Joint calibration algorithm for gain-phase and mutual coupling errors in uniform linear array
| Autor: | Zengping Chen, Yue Zhang, Weixing Li, Jianzhi Lin |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Aerospace Engineering
02 engineering and technology Least squares Reduction (complexity) Matrix (mathematics) 0203 mechanical engineering Robustness (computer science) Distortion 0202 electrical engineering electronic engineering information engineering Calibration Electronic engineering Uniform linear array Calibration accuracy Mathematics Least-squares Motor vehicles. Aeronautics. Astronautics Coupling 020301 aerospace & aeronautics Digital array Mechanical Engineering 020206 networking & telecommunications TL1-4050 Gain and phase errors Mutual coupling Rotation (mathematics) Algorithm |
| Zdroj: | Chinese Journal of Aeronautics, Vol 29, Iss 4, Pp 1065-1073 (2016) |
| ISSN: | 1000-9361 |
| Popis: | The effect of gain-phase perturbations and mutual coupling significantly degrades the performance of digital array radar (DAR). This paper investigates array calibration problems in the scenario where the true locations of auxiliary sources deviate from nominal values but the angle intervals are known. A practical algorithm is proposed to jointly calibrate gain-phase errors and mutual coupling errors. Firstly, a simplified model of the distortion matrix is developed based on its special structure in uniform linear array (ULA). Then the model is employed to derive the precise locations of the auxiliary sources by one-dimension search. Finally, the least-squares estimation of the distortion matrix is obtained. The algorithm has the potential of achieving considerable improvement in calibration accuracy due to the reduction of unknown parameters. In addition, the algorithm is feasible for practical applications, since it requires only one auxiliary source with the help of rotation platforms. Simulation results demonstrate the validity, robustness and high performance of the proposed algorithm. Experiments were carried out using an S-band DAR test-bed. The results of measured data show that the proposed algorithm is practical and effective in application. |
| Databáze: | OpenAIRE |
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