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Title: Calibration and evaluation of Blackbeard time tagging capability

Abstract

During November and December of 1996, the Los Alamos Portable Pulser (LAPP) facility was used to evaluate the accuracy of time tags produced by the Blackbeard instrument, a payload on the ALEXIS (Array of Low Energy X-ray Imaging Sensors) satellite. Over a two-month period, LAPP transmitted 65 broadband electromagnetic pulses to Blackbeard during satellite passes over North America. Of the 65 pulses transmitted, 31 were successfully received by Blackbeard. Ground-based diagnostics and a timing system disciplined by GPS allowed precise determinations of LAPP firing times to be made. Knowledge of the range to ALEXIS for each of the pulser shots allowed them to determine pulse propagation delays. The firing times were used in conjunction with propagation delays to compute estimated times of arrival (ETOAs) for pulses reaching Blackbeard. ETOAs were compared to Blackbeard reported times of arrival (RTOAs), which were computed from information returned by Blackbeard using an algorithm presented in this paper. For the 31 pulser shots received by Blackbeard, the mean difference between ETOA and RTOA was 1.97 milliseconds, with RTOAs occurring later than ETOAs. The standard deviation of the difference was 0.43 milliseconds. As a result of the study, the algorithm used for accurate Blackbeard time tatmore » studies has been modified to subtract 1.97 milliseconds from reported times of arrival. The 0.43 ms error standard deviation is now used to describe the uncertainty of Blackbeard time tags.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Los Alamos National Lab., NM (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
555547
Report Number(s):
LA-UR-97-3184; CONF-970991-
ON: DE98001327; TRN: AHC29802%%131
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: 11. annual AIAA conference on small satellites, Logan, UT (United States), 15-18 Sep 1997; Other Information: PBD: [1997]
Country of Publication:
United States
Language:
English
Subject:
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE; SATELLITES; TIMING PROPERTIES; MEASURING INSTRUMENTS; X RADIATION; DIGITIZERS; RADIO NOISE; LIGHTNING; STORMS; TRIGGER CIRCUITS; TIME MEASUREMENT; IONOSPHERE

Citation Formats

Smith, D A, DeLapp, D M, Holden, D N, Stelzer, G L, and Klingner, P L. Calibration and evaluation of Blackbeard time tagging capability. United States: N. p., 1997. Web.
Smith, D A, DeLapp, D M, Holden, D N, Stelzer, G L, & Klingner, P L. Calibration and evaluation of Blackbeard time tagging capability. United States.
Smith, D A, DeLapp, D M, Holden, D N, Stelzer, G L, and Klingner, P L. Mon . "Calibration and evaluation of Blackbeard time tagging capability". United States. https://www.osti.gov/servlets/purl/555547.
@article{osti_555547,
title = {Calibration and evaluation of Blackbeard time tagging capability},
author = {Smith, D A and DeLapp, D M and Holden, D N and Stelzer, G L and Klingner, P L},
abstractNote = {During November and December of 1996, the Los Alamos Portable Pulser (LAPP) facility was used to evaluate the accuracy of time tags produced by the Blackbeard instrument, a payload on the ALEXIS (Array of Low Energy X-ray Imaging Sensors) satellite. Over a two-month period, LAPP transmitted 65 broadband electromagnetic pulses to Blackbeard during satellite passes over North America. Of the 65 pulses transmitted, 31 were successfully received by Blackbeard. Ground-based diagnostics and a timing system disciplined by GPS allowed precise determinations of LAPP firing times to be made. Knowledge of the range to ALEXIS for each of the pulser shots allowed them to determine pulse propagation delays. The firing times were used in conjunction with propagation delays to compute estimated times of arrival (ETOAs) for pulses reaching Blackbeard. ETOAs were compared to Blackbeard reported times of arrival (RTOAs), which were computed from information returned by Blackbeard using an algorithm presented in this paper. For the 31 pulser shots received by Blackbeard, the mean difference between ETOA and RTOA was 1.97 milliseconds, with RTOAs occurring later than ETOAs. The standard deviation of the difference was 0.43 milliseconds. As a result of the study, the algorithm used for accurate Blackbeard time tat studies has been modified to subtract 1.97 milliseconds from reported times of arrival. The 0.43 ms error standard deviation is now used to describe the uncertainty of Blackbeard time tags.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1997},
month = {12}
}

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