SGF Herstmonceux GNSS team (gnss@sgf.rgo.ac.uk) 2025-03-25 UPDATE Herstmonceux HERS 0 0 13212M007 7840 8 CONCRETE BLOCK 5 1991-09-01 Hailsham East Sussex SNR-8A receiver from 1991-09-01 to 1992-03-24 FV from 1993-02-01 CR325 5.0 2.0 1992-03-24 Temporary installation pending purchase of permanent (Ashtech) receiver (see sect 3.3) LP01573 4.0 2.0 1998-02-18T00:00:00Z Permanent receiver - model 700845-10(G) LP03373 4.0 2.0 1998-07-01T00:00:00Z Firmware upgrade for GPS week rollover LP03373 4.0 2.0 1999-08-20T01:37:00Z Septentrio receiver takes a 10Mhz and 1pps input from H-Maser. Receiver is located in the same temp controlled room as the maser. 2001062 0.0 1.0 2010-08-19T12:00:00Z Firmware update to 2.1 2001062 0.0 1.0 2018-08-22T09:16:00Z 3025419 0.0 1.0 2020-02-20T11:48:00Z firmware upgrade 3025419 0.0 1.0 2021-02-08T13:55:00Z firmware upgrade 3025419 0.0 1.0 2025-03-25T10:43:00Z firmware upgrade 3025419 0.0 1.0 2025-03-25T10:43:00Z 102 0.2 0.0 0.0 0.0 1991-09-01 CR14108 0.0096 0.0 0.0 0.0 30.0 1998-02-18T00:00:00Z The antenna (reference position unchanged from above) is mounted at the top of an 8-meter, open lattice, cross-braced steel mast set in a concrete base. The plane of the chokering is above local trees and buildings. Antenna unchanged. On 18-Aug-2000 ~10:30UT a second nearby GPS antenna (1m away from and below the HERS chokering) mounted on the same mast was removed and relocated elsewhere on site Antenna removed because of non-uniform directional response and sent to Ashtech for repair (IGSMAIL 3373) CR16688 0.0096 0.0 0.0 0.0 30.0 1998-07-01T00:00:00Z Antenna unchanged. Repaired antenna (4.4) remounted on monument. Data resubmission restarted 03-Sep-2001 (IGSMAIL 3503) CR16688 0.0096 0.0 0.0 0.0 30.0 2001-08-08T15:00:00Z 10250002 0.0096 0.0 0.0 0.0 30.0 2010-08-19T12:00:00Z -6.4992 -10.2707 3.9401 2.0 2008-06-23 -9.1855 -135.0916 16.9475 2.0 2008-06-23 5.0 1996-06-17 10.0 2010-08-19 2017-03-13 10.0 2021-05-26T11:20:00Z 2022-02-03T10:13:00Z 10.0 2022-02-03T10:13:00Z 1984-09-01 1999-12-01 1.1 300.0 5.0 1996-06-19 1.1 300.0 1.5 2002-01-18 1.1 300.0 0.1 1997-06-04 1.1 300.0 0.1 1997-06-04 1.1 300.0 0.3 2002-01-18 ARP: Antenna Reference Point L1 : L1 Phase Center L2 : L2 Phase Center TCR: Top of Chokering BCR: Bottom of Chokering -------------------------------------------------------------------------- ASHTECH: ASH700936E ----- / + <-- 0.128 L2 | + | <-- 0.110 L1 +-----------------+-------------+------------------+ <-- 0.102 TCR | | | | | | | | +-+-----------------+-------------+------------------+-+ <-- 0.038 +-------------------+-------------+--------------------+ <-- 0.035 BCR | | =| | +------x------+ <-- -0.000 ARP=BPA <-- 0.381 --> ARP: Antenna Reference Point BPA: Bottom of Pre-Amplifier L1 : L1 Phase Center L2 : L2 Phase Center TCR: Top of Chokering BCR: Bottom of Chokering -------------------------------------------------------------------------- LEIAR25.R3 +-------+ <-- 0.1995 / +---+-------------+---+ <-- 0.1606 TCR | | |---------------------------| |---------------------------------| |---------------------------------------| +---------------------------------------------+ | | | | +-+---------------------------------------------+-+ +-----------------+-------------+-----------------+ <-- 0.0320 BCR | | | | +------x------+ <-- 0.0000 BPA=ARP]]> ARP: Antenna Reference Point L1 : L1 Phase Center L2 : L2 Phase Center TCR: Top of Chokering BCR: Bottom of Chokering -------------------------------------------------------------------------- ASHTECH: ASH700936E ----- / + <-- 0.128 L2 | + | <-- 0.110 L1 +-----------------+-------------+------------------+ <-- 0.102 TCR | | | | | | | | +-+-----------------+-------------+------------------+-+ <-- 0.038 +-------------------+-------------+--------------------+ <-- 0.035 BCR | | =| | +------x------+ <-- -0.000 ARP=BPA <-- 0.381 --> ARP: Antenna Reference Point BPA: Bottom of Pre-Amplifier L1 : L1 Phase Center L2 : L2 Phase Center TCR: Top of Chokering BCR: Bottom of Chokering -------------------------------------------------------------------------- LEIAR25.R3 +-------+ <-- 0.1995 / +---+-------------+---+ <-- 0.1606 TCR | | |---------------------------| |---------------------------------| |---------------------------------------| +---------------------------------------------+ | | | | +-+---------------------------------------------+-+ +-----------------+-------------+-----------------+ <-- 0.0320 BCR | | | | +------x------+ <-- 0.0000 BPA=ARP]]>