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  • Post published:14/09/2021
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Illustration of the Earth with the logo of Starlink, the satellite broadband service planned by SpaceX.
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SpaceX

SpaceX says that Starlink user terminals for moving vehicles will be ruggedized to withstand “harsh environments” with extreme levels of heat and cold. SpaceX has been seeking Federal Communications Commission permission to deploy terminals on moving vehicles since March and provided new details on its plan in an application filed Tuesday.

Compared to Starlink satellite dishes deployed at homes, the new Earth Station in Motion (ESIM) “has been ruggedized to handle harsher environments so that, for example, it will be able to continue to operate at greater extremes of heat and cold, will have improved snow/ice melt capabilities, and will withstand a greater number of thermal cycles,” SpaceX told the FCC.

The standard Starlink user terminals go into “thermal shutdown” once they hit 122° Fahrenheit, which has caused outages for some beta users. While ruggedized terminals for moving vehicles won’t solve the problem for home-Internet users, SpaceX will presumably try to make the next version of its home terminal more resistant to heat and cold.

The ruggedized terminals for moving vehicles “will operate with higher gain and lower transmit power (thus maintaining a consistent EIRP [effective isotropic radiated power] compared to other SpaceX Services user terminals)” and “will communicate with those SpaceX satellites that are visible on the horizon above a minimum elevation angle of 25 degrees,” the filing also said.

SpaceX CEO Elon Musk has said the terminals for moving vehicles are intended for aircraft, ships, large trucks, and RVs. The terminal is “much too big” for Tesla cars or similarly sized passenger cars, he said.

SpaceX seeks waiver

SpaceX needs a waiver from the FCC to use the 12 GHz band for the ESIMs because “this spectrum is not specifically listed among the bands available for ESIM operations,” the company’s application said. In a previous ESIM proceeding, the FCC “concluded only that the record was not sufficient at that point to include the band, not that ESIM operation would cause any technical impediment to other authorized uses in the band,” SpaceX wrote.

SpaceX said it recognizes that its ESIMs must use the 12 GHz band “on a non-protected basis” without the protection given fixed-earth stations, so the moving terminals have to accept interference from satellite TV services and the ground-based MVDDS (Multichannel Video and Data Distribution Service). “However, the commission has recognized that allowing satellite operators to make opportunistic use of spectrum on an unprotected basis provides operational flexibility and more intensive use of spectrum without compromising service to customers,” SpaceX wrote.

SpaceX said that ESIMs will be installed “on vehicles, vessels, and aircraft by qualified installers who have an understanding of the antenna’s radiation environment and the measures best suited to maximize protection of the general public and persons operating the vehicle and equipment.”

Arguing that its application serves the public interest, SpaceX said the ESIMs “will expand the range of broadband capabilities available to moving vehicles throughout the United States and to moving vessels and aircraft worldwide—and most particularly, to those in challenging environments where ruggedization is appropriate.”

SpaceX added that “users now require connectivity while on the move, whether driving an RV across the country, moving a freighter from Europe to a US port, or while on a domestic or international flight.” A company executive said in June that SpaceX is in talks with several airlines about providing in-flight Internet.

1,700 satellites and 90,000 users so far

Giving a general update on Starlink, SpaceX said that with over 1,700 satellites deployed so far, the “system is now on the brink of delivering [broadband] service across the entire United States—including to the most remote corners and polar regions of the country that too often get left behind.”

Starlink has about 90,000 beta users in 12 countries. Because of its use of low Earth orbits, “Starlink was the only satellite Internet provider with a median latency that was anywhere near that seen on fixed broadband in Q2 2021,” Ookla’s Speedtest site wrote in a new report. Starlink median latency was 45 ms, compared to 14 ms for fixed broadband connections in general.

Starlink’s median download speeds in the US were 97.2Mbps in Q2 2021, up from 65.7Mbps in Q1 2021, the report said. Starlink’s median upload speed was 13.9Mbps, about the same as in the previous quarter.

One problem for Starlink users is getting a line-of-sight connection to satellites in areas with tall trees or other obstacles. Satellite-industry consultant Tim Farrar this week pointed out that a SpaceX filing shows that in most of the US, the satellite serving a customer will be at less than a 40-degree elevation angle about half the time. “That will mean significant dropouts due to tree obstruction and high need for professional install,” he wrote.

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