<geo:GeodesyML xmlns:gco="http://www.isotc211.org/2005/gco" xmlns:geo="urn:xml-gov-au:icsm:egeodesy:0.5" xmlns:gmd="http://www.isotc211.org/2005/gmd" xmlns:gml="http://www.opengis.net/gml/3.2" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" gml:id="AMC400USA_20250828">
  <geo:siteLog gml:id="AMC400USA">
    <geo:formInformation>
      <geo:FormInformation gml:id="form-info">
        <geo:preparedBy>Tatevik Shakhbandaryan</geo:preparedBy>
        <geo:datePrepared>2025-08-28</geo:datePrepared>
        <geo:reportType>UPDATE</geo:reportType>
      </geo:FormInformation>
    </geo:formInformation>
    <geo:siteIdentification>
      <geo:SiteIdentification gml:id="site-identification">
        <geo:siteName>Alternate Master Clock (UTC calibrated)</geo:siteName>
        <geo:fourCharacterID>AMC4</geo:fourCharacterID>
        <geo:monumentInscription>NONE</geo:monumentInscription>
        <geo:iersDOMESNumber>40472S005</geo:iersDOMESNumber>
        <geo:cdpNumber>NONE</geo:cdpNumber>
        <geo:dateInstalled>2018-06-20T00:00:00Z</geo:dateInstalled>
      </geo:SiteIdentification>
    </geo:siteIdentification>
    <geo:siteLocation>
      <geo:SiteLocation gml:id="site-location">
        <geo:city>Colorado Springs</geo:city>
        <geo:state>Colorado</geo:state>
        <geo:countryCodeISO codeList="http://xml.gov.au/icsm/geodesyml/codelists/country-codes-codelist.xml#GeodesyML_CountryCode" codeListValue="AUS" codeSpace="urn:xml-gov-au:icsm:egeodesy:0.5">United States of America (the)</geo:countryCodeISO>
        <geo:tectonicPlate codeSpace="urn:ga-gov-au:plate-type">NORTH AMERICAN</geo:tectonicPlate>
        <geo:approximatePositionITRF>
          <geo:cartesianPosition>
            <gml:Point gml:id="itrf_cartesian">
              <gml:pos srsName="EPSG:7789">-1248596.405 -4819428.21 3976505.93</gml:pos>
            </gml:Point>
          </geo:cartesianPosition>
          <geo:geodeticPosition>
            <gml:Point gml:id="itrf_geodetic">
              <gml:pos srsName="EPSG:7912">38.803125 -104.5245972222 </gml:pos>
            </gml:Point>
          </geo:geodeticPosition>
        </geo:approximatePositionITRF>
        <geo:notes/>
      </geo:SiteLocation>
    </geo:siteLocation>
    <geo:gnssReceiver>
      <geo:GnssReceiver gml:id="gnss-receiver-1">
        <geo:manufacturerSerialNumber>RT920013101</geo:manufacturerSerialNumber>
        <geo:igsModelCode codeList="http://xml.gov.au/icsm/geodesyml/codelists/antenna-receiver-codelists.xml#GeodesyML_GNSSReceiverTypeCode" codeListValue="ASHTECH Z-XII3T" codeSpace="urn:xml-gov-au:icsm:egeodesy:0.5">ASHTECH Z-XII3T</geo:igsModelCode>
        <geo:satelliteSystem>GPS</geo:satelliteSystem>
        <geo:firmwareVersion>IL01-1D04-MCF-12MX</geo:firmwareVersion>
        <geo:elevationCutoffSetting>4</geo:elevationCutoffSetting>
        <geo:dateInstalled>2018-04-05T00:00:00Z</geo:dateInstalled>
        <geo:dateRemoved>2018-09-24T23:59:00Z</geo:dateRemoved>
        <geo:temperatureStabilization xsi:nil="true"/>
      </geo:GnssReceiver>
      <geo:dateInserted>2018-04-05T00:00:00Z</geo:dateInserted>
    </geo:gnssReceiver>
    <geo:gnssReceiver>
      <geo:GnssReceiver gml:id="gnss-receiver-2">
        <geo:manufacturerSerialNumber>3013929</geo:manufacturerSerialNumber>
        <geo:igsModelCode codeList="http://xml.gov.au/icsm/geodesyml/codelists/antenna-receiver-codelists.xml#GeodesyML_GNSSReceiverTypeCode" codeListValue="SEPT POLARX5TR" codeSpace="urn:xml-gov-au:icsm:egeodesy:0.5">SEPT POLARX5TR</geo:igsModelCode>
        <geo:satelliteSystem>GPS+GLO+GAL+BDS+QZSS</geo:satelliteSystem>
        <geo:firmwareVersion>5.1.2</geo:firmwareVersion>
        <geo:elevationCutoffSetting>0</geo:elevationCutoffSetting>
        <geo:dateInstalled>2018-09-26T00:00:00Z</geo:dateInstalled>
        <geo:dateRemoved>2019-09-20T19:00:00Z</geo:dateRemoved>
        <geo:temperatureStabilization xsi:nil="true"/>
      </geo:GnssReceiver>
      <geo:dateInserted>2018-09-26T00:00:00Z</geo:dateInserted>
    </geo:gnssReceiver>
    <geo:gnssReceiver>
      <geo:GnssReceiver gml:id="gnss-receiver-3">
        <geo:manufacturerSerialNumber>3013929</geo:manufacturerSerialNumber>
        <geo:igsModelCode codeList="http://xml.gov.au/icsm/geodesyml/codelists/antenna-receiver-codelists.xml#GeodesyML_GNSSReceiverTypeCode" codeListValue="SEPT POLARX5TR" codeSpace="urn:xml-gov-au:icsm:egeodesy:0.5">SEPT POLARX5TR</geo:igsModelCode>
        <geo:satelliteSystem>GPS+GLO+GAL+BDS+QZSS</geo:satelliteSystem>
        <geo:firmwareVersion>0.0.0-181002</geo:firmwareVersion>
        <geo:elevationCutoffSetting>0</geo:elevationCutoffSetting>
        <geo:dateInstalled>2019-09-20T19:00:00Z</geo:dateInstalled>
        <geo:dateRemoved>2020-02-05T22:12:00Z</geo:dateRemoved>
        <geo:temperatureStabilization xsi:nil="true"/>
      </geo:GnssReceiver>
      <geo:dateInserted>2019-09-20T00:00:00Z</geo:dateInserted>
    </geo:gnssReceiver>
    <geo:gnssReceiver>
      <geo:GnssReceiver gml:id="gnss-receiver-4">
        <geo:manufacturerSerialNumber>3013929</geo:manufacturerSerialNumber>
        <geo:igsModelCode codeList="http://xml.gov.au/icsm/geodesyml/codelists/antenna-receiver-codelists.xml#GeodesyML_GNSSReceiverTypeCode" codeListValue="SEPT POLARX5TR" codeSpace="urn:xml-gov-au:icsm:egeodesy:0.5">SEPT POLARX5TR</geo:igsModelCode>
        <geo:satelliteSystem>GPS+GLO+GAL+BDS+QZSS</geo:satelliteSystem>
        <geo:firmwareVersion>5.3.2</geo:firmwareVersion>
        <geo:elevationCutoffSetting>0</geo:elevationCutoffSetting>
        <geo:dateInstalled>2020-02-05T22:12:00Z</geo:dateInstalled>
        <geo:dateRemoved>2021-04-12T17:15:00Z</geo:dateRemoved>
        <geo:temperatureStabilization xsi:nil="true"/>
      </geo:GnssReceiver>
      <geo:dateInserted>2020-02-05T00:00:00Z</geo:dateInserted>
    </geo:gnssReceiver>
    <geo:gnssReceiver>
      <geo:GnssReceiver gml:id="gnss-receiver-5">
        <geo:manufacturerSerialNumber>3013929</geo:manufacturerSerialNumber>
        <geo:igsModelCode codeList="http://xml.gov.au/icsm/geodesyml/codelists/antenna-receiver-codelists.xml#GeodesyML_GNSSReceiverTypeCode" codeListValue="SEPT POLARX5TR" codeSpace="urn:xml-gov-au:icsm:egeodesy:0.5">SEPT POLARX5TR</geo:igsModelCode>
        <geo:satelliteSystem>GPS+GLO+GAL+BDS</geo:satelliteSystem>
        <geo:firmwareVersion>5.4.0</geo:firmwareVersion>
        <geo:elevationCutoffSetting>0</geo:elevationCutoffSetting>
        <geo:dateInstalled>2021-04-12T17:15:00Z</geo:dateInstalled>
        <geo:dateRemoved>2023-03-16T19:24:00Z</geo:dateRemoved>
        <geo:temperatureStabilization xsi:nil="true"/>
      </geo:GnssReceiver>
      <geo:dateInserted>2021-04-12T00:00:00Z</geo:dateInserted>
    </geo:gnssReceiver>
    <geo:gnssReceiver>
      <geo:GnssReceiver gml:id="gnss-receiver-6">
        <geo:manufacturerSerialNumber>3013929</geo:manufacturerSerialNumber>
        <geo:igsModelCode codeList="http://xml.gov.au/icsm/geodesyml/codelists/antenna-receiver-codelists.xml#GeodesyML_GNSSReceiverTypeCode" codeListValue="SEPT POLARX5TR" codeSpace="urn:xml-gov-au:icsm:egeodesy:0.5">SEPT POLARX5TR</geo:igsModelCode>
        <geo:satelliteSystem>GPS+GLO+GAL+BDS</geo:satelliteSystem>
        <geo:firmwareVersion>5.5.0</geo:firmwareVersion>
        <geo:elevationCutoffSetting>0</geo:elevationCutoffSetting>
        <geo:dateInstalled>2023-03-16T19:24:00Z</geo:dateInstalled>
        <geo:dateRemoved>2025-08-28T14:53:00Z</geo:dateRemoved>
        <geo:temperatureStabilization xsi:nil="true"/>
      </geo:GnssReceiver>
      <geo:dateInserted>2023-03-16T00:00:00Z</geo:dateInserted>
    </geo:gnssReceiver>
    <geo:gnssReceiver>
      <geo:GnssReceiver gml:id="gnss-receiver-7">
        <geo:manufacturerSerialNumber>3013929</geo:manufacturerSerialNumber>
        <geo:igsModelCode codeList="http://xml.gov.au/icsm/geodesyml/codelists/antenna-receiver-codelists.xml#GeodesyML_GNSSReceiverTypeCode" codeListValue="SEPT POLARX5TR" codeSpace="urn:xml-gov-au:icsm:egeodesy:0.5">SEPT POLARX5TR</geo:igsModelCode>
        <geo:satelliteSystem>GPS+GLO+GAL+BDS</geo:satelliteSystem>
        <geo:firmwareVersion>5.6.0</geo:firmwareVersion>
        <geo:elevationCutoffSetting>0</geo:elevationCutoffSetting>
        <geo:dateInstalled>2025-08-28T14:53:00Z</geo:dateInstalled>
        <geo:dateRemoved/>
        <geo:temperatureStabilization xsi:nil="true"/>
      </geo:GnssReceiver>
      <geo:dateInserted>2025-08-28T16:34:39Z</geo:dateInserted>
    </geo:gnssReceiver>
    <geo:gnssAntenna>
      <geo:GnssAntenna gml:id="gnss-antenna-1">
        <geo:manufacturerSerialNumber>1364-10065</geo:manufacturerSerialNumber>
        <geo:igsModelCode codeList="http://xml.gov.au/icsm/geodesyml/codelists/antenna-receiver-codelists.xml#GeodesyML_GNSSAntennaTypeCode" codeListValue="TPSCR.G5C NONE" codeSpace="urn:xml-gov-au:icsm:egeodesy:0.5">TPSCR.G5C       NONE</geo:igsModelCode>
        <geo:antennaReferencePoint codeSpace="urn:ga-gov-au:antenna-reference-point-type">BPA</geo:antennaReferencePoint>
        <geo:marker-arpUpEcc.>0.0000</geo:marker-arpUpEcc.>
        <geo:marker-arpNorthEcc.>0.0000</geo:marker-arpNorthEcc.>
        <geo:marker-arpEastEcc.>0.0000</geo:marker-arpEastEcc.>
        <geo:alignmentFromTrueNorth>0</geo:alignmentFromTrueNorth>
        <geo:antennaRadomeType codeSpace="urn:igs-org:gnss-radome-model-code">NONE</geo:antennaRadomeType>
        <geo:radomeSerialNumber/>
        <geo:antennaCableType/>
        <geo:antennaCableLength xsi:nil="true"/>
        <geo:dateInstalled>2018-06-20T00:00:00Z</geo:dateInstalled>
        <geo:dateRemoved/>
      </geo:GnssAntenna>
      <geo:dateInserted>2018-06-20T00:00:00Z</geo:dateInserted>
    </geo:gnssAntenna>
    <geo:frequencyStandard>
      <geo:FrequencyStandard gml:id="frequency-standard-1">
        <geo:standardType codeSpace="urn:ga-gov-au:frequency-standard-type">EXTERNAL H-MASER</geo:standardType>
        <geo:inputFrequency>5.0</geo:inputFrequency>
        <gml:validTime>
          <gml:TimePeriod gml:id="frequency-standard-1-time-period-1">
            <gml:beginPosition>1998-03-24</gml:beginPosition>
            <gml:endPosition/>
          </gml:TimePeriod>
        </gml:validTime>
        <geo:notes>reference signal from USNO Alternate Master
Clock #1, the back-up realization of UTC(USNO)
via two-way satellite time transfer;
All calibration delays will be
accounted for in the RAW pseudorange data
produced by AMC2.</geo:notes>
      </geo:FrequencyStandard>
      <geo:dateInserted>1998-03-24T00:00:00Z</geo:dateInserted>
    </geo:frequencyStandard>
    <geo:localEpisodicEffect>
      <geo:LocalEpisodicEffect gml:id="local-episodic-effect-1">
        <gml:validTime>
          <gml:TimePeriod gml:id="local-episodic-effect-1-time-period-1">
            <gml:beginPosition>2018-11-28</gml:beginPosition>
            <gml:endPosition/>
          </gml:TimePeriod>
        </gml:validTime>
        <geo:event>While we are evaluating the absolute calibration
values please note AMC4 data starting from
2018-11-28 has no calibration being applied to
RINEX data.
When new calibration values become available
RINEX data will be reprocessed and resubmitted.</geo:event>
      </geo:LocalEpisodicEffect>
      <geo:dateInserted>2018-11-28T00:00:00Z</geo:dateInserted>
    </geo:localEpisodicEffect>
    <geo:siteContact gml:id="site-contact-2">
      <gmd:CI_ResponsibleParty>
        <gmd:individualName>
          <gco:CharacterString>USNO GNSS group</gco:CharacterString>
        </gmd:individualName>
        <gmd:organisationName>
          <gco:CharacterString>U.S. Naval Observatory, Alternate Master Clock</gco:CharacterString>
        </gmd:organisationName>
        <gmd:contactInfo>
          <gmd:CI_Contact>
            <gmd:phone>
              <gmd:CI_Telephone>
                <gmd:voice>
                  <gco:CharacterString>+1 (202) 762-1455</gco:CharacterString>
                </gmd:voice>
                <gmd:voice>
                  <gco:CharacterString>+1 (202) 762-0740</gco:CharacterString>
                </gmd:voice>
              </gmd:CI_Telephone>
            </gmd:phone>
            <gmd:address>
              <gmd:CI_Address>
                <gmd:deliveryPoint>
                  <gco:CharacterString>USNO/AMC
400 O'Malley Ave, Suite 44
Schriever AFB, CO 80912-4044</gco:CharacterString>
                </gmd:deliveryPoint>
                <gmd:electronicMailAddress>
                  <gco:CharacterString>gnss@us.navy.mil</gco:CharacterString>
                </gmd:electronicMailAddress>
              </gmd:CI_Address>
            </gmd:address>
          </gmd:CI_Contact>
        </gmd:contactInfo>
        <gmd:role>
          <gmd:CI_RoleCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="pointOfContact"/>
        </gmd:role>
      </gmd:CI_ResponsibleParty>
    </geo:siteContact>
    <geo:siteMetadataCustodian gml:id="site-metadata-custodian">
      <gmd:CI_ResponsibleParty>
        <gmd:individualName>
          <gco:CharacterString>Jim Skinner</gco:CharacterString>
        </gmd:individualName>
        <gmd:organisationName>
          <gco:CharacterString>U.S. Naval Observatory, Alternate Master Clock</gco:CharacterString>
        </gmd:organisationName>
        <gmd:contactInfo>
          <gmd:CI_Contact>
            <gmd:phone>
              <gmd:CI_Telephone>
                <gmd:voice>
                  <gco:CharacterString>719-567-6389</gco:CharacterString>
                </gmd:voice>
                <gmd:facsimile>
                  <gco:CharacterString>719-567-3091</gco:CharacterString>
                </gmd:facsimile>
              </gmd:CI_Telephone>
            </gmd:phone>
            <gmd:address>
              <gmd:CI_Address>
                <gmd:deliveryPoint>
                  <gco:CharacterString>USNO/AMC
400 O'Malley Ave, Suite 44
Schriever AFB, CO 80912-4044</gco:CharacterString>
                </gmd:deliveryPoint>
                <gmd:electronicMailAddress>
                  <gco:CharacterString>james.skinner.4@spaceforce.mil</gco:CharacterString>
                </gmd:electronicMailAddress>
              </gmd:CI_Address>
            </gmd:address>
          </gmd:CI_Contact>
        </gmd:contactInfo>
        <gmd:role>
          <gmd:CI_RoleCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="pointOfContact"/>
        </gmd:role>
      </gmd:CI_ResponsibleParty>
    </geo:siteMetadataCustodian>
    <geo:moreInformation>
      <geo:MoreInformation gml:id="more-information">
        <geo:dataCenter>JPL</geo:dataCenter>
        <geo:dataCenter>CDDIS</geo:dataCenter>
        <geo:urlForMoreInformation/>
        <geo:siteMap>N</geo:siteMap>
        <geo:siteDiagram>N</geo:siteDiagram>
        <geo:horizonMask>N</geo:horizonMask>
        <geo:monumentDescription>no monument</geo:monumentDescription>
        <geo:sitePictures>N</geo:sitePictures>
        <geo:antennaGraphicsWithDimensions/>
        <geo:insertTextGraphicFromAntenna>

     (insert text graphic from file antenna.gra)


    </geo:insertTextGraphicFromAntenna>
        <geo:DOI codeSpace="urn:ga-gov-au:self.moreInformation-type">TODO</geo:DOI>
      </geo:MoreInformation>
    </geo:moreInformation>
  </geo:siteLog>
</geo:GeodesyML>