Figure 11: SNR vs Range profiles on four different days for Quarter-wave molopole antenna (left plot) and QHA antenna (right plot).
Further one year of radiosonde flights over NARL for the year 2015 are examined to find the histogram of maximum radial distance of the flights. This exercise is carried out to know if the distance coverage of RTL-SDR receiver is sufficient for the proposed application. Figure 12 shows the histogram of the radiosonde distance for one year of flights. Total 339 numbers of radiosonde profiles are used for the analysis.