NEO-8Q / NEO-M8 - Hardware integration manual
UBX-15029985 - Production information
Product handling
Page 26 of 27
C1-Public
Measures against in-band interference include:
•
Maintaining a good grounding concept in the design
•
Shielding
•
Layout optimization
•
Filtering
•
Placement of the GNSS antenna
•
Adding a CDMA, cellular, WCDMA band pass filter before handset antenna
Out-band interference
Out-band interference is caused by signal frequencies that are different from the GNSS carrier (see
Figure 16). The main sources are wireless communication systems such as cellular, CDMA, WCDMA,
Wi-Fi, BT, etc.
Figure 16: 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 4) into the antenna input line
to the GNSS receiver (see Figure 17).
Figure 17: Measures against out-band interference
☞
For design-in recommendations in combination to cellular operation see the Appendix.
☞
See the GPS Implementation and Aiding Features in u-blox wireless modules [8].
