Minimize Extra Wide Swath

Similar to the IW mode, the Extra Wide swath mode employs the TOPSAR technique to acquire data over a much wider area using five sub-swaths. EW mode acquires data over a 400 km swath at 20 m by 40 m spatial resolution.

EW SLC products contain one image per sub-swath and one per polarisation channel, for a total of five (single polarisation) or 10 (dual polarisation) images in an EW product.

The EW mode is aimed primarily for use over sea-ice, polar zones and certain maritime areas, in particular for ice, oil spill monitoring and security services. Like IW, EW mode can also be used for interferometry since it shares the same characteristics for burst synchronisation, baseline and Doppler stability.

The table below shows the main characteristics of the Extra Wide swath mode.

Characteristic Value
Swath width 400 km
Incidence angle range 18.9° - 47.0°
Sub-swaths 5
Azmiuth steering angle ± 0.8°
Azmiuth and range looks Single
Polarisation options Dual HH+HV, VV+VH
Single HH, VV
Maximum Noise Equivalent Sigma Zero (NESZ) -22 dB
Radiometric stability 0.5 dB (3σ)
Radiometric accuracy 1 dB (3σ)
Phase error

Table 1: Characteristics of Extra Wide swath mode

The table below shows the incidence and off-nadir angles for Extra Wide swath mode beams.

Beam EW1 EW2 EW3 EW4 EW5
Off-nadir angles at
min orbit altitude
17.94-26.07 26.02-30.66 30.61-35.10 35.06-38.66 38.63-41.20
Incidence angles at
min orbit altitude
20.00-29.20 29.15-34.47 34.41-39.66 39.60-43.89 43.86-46.97
Off-nadir angles at
max orbit altitude
16.36-24.49 24.44-29.08 29.03-33.52 33.48-37.08 37.05-39.62
Incidence angles at
max orbit altitude
18.22-27.57 27.38-33.42 32.65-38.05 37.84-42.53 42.08-45.16

Table 2: Angles for Extra Wide swath mode beams