COLORADO SPRINGS, Colo., April 15, 2010 (GLOBE NEWSWIRE) -- Integral Systems, Inc. (Nasdaq:ISYS) announced today at the 2010 National Space Symposium that its wholly-owned subsidiary RT Logic, has successfully delivered its next generation Tracking and Data Relay Satellite System (TDRSS) Cross Link Simulator (TSIM) to multiple civil government and commercial customers over the past year with additional deliveries pending. The new TSIM is based on RT Logic's T400 and T501 product lines. It provides customers with an economical platform to verify operation of space vehicles or transponders designed to access NASA's Space Network (SN) while on orbit.
"We have continued to evolve the TSIM test platform to include additional capabilities and features, including incorporation of next generation T400/T501 products," said Steve Parker, Manager of RT Logic's Test and Measurement Solutions Group. "The TSIM, unique in the industry, allows spacecraft and transponder manufacturers the ability to verify TDRSS signal interfaces during integration and test activities."
The TSIM receives command data and generates the TDRSS spread spectrum forward link signal. The forward link signal contains the command data modulo-2 added to a command Pseudo-random Noise (PN) sequence and a ranging PN sequence. The two PN sequences are modulated in an unbalanced Quadrature Phase-Shift Keying (QPSK) format. The TSIM receives the return link RF signal and demodulates either the Data Group 1 (spread) or Data Group 2 (non-spread) modes. The return link signal is modulated in a staggered QPSK format known as Staggered Quadriphase PN (SQPN), and allows data to be placed on both the I and Q phases. The TSIM recovers this data and outputs data and clock for both I and Q streams. Epochs from the forward and return links are used to calculate range measurements. A Doppler simulator allows any Doppler profile to be easily simulated. The TSIM can also simulate the Point A side of the space-to-space link.
As a fully integrated system, the TSIM includes an intuitive, user-friendly graphical user interface for equipment configuration and status. The modularity and configurability of the underlying software-defined architecture allows for tailoring of the standard TSIM to specific customer requirements.
For additional information on the RT Logic TDRSS TSIM, T400 and T501, please visit http://www.rtlogic.com/products.php.
The Integral Systems family of companies, including RT Logic, will be exhibiting at the 2010 National Space Symposium, booth 408.
ABOUT INTEGRAL SYSTEMS
Integral Systems, Inc., of Columbia, MD, applies more than 25 years experience to provide integrated technology solutions for satellite communications-interfaced systems. Customers have relied on the Integral Systems family of companies (Integral Systems, Inc., Integral Systems Europe, Lumistar, Inc., Newpoint Technologies, Inc., RT Logic, and SAT Corporation) to deliver on time and on budget for more than 250 satellite missions. Our dedication to customer service has solidified long-term relationships with the U.S. Air Force, NASA, NOAA, and nearly every satellite operator in the world. Integral Systems was named the Region III Prime Contractor of the Year by the U.S. Small Business Administration in 2009. For more information, visit www.integ.com.