1.Beijing Institute of Satellite Information Engineering， Beijing 100086,， China,； 2.School of Microelectronics and Communication Engineering， Chongqing University,， Chongqing 400044,， China
Abstract： In the angle tracking of radar, communication, TT&C and other fields, sum-difference amplitude-comparison monopulse angle measurement technology that based on phased array antenna is the main methodology. However, the following angle measurement errors exist. One is the estimation error of signal amplitude caused by low SNR. The other is the pattern distortion error caused by changing the beam pointing. In order to reduce these errors, the cyclic-shifted autocorrelation is proposed to estimate the signal amplitude, so that the in-band noise could be mitigated. In addition, the concentric ring arrays with structural symmetry is utilized to reduce the distortion of the pattern furtherly. The implementation steps and computational complexity analysis of the new algorithm is present. Simulation illustrates that new methodology can effectively improve the precision of angle estimation.
Key words : angle tracking；cyclic-shifted autocorrelation,；concentric ring arrays,；amplitude estimation
