nRF9160 DK v1.0.0

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 active GPS antenna. The onboard antenna (A2) is connected to the Low-Noise Amplifier (LNA) (U2).

Figure 1. Onboard GPS antenna (A2), LNA (U2) and connector J2
Onboard GPS antenna (A2), LNA (U2) and connector J2

The GPS from the onboard antenna is amplified and filtered in the LNA (U2) that has integrated pre-filter and post-filter 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 Development Kit (DK) or nearby. The LNA is enabled by a GPS-enable signal from the nRF9160, using the COEX0 pin.

An external active GPS antenna can be connected to connector J2 (U.FL compatible), and 3.3 V DC is fed through J2 to supply the LNA of the external antenna. When using an external GPS antenna, the onboard GPS LNA (U2) must be disabled to avoid interference. This is done by ensuring that the GPS_EN signal is low and it is set by the AT%XCOEX0 AT command.

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