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# Introduction

FREND products present in the Planetary Science Archive (PSA) come from two different sources: calibrated products are generated by FREND instrument team, all other products are generated at the Science Operations Centre at ESAC (European Space Astronomy Center). Further details can be found in the EAICD (ftp://psa.esac.esa.int/pub/mirror/ExoMars2016/em16_tgo_frd/document/EAICD/).

• Raw and Partially Processed products: Version 2
• FREND Dosimeter Calibrated products: Version 1 to be released in 2021
• FREND Neutron Detector Calibrated products: Version 1 to be released in 2021

Note that the PSA stores all versions, so it's possible to retrieve e.g. version 1 of the raw products. It is advisable however to always use the latest version available.

# Delivery Status

• Raw and partially processed products are generated daily
• Calibrated products are scheduled to be delivered by the FREND team approximately every six months
• FREND products will be publicly available based on a six month roll out plan (TBC) after peer reviews

# FREND Filenames

• frd_processinglevel_datatype_(subinstrument)_time

# FREND Data Types

 Primary Data Processing Level Description Raw Raw data as read from the instrument. Consists of housekeeping telemetry (engineering data), FREND Neutron Science data (counts in detectors), FREND Dosimeter Science data (radiation environment measurements). All 3 types of data are time series. This data product is produced automatically by ESAC.Examples: Raw science neutron detector product: frd_raw_sc_n_20200303t180000-20200303t235959Raw science dosimeter product: frd_raw_sc_d_20200328t120000-20200328t175959Raw housekeeping product: frd_raw_hk_20200328t120000-20200328t175959 Partially Processed Only Housekeeping telemetry is processed to this level – all engineering units converted to physical units (temperatures, voltages, instrument time etc).This is the last data level for FREND Housekeeping.Example:  frd_par_hk_20200303t180000-20200303t235959 Calibrated For all 2 science types of data defined above: all engineering units converted to physical units (temperatures, voltages, instrument time etc). Instrument engineering effects are removed from scientific data (temperature drifts, detector on/off efficiency curves, effects based on SC altitude corrected etc). These are time series.Examples: Dosimeter calibrated product: frd_cal_scdh_20190801t001100-20190822t094400Neutron Detector: TBA

See the EAICD for more details.

# Current Issues

Issue

Affects

Version

Status
PDS is changing its LID convention for instruments. This will require a change from
• urn:esa:psa:context:instrument:frend.tgo
to
• urn:esa:psa:context:instrument:tgo.frend

Coordination is required to make this update as it has an impact on ingestion and the PSA database. Coordination between all missions and instruments is required.

1.x, 2.xIn analysis
The lid for the EAICD is incorrect and needs to be rectified with the lid contained in the products1.xIn analysis
ExoMars namespace and instrument contexts are not yet registered in the PDS system, therefore the validator by default will not work. Workarounds are adding the missing items in file validate-1.23.1/resources/registered_context_products.json or running the validator skipping the check on context (--skip-context-validation)--
The lids of calibrated products are currently under revision and will be changed to respect the format
<instrument_acronym>_[<processing_level>]_[<type>]_[<subunit>]_<descriptor>
1.xIn analysis
NASA validator tool (https://nasa-pds.github.io/validate/) resolves the https PSA protocols with the latest Java version. If validate does not resolve the dictionaries, please consider updating your Java version--

# Fixed Issues

Issue

Affects

Version

When FixedData Processing Fix VersionPSA Fix Version
The current context lid_reference
• urn:nasa:pds:context:target:calibration.non_science

has been deprecated by PDS. The new context/LID will be:

• urn:nasa:pds:context:target:calibrator.non_science
1.x, 2.x2020-04-06DPS-3.8Not Applicable
For older Raw products, the URLs pointing to PDS and PSA dictionaries are http instead of https. This has been corrected recently and newer products reflect the change. Older products will be aligned in the next bulk reprocessing. Note that for FREND calibrated products the URL for the PDS schematron still points to http instead of https. This will be corrected for future  deliveries. 1.x, 2.x2020-01-30DPS-3.4Not Applicable
In the UI, for some products, the fields Wavelength Range  and Instrument Type show the incorrect value of "Not Available". 2.xMay 2020Not ApplicablePSA 5.9
Currently there are multiple problems associated with the 'on the fly' generated collection and bundle inventory files. The issues are understood, how to implement to the fix is in analysis.1.x, 2.x2020-10-19Not ApplicablePSA 5.10

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