Цитата: Ilya Kaiten от 07.05.2018 22:24:02Ну и кое-кто БПЛА за пол шарика как-то отправляет. Или это их расовая магия нам недоступная?
Это продвинутые спутники нужны. Дорогие очень. Чуть ли не сотни миллионов за штуку, вроде. Ну и аплинк на БПЛА.
Вроде у США есть индустрия спутников связи, что
в целом окупается за счёт и не военного использования нихрена не окупается, но деньги они печатают, поэтому могут себе позволить. Так же, как с авиапромышленностью.
•Wideband Global Satcom (WGS) system: The WGS satellites are becoming the key spacecraft for command of UAVs. The WGS program cost for the
six satellites is about $2 billion. Each individual WGS has more bandwidth than the entire Air Force Defense Satellite Communications (DSCS) constellation in use since the 1980s.
Upon its launch into geosynchronous orbit in 2007, the first WGS vehicle became the Pentagon’s highest-capacity communications satellite. Two additional WGS satellites were launched in 2009, while satellites 4, 5, and 6 are anticipated for launch in 2011, 2012, and 2013, respectively. Both the Delta IV and Atlas V rockets are being used to launch the constellation.
WGS has 4.75 GHz of instantaneous switchable bandwidth, thus each WGS can supply more than 10 times the capacity of a DSCS III spacecraft. Each WGS is able to downlink 2.4 Gbps of data to tactical users. The new wideband constellation is also taking over the Ka-band service provided by the Global Broadcast Service (GBS) a high data- rate one-way link piggybacked onto several Ultra High Frequency UFO satellites launched in the 1990s. The WGS Ka system is used to ship key UAV-gathered intelligence imagery to hundreds of 18-inch diameter antennas that can be carried in the rucksack of any soldier or Marine.
•Advanced Extremely High Frequency (AEHF) constellation:
The $12.4 billion cost of the four-satellite constellation illustrates the complexity and capability of these U.S. Air Force satellites to provide highly secure, encrypted communications to the National Command Authority and many other military users like UAV operators. The satellites will combine the capabilities of the Milstar and DSCS constellation. UAV data will be routed by special Advanced Beyond-Line-of-Sight Terminals developed for the AEHF program. Built by Lockheed Martin and Northrop Grumman, the first AEHF spacecraft is set for launch from Cape Canaveral by late summer 2010. Each satellite will be able to crosslink with its neighbor AEHF satellites. They will provide 10 to 12 times the overall communications capability and a data rate six times higher than the 1990s-era Milstar II constellation that the AEHF program will replace.
•Mobile User Objective System (MUOS): Managed by the Navy, the MUOS program was originally to be operational in 2010, but will be delayed until at least September 2011, when the first Lockheed Martin satellite is to be launched. The program’s total cost is estimated at
$6 billion for 10 spacecraft across the 20-year life of the program until 2030. The spacecraft will unfold 16-foot diameter and 50-foot diameter antennas developed by Harris Corp. It also will carry a Lockheed Martin-built wideband code division multiple access payload that will provide a 16-fold increase over legacy UHF satellite capability. These will support new mobile satellite terminals that are under development within the Joint Tactical Radio System. These will support UAV operations.
6 спутников за 2 миллиарда... 4 спутника за 12.4 миллиарда, 10 за 6 миллиардов... Россия не сможет себе такое позволить. Отсюда, кстати, один из ответов на вопрос, куда янки девают такой огромный военный бюджет. Вот куда.
Не знаю, тяжелее ли давить спутниковую связь. С одной стороны, дальность между приёмником и передатчиком больше. То есть легче. С другой, спутниковая антенна на БПЛА смотрит исключительно вверх и наверняка плюёт с высокой колокольни на всё, что пытается давить с земли и сбоку. То есть, тяжелее.