Because different application(Wi-Fi, GSM/GPRS, 3G/4G, Bluetooth) are integrated into navigation system, the harmonic of RF signal will influence the GPS reception. The multi-tone active interference canceller(abbr:MTAIC) can reject external RFinterference which come from other active components on the main board, to improve the capacity of GPS reception without any need HW change in the design.

．Jamming function test:
．MT3329 GPS Module and MT3339 GPS Module
．Jamming Bandwidth from 1560MHz to 1590MHz
．C/N value initial setting to 40dB
．Increase Jamming Signal level to reduce C/N=37dB