How to translate the words codeless/semi-codeless in the context of computer security?

Question

Machine translation from one language to another

Apparently, something related to frequencies, detection methods, radio signals, but I just can’t catch the Russian-language analogue.
Examples:
These documents describe US government commitments to support codeless/semi-codeless civilian access to the current P(Y) signals and the transition to the modernized L2C and L5 signals.
The codeless technique can detect attacks using 1.2 sec of correlation, and the semi-codeless technique requires correlation intervals of 0.2 sec or less.