There is an interesting twist to the guidance package, the APKWS mounts a fixed laser seeker on each wing, as opposed to the traditional gimballed laser seeker in the nose.
It's certainly mechanically simpler. My guess would be that the deltas between the 4 seekers are used to get a precise aim point with the processor.
It's called the Distributed Aperture Semi-Active Laser Seeker (DASALS) a good example of using computing power to make a simpler and cheaper device.
Note for the metrically disinclined 70mm= 2.75-inch rocket.
BTW, here is some video pr0n of the system (4m 16s):
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