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http://dx.doi.org/10.7840/kics.2012.37C.12.1245

Averaging Methods for Enhancing the Performance of DOA Estimation Under the Rotor Effect  

Yun, Seonhui (충남대학교 전자전파정보통신공학과 이동멀티미디어통신 연구실)
Oh, Jongchan (충남대학교 전자전파정보통신공학과 이동멀티미디어통신 연구실)
Kim, Jun O (국방과학연구소 제3기술연구본부 4부장실)
Choi, Sangwook (국방과학연구소 제3기술연구본부 4부장실)
Ahn, Jae Min (충남대학교 전자전파정보통신공학과 이동멀티미디어통신 연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.37C, no.12, 2012 , pp. 1245-1255 More about this Journal
Abstract
There are various anti-jamming algorithms for the GNSS system which is vulnerable to jamming, and the methods using array antenna show the best performance. Among them, the DOA estimation algorithms to identify the location of the jammer is very important. However, in case of the rotorcraft, the wireless channel which amplitude and phase changes with time is generated by the rotation of the rotor and it affects the performance of existing anti-jamming algorithms. In this paper, we modeled the effect of the rotor in four scenarios according to the correlation of antennas and assured that the performance of DOA estimation algorithms are degraded and saturated regardless of JNR due to the rotor effect. When we use the averaging method to solve this problem, the performance is improved as increasing samples for estimating. And in case of using moving average method with averaging, it shows similar performance. In addition, it reduces the required memory and moderates the variation of DOA estimation.
Keywords
DOA; rotor; MUSIC; ESPRIT; GNSS;
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