고정밀 측위를 위한 고해상도 각도 추정 기능을 갖는ESPRIT processor 설계에 관한 연구
A Study on a Design of ESPRIT processor with High-Resolution Angle Estimation Capabilities for High Precision Positioning
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초록
본 논문에서는 고정밀 측위를 위한 고해상도 각도 추정 기능을 갖는 ESPRIT(Estimation of Signal Parameters via RotationalInvariance Techniques) processor의 구조를 제안한다. 제안하는 고정밀 ESPRIT processor는 각도추정 정밀도를 높이기 위한16개의 snapshot수와 32비트의 internal precision을 적용하여, 정밀도를 높이면서 낮은 복잡도를 갖는 구조를 제안하였다. 특히ESPRIT 알고리즘의 공분산 행렬과 고윳값 분해와 같은 높은 복잡도를 가지는 연산을 병렬구조와 파이프라인구조를 적용하여, 실시간 도래각 추정이 가능한 하드웨어 구조를 적용하였으며, 요구되는 성능에 따라 2 ~ 8개에 가변 안테나 개수를 지원하는 ESPRIT프로세서를 제안하였다. 제안된 ESPRIT 프로세서는 MI-ESPRIT 알고리즘 기반을 활용하였으며, 이를 통하여, 1km 반경 내의100km/h로 이동 중인 1,000대의 차량에 대한 1.5m 반경의 실시간 측위 정확도를 얻을 수 있는 구조를 제안하였다.
Abstract
This paper proposes the architecture of an ESPRIT (Estimation of Signal Parameters via Rotational InvarianceTechniques) processor with high-resolution angle estimation capabilities for precise positioning. The proposedhigh-precision ESPRIT processor enhances angle estimation accuracy by applying 16 snapshots and 32-bit internalprecision, achieving high precision while maintaining a low-complexity structure. n particular, by applying parallelstructures and pipeline structures to calculations with high complexity, such as covariance matrix and eigenvaluedecomposition of ESPRIT algorithms, a hardware structure capable of estimating the arrival angle in real time wasapplied, and an ESPRIT processor was proposed to support the number of variable antennas between 2 and 8depending on the application field.proposed ESPRIT processor improved the performance by utilizing multipleinvariants of array antennas. This allows for real-time positioning accuracy within a 1.5-meter radius for 1,000vehicles moving at 100 km/h within a 1 km radius.
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