That appears to be a TQFP-120, and there aren't that many MCUs available in that package; I'm almost willing to bet it's a Renesas/Fujitsu part.
GPS + GSM modules are available (now - maybe not when this thing was designed) which would shrink the whole tracker down to one module, a few voltage regulators and related passives, and a battery:
GPS + GSM modules are available (now - maybe not when this thing was designed) which would shrink the whole tracker down to one module, a few voltage regulators and related passives, and a battery:
http://wm.sim.com/producten.aspx?id=1058