Abstract
Serious mutual coupling effect must be taken into account for the miniaturized adaptive anti-jamming antenna arrays in global navigation satellite system (GNSS) receivers. In this paper, the effect of mutual coupling on the performance of GNSS antenna arrays has been comprehensively discussed. The nulling performance of the GNSS antenna array in presence of mutual coupling is efficiently evaluated by the proposed embedded element pattern method, which is further verified by a simulated miniaturized four-element GNSS antenna array in nonadaptive mode. In the space-time adaptive processing (STAP) array, a generalized wideband signal model based on the dispersion phenomenon is introduced to study the effect of mutual coupling on the optimal STAP array response, signal-to-interference-plus-noise ratio (SINR) loss, and the minimum mean square error (MMSE) of the Wiener filter. Employing the STAP normalized least mean square (NLMS) algorithm, the simulation results show that the mutual coupling leads to a decrease in convergence rate, an increase in misadjustment, and a loss of SINR, whether or not the compensation is considered.
Highlights
On some particular military airborne platforms, limited aperture determines the demand of the miniaturized adaptive anti-jamming antenna arrays in global navigation satellite system (GNSS) receivers [1]–[5]
In order to evaluate the effect of mutual coupling on the nulling performance of GNSS antenna array efficiently, we propose an embedded element pattern method
We evaluate the effect of mutual coupling on the space-time adaptive processing (STAP) GNSS array for wideband interferences cancellation, in which each element consists of a set of time delay lines (TDL) that make up a time window
Summary
On some particular military airborne platforms, limited aperture determines the demand of the miniaturized adaptive anti-jamming antenna arrays in global navigation satellite system (GNSS) receivers [1]–[5]. The simulation results indicate that the mutual coupling leads to the degradation of nulling performance at some known directions Note that this method is not suitable to compensate the adaptive processing because of the practical unknown interferences and the huge memory store of array pattern dataset. The received generalized wideband signal of the array in presence of mutual coupling is disturbed by a banded Toeplitz MCM, which disperses the eigenvalue distribution of the autocorrelation matrix and causes a mismatched steering vector These results indicate that the mutual coupling can disturb the optimal STAP array response and decrease the convergence rate of STAP algorithms, and increase the misadjustment and SINR loss, whether or not the compensation is considered.
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