warning satellite in the United States is called DSP (Defense Support Program). The satellite weighs 900 kilograms and is located in a fixed-point orbit above the equator. Large infrared telescopes are used to detect infrared signals emitted by missiles. By analyzing the intensity of these signals and the difference with the cold background of the earth, the missile model is identified, and these signals are sent to the ballistic missile early warning system on the ground to calculate the impact point of the missile. During the Gulf War, the US military released at least two DSPs? The satellite was moved over the war zone to monitor the launch of Iraqi Scud tactical missiles. The infrared telescope on the satellite scans every 12 seconds, providing near real-time information, which is processed by the computer of the US Air Force. Second forecast landing point, providing 90 seconds warning time for the front line. This information also guided the Patriot missile to intercept and gave the Scud missile a launching point to organize the bombing of its launcher. Starting from 1994, the United States has developed a new generation of early warning satellites to strengthen the early warning of tactical missiles.

Military communication satellite

The representative military communication satellite system in use is DSCS-III satellite, the national defense satellite communication system of the United States, which is similar to Skynet 4 in Europe. Satellites and American Fleetsatcom? Wait a minute. The weight of DSCS-3 satellite is 1042kg, the satellite body is cubic, the three axes are stable, and a pair of suns? Atlas of Military Satellites (4 pictures) The sails point to the sun. Satellites have anti-jamming and anti-jamming measures. There are two kinds of antennas on the satellite, one is multi-beam antenna, which has the ability to receive 6 1 beam; ? The other is two receiving antennas, 19 beam. The waveform of the antenna is controlled by the ground, and the coverage area of the satellite can be selected. The working life of the satellite is 10 year.

Electronic eavesdropping satellite

Both the United States and the former Soviet Union have developed and deployed electronic eavesdropping satellite systems. According to reports, the eavesdropping satellite system of the former Soviet Union consisted of 6? Satellites form a constellation with an orbital height of 650 kilometers. The electronic eavesdropping satellites in the United States have been developed for two generations, and the two satellites used are Vortex and Magnum respectively. The main function of electronic eavesdropping satellite is to collect the information of ground radar system, monitor the telemetry information of missile test, and judge the performance of missile. It can also eavesdrop on the enemy's operational commands and passwords in combat. Because electronic eavesdropping on satellites is a highly confidential plan, there is little public information.