Phased array antenna optimization deployment method suitable for ultrahigh frequency RFID positioning system
A phased array antenna and positioning system technology, applied in design optimization/simulation, advanced technology, geometric CAD, etc., can solve problems such as difficult to apply to actual scenarios, slow convergence, unsatisfactory optimization results, etc.
Pending Publication Date: 2022-07-12
TIANJIN POLYTECHNIC UNIV
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Problems solved by technology
[0003] In recent years, researchers have proposed a variety of solutions to the RNP problem, but they still face the following challenges: 1) The existing solutions to the RNP problem mainly use the reader antenna with a fixed radiation pattern and ideal propagation conditions for channel modeling, Not only is it difficult to apply to actual scenarios, but it also increases the difficulty of deployment; 2) The existing solutions to RNP problems usually define the objective function with a fixed operating frequency, which limits the feasibility of the solution; 3) Existing solutions mainly use evolutionary computing and The swarm intelligence algorithm solves RNP problems, but for complex optimization problems, the existing optimization algorithms have problems such as slow convergence and unsatisfactory optimization results
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[0024] The invention uses the omnidirectional dipole antenna as the tag antenna and the phased array antenna as the reader antenna, establishes a channel model based on the phased array antenna and multipath effect, and accurately estimates the forward link between the reader and the tag. Received field strength P r，T and the received field strength P received by the reader in the backward link r，R
[0025]
[0026]
[0027] where κ is the modulation efficiency, μ T is the power transfer efficiency, ρ L is the polarization loss factor, P Tx is the transmit power of the reader, and are the gains of the tag antenna and the reader antenna in the direct path, respectively, and L(d) is the path loss factor under multipath conditions.
[0028] In order to accurately estimate the gain, the antenna gain model under discrete conditions is established in the space rectangular coordinate system, such as figure 2 As shown in (a), assuming that the half-wave dipole antenna ...
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The invention belongs to the technical field of mobile communication, and relates to a phased array antenna optimization deployment method suitable for an ultrahigh frequency RFID positioning system. The method comprises the following specific steps: establishing a channel model based on a phased-array antenna and a multipath effect; establishing an antenna gain model under the discrete condition to accurately estimate the gain, and establishing an antenna gain model under the simultaneous condition to complete the estimation of the receiving field intensity value of the reader; the method comprises the following steps: establishing an RFID network planning (RNP) problem model, and proposing that amplitude fluctuation based on a narrow band reflects the degree of multipath influence on a system so as to further determine an optimization objective function; and designing an improved chicken flock algorithm integrating an improved cock monomer turbulence strategy and a hen grey wolf updating strategy to optimize the RNP problem, and obtaining an optimal deployment mode of the phased array reader antenna. Compared with a traditional RNP solution, the method provided by the invention has remarkable advantages in the aspects of reducing system complexity, improving deployment precision, improving optimization time consumption and the like.
Description
technical field [0001] The invention belongs to the technical field of mobile wireless communication, and relates to a phased array antenna optimal deployment method suitable for an ultra-high frequency RFID positioning system. Background technique [0002] With the advent of the Internet of Everything era, the demand based on the Internet of Things continues to increase. Radio Frequency Identification (RFID), as the key driving force of the Internet of Things, has been widely used in various fields. , RFID) technology is widely used in logistics management, warehouse management and other scenarios with the advantages of low cost and fast reading speed. In the large-scale UHF RFID positioning system, the deployment of readers is a key problem that needs to be solved urgently. The problem of how to deploy readers and how many readers to deploy is defined as RFID Network Planning (RNP) problem. RNP is considered to be a large-scale network deployment method that conforms to t...
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IPC IPC(8): G06K7/10G06F30/17G06F30/27G06N3/00
CPCG06K7/10346G06K7/10099G06K7/10207G06F30/17G06F30/27G06N3/006Y02D30/70
Inventor 史伟光雷丽君王薇
Owner TIANJIN POLYTECHNIC UNIV