Search Operations (Cont.)
Search Operations (Cont.)
32
RDR-1600 Pilot’s Guide
TM106101(8/01)
TM106101(8/01)
RDR-1600 Pilot’s Guide
33
7.1.2 Other Aircraft
Tests show that only with extremely careful observation at relatively short
ranges can other aircraft be detected by this type of radar equipment. The
character of this echo is such that this type of radar system cannot be
considered adequate for this purpose.
7.2 SEARCH MODE
An advantage of this radar system is the enhancement of short range
mapping capability. This facilitates locating specific targets on land or sea
and provides a navigational map as a supplement to standard navigation
procedures.
7.1.1 Looking Angle
The incident angle at which the terrain is illuminated has a direct bearing on
the detectable range and the area of illumination. A large incident angle
gives the radar system a smaller detectable range of operation (due to a
minimized reflection of direct radar energy). However, the illuminated area
“A” is larger.
Figure 7.1.1-1. A Smaller Incident Angle
A smaller incident angle gives the radar a larger detectable range of oper-
ation because of an increase of direct radar energy reflected from the
target to the antenna. The area of illumination (“A”) is smaller.
Figure 7.1.1-2. Concentration of the Beam
Concentration of the beam energy on the small area of terrain increases the
magnitude of the echo intercepted by the antenna. The resulting detectable
range is therefore increased for mountainous terrain; the maximum
distance at which this terrain can be monitored is greater because of the
more direct reflection (or radar echo) produced. Illuminating the backslope
of hills stretches the area of coverage beyond the flat terrain coverage.
