The microwave transmitting module for doppler navigator equipment (DISD — FG) of “Phobos — Grunt” program

The results of the development of the transmitting module M45224 of Doppler speed and range measuring device (DISD) are presented. This module is designed to work in the ASC “Phobos-Grunt” movement measuring lander during the final approach and landing segments. M45224 Transmitter Module is designed by FSUC “Istok” for Doppler velocity and range measuring device (DISD). It consists of two identical solid-state microwave generators (main and backup) with a frequency modulation and microwave radio frequency unit, which includes a switch for five outputs-channels (signals from four channels are received at the antenna, while the fifth one is a control channel, and a signal from this channel is given to the receiving module), a power combiner and a directional power coupler for the heterodyne signal receiver formation. The module is intended to work in ASC “Phobos-Grunt” spacecraft for the lender movement measuring on segments of the final approach and landing on Phobos.