Radar and ARPA Manual

TARGET DETECTION

143

This coverage results from the

effect of

the

metal base plate

This coverage results from the

metal circumference band

Figure 3.22 Theoretical vertical polar diagram

of

the

Lunenburg lens.

The

horizontal polar diagram

is

virtually

a

circle,

i.e.

there

are no

'preferential' directions.

3.4.4 Buoy patterns

Although

the

addition

of a

radar reflector array

improves

the

overall radar response

of a

target,

it

does

not assist

in

the identification of the target. Some experi-

ments were carried

out

where targets (such

as

spar

bouys) were fitted with arrays

and

placed

in

patterns.

Although these patterns were readily recognisable