HmmmCloud services seeking global low latency private networks.
Quote from: oldAtlas_Eguy on 04/06/2019 02:31 amHmmmCloud services seeking global low latency private networks.Simple example being Google's Stadia streaming game service which is latency sensitive, but other latency sensitive cloud services beyond HFT such as advanced AR (which many say hinges on 5G low latency) is another point.
Another article on constellation. Nothing new just some industry experts comments. https://www.cnbc.com/2019/04/05/jeff-bezos-amazon-internet-satellites-4-billion-new-customers.htmlIMHO I don't think Amazon is targetting domestic customers. More likely they are building secure low latency network for their data centers and big customers. Domestic customers would be nice bonus revenue but not critical to business plan.Who builds satellites is another big question. Does Amazon setup their own factory, buy existing manufacturer or contract work out?.
Kuiper Systems LLC requests authority to launch and operate a non-geostationary satellite orbit system using Ka-band frequencies.
New FCC License QuoteKuiper Systems LLC requests authority to launch and operate a non-geostationary satellite orbit system using Ka-band frequencies.
The Kuiper System will consist of 3,236 satellites operating in 98 orbital planes at altitudes of 590 km, 610 km, and 630 km. The Kuiper System will be capable of providing continuous coverage to customers within approximately 56˚N and 56˚S latitude serving the continental United States, Hawaii, U.S. territories, and other regions of the world. Service rollout will begin as soon as the first 578 satellites are launched. Coverage begins at 56˚N and 56˚S latitudes and quickly expands toward the equator as more satellites are launched.
Kuiper Systems LLC is a limited liability company organized in Delaware and wholly-owned by Amazon.com Services, Inc., a Delaware Corporation. The principal office and business address of Amazon.com Services, Inc. and Kuiper Systems LLC is 410 Terry Avenue North, Seattle, WA 98109-5210.
During deployment, full-time commercial service will initially be available between 39°N-56°N and 39°S-56°S latitudes. The Kuiper satellites use advanced phased array antennas with multiple user beams. The antenna technology and software-defined control functionality allow flexible frequency and capacity allocation depending on the needs of customers within a given region. A separate set of antennas on the Kuiper satellites communicate with gateway earth stations. The use of high gain, steerable and shapeable phased array antennas, operation at low orbital altitudes, supports virtual spots of approximately 300 km2 (or a radius of just under 10 km). A larger user beam of approximately 500 km2 (~2dB reduced in directivity) may be used in cases where larger spot-beam sizes are needed for coverage. The beams from the satellites in the 590 km and 610 km shells will be adjusted to approximately match the beams from satellites in the 630 km shell. User beams from the satellite are only supported for customer terminal elevation angles above 35°. Both gateways and satellites use an additional antenna to support handoff to the next gateway link...Each gateway site will have up to four active antennas per site and all antennas can make use of all gateway frequencies and both polarizations. The number of United States gateways sites will be approximately equal to the number of active satellites serving U.S. territory.The coverage area for Kuiper satellite gateway beams extends further than that for user beams. Each satellite operating in the 630 km shell can connect to any gateway earth station (subject to availability and traffic constraints) within 58° from nadir corresponding to 3,200,000 km2 gateway coverage area below each satellite. Mechanically steered, reflector antennas will be used for satellite communications with gateway earth stations for uplink and downlink beams.
Amazon has designed the Kuiper satellites and the processes for deployment and operation of the Kuiper System so that no debris will be released during normal deployment and operations. The satellite design goal is to use unpressurized non-explosive propellant storage. No hypergolics or explosive actuation devices will be used and the propellant will be chemically inert.The production satellite will be dispensed into an orbit safely below the International Space Station (“ISS”) and individually checked out to validate nominal performance of all systems. Any aberrant satellite will be deorbited. After successful checkout, collision avoidance procedures will be initiated before and continue throughout orbit raise,Kuiper satellites will actively decommission and deorbit within one year after the active mission lifetime. While decommissioning, all satellites will continue to perform avoidancemaneuvers in consequence of ongoing conjunction assessment plans, maintaining the same high standards as during the mission operations phase. Own-ship ephemerides will also be made available throughout the lifecycle, to the 18th Space Control Squadron (SpCS) and civilian SSA clearinghouse organizations.During active deorbit, a Kuiper satellite’s perigee will be lowered to below ISS to assure rapid demise. The satellite’s apogee will then also be lowered below ISS. During these orbit lowering maneuvers, conjunction avoidance will be active. After the final orbit-lowering stage, de-energization of onboard systems will be initiated, followed by reentry and demise. Total duration of active deorbit will be less than one year.
While document gives details on end of life deorbiting of active satellites, doesn't say how they deal with dead satellites. There are going to be a few dead satellites given size of constellation.
Amazon has also considered the Commission’s Notice of Proposed Rulemaking onMitigation of Orbital Debris in the New Space Age in selecting the Kuiper System’s constellationaltitudes to ensure that satellites will passively deorbit in under 10 years (typically 5-7 years). Atthe densest projected ballistic coefficient, and average sunspot activity, the following trajectorypredicts 6 years decay time for satellites in the 630 km shell.
They could be using water for propellant. "The satellite design goal is to use unpressurized non-explosive propellant storage. No hypergolics or explosive actuation devices will be used and the propellant will be chemically inert."While document gives details on end of life deorbiting of active satellites, doesn't say how they deal with dead satellites. There are going to be a few dead satellites given size of constellation.
Quote from: TrevorMonty on 07/05/2019 07:51 pmThey could be using water for propellant. "The satellite design goal is to use unpressurized non-explosive propellant storage. No hypergolics or explosive actuation devices will be used and the propellant will be chemically inert."While document gives details on end of life deorbiting of active satellites, doesn't say how they deal with dead satellites. There are going to be a few dead satellites given size of constellation.Or tetrafluoroethane.
I'd be interested in seeing metal stored as a solid used in ion drives. I've no clue if this could make a good propulsion system but being able to "paint" debris with "ferromagnetic" paint strikes me a a great way to take advantage of Earth's magnetic field to deorbit debris without having to physically contact the trash.More realistically I expect the plan is passivization by venting tanks. These might be low pressure tanks if technology like Purdue's FEMTA thruster is good enough, but pressure it is.
