Abstract
The anti-jamming antenna is one of the most efficient ways to resist the adversary effect of the interference signal in GNSS positioning. Most anti-jamming antennas can adaptively adjust the radiation figure of the antenna to minimize the interference impact. A side effect of changing the radiation figure is that the antenna phase center (APC) is also changed accordingly. Meanwhile, a stable phase center is a prerequisite for high precision GNSS positioning, thus the anti-jamming and high-precision becomes a dilemma for the GNSS antenna design. This study proposed an efficient antenna phase center variation (PCV) compensation algorithm for the anti-jamming antennas which enables real-time high-precision applications with the anti-jamming antennas. The performance of the algorithm is evaluated with the short baseline tests, and the results indicate that the proposed algorithm can reduce the carrier phase residuals by compensation of the anti-jamming antenna PCV and consequently, the 3D root mean squares (RMS) of real-time kinematic (RTK) positioning in two experiments is improved by 42.3% and 9.7% respectively. After PCV correction, the RTK positioning with the anti-jamming antennas achieves better than 4 cm accuracy.
Highlights
The vulnerability of the navigation signal is one of the major challenges of the global navigation satellite system (GNSS) [1]
After the instantaneous phase center (IPC) is estimated, the phase center variation (PCV) caused by the power inversion (PI) beamforming algorithm can be compensated in realtime
The performance of the PCV compensation algorithm is tested with two groups of short baseline real-time kinematic (RTK) experiments with different element weights
Summary
The vulnerability of the navigation signal is one of the major challenges of the global navigation satellite system (GNSS) [1]. Konovaltsev et al pointed out that millimeter level phase center stability is achievable with precisely modeling the radiation field of each array element and the transmission characteristics of the RF front-end [5]. K. Cao et al.: Real-Time PCV Compensation Algorithm for the Anti-Jamming GNSS Antennas variation characteristic using a two-element antenna array [7]. For the anti-jamming antennas, the receiver antenna involves multiple individual antenna elements and the radiation figures are adjustable according to the interference signal direction, its PCV changed with the radiation figure. The purpose of the algorithm is to enable the anti-jamming and high-precision simultaneously, so the first two steps are implementing the antijamming function and the last two steps are designed for antenna PCV compensation. In the PI algorithm, the direction of the jamming signals can be automatically determined, so no extra action is required to calculate the interference signal direction
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