Now, I know that the Beam Riding system in for example, the Vikhr/AT-9 ATGM, the receiver for the missile is in the back, looking back at the aircraft to be guided.
I also know that the Semi Active Laser Homing system searches for reflected laser energy.
What are the disadvantages of each, and the advantages of each?
Oh, and SALH is the system used on Cobras and Apaches, and they're currently having a JAGM program (Joint Air to Ground Missile) that's supposed to replace the Maverick, TOW, and Hellfire in aircraft. The range is supposed to be greater then 20 kilometers, and if beam riding guidance supposedly has more range then SALH, why haven't we seen 20-plus km range ATGMs that are beam riding?