Vehicle-mounted wireless communication GNSS and cellular coexistence interference suppression circuit structure
A technology for suppressing circuit and coexistence interference, applied in vehicle wireless communication services, vehicle communication, radio wave measurement systems, etc. The effect of high precision, good suppression consistency and low cost
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[0030] In order to make the object, technical solution and beneficial effect of the present invention clearer, the following two preferred embodiments of the present invention and the accompanying drawings will be described in detail.
[0031] like figure 1 As shown, the cellular radio frequency link transmits to the cellular antenna through the duplexer, LPF, and ASM devices through the PA output. Due to the active devices on the radio frequency circuits such as PA and ASM, nonlinear effects will occur, resulting in some harmonic noise. Scattered interference signals, and these harmonic spurious interference signals such as figure 2 As shown, the cellular low-frequency band such as B13 / B14 has a frequency of 788M, and the second harmonic just falls near 1575.42M of GNSS, and the cellular antenna is coupled to the GNSS antenna through antenna coupling, thus entering the GNSS In the radio frequency link, the GNSS link enters the GNSS receiver through NOTCH2, Pre SAW, Elna, an...
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