## The radio-navigation subsystem LOCnoise

The sublibrary ILS of the library NAVLIB contains two different masked subsystem blocks which implement localizer noise signals: LOCnoise1 and LOCnoise2. See the references below for more details about the theoretical backgrounds.
Other blocks in the ILS sublibrary of NAVLIB are: Nominal ILS signals, GSerr, GSnoise, and LOCerr, and the example system ILS example.

### LOCnoise1

This block generates localizer noise according to AGARD R-632 (ref.[2]), assuming a constant approach speed. The user must specify the scale length Lloc (typically 130 m), the standard deviation sigma_loc (usually <= 15 micro-Ampere), and the approach speed V.

LOCnoise1 doesn't have any inputs.
Outputsignal: Localizer-noise [micro-Ampere]

### LOCnoise2

This block uses a localizer noise filter according to NASA CR-2022 (ref.[3]). The user doesn't have to specify any parameters.

LOCnoise2 doesn't have any inputs.
Outputsignal: Localizer-noise [micro-Ampere]

### References

Apart from the FDC user-manual, the following reference contains more information about the ILS signals:

1. M.O. Rauw: A Simulink environment for Flight Dynamics and Control analysis - Application to the DHC-2 'Beaver', part I: Implementation of a model library in Simulink. Delft University of Technology, September 1993 (also contained in the STAR database of NASA, report number NONP-NASA-SUPPL-DK-94-28027)
2. Anon.: Approach and Landing Simulation. AGARD report 632, Ames, 1975
3. Johnson, W.A., McRuer, D.T.: Development of a Category II Approach System Model. NASA Contractor Report 2022, Washington D.C., USA, 1972