The DIY space research community and cubesat developers have recently revived discussions surrounding CoCom (Coordinating Committee for Multilateral Export Controls) regulations imposed on commercial GPS receivers. These rules, designed during the Cold War to prevent the use of global positioning systems in long-range guided weapons, are currently presenting significant hurdles for non-military scientific projects.
Background & Causes
The original CoCom regulations required commercial GPS receiver manufacturers to disable devices if they exceeded certain physical thresholds. Specifically, the GPS system would automatically shut down if the device moved at speeds above 1,900 km/h (about 1,000 knots) or at altitudes above 18,000 meters (about 60,000 feet). The initial goal was to prevent the construction of cheap ICBMs using consumer-grade positioning components.
Technical Analysis & Technology
The core technical controversy lies in how individual GPS chip manufacturers interpret the rules. Some manufacturers design chips according to an "OR" logic—meaning the GPS will lock as soon as the device exceeds either limit (altitude OR speed). This causes direct failure for meteorological balloons, which fly very high but move extremely slowly. Conversely, some manufacturers apply an "AND" rule, only locking the device when both altitude and speed limits are exceeded simultaneously, allowing high-flying, slow-moving objects to operate normally.
Expert Opinions & Insights
Many aerospace engineers and researchers on forums like Stack Exchange point out that these regulations have become obsolete in the modern positioning era. Rigidly applying CoCom filters on cheap GPS module firmware creates unnecessary procedural barriers for low-altitude cubesat testing or stratosphere research. Developers are forced to seek specially configured chips or undergo complex export licensing processes.
Impact & Future
The lack of uniformity in how semiconductor manufacturers implement CoCom limits continues to be a headache for amateur and academic aerospace engineers globally. In the future, as small satellite constellations and high-altitude balloon research expand, a clearer and updated legal standard for civilian positioning equipment is highly necessary to foster scientific innovation.