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Re-Radiators are a Repeater system that includes an outside antenna, microprocessor controlled Repeater, transmission antenna and all associated transmission lines and safety devices. Saturn Antenna provides customer specified, ready to be installed complete Re-Radiator systems, especially for GPS .
RE-RADIATORS
Saturn Antennas
gps_constellation.gif
This graphic shows how the GPS & GNSS satellite constellations relationship with the Earths surface changes throughout each day due to the Earths rotation and the orbits of the satellites.
 
From any point on the Earth, the number of satellites visible,  their distance and relative angle to said point is constantly changing.
 
Other factors can affect GPS performance too:
U.S. Government Information Sites for space weather and GPS anomalies are below:
 
http://www.navcen.uscg.gov/?pageName=gpsServiceInterruptions
 
http://www.swpc.noaa.gov/
 
Reradiators are RF systems that take signals transmitted in one area and retransmit it in another area. This method is intended to allow continuous or isolated transmissions into areas that can not naturally support the initial transmission.

The classic example is when an ambient signal is unable to penetrate into a facility, but that signal is required inside the facility. Technically speaking, said signal could be virtually anything e.g. FM radio, TV, police broadcasts, satellite uplinks, handie-talkies and much more.

Realistically speaking, said signal is normally something of high value as such systems generally cost thousands of dollars. The two most common uses of a reradiator is for Cell phone/Data enhancement and the Global Positioning System.
Both use 3 basic components:

1) Outdoor Antenna(s) with transmission lines.
2) Indoor Repeater (transmitter / transceiver)
3) Indoor Antenna(s) with transmission lines.

GPS / GNSS:

GPS in L1 & L2 bands are easily installed to allow GPS users to access the GPS constellations data inside of buildings or vehicles that ordinarily partially or fully block those signals. This allows normal use within the facility or may allow smooth transitions from outside to inside and back outside again without equipment losing a lock on satellites. Relocking on satellite signals can take several seconds to several minutes.

Other Global Positioning Satellite Constellations can also be reradiated such as GLONASS (Russia), Galileo (EU), Beidou (China), COMPASS (China), IRNSS (India), QZSS (Japan). Any and all reradiators must be licensed by the FCC or other appropriate governing body as the system is of course a transmitter. In the United States, GPS transmissions are overseen by Homeland Security as well as the FCC.

The U.S. GPS systems transmit on one frequency in each of two bands. They are both modulated using Phase Modulation and are encoded at 50 bits per second, using CDMA (Code Division Multiple Access) like some cell phone networks. There are 3 more bands in development, each designated for differing uses. In the United States, civilians use the L1 band and the L2 band is restricted for military use.

Everyone nowadays is familiar with using the GPS constellation for navigation, but most are unaware that industries like computer data centers rely on these satellites to provide an Atomic Time Base signal in order to keep servers in synchronization with each other. This method can be actual time accurate to less than 100 nanoseconds and provide synchronization between components to within a few nanoseconds. This method is significantly cheaper than alternative Atomic Clock or 10 MHz systems. The receivers antenna system requires some unique considerations however so a professional should be employed for the installation.

All of these satellite systems use high frequencies and are therefore problematic when signals must be transported between components in coaxial cables since RF losses increase as frequencies increase. These signals are also extremely weak! Microchip manufacturers have made miraculous improvements on the sensitivities of their GPS chips but there is often little room for loss in a reradiating system. The L1 band transmits on 1575.42 MHz and the military L2 band transmits on 1227.6 MHz.

Cell / Data Networks: (Cellular enhancement - this can encompass Distributed Antenna System methods)
These systems are more numerous in frequencies and encoding methods used and are two-way (bi-directional) communications. They are also many times more powerful than GPS systems. Their use is regulated under the FCC and the service provider for which the frequency is licensed. Their use is also much more common as very soon nearly every adult on Earth will be equipped with a cellular device. Their RF bands of operation vary considerably and most operate from one to several of the 700, 800, 900, 1200, 1700, 1900, 2100 and 2500 MHz bands.

The concept is the same as GPS systems... maintain service within RF challenged or RF dead zones. Availability and cost have improved significantly of late, but commercial and industrial users have many more considerations than a home user does. It should be also be considered that reliable cellular service in your business improves employee productivity. If you are a retailer you should be aware that shoppers are ever more vigilant these days at accessing product information and conversing with their inside circle of influence as part of their shopping process. Providing reliable cellular / data service inside of your store will make your customers experience more productive as well.

It is common for other installers to fail to address system operation under emergency conditions or system redundancy or fail-over contingencies. If your power fails or your local cell tower goes down, your enhanced cellular service system also goes down. Saturn Antennas has provisions for common emergencies available for your building cell service.

Regarding security, be aware that hackers have now figured out how to place compromised Enhanced Cellular Zones in areas of high traffic in order to sift information from your cell enabled devices. If commercial business owners provide powerful, high quality enhanced zones in their buildings, it becomes more difficult for hackers to compromise your enhanced cellular zone and penetrate into your employees or customers devices.

WiFi zone enhancers are another type of Reradiator. If your office, building or campus has problems with WiFi coverage, Saturn Antennas can provide enhancements that will fill-in problem areas. We can also provide the means for a powerful, long range Point-to-point 2.4 GHz or 900 MHz wireless link between two computers.

Increased use of wireless communications has opened a Pandora's box of opportunities for Hackers & Crackers. Your wireless system should always incorporate security measures, but Saturn Antennas can assist with improving your office's inherent RF security. RF energy can to a measurable degree, be controlled within your operating area. Techniques and materials can be implemented into your office/building to improve it's natural resistance to RF eavesdropping or intrusion.

It is our hope that someday the FCC will permit the installation of Sirius/XM satellite Reradiators to allow reliable service inside of buildings. In the mean time we can provide high performance exterior antennas that will connect to your indoor receiver.
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