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The Global Positioning System A Shared National Asset (1995) / Chapter Skim
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Appendix J: Selective Denial of Civilian GPS Signals by the Military
Pages 249-252

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From page 249...
... In all cases, the issues of whether a C/A-code signal on L, or L2 could be selectively denied without severely impacting the existing military receiver inventory,, or whether a modified or enhanced military receiver would be needed were addressed. The preliminary assessment of these issues involved discussions with appropriate experts in the military GPS community (Captain Jay Purvis, National Air Intelligence Center; Mr.
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From page 250...
... Any ROD advantage would be eroded if inertial aiding and/or pulling antennas were employed by hostile units. Therefore, the NRC committee concluded that surgical jamming of the C/A-code centered at L~ or would cause operationally unacceptable consequences for Y-code users.
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From page 251...
... Selective Denial Jamming Option ROD (relative operating dB Post-Correlator distance ratio) Advantage Option 1 | 3.2 | 10 Narrow-band code on L2; shape II jammer spectrum; no receiver modification Option 2 37.5 32 Narrow-band code on L:; shape II jammer spectrum; ideal high-pass filter in receiver Option 3 31.6 30 Narrow-band code at first null of L2; shape I jammer spectrum; no receiver modification Option 4 91.2 39 Narrow-band code at first null of Lo; shape II jammer spectrum; no receiver modification Option 5 167 45 Narrow-band code at first null of L2; shape II jammer spectrum; fourth order band-stop filter Option 6 7,080 77 Narrow-band code at third null of L2; shape II jammer spectrum; no receiver modification Option 7 63 36 Wide-band code at third null of L2; shape II jammer spectrum; no receiver modification Option 8 630 56 Wide-band code at third null of L2; shape II jammer spectrum; receiver low pass modification
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From page 252...
... Shape I jammer follows sinc2 spectrum. Shape II jammer follows MSK (minimum shift key)
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Key Terms

  • selective denial
  • receiver modification
  • denial jamming
  • jammer spectrum
  • existing military

  • friendly receivers
  • code wipeoff
  • civilian signal
  • relative operating
  • pseudonoise jamming

  • third null
  • gps signal
  • military receiver
  • gps experts
  • military receivers

  • issues involved
  • unfriendly forces
  • enhanced military
  • william delaney
  • convolution techniques

  • unacceptable consequences
  • unfriendly units
  • follows msk
  • multiple jammers
  • involved discussions

  • jamming signals
  • activities addressing
  • reacquisition mode
  • noise jamming
  • adequate separation


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