Frequency Assignment Planning

Click here to load reader

  • date post

    21-Jan-2016
  • Category

    Documents

  • view

    35
  • download

    0

Embed Size (px)

description

Frequency Assignment Planning. Prepared by Torsten Jacob ICAO ANB/CNS. General Methodology. The electromagnetic compatibility of radio equipment should be calculated by the following method: determine the desired signal level at the victim receiver front end; - PowerPoint PPT Presentation

Transcript of Frequency Assignment Planning

  • Frequency Assignment PlanningPrepared by Torsten JacobICAO ANB/CNS

    MID Office, Cairo, 4 6 June 2006

  • General MethodologyThe electromagnetic compatibility of radio equipment should be calculated by the following method:determine the desired signal level at the victim receiver front end;determine the resulting level of interference at the victim receivers front end;determine the interactive effects among wanted signals, interference and receiver characteristics for various frequency or distance separations;determine the appropriate propagation model to be used; anddetermine, from these data, a relationship between the frequency separation and distance separation that the interference is considered tolerable.

    MID Office, Cairo, 4 6 June 2006

  • Free Space Propagation ModelThe propagation loss that would occur if the antennas were replaced by isotropic antennas located in a perfectly dielectric, homogeneous, isotropic and unlimited environment, the distance between the antennas being retained (see Recommendation ITU-R P.525).

    MID Office, Cairo, 4 6 June 2006

  • Aeronautical Standard Propagation Model Aeronautical standard propagation model (ASPM) is derived from the ITU-R Recommendation P.528. For distances up to the radio horizon, free space propagation is assumed. Beyond the radio horizon, a constant attenuation factor a, which depends on the frequency band under consideration, is used.

    MID Office, Cairo, 4 6 June 2006

    Tx

    Rx

    k

    R

    E

    h

    Rx

    h

    Tx

    d

    RH

  • Radio horizonIf both heights hTX and hRX are expressed in feet (ft), the distance d in Nautical Miles (NM), the Earth radius RE=6360km and if the atmospheric conditions are assumed to be normal (effective Earth radius factor k=4/3), the following practical formula can be used to calculate the radio horizon:

    MID Office, Cairo, 4 6 June 2006

  • Aeronautical Standard Propagation ModelThe propagation loss in dB between two isotropic antennas located in a perfectly dielectric, homogeneous, isotropic and unlimited environment can be calculated as follows:

    MID Office, Cairo, 4 6 June 2006

  • VHF COMGeneral principles for VHF voice communication:To protect a service with a circular operational coverage (circular service), the distances from the edge of the service to another airborne or ground transmitter must be 5 times the range of that circular service; if the other transmitter is below the radio horizon from that service edge and the radio horizon distance is also less than 5 times circular service range then radio horizon distance is to be used;

    MID Office, Cairo, 4 6 June 2006

  • VHF COMGeneral principles for VHF voice communication:To protect a service with a non-circular operational coverage area the ground or airborne transmitter of the other service must be below the radio horizon;the protection criteria for both the requested service and the existing assignment must be met for a valid assignment.

    MID Office, Cairo, 4 6 June 2006

  • VHF COM

    MID Office, Cairo, 4 6 June 2006

    AFIS

    TWR 16/FL30

    TWR

    25/FL40

    APP

    25/FL100

    APP

    40/FL150

    ATIS

    60/FL200

    APP

    50/FL250

    VOLMET

    261/FL450

    ACC

    FL150

    ACC

    FL245

    ACC

    FL350

    ACC

    FL450

    AFIS/TWR (16/FL30)

    80

    125

    125

    200

    241*

    250

    328*

    218*

    260*

    298*

    328*

    TWR

    25/FL40

    125

    125

    125

    200

    252*

    250

    339*

    228*

    270*

    308*

    339*

    APP

    25/FL100

    125

    125

    125

    200

    297*

    250

    384*

    274*

    316*

    353*

    384*

    APP

    40/FL150

    200

    200

    200

    200

    300

    250

    412*

    301*

    343*

    381*

    412*

    ATIS

    60/FL200

    241*

    252*

    297*

    300

    114*

    300

    201*

    300

    300

    300

    300

    APP

    50/FL250

    250

    250

    250

    250

    300

    250

    455*

    345*

    387*

    425*

    455*

    VOLMET

    261/450

    328*

    339

    384*

    412*

    201*

    455*

    0*

    412*

    454*

    491*

    522*

    ACC

    FL150

    218*

    228*

    274*

    301*

    300

    345*

    412*

    301*

    343*

    381*

    412*

    ACC

    FL245

    260*

    270*

    316*

    343*

    300

    387*

    454*

    343*

    385*

    423*

    454*

    ACC

    FL350

    298*

    308*

    353*

    381*

    300

    425*

    491*

    381*

    423*

    460*

    491*

    ACC

    FL450

    328*

    339*

    384*

    412*

    300

    455*

    522*

    412*

    454*

    491*

    522*

  • ILSCo-channel protection requirement for ILS localizerMinimum separation between undesired facility (ILS2) and the Protection Point of the desired facility (ILS1) of 80 NM80 NMILS localizer protection point at 25 NM distance and6250 ft heightMinimum separation between second facilityand the protection point of the first facilityILS 1ILS 2UNDESIRED SIGNAL

    MID Office, Cairo, 4 6 June 2006

  • VORUNDESIRED SIGNALVOR 2INTERFERENCE SOURCEVOR 1Co-channel protection requirementMinimum uplink free-space desired-to-undesired signal ratio (D/U) of 20 dB at all points within the desired facilitys service volume

    MID Office, Cairo, 4 6 June 2006

  • DMEDME 2INTERFERENCE SOURCE(S)DME 1Ground facilities channel assignment:Minimum uplink free-space desired-to-undesired signal ratio (D/U) at all points within the desired facilitys service volumeSpecific free-space D/U values are selected in order to guarantee an effective post-processing D/U of 8 dB taking into account frequency and code rejection capabilities of the interrogator receiver

    MID Office, Cairo, 4 6 June 2006

  • More informationMore information on assignment planning principles for systems such as NDB, GBAS, HF voice and data, VDL Mode 2, 3 and 4 etc can be found at:ICAO Annex 10ICAO RF Handbook Doc 9718Publications of ICAO Regional Offices such asFMG Frequency Management ManualNational regulations on aeronautical assignment planning

    MID Office, Cairo, 4 6 June 2006

  • Thank YouAny questions?

    MID Office, Cairo, 4 6 June 2006