Summary

Data Downlink Subsystems in X-Band have considerable heritage in numerous Earth Observation programs conducted for more than 20 years. Based on this long experience, Tesat is developing an Integrated Downlink Transmitter (IDT) solution.

The solution being developed by Tesat offers the following advantages:

  • Maximized data throughput
  • Minimized latency of data
  • Reduced Ground Station contacts
  • High spectrum efficiency and high transmit power efficiency
  • Improved link budget due to strong SCCC encoding
  • Digital predistortion for linearization of Power Amplifier
  • Reliable end-to-end solution (verified with state-of-the-art receivers)
  • Key technology is Adaptive Coding & Modulation (ACM) allowing the volume of data to adapt to link budget characteristics

The key characteristics of Tesat's IDT include:

  • Compact and lightweight High Data Rate Downlink Transmitter for Earth Observation Satellites
  • Cost attractive design based on class 3 components
  • Features X-Band with GaN SSPA (20 W RF Output Power)
  • High order modulation scheme up to 64-APSK combined with powerful SCCC error correction coding enables reliable communication
  • Up to 1,300 Mbps per channel
  • Data input interface with state-of-the-art WizardLink incl. Flow Control or Space Fibre
  • Technology verified by end-to-end measurements incl. state-of-the-art Ground Station High Data Rate Demodulator

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Last updated: 2021-03-14

Integrated Data Downlink Transmitter (IDT)

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Specs

mass (without panel, without DC harness)
2.5 kg
length
170 mm
width
80 mm
height
100 mm
DC power consumption1
< 75 W
rf output power2
< 20 W
power bus3
21 to 38 V
lifetime
7 yr
data rate4
160 to 1300 Mb/s
bandwidth5
325 MHz
radio signal frequency range
X-Band (8,025 - 8,400 MHz)

1. at 20W RF output power

2. depending on back-off

3. others possible

4. ACM modes 1 - 27

5. roll-Off = 0.3

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