Switchable Beam Steering/Null Steering Algorithm for CW Interference Mitigation in GPS C/A Code Receivers

Improvement of Pattern Null Depth and Width Using a Curved Array With Two Subarrays for CRPA Systems

“…The array consists of a single reference element at the top of a sphere with a radius of rs and eight auxiliary elements that are arranged in two circular subarrays. The radii of the two subarrays are denoted as r1 and r2 and are defined in (1). The heights of the subarrays are expressed as h1 and h2, and their definitions are shown in (2).…”

“…However, the planar arrangement of the UCA results in a low signal-to-interferenceplus-noise ratio (SINR) at low elevations because of its poor null steering performance. For this reason, many adaptive algorithms have been developed to improve the SINR by determining the optimum array weights from a signal processing perspective, as in [1]− [4]. Much effort has also been made by applying various design approaches for individual array elements to improve their radiation characteristics from an electromagnetic (EM) perspective [5]- [8].…”

“…An accurate and efficient integration of a 1/R 2 near-singular kernel on curved surface is the prerequisite for the higher order moment method [1], [2] solution to the magnetic-field integral equation (MFIE). A number of schemes have been developed to handle the near singularity on flat triangle elements [3]- [12], whereas the literature about the near singularity on curved triangles or curved quadrilaterals is scarce [13], [14].…”

Reconfigurable adaptive linear array signal processing in GNSS applications

“…Most of the prior work either focused on developing adaptive beamforming and filtering technique [4,5,6] to suppress the interference under the predetermined array configuration or does not utilise adaptive array algorithm [13,14,15] to suppress interference adaptively. Therefore the distinguishing aspect of this proposal is in adopting a strategy of adaptively reconfiguring both the antenna array configuration as well as setting the weights of the adaptive filter in order to maximize the interference suppression.…”

“…As the array configuration plays a fundamental role in the array signal processing performance, it is an important design problem [1,2,3]. However, most of the work in the literature focuses on adaptive beamforming and filtering techniques with the array configuration taken to be fixed [4,5,6]. Under certain scenarios, the number of available Degree of Freedom (DOF) may be substantially reduced and the performance of adaptive array severely degraded by the fixed array architecture.…”