立体基线算法的测向误差研究

The Research on Direction-finding Error of Direction Finding with Spatial Baseline

立体基线法测向是相位干涉仪测向的一种,可以应用于复合制导的被动雷达导引头(passive radarseeker,PRS)中。如果测向误差过大,将直接影响反辐射导弹(anti-radar missile,ARM)命中精度。文中对立体基线法的测向误差进行了详细的推导,得到了在天线围成正三角形时,方位角和仰角联合测向误差达到最小;定性的得到天线围成周长和测向误差成反比关系;半径波长比增大,测向误差减小等结论。并通过仿真验证了结论的正确性。

Direction finding with spatial baseline is a way of direction finding with interferometers, which can be applied to passive radar multi-mode seeker. If the direction finding error is too large, it could affect ARM shooting accuracy directly. For direction finding with spa- tial baseline, direction finding error was studied in detail. It shows that equilateral surrounded by the antenna, the azimuth and elevation combined error is minimum; It is quantitatively analyzed that the perimeter surrounded by antenna is inversely proportional to direction finding error; With radius-wavelength ratio increases, the direction finding error is reduced etc. The simulation result confirms the correct- ness of the conclusions.