1. AS nentioned above, the SDIO is developing the technology for EH launched intelligent projectiles. References 18-21 describe projectile (spacecraft) concepts that include power, propulsion, guidance, structure, telecomunications and command and control subsystems. These spacecraft have renote sensing instruments that enable them to carry out their mission. These concepts Were developed under the requirement to operate after being electromagnetically launched with 200,000 to 500,000 GS of acceleration. The mass of these spacecraft ranged from 1 to 5 kg. Table 3 presents a summary of the key characteristics of several SDIO conce ts for railgun launched xicro-spacecraft 2P.
2. W Approach (?Kcgram) Cm k9 !/artin 10-15 3-5 N/A Optical Semi Si Cetector FOG Roll .Uarietta Active Homing Ref. (EKDATC) Spin Rate
3. seeing 12 1 . 4 - 2 . 1 25 Passive Seeker Laser Eeam FOG (HAVE STING) Rider h IR Spin &
4. or nore are required. i g hG insensitive spacecraft subsystems and instruments are a key ingredient in the EXLHSC concept. fortunately significant amounts of technology work are going on in this area. First, the military is developing the technology for "intelligent" projectiles and nunitions that can be fired out of ordinary artillery cannons. Artillery cannons accelerate projectiles by about 5000-10000 GS and achieve exit velocities of about 1 km/s. Table 4 presents the characteristics of several functioning packages that survived high accelerations. Table 4 also includes a CCD inaqer that was tested to zo,ooo GS as a prototype inaqer for a NASA planetary penetrator.