Texas Instruments Offers New GPS Software

—Literature Available A new relative-positioning software package, called Geomark, designed to process data collected by TI-4100 Global Positioning System (GPS) Navigators was recently introduced by Texas Instruments.

The Geomark software for GPS provides highly accurate postprocessing positioning information from data collected by two TI-4100 GPS Navigators simultaneously tracking the same four GPS satellites.

The TI-4100 is a satellite-based navigation system that provides precise absolute positioning or relative point-positioning surveys, including aerial surveys, offshore platform positioning, marine navigation and oceanographic and geophysical surveys.

According to John Applegate, marketing manager, commercial GPS, the introduction of the Geomark software gives the TI-4100 user a totally self-contained, on-site collection and postprocessing system that can be used anywhere in the world.

"The software provides comprehensive, documented solutions to relative positioning problems that were previously cumbersome and expensive," he said. "Additionally, Geomark provides these solutions with much greater accuracy, speed, flexibility, ease and economy." Accuracies are obtained using the broadcast ephemeris data recorded by the TI-4100 and do not require the use of precise ephemeris that some GPS systems must obtain from other sources, he added.

The Geomark software provides typical solutions in less than one hour of off-line processing using as little as 30 minutes of collected data, including data cassette translation.

Geomark offers totally automatic operation. Users may enter custom specifications by overriding the automatic defaults. Users can also specify the reference location or derive the location using the TI- 4100. Geomark processes both Precise Code (P-Code) or Coarse/Acquisition (C/A Code). The software uses broadcast empheris, but can also support post-mission precise ephemeris.

Geomark records all necessary data on a one-page report that provides the user with the monumentto- monument baseline vector. The system can provide the answer in standard latitude, longitude, altitude; state plane; UTM; or local datum.

The complete TI-4100/Geomark package is available now and includes Geomark and MS-DOS™ software. The package also includes the TI Portable Professional Corn- puter with 256K bytes RAM, a multifunction board with an additional 256K RAM, a single floppy diskette drive, a 10-megabyte Winchester hard disk drive, an 8087 coprocessor, three-plane graphics board, a built-in high-resolution 9-inch color monitor, two Memtec cassette readers, two RS-232 cables, and the TI 855 microprinter.

For additional information about the TI-4100 and Geomark software, including detail-filled literature, Circle 18 on Reader Service Card

Maritime Reporter Magazine, page 43,  Feb 1986

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