The effects of any budget/program decisions made since the information was collected during 1997-98 are NOT reflected in the National Security Space Road Map (NSSRM).

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(U) PAVE Phased Array Warning System (PAWS)

Description (U):

(U) The unique aspect of the PAVE PAWS radar system is the dual-faced phased array antenna technology. This system differs from a mechanical radar that must be physically aimed at an object in space to track or observe it. The phased array antenna is in a fixed position and is part of the exterior building wall. Phased array antenna aiming, or beam steering is done rapidly by electronically controlling the timing, or phase of the incoming and outgoing signals. Controlling the phase, through the many segments of the antenna system, allows the beam to be quickly projected in different directions. This greatly reduces the time necessary to change the beam direction from one point to another, allowing almost simultaneous tracking of multiple targets while maintaining surveillance.

(U) The large fixed antenna array, using its beam focusing, improves system sensitivity and tracking accuracy. A phased array antenna, as any other directional antenna, receives signals from space only in the direction in which the beam is aimed. The maximum practical deflection on either side of antenna center of the phased array beam is 60 degrees. This limits the coverage from a single antenna face to 120 degrees. To provide surveillance across the horizon, the building housing the entire system and supporting antenna arrays is constructed in the shape of a triangle. The two building faces supporting the arrays, each covering 120 degrees, are therefore able to monitor 240 degrees. The array faces are also tilted back 20 degrees to allow for an elevation deflection from three to 85 degrees above the horizon. The lower limit provides receiver isolation from signals returned from ground clutter and for environmental microwave radiation hazard protection of the local area.

(U) The radar system is capable of detecting and monitoring a great number of targets that would be consistent with a massive SLBM attack. The system rapidly discriminates between vehicle types, calculating their launch and impact points in addition to the scheduling, data processing and communications requirements. The operation is entirely automatic, requiring people only for monitoring, maintenance and as a final check the validity of warnings. Three different computers communicating with each other form the heart of the system, which relays the information to Cheyenne Mountain AFB.

User Impact (U):

(U) Loss of this capability would have a significant impact on the Space Surveillance Network (SNN).

Programmatics (U):

(U) Operational.

• (U) Termination: 10/2010 (1QFY2011).
  
  (U) The termination date for the PAVE PAWS radars corresponds with the operation of the Long Range Dual Band Transportable Radar.

• (U) AFSPC: Funding Source.

Images (U):

This Table Is Unclassified.

Name	Title
PAVE PAWS	PAVE PAWS
PAVE PAWS	PAVE PAWS

Related Initiatives (U):

This Table Is Unclassified.

Name	Title
Beale	PAVE Phased Array Warning System (PAWS) at Beale
Cape Cod	PAVE PAWS (Phased Array Warning System) at Cape Cod
SCC/ALTERNATE SCC	Space Control Center (SCC)/Alternate SCC

Related Requirements (U): None.

Related Categories (U):

This Table Is Unclassified.

Name	Title
Collateral Sensors	Collateral Sensors

Road Map Placements (U):

This Table Is Unclassified.

Name	Title
National Security Space Road Map	Integrated System Road Map
SPACE CONTROL: S.S. NETWORK	SPACE CONTROL: SPACE SURVEILLANCE NETWORK

Requirements, Funding and Additional Hotlinks (U):

(U) None.

Lead Office (U):

Air Force.

(U) AFMC/SSSG/ND (SND C2 SPO)

Point of Contact (U):

(U) National Security Space Road Map Team, NSSA, Open Phone: (703) 808-6040, DSN 898-6040.

Date Of Information (U):

(U) 12 November 1997

(U) Road Map Production Date: 23 June 2001