Airbus Defence and Space

EARTH OBSERVATION, NAVIGATION AND SCIENCE

Travelling wavetube amplifier (TWTA) for KU band

The pulsed mode operated TWTA is used in space-based Scatterometer Systems for Remote Sensing. This Electronic Power Conditioner (EPC) has been designed and qualified for the Ocean Vector Wind Instrument used in the NASA (JPL) Remote Sensing satellite program.

The key technology in this EPC is the reliable packaging of high voltage / high power-circuitry and transformers for the 6.5 kV supply voltages of the TWT.

Features / technical details

DC bus (unregulated): 24 – 32 V

Cathode Voltage: 6300 V, 4 mA

Cathode Voltage Tolerance (in pulse): ±2 V

Collector Voltages (4 collectors): 3400 / 2900 / 1200 / 800 V

Collector Voltage Tolerance: ±18 … 44 V

Anode Voltage: 5200 V

Grid Voltage Steps: 79/81/83/85 V

Pulse Length: 2 ms

PRF: 100 … 200 Hz

Duty Cycle: 40 %

Peak Output Power to TWT: 236 W

DC Input Power: 120 W

Efficiency: 78 %

Applications

Scatterometer Instruments for space based Remote Sensing missions

Reference customers

Qualification Model delivered to NASA (JPL) in 2005 ; Flight models delivered to ISRO (Indian Space Research Organisation) for their OCEANSAT Scatterometer Program in 2006.