Adjustment option is available in the advanced menu. See
Second trace echo
A second trace echo is an echo received from a distant target,
received after the following pulse has been transmitted.
Second trace echoes are present only under abnormal atmospheric
conditions, or in condition of super-refraction.
These echoes will be displayed at their correct bearing, but at a
wrong range.
Second trace echoes can be recognized by their irregular shape.
Since the period between two subsequent transmitted pulses is
subject to small variations, the second trace echo appears
undefined and hazy.
Second trace echoes are automatically suppressed by the radar
when the interference rejection is turned on. Refer
Sidelobe echoes
Radar antennas have a radiation pattern consisting of a main lobe
and several very small sidelobes. Most of the energy transmitted by
the radar is radiated and received back on the main lobe, and a very
small part on the sidelobes. This has no effect in case of distant or
small targets, but the returns from a large target at short range (less
than 3 NM) can generate, on both sides of the main echo and at the
same range, arcs or series of small echoes. These effects, when they
are an extension of the main echo, can cause momentary errors for
the tracking, and course and speed values given by the tracking can
become unstable.
The problem can usually be eliminated or strongly reduced by an
accurate adjustment of the Sea clutter control. Refer to
Blind sectors
Funnels, masts or other obstructions (when located near the radar
antenna) may cause blind or shadow sectors, where the target
visibility may be completely lost or strongly reduced. Targets
remaining in these sectors for a long time (more than 10 antenna
revolutions) will be considered lost, and the lost target alert will be
triggered.
122
Radar
| GO XSE/XSR Operator Manual
Summary of Contents for GO XSE Series
Page 1: ...GO XSE XSR Series OPERATOR MANUAL ENGLISH www simrad yachting com ...
Page 2: ......
Page 16: ...16 Contents GO XSE XSR Operator Manual ...
Page 62: ...62 Waypoints routes and tracks GO XSE XSR Operator Manual ...
Page 97: ...Trolling motor autopilot GO XSE XSR Operator Manual 97 ...
Page 240: ......
Page 241: ......