Inventions That Changed The World: GPS

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Күн бұрын

In 1977 or thereabouts a collection of scientists huddled around a secret radio receiver in the US desert. This was the start of GPS, Glonass, Gallileo and the whole navigation industry. A GPS chipset now costs, in bulk, a few dollars so your watch, your phone, your computer all have GPS receivers and everyone knows where they are all the time. But how does this technology work? And are there situations when it does not work?
A lecture by Richard Harvey
The transcript and downloadable versions of the lecture are available from the Gresham College website:
www.gresham.ac.uk/lectures-an...
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Пікірлер: 12

@dianespears6057 Жыл бұрын

It is a pleasure to listen to someone who so clearly loves their subject matter. I personally am not engineering inclined, but I could follow the important points.

@fredhoysted 2 жыл бұрын

Correction for info at 7m 08s - radio waves travel at about 300,000 *kilometres* per second, not metres per second

@richardharvey8354 2 жыл бұрын

Absolutely right. I would always normally say ‘three times ten to the eight metres per second’, m being the SI unit. And for some weird reason I decided that km per second was more convenient and got it wrong. Thanks for noticing!

@stephenmatura1086 2 жыл бұрын

The thing I find fascinating about GPS is the fact that the satellite clocks have to be offset to account for General and Special relativity.

@richardharvey8354 2 жыл бұрын

Yes that’s right. In fact there is so much fascinating detail in GPS that it could easily occupy five lectures, and add another ten if we were look in detail at GNSS. There are a few tutorials on KZfaq but several of them are now quite out of date so one has to flick between the tutorial and the GPS website to get the full picture.

@elizabethjohnson7677 2 жыл бұрын

Very interesting talk, Professor Harvey. My understanding is superficial, but I enjoy the enthusiasm in you voice for your subject matter.

@0nickers0 Жыл бұрын

excellent presentation... I've been enlightened on many new levels 😊

@tonyjones9442 Жыл бұрын

I'm just a layman who uses GPS on my phone for OS maps etc. Decided to watch this video as I was bored on Saturday afternoon. I understand with the Chinese GPS its two way, they know where you are! Do you think the uk will ever produce its own GPS system? (I'm welsh) Very interesting, thankyou.