Furuno TZT9 User Manual

6. RADAR
6-26
6.29.3 Pulse compression radar principles
The solid state radar is available in several TX-RX methods, and this radar uses the
pulse compression method. This radar transmits and receives using pulse compres-
sion beyond synthesis distance (approx. 0.5 NM to 2 NM (depending on the pulse
length)), and using non-compression within synthesis distance. The radar echoes of
a pulse compression radar are synthesized echoes using these two methods. The
echoes may be displayed differently when compared to the echoes displayed by a
magnetron radar.
Range and signal intensity
When the range is beyond synthesis distance using pulse compression, the signal in-
tensity is equivalent to a magnetron radar, although the transmission power is lower.
When the range is within synthesis distance using non-compression, the signal inten-
sity (including sea clutter and rain clutter) is lower than a magnetron radar because of
the transmission power difference.
When a target comes within the synthesis distance, it is displayed with lower signal
intensity.
Range sidelobe
As a result of pulse compression, range sidelobes may appear to the front and rear of
a strong reflected echo. When the direction of the echo changes, the reflection weak-
ens and the range sidelobes may disappear. Range sidelobes can also be removed
by reducing the gain.
Synthesis
distance*
: Non-compression
: Pulse compression
*: Approx. 0.5 NM to 2 NM
(depending on the pulse length)
Echo
Range sidelobes

Furuno TZT9 Specifications

General

Brand	Furuno
Model	TZT9
Category	Monitor
Language	English