A Frequency Agile Dual-Band GNSS Receiver Front End with Anti-Jamming Capabilities

This paper presents a dual-band RF front-end for single antenna based GNSS receivers with the capability of detecting and mitigating in-band interference signals. The front-end is composed of a diplexer, a low noise amplifier, RF detectors and switchable filtering banks. A central control unit provides active smart filtering to protect the receiver from interferences by enabling two sub-bands in the lower GNSS band (1165 – 1248 MHz) and one sub-band in the upper GNSS band (1559 – 1610 MHz) as per requirement. The frontend achieves a gain of more than 35dB and out-of-band rejection better than 60 dB and is suitable for GNSS systems including GPS, GLONASS, Galileo and Beidou.