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Unfortunately there exist often some practical limitations
as
- not all of the influencing parameters will be found out
or can be measured (a),
- only one radiometer is available so that synchronous
measurements will not be possible (b),
- the measuring distance is rather low if a cherry picker
or similar devices are used as instrument platform (c),
- the instrument requires a large aperture to collect
enough radiation energy (d),
- the fields are sometimes not easily accessible and the
preparation time for the installation of the equipment
at the test site is long in the case of mobile stations
(e, f),
- the meteorological conditions don't often allow field
measurements (e, f).
Ins tramentati oÓun
The mobile station we are using for the field measurements
is shown in Figure 2.