Comment by IndySun
12 hours ago
Called M-Code.
Has a fascinating history.
https://odimpact.org/case-united-states-opening-gps-data-for...
12 hours ago
Called M-Code.
Has a fascinating history.
https://odimpact.org/case-united-states-opening-gps-data-for...
M-Code is a new encrypted signal that is not fully operational yet. OCX was supposed to enable it.
GPS has always had the P(Y) code, which is an encrypted signal, at a higher chip rate than the C/A code that has been broadcast on L1 forever. The P(Y) code has its own interesting history of (semi-)codeless processing. If the US military is lucky, the history books will close on that by 2030: https://www.gps.gov/codelesssemi-codeless-gps-access-commitm... . (Currently, 21 GPS satellites broadcast L5.)