  The requirements for an optimal sequence for SuperDARN radar are stated.
Obtained quasioptimal signals up to 26-pulse sequence are based on optimal and
nearly optimal Golomb rulers. It is shown that standard 7-pulse SuperDARN
sequence is one of the quasioptimal sounding signals, but 8-pulse kascan
SuperDARN signal is not. The characteristics are calculated for quasioptimal
sounding sequences up to 26-pulse one. It is shown that the most effective
signals for the spectral measurements are 10, 12, 14, 18, 20, 24 and 26 pulse
sequences.
  We present the results of the first spectral measurements at the EKB
SuperDARN radar with quasioptimal 8- and 9-pulse sequences, as well as with the
optimal 10-and 12-pulse sequences. A comparison with the results obtained with
standard 7-pulse SuperDARN sequence were made. The continuity of results in
amplitude and velocity is shown, the expected improvement in the spectral width
are also demonstrated.
