Ublox LEA-6, Руководство по интеграции

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LEA-6 / NEO-6 / MAX-6 - Hardware Integration Manual
UBX-14054794 Production Information Product handling
Page 62 of 85
Measures against in-band jamming include:

Maintaining a good grounding concept in the design

Shielding

Layout optimization

Filtering

Placement of the GPS antenna

Adding a CDMA, GSM, WCDMA bandpass filter before handset antenna
3.3.8.4 Out-band jamming
Out-band jamming is caused by signal f
requencies that are different from the GPS carrier (see
Figure 61
). The main
sources are wireless communication systems such as GSM, CDMA, WCDMA, WiFi, BT, etc.
Figure 61: Out-band jamming signals
Measures against out-band jamming include maintaining a good grounding concept in the design and adding a
SAW or bandpass ceramic filter (as recommend in
Section 3.3.6 ) into the antenna input line to the GPS receiver
(see Figure 62).
Figure 62: Measures against in-band jamming
3.3.8.5 GPS and GSM solution with integrated SMT antennas and chip SIM
An example is available on our C16 telematics reference design [12], that combines LEON-G200 GSM/GPRS
modem module with NEO-6Q GPS receiver module.