Proceedings with Extended Abstracts (single PDF file) - Radio ...

Figure 3: (a) Mean horizontal wind speed and direction from September 2002 to December2002, obtained from NCEP/NCAR reanalysis dataset. (b) Mean vertical wind speed measuredby the radar (solid line) and the expected horizontal contamination (dashed line).the sidereal day was utilized. The results obtained show that the antenna array behaves almostexactly as expected.It was found that the most accurate method of finding the beam pointing direction and beamwidthwas the comparison of individual radio source patterns, as measured by the radar, withtheir expected patterns. It should be noted that excellent sky noise results were obtained whilethe radar was in normal operation, demonstrating the value of this technique, as it can be usedto continuously monitor the antenna beam pattern and also the system stability. The availabilityof both a 45 MHz sky map and high resolution data allowed for independent estimations of thesource locations. The difference in location was comparable to the uncertainty in the radar skynoise data, producing a limitation in accuracy of £ 0¢ 25 .ReferencesAlvarez, H., J. Aparici, J. May, and F. Olmos, A 45-MHz continuum survey of the southernhemisphere, Astron. Astrophys. Suppl. Ser., 124, 315–328, 1997.Campistron, B., G. Despaux, M. Lothon, V. Klaus, Y. Pointin, and M. Mauprivez, A partial 45MHz sky temperature map obtained from the observations of five ST radars, Ann. Geophys.,19, 863–871, 2001.Graf, W., R. N. Bracewell, J. H. Deuter, and J. S. Rutherford, The sun as a test source forboresight calibration of microwave antennas, I.E.E.E. Trans. Antennas. Prop., AP-19, 606–612, 1971.Hildebrand, P. H., and R. S. Sekhon, Objective determination of the noise level in dopplerspectra, J. Appl. Meteorol., 13, 808–811, 1974.Nastrom, G. D., and T. E. VanZandt, Mean vertical motions seen by radar wind profilers, J.Appl. Meteorol., 33, 984–995, 1994.Sato, T., Y. Inooka, S. Fukao, and S. Kato, Multi-beam pattern measurements of the MU radarantenna by satellite OHZORA, J. Geomag. Geoelectr., 41, 743–751, 1989.394