Radio Ray (Radar) Range-Height-Angle Charts

Machine Plotting of Radio/Radar Vertical-Plane Coverage Diagrams.

“…The basic method of computing this chart has been described (6). For the lobe plota, the chart-plotting program has been made a subroutine, called RHACHT, such that any maximum range ar-d height can be specified.…”

A Guide to Basic Pulse-Radar Maximum-Range Calculation. Part 1. Equations, Definitions, and Aids to Calculation

“…(This definition is actually for Ft but applies to Fr as well through the principle of reciprocity.) Symbolically, (42) where R, (, and o are the range, azimuth, and elevation coordinates of the point in space. Thus F has the dimensions of a voltage ratio, and so in the range equation where power ratios (such as Gt and Gr) occur to the first power, the pattern-propagation factors occur as Ft 2 and F,2.…”

“…If absorption is ignored and the target is in the antenna pattern maximum, the direct-path-wave field strength Ed can be used for E 0 in Eq. (42). If the target is not in the pattern maximum, this field strength must be multiplied by the antenna pattern factor f(o), which describes the antenna vertical-plane The three following classes of reflection-interference problems require successively more elaborate procedures for their solution:…”

“…Unfortunately, this model does not result in simple formulas for the range-height-angle relationship; a numerical integration is required to trace a ray path (41,42). However, machine-computed results can be used to plot a range-height-angle chart for this model, on which the raypath lines are straight; this result is accomplished by suitably distorting the contours of constant height (42).…”

“…Sun noise, 48 radar equation, 6 Swerling cases, 28 range, extent of, 13 System-degradation loss, 84 repetition frequency, 7,11,42 System loss factor, 70 noise factor, …”