
doi: 10.2514/3.28589
The problem of photographing an orbital target from another satellite is examined from the viewpoint of the primary target-tracking-sensor which, in this case, is a radar. A brief examination of the orbital dynamics of a near miss encounter is presented, followed by consideration of radar angle noise and the resultant influence on field of view, exposure, and dynamic resolution. For simultaneous, coradial apogees with differential altitudes up to 8 naut miles, it is found that both target line of sight and closing rates are reasonably constant for target distances greater than 20 naut miles. For a tracking radar rms angle noise value of about 1.5 mrad in a time constant of about 0.5 sec, it is found that significant loss of images falling outside the field of view, because of tracking noise, begins at target ranges of 20 naut miles; beyond 50 naut miles a related loss of resolution of 30% or greater is experienced for those images that do appear within the field of view of the camera system.
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