Title :
Strategies for minimizing the intercept time in a mobile communication network with directive/adaptive antennas
Author :
Oh, Jung-Hyun ; Scholtz, Robert A.
Author_Institution :
Commun. Sci. Inst., Univ. of Southern California, Los Angeles, CA, USA
Abstract :
For hostile communication environments, a non-centralized mobile communication network with directive/adaptive antennas and Global Positioning System (GPS) has been proposed for the purpose of minimizing the radio exposure and making it difficult for an interceptor to detect the signals. The directive antennas, however, cause a spatial search process to find the direction of the intended receiver and setup a link for communication. During this link setup process, an interceptor has the opportunity to observe the transmitter´s main antenna beam. This paper investigates the strategies for minimizing the intercept time when the interceptor uses a single beam antenna to detect the signal presence and find the transmitter direction. We adopt the Bayes´ rule to recursively update the directional a posteriori probabilities, which leads to a sequential decision problem. Four different algorithms to determine the next search direction based on the updated probabilities are compared through simulations
Keywords :
Bayes methods; Global Positioning System; adaptive antenna arrays; array signal processing; decision theory; direction-of-arrival estimation; directive antennas; land mobile radio; probability; radio networks; search problems; Bayes rule; GPS; Global Positioning System; adaptive antennas; algorithms; directional a posteriori probabilities; directive antennas; hostile communication environments; intercept time minimisation; link setup process; main antenna beam; noncentralized mobile communication network; radio exposure; search direction; sequential decision problem; signal detection; simulations; single beam antenna; spatial search process; transmitter direction; updated probabilities; Adaptive arrays; Adaptive signal detection; Directive antennas; Global Positioning System; Mobile antennas; Mobile communication; Receivers; Receiving antennas; Signal detection; Transmitting antennas;
Conference_Titel :
MILCOM 97 Proceedings
Conference_Location :
Monterey, CA
Print_ISBN :
0-7803-4249-6
DOI :
10.1109/MILCOM.1997.646727