Why choose Globalstar?
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When your business centers around remote worksites and working in remote areas beyond cellular and traditional landline service, reliable communications are vital to your success. Discover the advantages Globalstar products and services offer that can help imporve your business efficiency and productivity.
Affordabililty
With minutes starting as low as 14 cents Globalstar satellite service is affordable for any business operating in remote areas. Plans start from $39.99 a month.
Clarity of Voice
CDMA technology makes Glboalstar calls exceptionally secure and clear, with high quality voice transmissions.
No Perceptible Voice Delay
Use of LEO satellites, moving at an altitude of 1,414 Kilometers helps virtually eliminate voice delay, compared to the noticeable time delay and echo effect of calls on GEO satellites which orbit at much higher elevations.
Reliability
The Globalstar system software resides on, and is monitored from the ground, for quick and economical system maintenance and upgrades.
Lighter, Three-in-one Handsets
The Globalstar GSP-1600 mobile phone is three phones in one with built-in technology to easily access 800 MHz analog cellular, digital CDMA cellular, as well as the Globlastar satellite system. Many accessories such as car and marine kits are available which greatly extend the phones capabilities and value.
Superior Data Speeds
Glboalstar offers the fastest satellite data speeds of any handset in the industry allowing you to transfer your data quickly.
GLOBALSTAR'S TECHNOLOGY
LEO Satellites
A Low Earth Orbit (LEO) is any Earth orbit up to approximately 1,500 Kilometers in altitude. LEO satellite systems offer significant advantages over Geosynchronous (GEO) systems for the delivery of mobile satellite services (MMS). These advantages result from an orbit selection that enhances the quality of services to low power mobile hand held and vehicle mounted user equipment. GEO satellite systems, located at an altitude of 35,800 Kilometers above the Earth, are best suited for their missions of high-speed data, television transmission, and other wideband applications.
Globalstar will provide capacity even when a satellite fails, due to the rotation of its LEO constellation. A GEO system would suffer an entire regional system outage if an operational satellite were to fail. Furthermore, current and future planned GEO systems cannot service the personal communications market due to the expense of supplying adequate satellite power and practical deployable antenna sizes.
Path Diversity
Path Diversity is a patented method of signal reception that permits the combining of multiple sugnals of varying power strengths into a single, coherent signal. Subscriber terminals will be able to operate with a single satellite in view, even though two to four satellites will be overhead.
Subscriber terminals will communicate with as many as three satellites simultaneously and, with use of a rake receiver, will combine those signals into a single, static free signal. Subscriber terminals will also alter their power levels to compensate for shadowing and interference as needed, with an average power output range of between 50-300 mw (MegaWatts).
As satellites are constantly moving in and out of view, they will be seamlessly added to and removed from the calls in progress, thereby reducing the risk of call interuption. This will enable the Globalstar system to provide service to a wide variety of locations, with less potential for signal blockage from buildings, terrain or other natural features.
CDMA Technology
Globalstar utilized a version of Code Division Multiple Access (CDMA) technology baased upon the IS-95 CDMA standard to provide high quality, digitally crisp voice, data and fax services. This standard utilizes digital transmission methods in which users share time and frequency allocations, and are assigned by unique assigned codes. The signals are separated at the receiver by using a correlator that accepts only signal energy from the desired circut. Undesired signals are ignored as merely being noise. This technology allows a large number of wireless users simultaneously to access a single radio frequency channel orthogonally reducing interference, thereby resulting in a manyfold increase in capacity when compared to analog systems such as Frequency Dicision Multiple Access (FDMA).
Globalstar has adapted a combination of FDMA with CDMA and spread spectrum modulation that enables it to suppost multiple users simultaneously, and to share its allocated frequencies with other CDMA systems. Globalstar believes that CDMA, combined with the path diversity offered by multiple satellites, results in higher call quality and fewer dropped calls when handing off between satellites, while minimizing interference with other users sharing the same spectrum allocation.