(4) All the instruments on board the TGS as well as the Diagnostic Package will be turned on except for the high voltage power supply of the DFD. (5) The target satellite is released to a distance of 100 m from the SFU by springs and/or thrusters. Individual antenna elements of the MWT are checked by switching on the HPA. Next, the pilot signal transmitter is turned on, and the MWT starts to examine the retrodirective systems and computer systems used for phase control. After all the preparatory checkouts, the TGS is further released to a distance of 1 km. A TV camera will monitor the release. 2. Microwave Beam Control Test (towards TGS) The attitude of the SFU is oriented so as to keep the solar panels in direct sunlight, and the battery is charged to the maximum. In this section, three different modes will be possible for control of the transmitted microwaves: (1) using the retrodirective system; (2) computer control mode; and (3) mixed mode with both retrodirective and computer systems. The following parameters will be measured while increasing transmitting power: (a) scanning angle range of the transmitting antenna; (b) steering accuracy of the microwave beam control; (c) microwave beam transmission efficiency. A schematic view of the microwave beam control test towards the target satellite is shown in Fig. 15.
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