The United States can the martial strategy distribution that the palm controls to spread all over the whole world, one of the mainest reasons are to own the location system with the most advanced whole world, also can say for GPS. Go up century seventies, empty three armed services of American sea land combines research and development newest dimensional satellite navigation locates system. The whole world locates the system shares 24 satellites, its job principle is to use fixed position of time range finding, can undertake to area of the either on the earth round-the-clock real time is monitored, include the ship of sea land empty area, car, plane, missile among them, it is satellitic airship also can undertake three-dimensional fixed position measures high accuracy even fast.
Although be in completely new area, the data of real time fixed position that the U.S. Army also can allow according to this kind of high spirit, the deploy that has car ship and other equipment will finish its tactics to act. Global location system although the U.S. Army is brought very big convenient, but consider from other side, this also is one kind reachs its deadly limitation, the more satellite of advanced fixed position navigation, let an U.S. Army be immersed in huge dependence the more. If be depended on in the light of this kind, allow its be no longer in force through measure of a few technologies, so such martial strategy system can break down for an instant, position of issue of whole U.S. Army also is met instantaneous invalidation.
Want to allow be no longer in force of global location system, should take its run mode only above all. The working principle of GPS, basically give out in what at least 3 satellites receive in 24 satellites time with signal of range finding system, decide with triangulation its are specific next azimuth. That is to say if global location system receives the signal of 3 satellites only, will of certain level reduce its accuracy. The azimuth of three dimensional space that a whole whole world locates systematic receiver wants essence of life to allow computation to define a goal needs the data of 4 satellites, ability finishs triangulation. The microwave part in the electromagnetism spectrum that GPS receiver system uses, the speed that its transmit data is every second 186, 000 miles. If weaken the transmission of its signal with this on one hand, so this system will not move, the method that can destroy its to move basically has the following kinds.
One, kinetic energy weapon, this is the directest produce the medium that undertakes physics is atttacked effectively to the satellite. Be in early 2007, china already successful research and development experimented to counter satellitic missile, the missile of fuel of solid of a multistage that by Xi Changwei astral emissive center fires, successful with every second 5 miles speed destroys a target, after destroying fragile piece can be opposite all round the satellite of place causes harm. In addition, russia also is had turn over satellitic missile technology.
2, the interference that is aimed at GPS and electronic deceit, the atomic clock of the high-grade that GPS satellite place deploys, be disturbed extremely easily, or be concealmented technical destruction. Be being disturbed among them is to make the server breaks down directly, and what deceit points to is to use receiver of misdirect of a few technologies to make its cannot issue accurate information. Attack of this kind of deceit is to use wrong signal to come misdirect GPS receiver, still can use different time and area to give out correct signal to cause spatio-temporal and unbalanced deceit signal in addition.
3, the network makes a surprise attack, the network cannot leave between GPS system and satellite, it is civil network or system of for military use no matter, these network systems are destroyed extremely easily, thereby Yong Xiangjun thing acts.
4, climate influence, when telecommunication satellite is accepted to the earth and issueing radio signal, these radio signal are in reflex going there and back, encounter extremely harsh thunderstorm weather, can bring about loss signal, because this climate is having very main effect.
5, metallic electromagnetism, GPS signal can be absorbed by the metal and reflex, if GPS receiver is in,a large number of metals and electromagnetic area are used, the meeting is greatly abate its efficiency.
