CALIBRATION OF PHASED ARRAY ANTENNA BY USING EMITTERS WITH KNOWN POSITIONS

Date

2023-12-06

Author

Elibol, Hande

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In active phased array radars, the beam is shaped and steered by adjusting the complex excitation coefficients of the individual array elements. However, one needs to be careful while determining the excitation coefficients of array elements, since there are different phenomena that cause the realized array manifold to differ from the ideal one. When array manifold deviates from the ideal one, using the coefficients obtained for the ideal array will result in a pattern with shallow nulls and/or higher sidelobes. Also, direction finding performance is degraded due to the fact that they use the array manifold. In the literature, three error sources that affect the array manifold are discussed. First one is the channel errors. The signals from antenna elements follow different physical channels which may exhibit different gains and phases changing the array manifold. Secondly, there may be positioning errors in array elements due to manufacturing tolerances. Lastly, there will be mutual coupling between antenna elements especially when the array elements are located close to each other. In this thesis, we consider these three types of errors and try to develop a method that estimates the errors from measurements and use them for calibration. Effects of these errors in sidelobe levels, null depths, and direction finding performance will be discussed by using simulations. We propose a method to calibrate the array by using sources at known locations and investigate its performance under different scenarios.

Subject Keywords

Phased Array Antenna Calibration, Scan Dependent Phased Array Antenna Calibration, Deterministic Maximum Likelihood, Direction of Arrival Estimation, Direction Finding

URI

https://hdl.handle.net/11511/107762

Collections

Graduate School of Natural and Applied Sciences, Thesis