Roger GPS Systems

Roger GPS

Systems 

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.

GPS REPEATER IN A MILITARY HANGAR

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

COVERAGE AREA

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.

GPS FREQUENCY BANDS COVERED

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.

 

Address

Truffell House, High Street,
Scaldwell, Northamptonshire
NN6 9JP

Phone

Tel: 01604-880550
Mobile: 0797 052 1911