Maintenance Manual

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3.1.3 Doppler Operating Mode Considerations
The R3D and R5D offer the following advantages:
 In high-clutter environments, it can operate in either FastScan mode or in Doppler Mode.
 It can be switched to Doppler Mode if, in FastScan mode, it cannot reliably detect small targets in
rough vegetation, uphill terrain, or any other high-clutter environment.
 In Doppler Mode, the scan rate is reduced to increase time-on-target, allowing for separation of
moving targets from clutter.
Generally, the FastScan mode is recommended for low clutter environments. If high clutter levels prevent
proper detection of targets, it is recommended to switch to a Doppler mode.
The three following conditions dictate switching from FastScan to Doppler mode:
- Detection range of line-of-sight targets is below expected or required values.
- Radar is mounted high and/or environment contains tall vegetation and/or uphill terrain.
- Detection of targets past the FastScan detection range is required.
Three Doppler modes are available: Short, Medium and Long time-on-target. When switching to Doppler mode,
it is recommended to first use the short time-on-target, and verify radar operation and detection in the
environment considered. If target detection still doesn’t meet expectations, then the radar should be switched
to medium or long time-on-target. It is important to note that each time the time-on-target is increased, the
track reporting delay increases.
For each Doppler mode, two selected ranges can be configured (R3D: 3400m or 6500m, R5D: 5500m or
10500m). The short range provides the best resolution, but the maximum detected range is restricted to
approximately 3 km for the R3D and 5 km for the R5D. Beyond these ranges it is recommended to use the long-
range setting. For the short time-on-target, it is not recommended to use the long-range setting, as the
effective detection performance does not fully take advantage of the available range. For the long time-on-
target, the short - range setting is not recommended because the long time-on-target is not used to its full
potential and at this range, medium and short time-on-target provide faster update rates.
Figure
23 – R3D and R5D Mode Selection Table