The EISCAT meteor code
2008 (English)In: Annales Geophysicae, ISSN 0992-7689, Vol. 26, 2303-2309 p.Article in journal (Refereed) Published
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 2.4μs and the receiver bandwidth is 1.6MHz to accommodate both the resulting modulation bandwidth and the target Doppler shift. Sampling is at 0.6μs, 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 <300m as long as their Doppler shifts differ by more than a few km/s.
Place, publisher, year, edition, pages
2008. Vol. 26, 2303-2309 p.
Electromagnetics, Plasmas, Signal processing and adaptive antennas, Ionosphere, Instruments and techniques
Fusion, Plasma and Space Physics
IdentifiersURN: urn:nbn:se:umu:diva-11235OAI: oai:DiVA.org:umu-11235DiVA: diva2:150906