Anti Spoofing (As) - Leica GR10 Operational Manual

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Appendix I: Glossary

Anti spoofing (AS)

The process of encrypting the P-code by modulo-2 addition of the P-code and a secret encryption W-code. The resulting code
is called the Y-code. AS prevents an encryption-keyed GPS receiver from being "spoofed" by a bogus, enemy-generated GPS
P-code signal.
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