APC AP9212 User's Guide Page 70

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70
This prototype was used as a basis for preparing the requirements of the Spectrum Scanner
application.
9.3 Requirements
The primary purpose of the software is to interface to the radio receiver and allow recording of
signal strength readings across a given frequency range whilst providing a mechanism for
visualising the data as it is acquired. This broad requirement has been further refined to the
following points:
Spectrum scanning
Users must be able to enter scan parameters such as start frequency, stop frequency,
increment or step size, dwell time, and other conditions, then instruct the receiver to
perform the scan at a specified time. Users must be able to cancel this scan.
Persistent data files
Every scan must be accompanied by a data file storing all the information for archiving
purposes. This data file must store enough information to enable the user to recreate an
identical scan. Circumstantial data, such as date, time, and any other experimental
notes, must also be stored for scientific completeness. These data files must be human
readable and accessible to other software systems for analysis. These data files must also
be able to be loaded back into the Spectrum Scanner application for analysis.
Data visualisation
The majority of scans are expected to run for considerable amounts of time. There needs
to be a mechanism for visualising data as it is acquired to provide the user feedback.
Robust, intuitive user interface
The primary user base for the software are inquisitive high school students. For this reason,
it must be easy to use and provide appropriate dialog messages if an error is
encountered.
Fault Tolerant
The software must continue to run if the receiver is disconnected. For example,
unplugging the serial cable whilst the receiver is scanning should result in an appropriate
warning to be displayed. The software should also automatically resume scanning when
the connection is restored.
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