Aerospace and Electronic Systems Magazine August 2016 - 13
TC HARDWARE DESCRIPTION
Figure 2.
Mars Orbiter Spacecraft mounted on PSLV C25.
The TC subsystem configuration
is shown in Figure 3. The TC subsystem is interfaced with S-band
receiver. Digital signals from a
Phase Shift Keying demodulator
[10] are fed to the decoders. The
TC subsystem consists of a Consultative Committee for Space
Data Systems standard decoder
[11], [12], a processor glue logic,
a command distribution unit, a
MAR31750 microprocessor [13],
a memory management unit [14],
and a 1553B remote terminal [15].
There is a provision for cross
strapping of receivers with decoders. The main and redundant
MTcPs are interfaced with main and redundant decoders. Due to
cross strapping of receivers with decoders, commands can be sent to
decoder 2 from receiver 1 and also decoder 1 can receive commands
from receiver 2. Apart from that, decoder 1 can send commands to
MTcP 2 and also MTcP 1 can receive commands from decoder 2.
There exists a provision to send commands to both the processors
simultaneously through any one of the decoders. The simultaneous
commanding helps in keeping configuration of both the processors
the same. The simultaneous commanding is mainly used in MOM.
The system has a 1553B bus for command/data transfer to
AOCE and other subsystems. The AOCE package has the bus controller (BC) for the 1553B bus. The TC provides a remote terminal
(RT) interface for AOCE 1553B bus.
The MTcP reads data from the TC decoder and stores, processes, or distributes the command per the pre-defined MTcP modes.
The picture of TC flight core card designed for MOM is shown in
Figure 4.
SOFTWARE HARDWARE INTERFACE
Figure 3.
Telecommand system configuration.
AUGUST 2016
The hardware-software interaction is through memory mapped Input Outputs [16]. The hardware provides timing reference, telemetry information, and system status for software.
IEEE A&E SYSTEMS MAGAZINE
13
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