Stripmap

Stripmap (SM) mode acquires data with an 80 km swath at slightly better than 5 m by 5 m spatial resolution (single look). The ground swath is illuminated by a continuous sequence of pulses while the antenna beam is pointing to a fixed azimuth angle and an approximately fixed off-nadir angle (this is subject to small variations because of roll steering). SM images have continuous along track image quality at an approximately constant incidence angle.

Table 1: Main characteristics of Stripmap mode
Characteristic Value
Swath width 80 km
Incidence angle range 18.3° - 46.8°
Elevation beams 6
Polarisation options Dual HH+HV, VV+VH
Single HH, VV
Maximum Noise Equivalent Sigma Zero (NESZ) -22 dB

 

Stripmap imaging mode operates with one of six predefined elevation beams, each at a different incidence angle. Table 2 shows the incidence and off-nadir angles for Stripmap beams.

The incidence angle is the angle between the incident SAR beam and the axis perpendicular to the local geodetic ground surface.

The off-nadir angle is the look angle between the satellite's nadir position and the SAR beam.

Table 2: Angles for Stripmap mode beams
Beam S1 S2 S3 S4 S5 S6
Off-nadir angles at
min orbit altitude [°]
17.93-23.53 21.00-26.33 26.18-30.99 30.87-35.15 35.07-38.85 37.53-41.01
Incident angles at min
orbit altitude [°]
19.99-26.31 23.45-29.50 29.33-34.85 34.71-39.72 39.62-44.12 42.53-46.73
Off-nadir angles at
max orbit altitude [°]
16.45-21.96 19.51-24.77 24.67-29.45 29.34-33.63 33.53-37.34 35.98-39.51
Incident angles at max
orbit altitude [°]
18.32-24.55 21.78-27.76 27.64-33.13 33.00-38.02 37.89-42.43 40.79-45.04

 

Stripmap mode is used to image small islands and in exceptional cases only, to support emergency management actions.

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