Table 3-3. Uses of C3I Devices and Facilities POSSIBLE MISSION OR USE ABBREVIATION DEVICE/FACILITY Command and control C ^2 Space traffic control center C^2 center at launch facility C^2 center at LEO base C^2 center at GEO base C^2 center at power satellites C^2 center at rectennas Communications Comm. Radio links Laser links Surveillance and S&R Cameras reconnaissance Telescopes Radars Lidars Signal intelligence SIGINT Radio receivers A special category of S&R use of radio receivers is the collection of signal intelligence (SIGINT). Two types of intelligence data can be obtained from SIGINT collection: electronic intelligence (ELINT) and communications intelligence (COMINT). ELINT provides data on the characteristics of RF emitters such as radars (e.g., frequency, power, and waveform) and on noncommunications transmissions (e.g., telemetry). COMINT is obtained from analysis of communications patterns between various nodes in a C^3 network (traffic analysis) and the reading of messages transmitted between the nodes. If these messages are not transmitted in plain language (which is the usual case), analysis of the system used to encipher or encrypt the messages is required before the messages can be read. All of the possible uses outlined in Table 3-3 are considered to be real threats. All can be performed given currently existing technology. Except perhaps for use of SPS C^2 centers for military C^2 purposes, none of these uses of SPS appear to offer great advantages over dedicated space systems independent of the SPS.
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