Thanks for the Hires images. At close inspection and on a larger screen, the blue PCB is an industrial embedded PC with a 'radio control' feature set. The unoccupied pads suggest customer configuration by the OEM - who ever that is? One empty jumper looks like an SMT LVDS connector. The big TFT hole set might be for a ribbon connector in an PLCC application. To me, the processor suggests a BGA mobile Celeron or a dual core Atom, but the associated resistors suggest another type of AMD device. Any processor trainspotters here? See attached.
The red board top left might be the GPS/Accelerometer unit. I suggest the coax marked with a yellow-T could be the aerial. The blue boards under the long red board might be TX/RX signal mixers or preamps. The red board is a custom PSU strip for the blue boards. Plenty of LED status inidcators all over the board.
Lots of industry standard white blobs placed on the tallest parts. Cable connectors have been glued in. Note the white blobs deliberately placed over the inductors(?) on the RF lines. Someone must have noted 'adverse vibration' in testing.
Together, this is quite an interesting concept as it shows just what can be made from off the shelf - or out of the dumpster - parts. Thirty year's ago, a 'guidance' system would have employed hundreds of design and development engineers who created a bespoke system costing millions of dollars. One that would require constant updating and servicing. Today, a kid with a RPi and a robotics kit from AliExpress might be just as effective. Speculating, this processor board may have even come from something as mundane as a ticket machine (or that's what it said on the export license).