Mctgnavox Introduces Civil Global Positioning System

—Literature Available Magnavox Advanced Products and Systems Company of Torrence, Calif., recently announced the availability of a civil Global Positioning System (GPS) navigator (shown below).

Designated the T-Set, it is a C/A code receiver with system accuracy equal or superior to the Magnavox Z-Set developed under the Phase I Military GPS Program, which demonstrated 30-35 meter dynamic accuracy during field tests.

Actual accuracy obtainable depends upon the quality of orbit parameters and clock corrections transmitted to the satellites.

The T-Set consists of the following components: electronics unit, consisting of VT-103 terminal, PDP-11/23 computer, Magnavox GPS receiver card, and Magnavox positioning and navigation software; antenna assembly; and coaxial cable (100 meters).

Five independent receiver channels are provided in the T-Set to permit continuous tracking of the four currently best satellite signals while the fifth channel gathers ephemeris data from all other potentially useful satellites. This al lows the T-Set both to switch satellites without delay and to respond quickly to vehicle dynamics, thus insuring optimum accuracy at all times.

Differential GPS navigation is a planned option. One T-Set at a fixed site will monitor the available satellite signals and compute range and Doppler corrections. Navigating T-Sets will receive and apply the corrections before computing each navigation solution. Differential accuracy is expected to be five meters or better, taking full advantage of the five-channel receiver design.

Extended naviation coverage is available when altitude is known, e.g., for marine use, by means of the automatic geoidal height correction that permits navigation with only althree satellite signals. With a rubidium or cesium frequency standard, navigation can continue when only two satellites are available.

Data displayed on the T-Set include time, position, speed, course, satellite number, azimuth, elevation, signal-to-noise, range residuals, solution variance, and dilution of precision. Satellite alerts and status data also are displayed. These data plus the almanac, ephemeris, and all pseudorange and Doppler measurements are available via the RE-232 data port. A lower rate of navigation results may be recorded by the internal cartridge tape drive.

The T-Set is intended for sale or lease to customers who are interested in obtaining experience with GPS. The system is designed for operation in a controlled environment.

Environmental, physical, and electrical characteristics of the T-Set are defined by the VT-103 Terminal specification.

The GPS satellites currently in operation are experimental in nature, and the U.S. Government has the right to modify or terminate the operation of these satellites at any time. The sale or lease of the T-Set to customers outside the United States is subject to U.S. Government regulations.

For more information and complete literature on the T-Set, Circle 10 on Reader Service Card

Maritime Reporter Magazine, page 36, Nov 1984

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