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Fig. 2 | Progress in Earth and Planetary Science

Fig. 2

From: MF and HF radar techniques for investigating the dynamics and structure of the 50 to 110 km height region: a review

Fig. 2

A typical antenna layout for the spaced antenna technique at 2.43 MHz. This arrangement is for the Poker Flat MF radar (see Kawamura et al. 2007). All antennas are used for both transmission and reception using circular polarization. This optimizes system sensitivity, as transmitter and receiver polar diagrams are matched. The antenna orientation is designed to reduce coupling, and the overall arrangement facilitates the use of the FCA, FSA, SCA, IDI, and meteor analyses. Generally, the antenna spacing is selected so that cross-correlation functions calculated between antennas on the long sides of the triangle takes peak values of about 0.5. Because the fading times vary with height (see Fig. 8), the outer triangle spacing is generally optimized for a particular height. Having an additional antenna at the center of the triangle provides the potential for better cross-correlation values (~0.5) over a greater range of heights

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