Scanning the Issue/Technology -- GPS
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Figure 3

Fig. 3. Each GPS satellite transmits at two frequencies in the L band. The signal carrying C/A-code at L1 has been available for civil use in a degraded mode. Access to the P(Y)-code is limited to the DoD-authorized users via encryption. Civil users may use the P(Y)-code signals, but without the benefit of knowing these secure codes.

Proceedings of the IEEE    January, 1999    Volume 87    Number 1    

(c) Copyright 1999, The Institute of Electrical and Electronics Engineers, Inc.