A design methodology of a tapped delay line adaptive array antenna

2005 ◽  
Author(s):  
S. Obote ◽  
Y. Ichikawa ◽  
K. Kagoshima
Keyword(s):  
Design Methodology ◽  
Delay Line ◽  
Array Antenna ◽  
Adaptive Array

scholarly journals Estimating Angle of Arrival (AOA) for Wideband Signal by Sensor Delay Line (SDL) and Tapped Delay Line (TDL) Processors

2018 ◽  
Vol 24 (4) ◽  
pp. 96
Author(s):  
Bassim Sayed Mohammed ◽  
Dalya Khalid Hasan
Keyword(s):  
Communication Systems ◽  
Delay Line ◽  
Array Antenna ◽  
Lms Algorithm ◽  
Adaptive Array ◽  
Optimum Number ◽  
Angle Of Arrival ◽  
Wideband Signal ◽  
Transversal Filter ◽  
Wideband Signals

Angle of arrival (AOA) estimation for wideband signal becomes more necessary for modern communication systems like Global System for Mobile (GSM), satellite, military applications and spread spectrum (frequency hopping and direct sequence). Most of the researchers are focusing on how to cancel the effects of signal bandwidth on AOA estimation performance by using a transversal filter (tap delay line) (TDL). Most of the researchers were using two elements array antenna to study these effects. In this research, a general case of proposed (M) array elements is used. A transversal filter (TDL) in phase adaptive array antenna system is used to calculate the optimum number of taps required to compensate these effect. The proposed system uses a phase adaptive array antenna in conjunction with LMS algorithm to work an angle of arrival (AOA) estimator for wideband signals rather than interference canceller. An alternative solution to compensate for the effect of signal bandwidth is proposed by using sensor delay line (SDL) instead of fixed delay unit since it has variable time sampling in the time domain and not fixed time delay, depending on the angle of arrival of received signals. The proposed system has the ability to estimate two parameters for received signals simultaneously (the output Signal to Noise Ratio (SNR) and AOA), unlike others systems which estimate AOA only. The comparison of the simulation results with Multiple Signal Classification (MUSIC) technique showed that the proposed system gives good results for estimating AOA and the output SNR for wideband signals. (SDL) processor shows better performance result than (TDL) processor. MUSIC technique with both (SDL) and (TDL) processors shows unacceptable results for estimating (AOA) for the wideband signal.    

scholarly journals Broadband Frost Adaptive Array Antenna with a Farrow Delay Filter

2018 ◽  
Vol 2018 ◽  
pp. 1-7
Author(s):  
Tao Dong ◽  
Qiushi Wang ◽  
Yunxiao Zhao ◽  
Lixia Ji ◽  
Hao Zeng
Keyword(s):  
Design Methodology ◽  
Weight Vector ◽  
Array Antenna ◽  
Adaptive Array ◽  
Adaptive Antenna ◽  
Filter Coefficient ◽  
Digital Beamforming ◽  
Farrow Structure ◽  
Direct Form ◽  
Time Update

In a broadband adaptive array antenna with a space-time filter, a delay filter is required before digital beamforming when the Frost algorithm is used to obtain the weight vector. In this paper, we propose a Farrow structure instead of a direct form FIR structure to implement the time delay filter since it can satisfy the demand for real-time update and is very suited for the FPGA platform. Furthermore, a new off-line algorithm to calculate the Farrow filter coefficient is presented if the filter coefficient is symmetric. Finally, simulations are presented to illustrate that the design methodology for the Farrow filter is correct. The simulations also prove that the Frost broadband adaptive antenna effectively mitigates the interferences with a Farrow filter.

scholarly journals Vehicular Delay-Tolerant Networks with Image Recognition-Based Adaptive Array Antenna for Winter Road Surveillance in Local Areas

2019 ◽  
Vol 11 (9) ◽  
pp. 203
Author(s):  
Uchida ◽  
Sato ◽  
Shibata
Keyword(s):  
Image Recognition ◽  
Surveillance System ◽  
Delay Tolerant Networks ◽  
Array Antenna ◽  
Future Research ◽  
Adaptive Array ◽  
Prototype System ◽  
Intelligent Transport System ◽  
Winter Road ◽  
Delay Tolerant

The rapid growth of the ITS (intelligent transport system) development requires us to realize new kinds of applications, such as the winter road surveillance system. However, it is still necessary to consider the network difficulty areas for LTE (long-term evolution) or 3G transmissions when one visits sightseeing spots such as ski resorts or spas in mountain areas. Therefore, this paper proposes a winter road surveillance system in the local area based on vehicular delay-tolerant networks. The adaptive array antenna controlled by image recognition with the Kalman filter algorithm is proposed as well to the system in order to realize higher delivery rates. The implementations of the prototype system are presented in this paper as well, and the effectivity of the radio transmission in the prototype system is realized by vehicular image recognition methods and the asynchronous voltage controls for antenna elements for the rapid directional controls of the radio transmission. The experimental results showed that the radio directional controls by the prototype system for the target vehicle can proceed within one second, and that the simulation with the GIS (geographic information system) map pointed out the delivery rates of the proposed method—which are better than those of the epidemic DTN (delay-tolerant networking) routing by the nondirectional antenna. The experiments of the proposed methods indicate a higher efficiency of the data transmissions—even in the mountain area. Furthermore, future research subjects are discussed in this paper.

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