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Class Simulation Of Real Time, Highly Compressed Video Transmission Through An Interference Limited Environment

CLASS (Communication Link Analysis and Simulation System) has been modified to predict the performance of digital video telemetry systems in remotely controlled spacecraft robotics applications where the communications link may be highly corrupted by RFI (radio frequency interference). Unlike previous functional type simulations which use statistical models to characterize the steady-state channel, this new CLASS tool is an emulation type simulator which is capable of modeling both transient and steady-state conditions in the channel. The system architecture uses sequential tasking to simulate bit-by-bit signal processing through each successive component of the channel. Subsystems are: 1) the digital video data compression and reconstruction subsystem; 2) the Reed-Solomon Codec subsystem; and 3) the TDRSS Link subsystem. Subsystems 2 & 3 form a concatenated coded channel using Reed-Solomon outer code and a convolutional inner code. The novel features of the software package are 1) the modular design offers easy modification of the system configuration; 2) it provides extensive performance characterizations of channel components and subsystems including loss of synchronization and reac-quisitions; 3) through statistical reduction and transformation of emulation type simulation data bases, the simulator may be reconfigured to a speedy, efficient functional type simulation. This paper describes the capabilities, structure and modeling techniques of this new version of the CLASS as it is used in modeling the Orbital Maneuvering Vehicle (OMV) video telemetry return to (VDTLMRTN) channel.