SpaceX, a space launch service provider, is preparing to test its star chain network in polar regions of Alaska, South Carolina and Tennessee. SpaceX is busy building satellite constellations in low earth orbit (LEO). It plans to launch satellite chain satellites soon and use funds from the network to fund the construction of ultra heavy launch vehicles to promote deep space exploration. < / P > < p > in its submission to the FCC International Bureau, SpaceX highlighted plans to extend the star chain test to three other states in the United States. The company obtained permission from the agency in July to test its ground stations in six states, and in July and August it received approval to test in three other states. < / P > < p > through these tests, SpaceX intends to verify the uplink and downlink capabilities of its ground stations. These ground stations are part of the three basic components on which network connectivity depends, especially before the first generation satellite chain is populated. To enable users to connect to the satellite Internet, SpaceX will provide them with terminals to forward data to spacecraft in orbit. Then, the satellite will transmit the data to the user terminal to complete the link between the satellite chain user and the Internet server. < / P > < p > in the second generation satellite chain, SpaceX will partially eliminate the need for these ground stations. The company intends to achieve this through intra optical (laser based) communication between satellites, for which it has confirmed that the function has been tested on two satellites, and a large amount of data is being transmitted between the two satellites. < / P > < p > as in previous tests, SpaceX will use 17, 18 and 19 GHz spectrum for downlink communication and 28 and 29 GHz spectrum for uplink communication with satellites if SpaceX is approved to conduct satellite link tests in Tracy, Tennessee, South Carolina, and kupaluk, Alaska. < / P > < p > although this test is routine for any network pre launch preparation, SpaceX will be able to test the star chain in Alaska once this special application is approved. In this state, the company hopes that if it is allowed to change the key orbital parameters of its satellite constellation, the delay (the delay in the transmission of Internet signals back and forth from the server) will be less than 50 milliseconds. These changes include altitude reduction, track plane and track inclination. < / P > < p > specifically, in the modification, SpaceX increases the inclination of satellite orbit, which will make it better serve polar regions including Alaska. These angles are taken with reference to the equator, and the angles in the range of 90? Mark the orbits serving the polar regions. < / P > < p > ground stations will use beam steering technology with phased array antennas to communicate with satellites. Details revealed in a patent granted by the U.S. patent and Trademark Office (USPTO) for a ground station antenna earlier this month show that the antenna elements will be managed by a controller that will decide to turn the antenna on or off relative to the signal strength of the satellite it is communicating with. The controller will also use global positioning system (GPS) to determine the position of satellite chains in orbit. SpaceX’s application to the FCC also confirmed that the company still plans to launch the network commercially later this year. It has obtained FCC approval for Internet service wireless routers and plans to launch at least 120 satellites into orbit each month. Global Tech

By ibmwl