PAGE CONTENTS
Objectives
The main objective for the program was to develop and qualify the Second Generation Command Receiver. The starting point for the activity was the already established first generation Command Receiver. This was essentially a blueprint copy of the licensed product from Thales Alenia Space (TAS). To be able to provide improved functionality (frequency flexibility), improved performance and in general product and parts independence from TAS, the development of the 2nd Generation Command Receiver was initiated.
The main new feature of the second generation command receiver is the in orbit programmable receiving frequency. This opens for improved possibilities for solving interference issues during deployment and on-station operation. In particular this is an advantage for Electrical Orbit Raising. In addition, this opens for a more efficient satellite fleet management and more flexible use of satellites in new positions during their lifetime.
Challenges
A key issue for the development has been to be able to implement in-orbit frequency agility and at the same time improve the interferer immunity. The results from the analysis and tests show that the goal has been achieved and excellent performance is demonstrated. The frequency agility capability will allow the on-board computer to set any Ku-band input frequency within a 770 MHz band during in-orbit mission. For C-band the agile bandwidth is 400MHz.
Plan
The following development plan has been followed during the program:
PDR – Preliminary Design Review
This milestone concluded the initial work with the unit optimization and critical design
CDR– Critical Design Review
This milestone concluded the detailed design and development as well as the supporting performance and reliability analysis. This also gave the starting point for the manufacturing of the EQM
EQM TRB – Test Review Board / Final Review
After the completion of the EQM test campaign, the TRB was successfully held.
After completion of the program the activity was continued through a CCN. This included the formal qualification of a C-band Command Receiver with customer specific interface.
A delta CDR and TRB have been successfully held.
Current Status
The program is now completed with the qualification of the Command Receiver EQM both in Ku-band and C-band configuration.
