DocumentCode :
1515889
Title :
Low Probability of Intercept Antenna Array Beamforming
Author :
Lawrence, Daniel E.
Author_Institution :
Phase IV Syst. Oper. of Technol. Service Corp., Huntsville, AL, USA
Volume :
58
Issue :
9
fYear :
2010
Firstpage :
2858
Lastpage :
2865
Abstract :
A novel transmit array beamforming approach is introduced that offers low probability of intercept (LPI) for surveillance radar systems employing phased array antennas. Radar systems are often highly visible to intercept receivers due to the inherent two-way versus one-way propagation loss. In this paper, the traditional high-gain antenna beam scanned across a search region is replaced with a series of low-gain, spoiled beams. Keeping the transmit antenna gain low reduces the radar visibility, but the radar´s antenna performance remains unchanged as the original high-gain beam can be formed by processing the set of spoiled beams. Large transient power density radiated in a traditional scan is replaced with low power density persistently radiated at the target throughout the scan time. The detection performance of the radar is not affected since the total energy on the target is the same. Derivation of the complex weights to synthesize the high-gain patterns from the low-gain basis patterns is presented for both one-way and two-way beam patterns.
Keywords :
antenna phased arrays; antenna radiation patterns; array signal processing; phased array radar; probability; radar antennas; search radar; transmitting antennas; antenna array beamforming; antenna radiation; low-probability-of-intercept; phased array antennas; radar antenna; radar surveillance; radar visibility; transmit antenna; Antenna arrays; Antennas and propagation; Array signal processing; Performance gain; Phased arrays; Propagation losses; Radar antennas; Radar detection; Surveillance; Transmitting antennas; Antenna arrays; beamforming; low-probability of intercept; radar;
fLanguage :
English
Journal_Title :
Antennas and Propagation, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-926X
Type :
jour
DOI :
10.1109/TAP.2010.2052573
Filename :
5484594
Link To Document :
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