Abstract
In order to achieve fast and accurate passive location of the target radiation source, this paper puts forward a Virtual Time Reversal Method Based on Uniform Linear Array (ULA-VTR) passive location algorithm. This framework employs the passive time reversal focusing theory, which does not to require the physical transmission of time reversal signals and does not require pre-estimation of the channel to realize passive direction finding. The above principle is utilized to perform the target radiation source signal through a uniform linear sensor array for detection. The article provides the signal model of linear time reversal array and the virtual retransmission process in the first place. Then utilizes ULA-VTR to establish a dual-station passive location framework and derives the coordinate transformation equation to find its observation angle, in addition, establishes the observation equation system for obtaining the site of the target radiation source. Ultimately, the paper analyses the computational complexity of the ULA-VTR algorithm and adopts Geometric Dilution of Precision(GDOP) to discuss the positioning performance. The experimental results indicate that the technique presented in this paper has higher positioning accuracy under the low SNR compared with other techniques.
Highlights
Passive positioning technology has better concealment and high safety factor than active positioning, so it is widely used in radar positioning, satellite navigation, underwater detection and other fields
A large number of scientific literatures have studied the algorithm from different aspects and obtained many research results. Researchers have turned their attention to passive positioning technology combining Time Difference of Arrival (TDOA) and Frequency Difference of Arrival (FDOA) [16]–[18], which is suitable for radar, electronic countermeasures (ECM), and navigation
A linear sensor array established as an observation station and selected a suitable site, a model of the two-dimensional time reversal array receiving the target radiation source signal is presented, in the place, the virtual time reversal processing which is a passive processing technology without signal transmission executed to obtain the direction finding angle of each observation station, and acquire the coordinates of the target radiation source by solving the equation system established by the direction finding angle
Summary
Passive positioning technology has better concealment and high safety factor than active positioning, so it is widely used in radar positioning, satellite navigation, underwater detection and other fields. This paper uses this feature to propose a virtual time reversal algorithm combined with crossing location technology to achieve precise positioning of the target radiation source. A linear sensor array established as an observation station and selected a suitable site, a model of the two-dimensional time reversal array receiving the target radiation source signal is presented, in the place, the virtual time reversal processing which is a passive processing technology without signal transmission executed to obtain the direction finding angle of each observation station, and acquire the coordinates of the target radiation source by solving the equation system established by the direction finding angle. ΘW in the figure represent the angle between the observation station and the target radiation source called azimuth angle, which can be obtained through the virtual time reversal passive direction finding algorithm.
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