The effects of naturallyoccurring propagation disturbances on discrete focused arrays
Abstract
The disruptive effects of ionospheric irregularities on spacebased surveillance radars is considered. Propagation theory is used to first describe the parameters critical to such systems and to incorporate ionospheric parameters into that model. This is done using the equivalent phase screen approach with a statistical model of the in situ irregularity structure. The primary limitation that scintillation places on radar performance is the loss of spatial coherence, i.e., the resolving power of the radar. This, in turn, depends critically upon the turbulence strength, anisotropy, and motion of kilometerscale irregularities. Although a complete spatial and temporal morphology of highlatitude structure is not yet known, data are available for near worst case performance estimates. Spaced receiver scintillation data directly provide all of the parameters critical to the performance analysis. Samples of such data from the auroral zone and central polar cap are presented; they show that radars with moderatesized apertures may suffer degradation at some latitudes and local times.
 Publication:

Southwest Research Inst. Report
 Pub Date:
 March 1983
 Bibcode:
 1983sri..reptR....R
 Keywords:

 Anisotropy;
 Arrays;
 Independent Variables;
 Ionospheric Disturbances;
 Polar Caps;
 Earth Ionosphere;
 Estimates;
 Losses;
 Mathematical Models;
 Military Spacecraft;
 Polar Regions;
 Power;
 Radar Echoes;
 Radar Receivers;
 Scintillation;
 Statistical Analysis;
 Time;
 Communications and Radar