In order to diagnose and forecast the near Earth’s environment the four spacecraft JONOSOND missions lead by Russian Space Agency were proposed. The four identical spacecrafts will be located at the polar circular orbit at the altitude 600km and 800km. The four ionosonds LAERT, dedicated to top-side in situ active diagnostics, were designed in CBK PAN. Each instrument consists of two parts: transmitter and the receiver with preamplifier for antenna system.