IEEE - Aerospace and Electronic Systems - November 2022 - 38

High Fidelity RF Clutter Modeling and Simulation
over the ocean with an iceberg, which is moving relative
to the background ocean. Similar to the example in
Figure 25, the image in this example was generated from
the basic range-doppler processing techniques and motion
compensation using the known platform locations. Table 1
provides the radar parameters used in the simulations of
the strip-map and spotlight SAR examples.
Figure 26.
Spotlight SAR mode Example.
Table 1.
SAR Simulation Parameters
Radar Parameter Strip-map
SAR
Frequency
Collection time
Bandwidth
PRF
Signal Power
Range Swath
Range
Number of
Channels
9.6 GHz
20 s
Spotlight
SAR
10 GHz
5 s
18.75 MHz 150 MHz
400 Hz
1000 Hz
1000 W 1000 W
4 km
47 km
300 m
65 km
13
INVERSE SYNTHETIC APERTURE RADAR (ISAR)
ISAR is typically employed to image targets that are in
motions, such as ships, moving ground moving vehicles,
aircraft, etc. In ISAR, the synthetic aperture is generated
by the motions of the targets relative to the radar and the
radar can be stationary on a turret or an airborne platform.
The ISAR geometry of a stationary radar and a rotating
target is similar to the spotlight SAR geometry of a stationary
target and a radar moving in a circular path. However,
unlike SAR modes where synthetic aperture is
known, synthetic aperture is unknown in ISAR mode due
to unknown target's motion; thus, it is much more difficult
forming range-Doppler ISAR images due to unknown
motions. To that extent, Figure 27 presents the generic
range-Doppler images of two ISAR datasets of a ship with
movements in the ocean generated using the M&S techniques
presented in this article. The figure on the left-hand
side is a ship with some translational and rotational
motions where the shape of the ship is still noticeable
while the ship on the right-hand side figure is unrecognizable
due to the fast movements of the ship during the collection
time. For the ISAR simulations, the bandwidth is
defined as 60MHz and the collection time is 1 second
Figure 27.
Range-Doppler images of a ship in motion using ISAR mode. Left: Case 1, Right: Case 2.
38
IEEE A&E SYSTEMS MAGAZINE
NOVEMBER 2022

IEEE - Aerospace and Electronic Systems - November 2022

Table of Contents for the Digital Edition of IEEE - Aerospace and Electronic Systems - November 2022

Contents
IEEE - Aerospace and Electronic Systems - November 2022 - Cover1
IEEE - Aerospace and Electronic Systems - November 2022 - Cover2
IEEE - Aerospace and Electronic Systems - November 2022 - Contents
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IEEE - Aerospace and Electronic Systems - November 2022 - Cover3
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