The Antenna FR accepts as input the carrier signal that shall either be radiated into space or into a water load, provided the given FR instance has the transmit capability.
It provides as output the carrier signal received from space to the Ccsds401SpaceLinkCarrierRcpt FR or the Ccsds415SpaceLinkCarrierRcpt FR and the azimuth and elevation pointing angles to the TdmSegmentGen FR and NonValRmDataCollection FR, provided the given FR instance has the receive capability. The pointing angles are provided only while the antenna is in some form of 'closedLoop' pointing mode.
For the correction of radiometric observables weather data are required which should be collected close to the antenna used to obtain the radiometric observables. Therefore the Antenna FR is regarded as the source of the weather data provided to the TdmSegmentGeneration FR and the NonValRmDataCollection FR.

Note: An Antenna FR may be limited to 'transmit-only' or 'receive-only'.

This parameter identifies the antenna that is involved in providing a given support. The antenna may either be identified by its name where typically this name is defined by the operating agency so that no guarantee can be given that the identifier is globally unique. Alternatively the antenna may be officially registered in SANA in which case it has a globally unique Object Identifier. Knowledge of which antenna is being used is needed for a number of aspects, e.g. to assess the observed signal levels with respect to the antenna performance or to perform time correlation that requires knowledge of the exact geographical location of the given antenna.
Note: In case the antennas used for uplink and downlink are not identical, the Functional Resource (FR) instance number shall be used to differentiate them.
Antenna arrays will be modeled by a dedicated FR type

This parameter reports the current antenna elevation pointing in 1/1000 degrees, where 0 degrees corresponds to pointing to the horizon and 90 degrees corresponds to zenith pointing. Depending on the way the antenna is built, values above 90 degrees may be reported in cases where the antenna enables such elevation range as to mitigate the azimuth singularity at zenith. For antennas with a mount different from elevation over azimuth (e.g. x/y mount), the antenna pointing shall be converted to the azimuth/elevation presentation. This also applies to antennas having a tilt mode as to overcome the zenith track singularity.
Note: Time-tagged antenna pointing is regarded a radiometric product and therefore not part of monitoring provided by this FR type.

This parameter reports the antenna elevation pointing in 1/1000 degrees commanded to the servo system while the antPointingMode is either 'programTrack' or 'closedLoop', where 0 degrees corresponds to pointing to the horizon and 90 degrees corresponds to zenith pointing. Depending on the way the antenna is built, values above 90 degrees may be reported in cases where the antenna enables such elevation range as to mitigate the azimuth singularity at zenith. For antennas with a mount different from elevation over azimuth (e.g. x/y mount), the antenna pointing shall be converted to the azimuth/elevation presentation. This also applies to antennas having a tilt mode as to overcome the zenith track singularity.

This parameter configures and reports the elevation in 1/1000 degrees the antenna shall point to when the pointing-mode is set to 'fixedPosition', where 0 degrees corresponds to pointing to the local horizon and 90 degrees corresponds to zenith pointing. Depending on the way the antenna is built, values above 90 degrees may be reported in cases where the antenna enables such elevation range as to mitigate the azimuth singularity at zenith. For antennas with a mount different from elevation over azimuth (e.g. x/y mount), the antenna pointing shall be converted to the azimuth/elevation presentation. This also applies to antennas having a tilt mode as to overcome the zenith track singularity.

The parameter configures and reports the elevation angular rate in 1/1000 degrees per second at which the antenna shall move when the antPointingMode is set to 'slew'.

This parameter reports the elevation residual (actual elevation in closed-loop tracking minus the elevation calculated for antPointingMode = 'programTrack') in 1/1000 degrees. Consequently this parameter will only be valid if antPointingMode = 'closedLoop'. Antennas not having or not being operated in any closed-loop tracking mode cannot provide this parameter and in this case the parameter shall be flagged as unavailable.
Note: Time-tagged antenna pointing is regarded a radiometric product and therefore not part of monitoring.

This parameter reports the elevation aberration relative to the forward beam and the return beam in 1/1000 degree. In case the provider applies aberration correction, the effect of this correction shall be factured into the aberration values reported.
A valid parameter can only be reported if antPointingMode is 'closedLoop' or 'programTrack'.

This parameter configures and reports the settings applied to 'closedLoop' antenna pointing mode, either to monopulse tracking or to conical scann tracking.

This enumerated parameter configures and reports the polarization of the channel that shall be used for tracking purposes. If 'autoHysteresis' is chosen, the parameter specifies how much larger in 1/10 dB the power observed for the unselected polarization must be before a switch-over to the polarization with the stronger signal is performed.

If the same receiver is used for telemetry reception and antenna steering, setting of this parameter is not possible and the value reported by this is a copy of the ccsds401CarrierRcptPolarization parameter or a TBD parameter of the CCSDS 415 Return Channel Reception FR Set.

This parameter configures and reports the nominal return carrier frequency disregarding any Doppler shift.

If the same receiver is used for telemetry reception and antenna steering, setting of this parameter is not possible and the value reported by this is a copy of the ccsds401CarrierRcptNominalFreq parameter or a TBD parameter of the CCSDS 415 Return Channel Reception FR Set.

This enumerated parameter configures and reports for which condition the Doppler predicts have been calculated. It can take on four values:
- none: no information regarding the expected Doppler shift is available and therefore the nominal frequency is used;
- oneWay: this mode will be used when the spacecraft is not locked to a forward link signal or while the spacecraft transponder is commanded to non-coherent mode or when the spacecraft receiver is in 'coherency enabled' mode and the forward link carrier frequency is ramped such that the Doppler on the forward link is compensated, i.e., the spacecraft always 'sees' the nominal forward link frequency; in this case it does not matter if the forward link is radiated by the same station as the one that is receiving the return link or a different station;
- twoWay: this mode is applied when the spacecraft receiver is commanded to 'coherency enabled' mode and the station that is receiving the return link also radiates the forward link, the latter at a constant frequency;
- threeWay: this mode is applied when the spacecraft receiver is in 'coherency enabled' mode and a station different from the one receiving the return link is radiating the forward link signal at a known constant frequency.

If the same receiver is used for telemetry reception and antenna steering, setting of this parameter is not possible and the value reported by this is a copy of the ccsds401CarrierRcptPredictMode parameter or a TBD parameter of the CCSDS 415 Return Channel Reception FR Set.

This enumerated parameter configures and reports the order of the carrier tracking loop. It can take on the following values:
- 'first order': such loop is hardly ever used because it has a static phase error even in case of a constant return link carrier frequency;
- 'second order': this is the most commonly used loop as it has no static phase error for a constant return link carrier frequency;
- 'third order': such configuration may have to be used in case of high Doppler rates, as such loop has no static phase error even when the return link carrier frequency is sweeping, but initial acquisition is more difficult with such loop.

If the same receiver is used for telemetry reception and antenna steering, setting of this parameter is not possible and the value reported by this is a copy of the ccsds401CarrierRcptOrderOfLoop parameter or a TBD parameter of the CCSDS 415 Return Channel Reception FR Set.