Specifications

tandem_animated_coverage_change

TanDEM-X Mapping Capability

Swath width: 30 km
Duty cycle: 3 min/ Orbit

Tandem-L Mapping Capability

Swath width: 350 km
Duty cycle: 30 min/ Orbit

Key parameters and performance figures for the Tandem-L satellites

Parameter Value Comments
Orbit height 745 km 231 cycles/16 days
Orbital tube 500 m (3σ) Refers to master satellite
Horizontal baselines 1 km ... 18 km Variable horizontal baselines for bistatic mode in close formation
Radial baselines 0 m ... 400 m Radial baselines are mainly for passive safety in close formation (Helix concept)
Local time 6 h/18 h Dawn/Dusk
Inclination 98.4° Sun synchronous orbit
Revisit time 16 days The 350 km wide swath mode enables up to 4 global data acquisitions from different viewing directions every 16 days
Frequency L-band Available band: 1215 ... 1300 MHz
Range bandwidth Up to 85 MHz Split frequency modes for ionospheric corrections (for reduced bandwidth modes)
Azimuth resolution 7 m For swath width up to 350 km - single/dual pol., for swath wide up to 175 km - quad pol
3 m For swath width up to 350 km - single/dual pol., for swath wide up to 175 km - quad pol.
1 m For 50 km wide swath (single/dual/quad pol.), swath access by mechanical steering of satellite
Downlink capacity Up to 8 terbytes/day Based on Ka-band downlink to a ground station network, extension with X-band and/or Laser Communication Terminal (LCT) to be investigated in phase-A
Look direction Right & left Nominal: right looking, left-looking by horizontal satellite rotation
Reflector diameter 15 m Deployable reflector with 10/15 m boom
Mission lifetime 10 years Resources available for at least 12 years
Polarization Single/dual/quad Optional use of hybrid and compact pol modes shall be investigated in conceptual design/phase-A study