It's way too soon to say it didn't "take off". Chipsets haven't been available to integrators for that long. Maybe 1-2 years for non-early access customers? Plus, if you're judging success by looking at the consumer market, you're going to be disappointed. The target market is industrial manufacturing.
The processing that goes into the phosphor and waterfall displays is usually overlapped FFTs, which is also the processing for a lot of common channelization techniques. So yes, probably not so much in the commercial space, but certainly very useful. In fact I'm aware of platforms that don't even store/manipulate I/Q data, but the overlapped FFT data since it's usually much more useful as a starting point.
I've actually been a victim of something similar. Visiting a state park I followed a random popular trail I found on All trails. It turns out it was popular because it took rock climbers to the face of a rock wall up a steep sketchy slope. By the time I looked behind me I realized I was in "slip and hopefully not die" territory. In retrospective it's funny how much faith I put in the All trails map and trudged on before I had the wherewithal to turn around. As someone with a lot of hiking experience it was a humbling lesson to learn. It also didn't help that I have experience rock climbing, I think I was on auto pilot while scrambling, which probably would have made others pause sooner.
In SATCOM, the link budget determines everything. In the link budget equation is the gain of both the receive and transmit antenna. If your phone antenna has a small gain (for a cell phone, you can consider it 0dB gain), then it has to be made up somewhere, and in this case it's on the satellite. The newer Starlink satellites have higher gain antennas for this use case. Despite this, the throughput is still quite low. The link budget equation results typically in a CNR value which provides you a budget for actual bandwidth/throughput. With a 0 gain ground antenna, there is only so much a small form factor satellite antenna can make up for. The satellite antennas also are phased array antennas which allow for beam steering which is another key technology here. As the satellite rapidly moves over the land it has to be able to maintain high gain in the direction it needs. A fixed antenna would either have a high gain in a single direction requiring lots more satellites for full coverage or wide beamwidths resulting in lower antenna gains and overall lower bandwidth/throughput, potentially to the point of uselessness.
It starts to get better between 6-12 months. They will sleep ~12 hours at night (mostly solid), about 2 hours of naptime per day, and can start doing better playing by themselves for periods of time. Combined with having grandparents watch the baby several times a week, 20+ hours of free time a week is pretty much guaranteed.
Yes of course, but anybody doing anything non-trivial is selling it to the government and not writing about it online. Using the spectrum or waterfall as the input to an RFML system is very common and in my experience works pretty well. A lot of systems also train on I/Q data. Usually these systems are designed to be trained on signals that are relevant to a specific mission. So a product might look like both a platform for annotating and training a model as well as deploying it, usually as a plug-in into a separate expensive SIGINT platform. The biggest products I'm aware of aren't even advertised and last I heard cost in the six figures.
Yes, essentially radar. Wifi is the medium because you already have a router in your home.
This sort of capability is being introduced into the newest WLAN standards and is being promoted as the next step towards smart homes and devices. The idea being that a standard router can be used to detect human presence, and therefore do things like turn on/off lights, HVAC, etc. This might make even more sense in the commercial space.
This would be as far as I'm aware the first attempt at doing something like this without additional hardware (mounted sensors). It should in theory lower the barrier to entry even further.
There are higher frequency variations of this that could in theory do things like detect breathing. Some people are talking about it being like the new lifeline button or baby monitor.
How well it's implemented will ultimately determine it's usefulness IMO.
You will come across Hilbert transforms in a signals and systems or DSP course, which you would take in an EE/ME undergrad. A lot of the work in this space was done by mathematicians which I think contributes to the abstraction level at which it's taught. It can be useful and is definitely real.
Thankfully that's not the real price. The real price is a fraction of this, and any serious outfit will negotiate quantity discounts to a tenth of that price. Assuming Xilinx can even get you the part...
Yea, I read that. I think that's a negative outlook. How many of those customers are sympathetic and would re-up at a new subscription rate? How many sympathetic new subscriptions could be generated? Refund current outstanding subs, and start a new sub, never take a hit. I mean, don't get me wrong, they can do whatever they want, it just doesn't seem like the dead end they make it.
Maybe I missed it, but why not just increase Apollo subscription rates to match the new pricing? It sounds like Apollo has a huge following that would be willing to support it. Take advantage of the hate train, tons of people would donate through a subscription model. It also sounds like these third party apps provide much better moderation interfaces, that could a selling point for the rates. Even if your subscriptions drop, it's still profit. I'm sure someone would be willing to do this, I don't understand the reason for not wanting to sell the app either. To me it sounds like the Apollo developer is undervaluing their position.