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Antenna array with adaptive beam forming technique is an effect way for GPS receiver to suppress the ambient interference, which, however, would be malfunctioning due to the saturation problem in radio frequency (RF) front or intermediate frequency (IF) front caused by the strong interference. To tackle it, this paper demonstrates a scenario consisting of two stages processing, i.e. two anti-saturation modules in RF-front and one anti-jamming module in IF front. The anti-saturation module based on two antennas, is realized with the RF phase shifter and amplifier and capable of forming a deep null in the direction of the strong interference, while the anti-jamming module employs the blind space time adaptive processing (STAP) algorithm to improve the anti-jamming capability. Compared to the RF-front beam former or the IF-front anti-jamming algorithm, not only can the proposed system achieve the anti-saturation and anti-jamming performance but also has more degrees of freedom to suppress interferences. The feasibility is proved by the experiment, exhibiting at least 21 dB anti-saturation improvement and nearly 60 dB interference mitigation. Introduction From the google maps and the popular game ‘pokemon go’ (based on the position of the player), the GPS service is widely used in our daily life. However, the weak power of GPS signal in the receiver varying from -130 to -110 dBm, make it vulnerable to the environmental interference [1]. The adaptive beam forming technique based on antenna array was the dominated method to mitigate the interference, which attracted a lot of researchers’ attention in the past decades [2,3,4]. For continuous wave interferences (CWIs), [5] reported an anti-jamming system comprising cascaded CWI-detectable adaptive notch filter (ANF) modules, with each module able to mitigate one CWI. Several windows were employed to increase time–frequency plane resolution in an enhanced short-time Fourier transform (STFT)-based jamming mitigation system [6]. Wavelet packet transform(WPT)-based mitigation blocks were introduced and investigated for anti-jamming in [7]. A two-stage blind adaptive anti-jamming algorithm can cancel interferences by projecting the array received signals on the orthogonal complement space of interferences, which utilized the CLEAN method to estimate direction of arrivals of GPS signals [8]. To improve the anti-jamming capability, a vector delay lock loop (VDLL) is proposed in [9]. The aforementioned approaches are capable of suppressing the ambient interference on the condition of the RF or IF front end is not in saturation. For significantly strong interference, the LNA in the RF front or the amplifier in the IF front would be saturated, 270 Advances in Computer Science Research (ACRS), volume 54 International Conference on Computer Networks and Communication Technology (CNCT2016)

Design and Experiment of Adaptive Anti-saturation and Anti-jamming Modules for GPS Receiver Based on 4-antenna Array