Frequency-angle selectivity under conditions of 3-D antenna motion

Abstract

Common estimation of frequency-angle signal parameters under conditions of complicated 3-D antenna motions with angle rotations around the space axes is researched. A program package for modeling has been developed. The package calculates Fisher informative matrix and Cramer–Rao estimates of frequency-angle signal parameters. Research showed that (1) frequency-angle selectivity essentially depends on parameters of motion. Common estimates may be essentially better for systems with complicatedly moving antennas than for systems with static antennas or antennas moving with constant velocity; (2) a constant component of velocity makes the common estimates of frequency-angle signal parameters worse and variable components make them better; (3) angle selectivity is mainly determined not by size of array, as for static antenna, but by sizes of area where there is antenna motion (especially periodical motion); (4) in conditions of complicated antenna motion, increasing of angle selectivity takes place even if frequencies of the signal or Doppler’s shift are unknown; (5) by correctly taking into consideration complicated antenna motion, there is often a real possibility to increase common frequency-angle selectivity of the systems.