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.

The Antenna FR provides as output the carrier signal received from space to the Ccsds401SpaceLinkCarrierRcpt FR or the Ccsds415SpaceLinkCarrierRcpt FR and to open-loop receivers. The azimuth and elevation pointing angles are forwarded 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 azimuth and elevation pointing in 1/1000 degrees commanded to the servo system while the antPointingMode is either 'programTrack' or 'closedLoop', where for the azimuth 0 degrees corresponds to pointing north and 90 degrees corresponds to pointing east while for the elevation 0 degrees corresponds to pointing to the horizon and 90 degrees corresponds to zenith pointing. Depending on the way the antenna is built, azimuth values above 360 degrees may be reported in cases where the antenna enables such azimuth range as to mitigate the cable unwrap issue. Elevation 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 azimuth and elevation angular rates in 1/1000 degrees per second at which the antenna shall move when antPointingMode is set to 'slew'.

This parameter reports the azimuth residual (actual azimuth in closed-loop tracking minus the azimuth calculated for antPointingMode = 'programTrack') and 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 enumerated parameter configures and reports the pointing mode of the antenna servo system. The values this parameter can take on are:
- 'stow': the antenna is in or is moving to its stow position; the angular rates applied in this case are not those specified by the antContrAngularRate parameter, but depend on the specifics of the antenna implementation;
- 'halt': the antenna has been stopped in its current position;
- 'fixedPosition': the antenna is moving to or has moved to the specified azimuth and elevation;
- 'slew': the antenna is moving at commanded angular rates;
- 'programTrack': the antenna is pointed in accordance with spacecraft trajectory predicts;
- 'closedLoop': the antenna is pointing in closed-loop mode.

Antenna implementations will typically support only a subset of the above listed pointing modes.

This parameter reports the mode in which the return signal is tracked for antenna steering provided the antPointingMode = 'closedLoop'. The mode is chosen depending on the modulation scheme.
The values the parameter may have are:
- 'carrierTrackingMode': the receiver tracks the remnant carrier by means of a carrier tracking PLL when ccsds401CarrierRcptModulationType is either 'subcarrier' or 'direct';
- 'crossCorrelationMode': the receiver tracks the return link signal by means of checking for the spectral symmetry when ccsds401CarrierRcptModulationType is neither 'subcarrier' nor 'direct'.

This parameter reports the amount of precipitation in mm that accumulated since 0:00 UTC of the current day.

This parameter reports the return link signal level in tenth of dBm as observed by the tracking receiver, i.e., the signal level derived from the tracking receiver AGC reading. The reported value referes to the nominal polarization selected by the parameter antTrackingSignalPolarization. As to have comparable, i.e., station level plan independent values, the level reading should be calibrated to the LNA input. Due to the levels to be expected, the numbers will always be negative.

If the same receiver is used for telemetry reception and antenna steering, the value reported by this is a copy of the ccsds401CarrierRcptSignalLevel parameter or a TBD parameter of the CCSDS 415 Return Channel Reception FR Set.

If a tracking receiver is not available or not used, this parameter shall be flagged as undefined.
In some implementations one receiver may be used both for antenna tracking and reception of telemetry and ranging. If so, the parameters of that receiver will be represented in both the Antenna FR type and the Rtn401SpaceLinkCarrierRcpt FR type.

This parameter configures and reports the bandwidth in Hz centered around the antTrackingRxNominalFreq, possibly corrected for the expected Doppler offset (as configured by the antTrackingRxPredictMode parameter) in which the receiver shall search for the carrier signal. This parameter is also valid in case of a suppressed carrier modulation scheme.

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 ccsds401CarrierRcptFreqSearchRange parameter or a TBD parameter of the CCSDS 415 Return Channel Reception FR Set.

This parameter configures and reports the single-sided tracking loop bandwidth in tenth Hz of the receiver. Depending on the mode the tracking receiver operates in, this is either the bandwidth of the PLL tracking the remnant carrier or the frequency range observed for checking spectral symmetry.

This parameter also configures and reports the duration in seconds within which the bandwidth reduction to a newly commanded loop bandwidth shall be reached. This gradual change of the loop bandwidth is intended to avoid loss of lock. The duration for the gradual bandwidth change can be set to 'auto' or set to a specific duration. If the duration is set to '0', the newly commanded bandwidth is applied immediately.

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 ccsds401CarrierRcptTrackingLoopBwdth parameter or a TBD parameter of the CCSDS 415 Return Channel Reception FR Set.

This parameter configures and reports the status of the Anti-Side-Band system of the tracking receiver. The spectrum is expected to be symmetrical around the carrier. In the absence of this symmetry one can conclude that the receiver did not lock on the carrier but on some side band and acquisition will be restarted if the antTrackingRxAntiSideBandStat is 'enabled'. For very weak signals the wide bandwidth required to check the spectral symmetry may prevent signal acquisition due to the reduced sensitivity. Therefore the Anti-Side-Band system can be turned off, i.e., antTrackingRxAntiSideBandStat is set to 'disabled'. If the receiver does not have an Anti-Side-Band system, the reported value shall be 'notApplicable' and configuring of the parameter is prevented by the guard condition.

This parameter configures and reports the SNR threshold of the received signal at which the transition from the antPointingMode from 'fixedPosition' to 'closedLoop' or 'programTrack' shall occur. In case of the transition to 'programTrack' the time offset observed for the signal acquisition is applied when accessing the trajectory predicts.

In case of a remnant carrier, the threshold specifies the carrier power to spectral noise density ratio in dBHz. In case of the carrier being suppressed, the threshold specifies the data power to spectral noise density ratio in dBHz.

This parameter is used for contingency acquisition, i.e., when the spacecraft trajectory is somewhat uncertain and the spacecraft may be early or late with respect to the time when signal acquisition at the antenna 'fixedPosition' pointing was expected.