Our collection of RT Logic whitepapers discusses our product architecture in much greater detail than
the corresponding data sheets. For access to these white papers please email us by simply clicking on
the titles of interest below.
T400CS Channel Simulator
The RT Logic T400CS Channel Simulator is a sophisticated, yet easy-to-use economical communications link simulator. The T400CS emulates key RF channel propagation path characteristics including range delay, Doppler, range attenuation, and fading. All characteristics are implemented in a smooth and phase-continuous manner. The T400CS is equipped with Intermediate Frequency (IF) or Radio Frequency (RF) inputs/outputs for the standard SATCOM frequency bands (C, L, S, X, and Ku). Use of the Channel Simulator requires no knowledge of the signal waveform(s).

The T400CS emulates channel effects for test and training applications, without using expensive satellite transponder bandwidth. The T400CS enables accurate and repeatable testing of modern communications equipment and algorithms that rely on particular terminal-to-satellite and/or satellite-to-terminal propagation characteristics for correct operation. A problematic propagation path can be constructed, for example, then used repetitively for system-level and component-level analysis and test. Furthermore, expected link condition extremes are easily emulated in a repeatable and consistent manner to enable performance verification and worst-case evaluation of modems and communication equipment.
Pragmatic General Multicast
As telemetry systems migrate toward network-centric distribution architectures, more efficient mechanisms are needed to distribute the telemetry data from the source to various users of the data. The most widely used network protocol for reliable delivery of telemetry data over IP networks is TCP/IP. With TCP/IP, the bandwidth required to distribute telemetry data increases linearly according to the number of point-to-point connections. An alternate approach to reliably deliver telemetry data to multiple end users in a network efficient manner is the Pragmatic General Multicast (PGM) protocol.
Leveraging Internet Protocol Networks To Transport Multi-Rate Serial Data Streams
As the rates and numbers of serial telemetry data streams increase, the cost of timely, efficient and robust distribution of those streams increases faster. Without alternatives to traditional pointto- point serial distribution, the complexity of the infrastructure will soon overwhelm potential benefits of the increased stream counts and rates. Utilization of multiplexing algorithms in Field- Programmable Gate Arrays (FPGA), coupled with universally available Internet Protocol (IP) switching technology, provides a low-latency, time-data correlated multi-stream distribution solution. This implementation has yielded zero error IP transport and regeneration of multiple serial streams, maintaining stream to stream skew of less than 10 nsec, with end-to-end latency contribution of less than 15 msec. Adoption of this technique as a drop-in solution can greatly reduce the costs and complexities of maintaining pace with the changing serial telemetry community.
Portable Universal Ground Processing Unit
The RT Logic PUGPU system supports the full set of Telemetry, Tracking, and Commanding (TT&C) ground processing functions, providing a Universal Processor and supporting the optimal Radio Frequency (RF), Intermediate Frequency (IF) interface, and remote software interface functions for effective ground operations.

The PUGPU supports frequency conversion through its Frequency Conversion Subsystem (FCS), a digital-based TT&C baseband processing system (DBP) using a commercially available RT Logic Telemetrix XL, spectrum monitoring with a Digital Spectral Analysis (DSA) subsystem, and an option for an integrated beacon tracking receiver providing AM and receive signal strength outputs used by antenna control units. An implementation of the Consultative Committee of Space Data Systems (CCSDS) protocols is also implemented, including the Space Link Extensions (SLE) utilized for interfacing to the ground networks via Internet Protocol.

NASA-specific protocols for ranging data Universal Tracking Data Format (UTDF) and Leo-T for commands and telemetry are also supported.
Automatic Range Equipment Setup and Control
Today Ranges are faced with the typical dilemma of doing more with less money, less time, and less experienced range personnel. Meanwhile, Ranges are being forced to make their operations more efficient in use of time, money, and functionality. As a result, Ranges are looking for automated ways to remotely configure and operate their tracking stations and to provide interoperability between ranges, sites, and equipment.

RT Logic worked with numerous range operators and equipment vendors to create an open software architecture that provides rapid device configuration, equipment status at a glance, and automatic fault detection and isolation. RT Logics architecture utilizes the CORBA specification to achieve extensibility and scalability for future range requirements. Adoption of this architecture and approach will reduce costs, time, and mistakes.