nRF9160 DK v0.8.5

GPS

The nRF9160 has a dedicated Global Positioning System (GPS) port to support global navigation.

The GPS signal is received either from the onboard or an external GPS antenna. The onboard antenna (A2) is connected to the combined Low-Noise Amplifier (LNA) and Band-Pass Filter (BPF) U3 through switches U33 and U34.

Figure 1. Onboard GPS antenna (A2), LNA/BPF (U3), connector P29, and switch SW12
Onboard GPS antenna (A2), LNA/BPF (U3), connector P29, and switch SW12

The onboard antenna can be disconnected and an external GPS antenna enabled by attaching the external GPS antenna to connector P29 and sliding switch SW12 to CON position. 3.3 V DC is fed through P29 to supply an external LNA, if desired. The external GPS antenna can be connected to connector P29 (Hirose part no. U.FL-R-SMT-1). A compatible adapter cable is required to connect a GPS antenna to the DK.

Switch U34 and the combined LNA and BPF are enabled by the GPS-enable signal from the nRF9160.

The signal is next amplified and filtered in the LNA and BPF U3 before it is fed to the nRF9160. This makes the GPS receiver more sensitive to GPS signals and less sensitive to interference from other sources on the DK or nearby.

Note:
Figure 2. GPS connected to the nRF9160
GPS connected to the nRF9160