What element can affect north to fight satellitic service life?
A satellite that flies in aerospace can get the influence of the following elements:
1, because the satellite is,in distance earth closer place flies, because chafe with air,meet likely so, final rate is slower and slower, fall afresh below gravitational action next aerosphere.
2, because the satellite is in-house those who because happen in aerospace,meet is accident or the blemish of itself product, sporadic breakdown, these breakdown if cannot quite seasonable rehabilitate, with respect to the life that can affect a satellite.
3, the spare parts of itself satellite will be ceaseless because of the influence of outside space environment loss (meet e.g. batteries ceaseless ageing) , and any products produce itself the metropolis in coming out to using a process is ceaseless ageing and ultimate be no longer in force.And fight to north for, its move in " in earthly orbit " on, this orbital height is taller (the comparative plan of the height that north fights a satellite and other satellite altitude can be as follows plan institute is shown) , the air on the moving path that fights a satellite in north is already special and rare, almost negligible not plan, so the first element affects the life that north fights scarcely.
About at 2 o'clock, newest north fights 3 satellites to had had ego rehabilitate function, that is to say once the satellite appeared breakdown, whole system can detect automatically problem, and try ego rehabilitate. There can be spare part above the satellite namely additionally, deploy many atomic clocks e.g. the meeting on the satellite -- this spare parts is navigation satellite is the most important, make sure a part is bad so, the satellite is attempt rehabilitate, can not enable spare parts all right really. In this respect, what north fights 3 to be able to have been done is very good.
And the element that 3 o'clock also is a special key, also be the main factor that restricts satellitic life, inevitable.
So how long does north fight satellitic life to have?North fights newest model of the satellite, north fights 3 design life is 10 years, that is to say, each north fights a satellite to want the job only full was contented design 10 years to ask -- but actually satellitic service life should compare this time more a few longer. About north fights 3 working hours to be able to achieve 10-12 year.
Such design life and high reliability are very advanced in the world, the life of GPS satellite design of inchoate United States has 7-8 only year, lengthen the left and right sides later, the satellite meets newest nevertheless the 3rd acting GPS to prolong design life. Because this China is on navigation satellite life, still need to be chased then. (next graphs are newest the 3rd generation American GPS satellite)
Also just said, the meeting in aerospace encounters various accidents, if there is navigation satellite bad how should do?
Above all, satellitic itself is met ego rehabilitate -- this thereinbefore also was mentioned. Another, the north that flies in sky namely fights satellitic measure is the navigation satellite amount that prep above needs actually, once,can assure so some satellitic occurrence problem, but use other satellite to still can continue to provide signal of fixed position navigation.
According to the design, the dependability that north fights satellitic navigation system is to be interrupted every year 0.4 times, meaning that is to say, two years half ability produces the situation of invalidation of signal of satellitic fixed position likely. Should for be to satisfy use requirement far.
