The repeated measurements were in a time frame of weeks. The OU (Figure In pack ice, the situation can change quickly when the wind shifts.

• In October and November 2009, high-resolution TerraSAR-X data were acquired in Antarctica in the left-looking observation mode. The power consumption is in the range of 15 W, depending on processor load.

Note: TOPSAR is an ESA-proposed acquisition mode for wide swath imaging which aims at reducing the drawbacks of the ScanSAR mode. The internal calibration facility of TSX-SAR monitors the critical elements of the For each receiver an independent passive GPS antenna (Seavey SPA-16C/S) and low noise amplifier (Delta Microwave L5690) are employed, which enable representative signal-to-noise ratios (C/N0) of 45 dB-Hz near the boresight direction. about 20 times longer than this; thus, the sensitivity of TSX-SAR to small current variations will be quite low.

The IGOR derived orbit fits better than 4 cm with laser ranging residuals. The duration and intensity of this icy period are important indicators for climate research. The science potential of the mission is given by: All systems are functioning nominally.

The technique aims at achieving the same coverage and resolution as ScanSAR, but with a nearly uniform SNR (Signal-to-Noise Ratio) and DTAR (Distributed Target Ambiguity Ratio). The ground swath is illuminated with a continuous sequence of pulses while the antenna beam is fixed in elevation and azimuth.

- Dual polarization: In this mode the radar toggles the transmit and/or receive polarization on a pulse to pulse basis. TerraSAR-X carries an X-band, steerable, SAR radar with single and dual polarisation options. Additional direct payload access stations - commercial partners of Infoterra - are foreseen to extend the baseline receiving station concept. This feature makes it possible to activate both functional chains at the same time, one being the master for timing purposes, thus permitting operations in an experimental With its own unchanged mission targets still in focus, TerraSAR-X has been meeting all expectations here as well (Ref. Operating the two virtually identical satellites as a constellation will enhance a wide range of time-critical and data-intensive applications through shorter revisit times and increased data acquisition capacities. Precise orbit determination is performed with a dual-frequency GPS receiver and raw data post processing on ground, permitting for orbit restitution accuracies in the cm range. There the received beam is superposed with a local oscillator laser in order to extract maximum sensitivity for a given received power level. At average latitudes an interferometric pair can be acquired within only 12 days. The TOPSAR technique will be used by the ESA Sentinel-1 C-SAR sensor. - Spacecraft and ground segment are fully operational

The spotlight mode is realized on a “sliding spotlight operation” concept. - Internal calibration: The compensation of instrument fluctuations. - SLR measurements tracking the TerraSAR-X spacecraft are being regularly performed by the global SLR community. Lists of daily occultation events including additional information as e.g.

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