it is not that expensive, China in fact is doing it.

The first ground station is operational now for testing purpose. The system is called ADS-B which replaces the current ARINC's ACARS. If I remember correctly ACARS covers most of the Chinese air space. ADS-B allows the terminal inside the aircraft to transmit the aircraft position obtained from GNSS (GPS, or other similar systems) to ground station. ADS-B used GlobalStar LEO sat which covers most of areas for communication rather then ACARS using GEO station sat. That means it is gonna be faster and safer. South Korean company helped Chengdu to set up ADS-B ground station. By 2020, Most of Europe and North America will transition to ADS-B. I don't know exactly what the deployment schedule for China is.

所有跟帖： 

• oops, I meant Korean government. -bi-elliptic- ♂ (38 bytes) () 04/02/2014 postreply 22:56:34

• 你怎么一会儿opps一会儿oops，是一个人吗？:) -霍人- ♂ (0 bytes) () 04/02/2014 postreply 23:04:25

• typo. I am not gonna proof read this kind of things all the time -bi-elliptic- ♂ (0 bytes) () 04/02/2014 postreply 23:06:07

• 没关系。昨天讲诗词平仄的是你吗？先生你文理双修啊。 -霍人- ♂ (0 bytes) () 04/02/2014 postreply 23:19:42

• 诗词平仄是中學的東西，我一向是理科的。 -bi-elliptic- ♂ (0 bytes) () 04/02/2014 postreply 23:24:32

• 嗯，看的出来。现在的中学国文教育可能没有你们早先那么扎实了。 -霍人- ♂ (0 bytes) () 04/02/2014 postreply 23:34:14

• 並不如此，我在香港大的，大部分香港學生的中文都非常差 -bi-elliptic- ♂ (74 bytes) () 04/02/2014 postreply 23:38:45

• 那你真係不错，现在也没忘，赞喔。要走先了 -霍人- ♂ (0 bytes) () 04/03/2014 postreply 00:05:17

• btw, Korea is the first test side in Asia I think, don't remembe -bi-elliptic- ♂ (74 bytes) () 04/02/2014 postreply 23:17:22