ZOE-M8 series - Hardware integration manual
UBX-16030136 - R09
Design-in
Page 24 of 34
Production information
Measures against in-band interference include:
Maintaining a good grounding concept in the design
Shielding
Layout optimization
Filtering, for example, resistors and ferrite beads
Placement of the GNSS antenna
Adding a CDMA, GSM, WCDMA band-pass filter before handset antenna
2.14.6.4
Out-band interference
Out-band interference is caused by signal frequencies that are different from the GNSS carrier (see
Figure 18). The main sources are wireless communication systems such as GSM, CDMA, WCDMA,
Wi-Fi, BT, and so on.
Figure 18: Out-band interference signals
Measures against out-band interference include maintaining a good grounding concept in the design
and adding a SAW or band-pass ceramic filter (as recommend in section 2.14.6) into the antenna
input line to the GNSS receiver (see Figure 19).
Figure 19: Measures against out-band interference
