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DIGISONDE-4D
SYSTEM MANUAL
VERSION 1.2.11
5-10 SECTION 5 - SYSTEM SOFTWARE
CHAPTER 2
SYSTEM SOFTWARE OF CONTROL COMPUTER
INTRODUCTION
5:6. The Control Platform of Digisonde-4D sounder is responsible for:
• Measurement progression control in accordance with the program specification
• Hardware control
• Setting up transmission and reception in all measurement modes
• Initiation of hardware tasks
• Data Acquisition
• Collection of raw data during the measurements
• Collection of housekeeping data during BIT
• Packaging and delivery of the sample data to the Data Platform,
• Scheduling Digisonde
®
measurements
• Schedule progression control in accordance with the schedule specification
• Switching schedules at given times
• Synchronization to the GPS time reference
• Accepting configuration changes:
• Program and schedule definitions,
• Schedule start times,
• Restricted Frequency Interval Lists (RFIL),
• Digital receiver configuration,
• Tracking filter configurations.
• Switching operational states in response to commands
5:7. The Control Platform operating software, Digisonde
®
Embedded System Control (DESC), runs under
the management of a Real-Time Operating System (RTOS) “RTEMS” that ensures time-deterministic execution
of the software tasks.
DESC BLOCK DIAGRAM
5:8. Block diagram of DESC is shown in Figure 5-2. Red lines in the DESC diagram denote “hard” real-
time events driven by the 1 PPS heartbeat signal from the GPS receiver, 5 ms interrupts produced by the Tim-
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