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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 26, issue 8
Ann. Geophys., 26, 2303-2309, 2008
https://doi.org/10.5194/angeo-26-2303-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: 13th International EISCAT Workshop

Ann. Geophys., 26, 2303-2309, 2008
https://doi.org/10.5194/angeo-26-2303-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.

  05 Aug 2008

05 Aug 2008

The EISCAT meteor code

G. Wannberg1, A. Westman2, J. Kero1, C. Szasz1, and A. Pellinen-Wannberg3 G. Wannberg et al.
  • 1Swedish Institute of Space Physics, P.O. Box 812, 981 28 Kiruna, Sweden
  • 2EISCAT Scientific Association, P.O. Box 812, 981 28 Kiruna, Sweden
  • 3Umeå University and Swedish Institute of Space Physics, P.O. Box 812, 981 28 Kiruna, Sweden

Abstract. The EISCAT UHF system has the unique capability to determine meteor vector velocities from the head echo Doppler shifts measured at the three sites. Since even meteors spending a very short time in the common volume produce analysable events, the technique lends itself ideally to mapping the orbits of meteors arriving from arbitrary directions over most of the upper hemisphere.

A radar mode optimised for this application was developed in 2001/2002. A specially selected low-sidelobe 32-bit pseudo-random binary sequence is used to binary phase shift key (BPSK) the transmitted carrier. The baud-length is 2.4 μs and the receiver bandwidth is 1.6 MHz to accommodate both the resulting modulation bandwidth and the target Doppler shift. Sampling is at 0.6 μs, corresponding to 90-m range resolution. Target range and Doppler velocity are extracted from the raw data in a multi-step matched-filter procedure. For strong (SNR>5) events the Doppler velocity standard deviation is 100–150 m/s. The effective range resolution is about 30 m, allowing very accurate time-of-flight velocity estimates. On average, Doppler and time-of-flight (TOF) velocities agree to within about one part in 103. Two or more targets simultaneously present in the beam can be resolved down to a range separation <300 m as long as their Doppler shifts differ by more than a few km/s.

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