Abstract:

Under the effect of earth curvature on geometry of ultralong baseline bistatic airborne radar, the space-time clutter distribution severely depends on bistatic geometry and area of beam coverage. To solve this problem, analytical expression of the iso-range ring is derived in geocentric coordinates and it turns out that the projection of the iso-range ring on plumb surface in which the baseline lies is parabolic. On analysis of several typical bistatic geometries and area of beam coverage, the stripped truncation characteristics of space-time distribution of clutter for ultralong baseline bistatic airborne radar and range-dependence of clutter are researched. Simulation results verify the validity and effectiveness of the conclusion.