Your work is truly awesome. You make it interesting. Thank you very much.

@pauldenisowski

25 күн бұрын

Thank you - it is a labor of love :)

Great fundamentals video on GPS. Once again, nice job Paul.

@dabdoube92

4 ай бұрын

I don't know who Paul is, but yeah well done Paul !

You guys make the fundamentals amazing! Awesome video...

@pauldenisowski

8 ай бұрын

Thank you!

Thanks for the video, I understand now how the gps (and others) system works.

@pauldenisowski

3 жыл бұрын

Thanks for the feedback! Glad it was helpful

Great video. Very informative.

@pauldenisowski

Жыл бұрын

Thank you!

Thanks for the video. Can you explain that how the phase center measurement error of the GNSS antenna can affected the accuracy of detection the exact position?

@pauldenisowski

3 жыл бұрын

I can try :) As I'm sure you already know, the phase center of a GNSS antenna is different from the actual physical center of the antenna and this is concern in applications that require extremely high position accuracy. The difference between the phase center and physical center changes based on numerous factors such as the position of the SV (azimuth and elevation) as well as the frequency of the received signal (e.g. L1 vs L2 vs L5 in GPS). In order to minimize this error, calibration of the GNSS receiver antenna can be used. One way of doing this calibration is by sending signals into the antenna at various azimuth and elevation values (in a shielded chamber or at an open air range) and using a vector network analyzer to measure and record the phase differences so that these can be removed in the final navigation solution. Hope that's helpful!

So if the code is used to determine positioning, why is precise timing via atomic clocks required for PNT? Is it just for accurate timing, (the T in PNT)?

@pauldenisowski

Жыл бұрын

The short answer is the GPS is really about timing, not positioning :) Position is determined (by the receiver) based on the time it takes the signal to travel from the well-known positions of multiple satellites to the receiver. Most people tend to think about GPS as providing a "position", but I would say that most (behind-the-scenes) applications of GPS are really more about having a precise time source.

🙏🙏🌹🌹

How do you get the "length" of the code in meters?

@mohandt.6469

Жыл бұрын

lambda = c/f

I always tought that L1, L2, L5... referred to L-band 1, L-band 2, etc. The L-band refers to the 1 - 2 GHz spectrum,

@pauldenisowski

8 ай бұрын

If you read the US government ICD's for GPS (e.g. IS-GPS-200), you'll see they are using "L" to abbreviate "link", e.g. "GPS for radio frequency (RF) link 1 (L1) and link 2 (L2)." GPS is in the L-band, but that's not where the abbreviation comes from :)