Roger GPS Systems

Roger GPS


GPS repeaters for Aircraft HangArs

The structure of an aircraft hangar can block the ingress of gps signals, making it impossible to test on-board navigation equipment without pushing the aircraft outside where it has a view of the sky.

GPS repeater in hangar

A GPS repeater system overcomes this physical barrier by transferring the outdoor signals to the interior of the hangar, which means all maintenance work can be carried out indoors.

A GPS repeater system installed in an aircraft hangar:

  • Receives the satellite signals via an external GPS antenna.
  • Sends the signals down a coaxial cable to a repeater unit (sometimes multiple units) inside the hangar.
  • The repeater amplifies and re-radiates the signals indoors so that all GPS receivers within range can use the outdoor signals.


In a military situation, the same applies regarding the ability to carry out maintenance without leaving the safety of the hangar.

Additionally, a fighter jet would normally experience a satellite acquisition delay when exiting the hangar in a hurry – the time-to-first-fix (TTFF) could be a dangerously long period of time.

A GPS repeater ensures that fighters always have GPS lock when inside the hangar to ensure there is no satellite acquistion delay upon exit


The repeater unit has a built-in re-radiating antenna with a beam width >160 degrees.

The coverage area achieved is partly determined by the hight of the repeater above the ground.

Generally – one repeater unit placed 10M above ground level will provide coverage within a 35 – 40M radius.

This typical 150m x 75m hangar has virtually full coverage from two GPS repeater units mounted 12 metres above ground level

Repeaters can also be wall-mounted with their signal beaming horizontally across the indoor space; signal will reach up to 50m in clear space


GPS repeaters for fire stations

This is not necessarily an issue when the appliances are parked; however when they leave the station it can sometimes take several minutes to re-acquire a GPS fix.

During these first few crucial minutes on a callout the appliance would be transmitting incorrect (stale) location data to the command and control centre.

Any other satellite navigation kit (such as TomTom/Garmin devices, will be similarly affected, potentially increasing response time.

A GPS repeater system installed in a fire station ensures that:

  • All appliances receive a “live” GPS satellite signal while parked.
  • Satellite navigation equipment in all rescue vehicles is “locked on” to the GPS satellites at all times when indoors.
  • When appliances leave the station they already have GPS lock and will transmit accurate location data to the command and control centre.
  • There is zero satellite-acquisition delay when exiting the fire station.
  • No need to reboot the on-board system while en-route to an incident.


Repeater systems are available to cover the following frequencies:

  • L1 (1575 MHz)
  • L2 (1227 MHz)
  • GLONASS (1602 MHz)
  • Galileo (1575 MHz)

An L1 system is the most popular option; the addition of an L2 signal gives a much more accurate positional fix and is widely used in military and civil aviation applications.

The Russian GLONASS signals and European Galileo signals are also available.



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Scaldwell, Northamptonshire


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