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The small degrees of freedom (DOFs) and low SNR of incoming signal lead to direction of arrival (DOA) estimation performance degradation. A spacetime signal processing method for DOA estimation is presented. This method takes advantage of the spatial and temporal statistics of the incoming signal, expanding the dimensions of covariance matrix by increasing the time delay taps which can reduces the...
This study presents the use of contiguous aperture antenna radome as a method of generating circularly polarized signals from a linear polarization antenna which locates under the structure. The simulated results of the novel structure with single antenna and 2∗2 antennas array are demonstrated for L-band operation. It is shown that 3dB axial ratio bandwidth of 42 MHz and 32 MHz can be achieved with...
Aimed at the problem of the near-field imaging in real time, a near-field narrow 2-D imaging algorithm based on the combination of single-input multiple output array (SIMO) and synthetic aperture radar (SAR) is proposed. By combining a real aperture and synthetic aperture, a 2-D synthetic aperture plane which is in terms of spatial sampling to obtain the target scattering information is synthesized...
This paper proposes a novel approximation for the round-trip distance of the near-field echoed data based on a planar 2-D synthetic aperture planar array. A near-field narrow imaging algorithm based on the novel approximation is proposed. Comparisons of the proposed approximation and the Fresnel approximation are also demonstrated. The errors of the proposed approximation are negligible when the antenna...
Interference suppression is an essential work and has great influence on the stability of GPS receiver. In this paper, an improved adaptive method of joint polarization and spatial domain is proposed to suppress interference by using the dual-polarized information. Simulation results show that it can effectively mitigate the interference signals and does not require knowledge of the directions of...
Direction estimation for multiple targets is an important technique for electronic surveillance systems. Based on the given optimized antenna array, the multiple targets direction estimation algorithm with monobit sampling for wideband receivers is proposed. The conventional FFT operation, multi-beam forming, and angle ration lookup table have been involved in the proposed method as the important...
In the advanced Supply Chain/Logistic system, RFID system adapts the radio waves to scan and record the data received from RFID tags. The RFID readers can be placed up to a few meters away from RFID tagged objects. According to the investigation conducted by EPCglobal, the readers are still unable to achieve 100% reading rates, and it means the Wal-Mart and its suppliers could not reach complete reading...
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