Overview

CRFS has developed a proprietary simulation and RF planning tool - RFeye Sim. This can be used to analyse the geolocating capabilities of individual receivers and networks of receivers over a wide geographic area for a variety of transmission sources. It can also be used to demonstrate the comparative performance benefits of the RFeye over other receivers, as well as for planning and optimising receiver positions at customer locations.

To receive a free demo copy of RFeye Sim, please contact us.

TDOA overlay

The TDOA simulation enables the performance of the system to be investigated for different transmitters and receiver/transmitter positions. The display transparency can be adjusted for better picture quality or when overlaying AOA or POA data to see the comparative performance of each. Different transmitter positions can be simulated with the probability of transmitter shown as a varying overlay colour.

AOA overlay

The AOA technique involves the use of multiple antennas at each receiver site and the antenna pattern with frequency, number of antennas and various system offsets are all simulated in the full version of RFeye Sim. In the demo version the user is limited to six antennas with a given beam pattern. The key comparison of AOA with TDOA or POA is that any source of RF can be geolocated including very rapid burst transmissions. A typical AOA simulation is shown with fixed receiver and transmitter locations.

If the transmission source is a narrow band frequency hopping transmitter then the TDOA algorithm struggles to work out the position of the transmission source where as AOA still manages to geolocate the target.

POA overlay

Using power on arrival (POA) technique generally works best at specific distances from the transmitter depending on power and what clutter and general absorbers are in the area. However POA has been included in this line of sight propagation simulation model to show the how the technique works as a supplemental geolocation technique along with AOA and TDOA. The plot shows the probability of receiver position based on the received power at each receiver site.

TDOA, AOA and POA overlay

All three techniques can be enabled and the transparency settings for each adjusted in order to see the contribution from TDOA, AOA and POA combined in the map overlay.

Regular Technical Notes and Product Updates are issued by CRFS on all latest developments.