NEO-8Q / NEO-M8 - Hardware Integration Manual
UBX-15029985 - R04 Production Information Product handling
Page 27 of 31
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]
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