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Six years and one thousand GPS repeater systems later …

In early 2012, a friend suggested that I investigate the possibility of bringing GPS repeater systems to market in the UK.

Well, the truth is that my investigations were somewhat half-hearted since I just didn’t “get it”.

I could see how the technology worked but I couldn’t fathom what anyone would want a GPS repeater for.

So maybe I’m not the sharpest implement in the toolbox after all …..

Automotive research facility benefits from GPS, DAB radio and FM radio signal repeater system

To enable development and testing of infotainment systems, FalTech has designed and installed a multi-function repeater system inside a research facility which previously was an RF-denied zone.


Vehicle infotainment consoleIn-Vehicle Infotainment (IVE) and In-Car Entertainment (ICE) systems are integral to most vehicles these days. In this connected world, the minimum expected level of equipment in a new car includes FM/DAB radio and GPS satellite navigation systems.

Not to mention video players, in-car internet and WiFi, USB and Bluetooth connectivity and eCall technology.

One automotive company that FalTech GPS worked with was having a problem with a lack of GPS, FM and DAB signals inside their research building due to the blocking effect of the largely steel structure. The situation caused frustration and delays as the only way to test any of these systems was to take the prototype vehicles outside in order to receive a usable signal.

FalTech GPS attends British APCO annual conference 20 & 21 March 2018

Link to the BAPCO 2018 Exhibition & Conference page

For the fifth year running, FalTech GPS will be exhibiting at the BAPCO annual exhibition and conference in Coventry on 20 & 21 March 2018.

As BAPCO members, we will be there at Stand C20 with our equipment supplier, Roger-GPS, the market-leading manufacturer of GPS repeater systems based in Helsinki, Finland.

So what is our link with BAPCO?

Well, since 2012, FalTech has supplied and installed over 300 GPS repeater systems in fire and police stations across the UK.

Our fire and police services, like most others across the globe, are affected by some specific challenges caused by the lack of GPS signal inside their buildings.

GPS repeaters in fire stations

When inside a fire station, the mobile data terminal (MDT) installed on most appliances will not receive a GPS signal due to the blocking effect of the building structure.

This means that when the MDT transmits its location to the command and control centre, the data is stale and indicates the location when the appliance last had sky-view – just before it entered the fire station.

However, the real problems begin when the appliance leaves the station because it can take several minutes
for the MDT (and satnav devices if present) to re-acquire a GPS fix.

The appliance could be quite some distance away from the fire station before the GPS fix occurs.

This has two main effects:

  1. Fire crews have to find their way to the incident without the aid of the MDT or the satnav device
  2. The command and control centre continues to see the appliance’s location as the fire station long after it left the building

Local knowledge can sometimes aid fire crews to get where they need to be.  However the command centre staff won’t necessarily have the confidence of knowing exactly where their resources are at all times, which means that they are not always able to marshal resources to where they are most needed.

The solution

A GPS repeater system installed in a fire station ensures that MDTs and satnav devices receive live satellite signals at all times.

GPS repeater in a fire station providing continuous signal to MDT and satnav devices

Which means that:

  • The MDT reports accurate, up-to-date location information at all times.
  • Satnav devices maintain a GPS fix while indoors.
  • There is no satellite acquisition delay on exiting the station.
  • Response times minimised and public safety enhanced.

There is a full description of how a GPS repeater works in a fire station here.

GPS repeaters in police stations

The issues faced by police officers are similar in nature to those seen by firefighters; when they go indoors and their personal radios stop receiving a live GPS signal they continue to transmit stale location data.

When exiting the police station the officer may get into a vehicle and head off to an incident before the radio has a chance to acquire GPS lock.

As far as the command and control centre is concerned, the officer’s location appears on the status screens as back at the station, when in fact he or she could be several miles away.

It doesn’t help that the officer and the radio is in a steel box (police car) and the GPS acquisition delay is prolonged.

A GPS repeater system installed in a police station ensures that personal radios receive live satellite signals at all times.

Which means that:

  • The personal radio device reports accurate, up-to-date location information at all times.
  • There is no satellite acquisition delay on exiting the station.
  • All officers visible at the command centre whether indoors or outdoors.
  • Response times minimised and public safety enhanced.


There is a full description of how a GPS repeater system works in a police station here.

If you are at the BAPCO centre at the Ricoh Arena on 20th & 21st March please do come along and speak with us, we’d be happy to tell you about how we have solved this problem for fire and police services across the UK and further afield.

In fact, you may be interested to see a case study of the largest known repeater system installed in an underground police garage.

If you are attending and would like to meet up, by all means call Phil Whitting on +44 (0) 1326 336 444 or email him and he would be happy to see you.  He may even buy you a coffee!


Do GPS tracking devices work indoors?

And if they don’t, does it matter?

Every day, vast amounts of cargo are transported around the world by land, sea and air.

Keeping track of shipments as they make their way around the globe is often achieved by use of GPS-enabled tracking devices.

Knowing the exact location of a highly valuable consignment of prescription drugs, for example, would surely make any logistics professional sleep better at night.

A tracking device can be fitted to almost anything, in an open or a covert way.

While there are many, many available options and variations on a theme, there are essentially two types of trackers – passive and active.

Passive trackers use GPS location information to record their position (and possibly environmental data such as temperature and humidity) as it makes its journey.

The data is logged within the tracking unit itself and is stored in internal memory or on a memory card and can be downloaded at a later date for analysis on a computer.

Active trackers provide real-time location and environmental information to a central tracking portal. This data can be viewed by the owner of the cargo and/or the tracking company employed to carry out the monitoring on behalf of its clients.

When the shipment is delayed, for example by stormy weather at sea or by leaves on the railway line, the tracking data can be used to update clients with an accurate timeline.

So this isn’t exactly breaking news to those who have been in the asset tracking industry for some time.  I suspect most of us have received a parcel from a delivery courier firm that provides a link to a portal so that you can see the delivery vehicle making its way to your location.

So here’s the question I have in mind: how does a GPS tracking device determine its position when it is under cover?

For example when it’s inside

  • A warehouse
  • The hold of a ship
  • A transport depot
  • A train station
  • An aircraft hangar

The issue is the same for all indoor locations where a container may spend a period of time during its journey.

If there is no sky view the GPS signal can’t penetrate to the interior of the building.





That’s OK, the last time it had a live signal was just before it went into the building, so it must still be in there, right?

Not necessarily …..

When the GPS tracking device loses sight of the sky due to the blocking effect of the building structure, it will continue to report its location periodically as it was just before it entered the building.

Not only would the tracking device be reporting stale, out-of-date location data, there may be a long acquisition delay (possibly several minutes) upon exit as the GPS receiver regains a positional fix.

Using a GPS repeater to maintain sky view while indoors

A GPS repeater relays live GPS signal from the outside of the building to the inside.

This ensures that sky view is available at all times, and the GPS tracker will always be reporting accurate location information to the tracking portal.

An antenna is placed on the roof and a coaxial feeder cable transports the signal to an indoor GPS repeater unit.

The repeater re-radiates the signal inside the facility, providing live sky view to all GPS receivers in the vicinity.

Yes, a GPS tracking system can work indoors, providing end-to-end visibility of cargo

It’s reasonably easy to solve a potentially serious issue.

A GPS repeater kit comes with all you need to provide signal in any indoor space.

We can also create a custom-designed system if the requirement is larger or more complex than a kit can handle; just let us know what you need and we’ll happily work with you to ensure you get the right solution.

Phil Whitting
FalTech GPS
01326 336 444


Does digital radio (DAB) work well indoors?

Do you listen to DAB radio broadcasts?

Maybe you prefer to stick to FM, or even “good old” AM if it’s voice-only programming that you’re interested in.

I recall a friend who was a news announcer on an AM radio station; he always stopped talking when he walked under a bridge …

Today we have a huge range of radio stations available to us. Even satellite TV broadcasters and Freeview TV tuners carry a few dozen radio channels so there isn’t always the need to have separate devices for your viewing and listening needs.

These days quite a lot of programming is consumed on-line, through laptop speakers or smart phone headsets. It isn’t always “live” either; a lot of programs are watched or listened to on a catch-up service.

The (romantic, nostalgic?) concept of listening to the radio doesn’t necessarily mean huddling around an electronic box of tricks these days.

Well, it may be that way in the consumer space; I am more interested in the commercial sector.

More on this subject shortly ……

Will DAB radio ever “catch on?”

Well, contrary to the opinion of a number of journalistic naysayers, the world of radio broadcasting is slowly but surely moving to a situation where FM stations are being replaced by DAB radio.

In January this year, Norway made the bold move of switching over completely to DAB digital radio – the first country in the world to do so. Unsurprisingly perhaps, there has been some backlash from this; about two million cars still have analogue FM radios in them, and presumably countless more exist in homes and offices.

I don’t know why we always have to be first, it isn’t always a good idea is it?

In the UK, the Government has yet to decide on a date to switch over from FM to digital radio completely. Before that can happen, the coverage of national digital radio has to match that of FM; in other words at least 90% of the local population has to have access to digital radio signals.

Again, unsurprisingly, there are a lot of arguments against this inexorable rollout. There are millions of FM radios out there that (arguably) give better sound quality than DAB.

That’s subjective – not for debate here.

And in such rugged terrain, what happens when your reliable FM signal disappears and you don’t have line-of-sight to the nearest DAB transmitter?

There are similarities to the situation when UK TV signals “went digital” during 2007 to 2012. A lot of the population just couldn’t receive a digital TV signal when previously their analogue antenna on/in the roof did a perfect job for them. Some had no choice other than to buy a satellite TV service when they didn’t really want it, or weren’t really able to afford it.

Does DAB radio work indoors?

Not all the time, no.

In common with other radio services (cellular, GPS, Iridium) it isn’t always possible for a signal to penetrate a building’s structure, meaning that you have to go outside to make a phone call, get a GPS fix or use your satphone.

Or listen to your DAB radio.

So, in keeping with the FalTech way of providing indoor signals for GPS and Iridium, we can also provide DAB repeater kits that enable the use of DAB radio equipment indoors. Now these aren’t really intended for use in the home, they are aimed at commercial users.

This applies to a situation where you have a good signal outdoors but it all but disappears when you go inside the building.

For example:

  • Two storeys below ground in a retail store electronics department – how do you demonstrate the latest DAB radio receiver if you are effectively in an underground Faraday cage?
  • If you are in an electronics workshop and need to test DAB receivers, do you need to remove the equipment to the car park to get a signal? Probably.
  • In a car showroom, how do you demonstrate the capabilities of the built-in DAB radio when surrounded by acres of steel-reinforced concrete and tinted glass? You can’t – the car needs to be moved outside.

DAB repeaters are regulator-approved and relatively easy to install.

There is a lot more information within this site about the uses of DAB radio signal repeaters – please take a look and let us know if we can help you with your indoor coverage requirements.

Phil Whitting
FalTech GPS
01326 336 444