Iridum gains 23 launches per year with 100% success rate in the past 12 months, a satellite manufacturing pipeline with 6 satellites produced and launched, and a cost-to-orbit of $25K/kg operational (with an in-development design targetting $4K/kg).
They are late compared to SpaceX, to be sure:
150 launches per year, 2400 satellites manufactured per year, $3K/kg operational with F9, target $200/kg in development with Starship.
We know from the graveyard of companies that reached orbit with their small rockets and ran out of funding before they got to be reliable, that reliably flying even a small rocket is pretty good.
> Rocket Lab has secured commitments for a $3.6 billion bridge loan from Deutsche Bank and Wells Fargo to fund the cash portion of the acquisition.
Given the timing, this seems like a risky move as they'll be issuing debt in mid-2027 to refinance the bridge, at a time the market could be saturated / corrected.
A profitable satellite company with a lot of debt and satellites that target the previous model of bespoke terminals when the market is moving to satellite service on regular phones.
> the market is moving to satellite service on regular phones.
I don’t think there a unified “market” here. The fixed rooftop terminals and fixed-ish roaming terminals use high (tens of GHz) frequencies with correspondingly wide bandwidth, have excellent beamforming capabilities and some degree of MIMO to improve spectrum reuse, and consume an amount of power that would be outrageous for a phone. Phones don’t have reliably clear views of the sky and have much weaker RF capabilities.
Oh, and phones are well served by existing 4G and 5G networks in dense areas, with better spectrum reuse than seems practical for a satellite constellation.
I expect that we will actually see two separate markets that happen to share the same satellites and backhaul.
They didn't circumvent phone antennas being largely omnidirectional (unlike VSAT or phased arrays, which are highly directional) and as a result having much lower gain, they just work with it, just like Iridium, Globalstar, Inmarsat, Thuraya, and all the other early players in what's now called "direct to device".
The market is as bimodal as ever on the device side: On one side, you have small, battery-powered, (mostly) omnidirectional device antenna, portable devices that mainly operate in the L-band, which works much better in these conditions; on the other side, you have highly sophisticated, steered, high power (dozens of watts) antenna arrays operating in the Ku or Ka band.
On the satellite side, both can be served by the same satellites, as has been the case for e.g. Inmarsat's I-6 series and Starlink's direct-to-cell capable satellites (I believe these all include Ku-band coverage as well).
Well they've circumvented the need for dedicated hardware to achieve NTN on unmodified UE, ahead of any such implementation in the 3GPP specs. The incumbents all rely on dedicated proprietary platforms - not an off-the-shelf Android SoC smartphone which represents the target-device in the developing world
Traditional 5G UEs are inherently size-bound in terms of supporting device-side beamforming at any performant level, so you're limiting the Starlink style Ku-band spectrum sharing through spatial multiplexing afforded by their directional arrays. No argument there.
ASTS are tricking a NTN connection by fooling an unmodified 5G UE into thinking it's connecting to a terrestrial gNodeB, and then handing it off using bent-pipe architecture to the various terrestrial serving gateways. They claim to have flipped the dependency to allow their proprietary phased array satellites to do the heavy Tx/Rx lifting, and have some Doppler Compensation secret sauce to fix the issues on the terrestrial side.
I suspect that the lack of ability to form nulls in the beam is as big or even a bigger limitation than the reduction in gain when going from a big array to a phone.
The SNR in Shannon’s Law has a log in front of it, but spectrum reuse is more or less linear. If there are five visible satellites and I can null out four of them, then I can receive from and transmit to the fifth without substantial interference. (I’m not saying this is easy! Contemplate how many WiFi generations have had MIMO and how limited it still is.)
So I believe that it’s comparatively straightforward to demonstrate a shiny new direct-to-cell system with a single phone on a stage, but achieving usefully large aggregate bandwidth in a dense area will be more challenging.
FWIW the problem with Iridium, historically anyway, was that available bandwidth was very low, so they had to charge a silly amount for usage of that bandwidth, so very few people used it. Iridium used low-ish frequencies, with narrow bandwidth, and (I think) no MIMO whatsoever, not even polarization diversity.
Yes, for more than one satellite covering the same area on the ground with a spotbeam on the same frequency at the same time to make sense, you inherently need steering/beamforming.
That's why Iridium has the constellation planned out so that you never have more satellites in the sky than strictly necessary for full coverage on the equator (where satellite density is lowest), and outer spot beams get turned off progressively as the satellites approach the poles as they'd only create interference without increasing bandwidth due to the lack of terminal-side steering.
Now I wonder if they already changed that for the second generation sats, given that there are some steered terminals available that could probably make good use of the extra satellite density near the poles, which is also an area underserved by geostationary beams?
Kind of: Phones will probably need some Iridium-specific RF hardware (unless their existing baseband and amplifiers happen to cover the band it uses), but the baseband and signaling stack won’t be proprietary anymore if I understand it correctly.
Several mass-market phones already are IoT-NTN compatible, e.g. Google’s Pixel line.
Iridium has historically targeted low-power, omnidirectional terminals (antennas can be larger at lower frequencies without requiring steering than at higher frequencies).
They recently had some forays into steered, high-bandwidth antennas with their Certus line and their second-generation satellites that now allow native packet switching (the first gen was circuit-switched at 2.4 kbps only), but that brings you into the bandwidth-limited regime, and is honestly just a waste of scarce L-band spectrum and much better served by all the Ku- and Ka-band LEO competitors.
It's going to be interesting to see if Rocketlab start also serving that market, like some of their main competitors already are.
> They recently had some forays into steered, high-bandwidth antennas with their Certus line and their second-generation satellites that now allow native packet switching (the first gen was circuit-switched at 2.4 kbps only), but that brings you into the bandwidth-limited regime,
This is AI slop?
No, the point of using an electrically-steered beam antenna is that it improves SNR, so that you are not bandwidth limited.
> 1. Iridium uses frequencies fairly close to GPS (~1.6GHz).
2. Iridium uses cylindrically-polarized transmissions (like GPS), which enable compact omnidirectional helical antennas
Which part of my argument is this an objection to?
Are you saying that using circular polarization, the same would be possible in the Ku or even Ka bands? Because that’s definitely not the case due to the different aperture/gain tradeoff vs. L-band, and that’s my point.
> This is AI slop?
Did I say anything incorrect there or do you just not like my writing?
> No, the point of using an electrically-steered beam antenna is that it improves SNR, so that you are not bandwidth limited.
Sure, but my point was: At low frequencies, you can steer to become more efficient per bit, but at high frequencies you almost have to, as you’re sending energy in suboptimal directions otherwise. And then if you’re already steering, why not use a less-scarce band?
I'm not sure if that kind of great replacement theories stand anymore. That happened once with iPhone, and... what else? All the direct-to-cell stuffs are limited to simple texts as well. IIUC they require the phones to be out in the wild with nobody around and patient with the rituals of sending messages, like how earliest forms of GPS receivers worked. I don't see that changing that much in coming few years.
They are late compared to SpaceX, to be sure: 150 launches per year, 2400 satellites manufactured per year, $3K/kg operational with F9, target $200/kg in development with Starship.