Reasons for Narrow xichang satellite launch center Launch Window

It's not too narrow. I can only say that the time of a certain launch is relatively narrow. Xichang satellite launch center still has advantages:

1, low latitude (28.2 degrees north latitude), high altitude (1500m), good launch inclination, short ground-air distance, lower latitude and closer to the equator, which can not only make full use of the centrifugal force of the earth's rotation, but also shorten the distance from the ground to the satellite orbit, thus increasing the effective load of the rocket.

2. The canyon has good terrain and solid geological structure, which is conducive to the overall layout of launch sites, the layout of ground launch facilities, technical equipment, tracking measurement and communication, and can meet the construction of multiple launch sites.

3. The weather is fine and the "launch window" is good. The annual average temperature in Xichang is 18℃, which is one of the areas with the smallest climate change in China. There are as many as 320 sunshine days, almost no foggy days, and there are many test periods and allowed launch times.

Generally speaking, the launch window mainly has the following constraints:

a.

Illumination conditions of ground targets (sub-satellite points) under solar flight (such as meteorological and resource satellites);

b.

Relative relationship between satellite solar panels and solar rays (requirements of solar cell power supply);

c.

The geometric relationship among the Earth, the satellite and the sun required by the satellite attitude measurement accuracy;

d.

Satellite temperature control requires that the sun can only illuminate some directions of the satellite;

e.

Requirements for the length of time the satellite is in the shadow of the earth (requirements for solar cell power supply);

f.

Requirements for landing recovery time (such as recoverable satellites and manned spacecraft). );

g.

Specific requirements for satellite orbital plane (such as mobile communication satellite constellation, orbital rendezvous, orbital interception, etc.). );

h.

Requirements for the relative position of the earth and the target celestial bodies (such as lunar probes, planetary probes, etc.). );

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Others such as ground tracking measurement conditions, meteorological conditions, etc.