minetest2048
Joined 7 years ago
Joined 7 years ago
Brad Parkinson, the father of GPS and PNTAB, they've been trying to lobby the US government to remove ITAR from that technology so the civilian can benefit from anti jamming, and finally they managed to do it sometime last year. Now it falls under EAR
- This study is the source of LinkedIn ads from climate change where they try to convince people to move from gas to electric because of bad health effects
- But it doesn't invalidate the study, because of course burning something indoors creates some sort of emission, which may causes asthma in kids
- But its not relevant for me because I'm a single adult not a child and I don't cook that much anyway
- And even when I used to have a gas stove, I used my induction burner more often as its more powerful and makes less waste heat compared to my gas stove
- and the reason I bought an induction wok burner from aliexpress, it can go much hotter than my gas stove
- But one thing that gas stoves excel is even the cheapest gas stoves have a smooth analog control, making it possible to gently heat things, which is important for cooking omelette. For the induction burners I have, it uses on off control, which will scorch the food if your setup (food + cookware) have low thermal mass to smooth it out. You think with the advancement of power electronics because of EV, ebikes, drones and AI data center power supplies someone is able to make a cheap induction burner with analog power control
That plain text looks like what a software GNSS receiver outputs as its very verbose, and this paper: https://radionavlab.ae.utexas.edu/wp-content/uploads/2022/10... , a paper about a software receiver mentioned this:
> PpRx has been licensed through the Radionavigation Lab to multiple commercial companies, but notably a major aerospace company that uses the technology across their suite of advanced spacecraft and satellites. The SDR is deployed across the company’s mega-constellation of satellites used for broadband Internet
Yeah no, your language will be DOA if you don't have bit twiddling, because you can't write arbitrary binary file parser / writer without some sort of bit manipulation.
Even matlab have bit twiddling function
Another example is high frame rate thermal camera, US companies are banned from exporting cameras above 9 fps, while chinese companies freely sells 50 fps cameras
1. Public ephemeris from space-track (celestrak) is notoriously inaccurate after a while. Less of a problem for starlink as they give free access to high accuracy ephemeris from their onboard GPS receiver: https://starlink.com/satellite-operators
2. For proprietary signals like starlink they can change signals whenever they want without telling you and break your positioning algorithm. For example, starlink used to transmit some sort of narrowband CW wave at their frequency band, which can be received by cheap ($20 ish) RTL-SDR dongle and satellite TV antenna: https://www.rtl-sdr.com/receiving-starlink-signals-with-an-r... . Everyone speculates that its a beacon signal, research papers were written trying to exploit doppler positioning from those signals. Then the signal disappears, as its possible that they don't intentionally transmit those signal. They you can't use cheap hardware to capture the signal, you need expensive hardware that can capture the full 250 MHz bandwidth. This is not a problem if you use standardized signals where they can even intentionally add positioning signals like 5G or digital TV
- You need stable clock for the processing algorithms to be happy, RTL-SDR blog dongle have 0.5ppm TCXO while who knows what crystal they use on the no-name ones
- RTL-SDR blog dongles have bias-T, and a lot of GPS patch antennas are active antenna that need power from the coax to power the LNA