Some of the images shown below were created with an earlier prototype of the IRAR sensor which was ground based, rather than with the flyable IRAR itself.
(130K) This GIF shows a moving tank from the IRAR in laser intensity, doppler velocity, boresight video, and combined intensity and velocity images. Note the uniform velocity of the tank's armored body and the different relative motion of the tank's treads and wheels. Some of the dust kicked up by the moving tank also can be seen in the velocity image.
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(70K) These images were all taken with an earlier ground-based prototype of the IRAR's flyable Doppler laser radar system, as is evident from the perspective. The leftmost GIF shows the velocity image of a helicopter executing a turning maneuver; red indicates target pixels exhibiting motion toward the radar transceiver; blue indicates target pixels exhibiting motion away from the radar transceiver. The second GIF shows the velocity image sequence of a car passing a moving truck in the rain. Note the readily distinguishable velocity difference between the truck and the passing auto. Note also the velocity detail of the truck's spinning front right wheel and the detected motion of one of the truck's windshield wipers. The 3rd GIF in this group shows a bicyclist being passed by an automobile. In addition to the velocity difference between the uniform velocities of the car and the bicyclist's upper body, note the detected velocity differences between the bicyclist's legs and the trunk of his body, showing the epicyclic pedalling motion.
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(70K) These three images taken from the flyable IRAR show a scene along Interstate 495 near
Boston. The leftmost image is boresight video, showing an interchange of a secondary road
with Route 495. Note that the backs of the aluminum traffic signs are in shadow and thus
dark in this image. The second image is the passive intensity image of the same scene. Note
that the aluminum road signs, which are quite hot in the summer heat, appear bright in this
image. The 3rd image in the sequence is the Doppler velocity image. Note that the velocity
difference between eastbound and westbound vehicles is evident. In addition, traffic on the
cross-road and the exit ramp to the left of the image are evident in the Doppler image,
which detects the high velocity contrast of these objects, whereas they are not visible in
the video and passive images since their reflectance and temperatures do not offer strong
contrast with the background.
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