Understanding GPS Links and Codes

This video provides an introduction to the different links and codes used in the Global Positioning System (GPS).

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Timeline:
00:00 Introduction
00:11 About links and codes
01:03 GPS link frequencies
02:04 Why have two (or more) link frequencies
02:49 About L1 and L2
03:30 What do we mean by “code”?
04:06 How codes are used
04:39 Cross-correlation between replica and received code
05:01 Effect of code length and rate
05:49 C/A (“coarse/acquisition”) code
06:52 P (“precision”) code
07:24 Anti-spoofing / P(Y) code
08:00 Direct acquisition of P code
08:27 M code
08:55 L1C (Link 1, Civilian)
09:32 L2C (Link 2, Civilian)
10:37 L5
11:18 L1, L2 … L5?  What about L3 and L4?
11:47 Review of GPS links and codes
12:37 Summary