Identification

Title

Central Pacific VLF Signal Survey and Omega Wind Error Predictions

Abstract

The report on the Central Pacific VLF Signal Survey and Omega Wind Error Predictions is a preliminary document based on the theoretical predictions of Omega signal strengths and VLF noise level in the equatorial regions. Only limited empirical verification is included, essentially at Majuro in the Marshall Islands. The First GARP Global Experiment in 1979 will include two tropical wind-finding systems which use Omega navigation signals to determine the relative positions of a radiosonde as a function of time, and hence winds. Complete coverage of the deep tropics with Omega signals is not possible in 1979, since the Australian Omega station will not yet be completed. The wind accuracies are computed for a 13.6 kHz Omega signal between 30ï¿½ï¿½N and 30ï¿½ï¿½S latitudes for local noon and local midnight conditions in January. The effect of Australia is clearly illustrated. The results are compared with data measured at Majuro Atoll in the Marshall Islands. It is shown that observations near local noon provide the greatest accuracy. The FGGE requirement for 2 m/sec accuracy will be met in substantial areas of the tropical Pacific and Atlantic Oceans at local noon. The Indian Ocean region will suffer large errors south of the equator without Australia. At local midnight, when stations with potential model interference are not used in the wind computation, the regions of acceptable wind errors are decreased. The accuracy of the wind error predictions is now being evaluated from experimental data recently made available from the Indian Ocean region. These data will be used to improve the theoretical model and confirm whether or not the processors used in these experiments were operating near theoretical performance levels. Therefore, the results presented in this document should be used with some reservations. As a preliminary guide it can be said that the Indian Ocean data suggest that the analytical wind error model is more representative of the real world than the Majuro data-fitted model.

Resource type

document

Resource locator

Unique resource identifier

code

http://n2t.net/ark:/85065/d71n80hr

codeSpace

Dataset language

eng

Spatial reference system

code identifying the spatial reference system

Classification of spatial data and services

Topic category

geoscientificInformation

Keywords

Keyword set

keyword value

Text

originating controlled vocabulary

title

Resource Type

reference date

date type

publication

effective date

2016-01-01T00:00:00Z

Keyword set

keyword value

EARTH SCIENCE > SPECTRAL/ENGINEERING > SENSOR CHARACTERISTICS

EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC WINDS > UPPER LEVEL WINDS

originating controlled vocabulary

title

U.S. National Aeronautics and Space Administration Global Change Master Directory

reference date

date type

revision

effective date

2021-09-17

Geographic location

West bounding longitude

East bounding longitude

North bounding latitude

South bounding latitude

Temporal reference

Temporal extent

Begin position

End position

Dataset reference date

date type

publication

effective date

1977-01-01T00:00:00Z

Frequency of update

Quality and validity

Lineage

Conformity

Data format

name of format

version of format

Constraints related to access and use

Constraint set

Use constraints

Limitations on public access

None

Responsible organisations

Responsible party

contact position

OpenSky Support

organisation name

UCAR/NCAR - Library

full postal address

PO Box 3000

Boulder

80307-3000

email address

opensky@ucar.edu

web address

http://opensky.ucar.edu/

name: homepage

responsible party role

pointOfContact

Metadata on metadata

Metadata point of contact

contact position

OpenSky Support

organisation name

UCAR/NCAR - Library

full postal address

PO Box 3000

Boulder

80307-3000

email address

opensky@ucar.edu

web address

http://opensky.ucar.edu/

name: homepage

responsible party role

pointOfContact

Metadata date

2023-08-18T18:03:45.087509

Metadata language

eng; USA