Comments by "LRRPFco52" (@LRRPFco52) on "Ukrainian Drone Strikes: Waging a New War" video.
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@Laotzu.Goldbug I've been in aerospace and defense since the 1970s. Some of the programs we worked on were the ALCM, SRAM, SRAM II, JDAM, and other guided weapons systems, so I'm quite familiar with what it takes to get a warhead on-target. Before JDAM, it was all INS-based.
The launch aircraft would get an update for its INS with Radar ground-mapping off known reference points before weapon separation, then pass that data to the missile so it would start off with the best available position references.
Degradation of INS was a real thing, especially with weather. GPS and other things take precision-guidance into a new generation since then. There are better off-the-shelf guidance systems nowadays available to civilians.
You do have to take terrain into consideration though, including altitude and solve for that if you want to fly a Nap Of the Earth profile.
With modern digital mapping from satellite-based programs, you could manually chart an NOE course into a corridor, or run a real-time terrain-following profile algorithm.
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