Accession Number:

ADA063160

Title:

Automatic Null Steering/Surveillance Array System (ANSAS) for Global Positioning System (GPS) Application

Descriptive Note:

Final rept.

Corporate Author:

ARMY AVIATION RESEARCH AND DEVELOPMENT COMMAND ST LOUIS MO

Personal Author(s):

• Gray, Jack
• DeSantis, Charles M.
• Brown, Thomas J.

Report Date:

1978-12-01

Pagination or Media Count:

48.0

Abstract:

Global Positioning System Receivers can be affected by interference from unfriendly jammers. The ANSAS Automatic Null SteeringSurveillance array System for Global Positioning System GPS application is an ECM addition for GPS application which reduces GPS performance degradation by generating a spatial null in the antenna pattern in the direction of the interference source. Both automatic and manual modes of operation are available to the operator. ANSAS operates by sensing the interference environment and optimizes SJ ratio via spatial null formation under the guidance of a microprocessor controller. Control signals originating in the microprocessor drive Phase-Amplitude adjustments Complex Weights at the antenna elements such that a reduction in interference occurs after the summation of the antenna outputs. Author

Descriptors:

• *GLOBAL POSITIONING SYSTEM
• COMPUTER PROGRAMS
• MICROPROCESSORS
• ELECTRONIC COUNTER COUNTERMEASURES
• ANTENNA RADIATION PATTERNS
• MANPORTABLE EQUIPMENT
• ANTENNA ARRAYS
• ANTIJAMMING
• AUTOMATIC
• PHASED ARRAYS
• MICROWAVE RECEIVERS

Subject Categories:

• Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE