Which GPS type can only pick up L1 signals?

The choice of single frequency is correct because a single frequency GPS receiver is designed to only receive signals transmitted at one frequency, specifically the L1 frequency in the case of the Global Positioning System (GPS). The L1 band is used for civilian GPS signals and operates at a frequency of 1575.42 MHz. This means that such receivers cannot utilize additional frequencies that other GPS types can receive, such as L2 or L5, which are utilized in dual-frequency and multi-frequency systems for improved accuracy and resistance to signal interference.

In contrast, dual frequency receivers can pick up signals from both the L1 and L2 frequencies, providing benefits like better positioning accuracy and the ability to correct for atmospheric conditions. Multi-frequency receivers extend this even further, often capable of picking up two or more different signals across multiple frequency bands. Broadband frequency, while it may imply the capability of handling various signals across a wide spectrum, is not a standard term in GPS discussions and lacks the specific context necessary for this question.

Thus, it is the single frequency GPS receiver that solely processes L1 signals, confirming its classification correctly.