The carriers L1 and L2 are modulated by two PRN codes. What are the names given to these codes?

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Multiple Choice

The carriers L1 and L2 are modulated by two PRN codes. What are the names given to these codes?

Explanation:
Two PRN codes are used to modulate the GPS carriers: the P code and the C/A code. The C/A code (Coarse Acquisition) is the civilian signal on the L1 carrier, designed for easy acquisition and basic positioning. The P code (Precise) provides higher-precision ranging and is transmitted on both L1 and L2; on L1 it is often referred to as P(Y) when encrypted for security. This pairing—P code and C/A code—is why the correct choice is the P code and the C/A code.

Two PRN codes are used to modulate the GPS carriers: the P code and the C/A code. The C/A code (Coarse Acquisition) is the civilian signal on the L1 carrier, designed for easy acquisition and basic positioning. The P code (Precise) provides higher-precision ranging and is transmitted on both L1 and L2; on L1 it is often referred to as P(Y) when encrypted for security. This pairing—P code and C/A code—is why the correct choice is the P code and the C/A code.

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