研究目的
To evaluate the mitigation of multipath propagation in TDOA-based indoor passive localization systems using a beam steering broadband circular polarization antenna (BSBCPA) to improve positioning accuracy.
研究成果
The BSBCPA significantly mitigates multipath propagation in TDOA-based indoor localization, improving positioning accuracy by at least 51% compared to OLPA, with mean errors of 0.7 m and 0.82 m in different environments. This approach does not require complex calculations or depend on modulation formats, making it a promising solution for future indoor localization systems.
研究不足
The study is limited to static indoor environments with LOS and multipath; dynamic environments or non-LOS conditions are not addressed. The system requires synchronization via cables, which may not be practical for all applications. The bandwidth is fixed at 20 MHz, and the antenna design may have fabrication inaccuracies affecting performance.
1：Experimental Design and Method Selection:
The study involves designing and fabricating a BSBCPA with beam steering and circular polarization capabilities. A TDOA-based receiver system is implemented for indoor location estimation, using cross-correlation for TDOA estimation and quadratic interpolation for sub-sample accuracy.
2：Sample Selection and Data Sources:
Experiments are conducted in two indoor environments (conference room and laboratory) with line of sight and complex multipath conditions. A transmitter generates BPSK modulation signals with 20 MHz bandwidth in WLAN.
3：List of Experimental Equipment and Materials:
Equipment includes the BSBCPA, omnidirectional linear polarization antenna (OLPA) for comparison, vector signal generator (R&S SMBV100A), vector network analyzer (Keysight E5071C), RF switch (PE42641), low noise amplifier (BGB741LESD), FR4 substrates, and various cables and components.
4：Experimental Procedures and Operational Workflow:
The system consists of three reference nodes (RNs) and one target node (TN). For BSBCPA, omnidirectional scanning is performed by switching beams, and the beam with maximum received power is selected for TDOA estimation. TDOA is calculated using cross-correlation and quadratic interpolation, with outlier elimination.
5：Data Analysis Methods:
Statistical analysis of positioning errors (mean error, standard variance) is performed over 100 TDOA calculations per position, using NI LabVIEW for data processing.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
