GPS Signal Bands – Which of the following is a correct GPS L1 frequency? Select the option that correctly states the L1 carrier frequency used by GPS.

Introduction / Context:
GPS transmits on multiple carrier frequencies, historically L1 and L2, with L5 added for safety-of-life and advanced civil use. Knowing the correct frequencies is essential for receiver design, interference analysis, and multi-frequency positioning techniques.

Given Data / Assumptions:

• Legacy GPS civil signal on L1 (C/A code) is widely used.
• L2 and L5 are additional carriers for dual/triple-frequency solutions.
• We seek the exact L1 frequency value.

Concept / Approach:

GPS L1 carrier is defined as 1575.42 MHz (which equals 154 * 10.23 MHz). L2 is 1227.60 MHz (120 * 10.23 MHz), and L5 is 1176.45 MHz (115 * 10.23 MHz). Any deviation from these precise values indicates a different band or a distractor.

Step-by-Step Solution:

Verification / Alternative check:

GNSS interface specifications list L1 = 1575.42 MHz; this value is standard across receiver documentation.

Why Other Options Are Wrong:

They either correspond to other bands, incorrect numbers, or incorrect units.

Common Pitfalls:

Mixing up L1 and L2, or not noticing frequency units (Hz vs MHz).

Final Answer:

L1 with frequency 1575.42 MHz