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By Elham Ghashghai

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Spread-Spectrum, Low-Power, Low-Sidelobe Techniques Can Be Combined for Intratheater Platforms Our analysis to evaluate the adequacy of current systems in a severe jamming environment found that the current systems are not adequate for robust communications. To address the challenges posed by a more severe jamming environment, a combination of spread spectrum and phased-array antennas with nulling capabilities will be required. The options we have discussed can help reduce vulnerabilities in the communications network, but each option has its unique limitations.

However, these links are not designed for more severe jamming environments or SIGINT receivers. 5” Lower-altitude platforms such as fighters and bombers 102 101 Data rate = 200 Mbps 2” 8” Higheraltitude platforms 1” (omni) NOTE: Assumptions: 10-dB margin air-to-air link (over 12-dB Eb/N0): air CDL link (AT-100) transmit/receive antennas with 200-W radiated power; 15 GHz. 1—Antenna Size, Data Rate, and Link Range Trade-Offs Spreading the Signal Over Time and Bandwidth Increases LPI/LPD But Degrades Link Capacity Spread-spectrum techniques produce LPI signals that are difficult to detect, read, or jam.

AFRL has estimated an operational UAV optical terminal at less than 150 lbs. ________________ 2 Interview with Roy Bondurant at Massachusetts Institute of Technology, Cambridge, MA, 2002; and with Hamid Hemmati at Jet Propulsion Laboratory, Pasadena, CA, 2002. See also Hemmati (2002). 33 5. The Answer Is in the Combination As the analysis in the previous chapter has suggested, there is no one solution for all situations and platforms. Options for a reliable and robust communications link may change depending on altitude, range, data rate, and threat.

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