1. Which frequency ranges does FRIDA support?

FRIDA supports frequency ranges from 2 MHz to 40 GHz.

See White Paper for details.

2. Which propagation models does FRIDA support?

FRIDA has the following models:
- HF skywave model better than ITU REC 533
- HF groundwave model GRWAVE (ITU 368-6)
- Free space loss, ITU-R P.525
- Hata loss formula (configurable)
- Diffraction method, Picquenard MKE, Multiple Knife Edge

See White Paper for details.

3. Which map formats may be used?

FRIDA is based on MARIA GIS and all map formats for MARIA may be used.
For the propagation models, the DTED data is necessary. A high accuracy level of the DTED data gives high probability in the coverage calculations.

See White Paper for details.

4. Which radio types does FRIDA support?

FRIDA has a build in equipment editor. This allows all radios types to be created and used.

See White Paper for details.

5. How to get started?

FRIDA has a build-in Order of Battle Manager (OBM). In this the user builds his organisation and adds radio nodes with equipment. In the OBM the user also creates all the radio nets that are available for the current scenario.

6. What is the typical structure of a command post/headquarters?

A typical command post is subordinated to specific unit. The command post has several vehicles or other types of communication carriers attached to it. These may be organically attached to the command post, or detached from another unit. In the carriers the radio stations or radio sets are installed.

7. What is attachment and detachment of radio nodes and what is the consequence of this action?

When a radio node/vehicle is attached from another unit, it will be placed in the map where the reinforced unit is located.

8. When running frequency requirement, is it possible to ask for additional frequencies (spare frequencies)?

Yes. FRIDA will calculate the minimum frequency requirement for a given scenario, but the user may add spare frequencies to each frequency band.

9. What is the definition of collocation and what are the consequences when radios are collocated/co-localised?

All emitters in a command post are treated as co-localised (internal separation is less that 200 meters and calculates frequency separation requirements based on the radio type) when FRIDA calculates interference when assigning frequencies. Radios in the same vehicle are treated as co-located (calculates both harmonic and intermodulation products, includes also requirements based on the radio type) when FRIDA calculates interference.

10. What is noise level in a node?

Noise level is the sum of background noise in a given location and the noise produced by the radio node itself. This may be measured and described in FRIDA, or the standard value may be used. The standard value is based on a typical military radio carrier’s noise.