Interference Signal Source Position Estimation Using Movable Antennas
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Solution Overview
Problem
Existing methods for estimating the position of an interference signal source are vulnerable to reflected waves, especially in indoor environments, and require expensive equipment for accurate positioning, with performance deteriorating in environments with many reflections and narrow bandwidths.
Innovation Solution
A method using two antennas, where the arrangement form is determined based on the environment, frequency, and bandwidth, with options for linear or circular arrays, and the antennas are arranged to minimize interference, with the second antenna being movable to enhance position estimation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If three or more stationary antenna array-based systems are used to estimate position, then direction information can be extracted, but the method is vulnerable to reflected waves and cannot precisely estimate position
Solution Approach 1:
The patent employs movable antennas instead of stationary antenna arrays. The antennas move along predetermined trajectories (linear or circular paths) to dynamically sample the interference signal from multiple positions, enabling position estimation without requiring large-scale stationary antenna installations and reducing vulnerability to reflected waves
Solution Approach 2:
The patent extracts only the necessary positional information from the interference signal by having antennas move along specific trajectories, rather than using complex multi-antenna array systems. This extraction approach focuses on obtaining position data while avoiding the reflected wave interference problems associated with traditional array methods
2Measurement precision
If expensive equipment with multiple antennas and channel-to-channel phase synchronization is used, then position can be accurately estimated irrespective of reflected waves, but the cost increases significantly
Solution Approach 1:
The patent uses simple, low-cost movable antennas that traverse along predetermined paths instead of expensive multi-antenna array systems with phase synchronization requirements. The movable antennas capture interference signals at different positions, achieving position estimation functionality with much simpler and cheaper equipment
Solution Approach 2:
The movable antenna system serves multiple functions: it performs position estimation, characterizes interference signals, and adapts to different environments (indoor/outdoor, narrow/wide bandwidth) using the same basic hardware platform, eliminating the need for specialized expensive equipment for each scenario
3Device complexity
If TDOA scheme with low-cost sensors is used, then sensor cost is relatively low, but performance deteriorates rapidly in indoor reflected-wave environment
Solution Approach 1:
The patent uses movable antennas that physically move to change their spatial relationship with the interference source and reflected waves. This dynamic positioning allows the low-cost sensors to capture interference patterns from multiple angles, improving position estimation accuracy in reflected-wave environments without increasing sensor cost
4Use of energy by moving object
If narrow bandwidth is used for interference signal analysis, then bandwidth requirements are reduced, but it becomes difficult to estimate the position of the interference signal
Solution Approach 1:
The patent adapts the antenna movement trajectory and spacing parameters based on the available bandwidth and environmental conditions. By adjusting these parameters, the system optimizes position estimation performance for the given bandwidth constraints, whether operating in narrow or wide bandwidth scenarios
Data Source
AI summary
Disclosed is a method of estimating a position of a signal source and a position estimation apparatus, the method including acquiring an environment, a frequency, and a bandwidth of the interference signal source, determining an arrangement form of the two antennas based on the environment, the frequency, and the bandwidth and arranging the two antennas, and estimating a position of the interference signal source based on an interference signal of the interference signal source and the two arranged antennas, wherein the environment includes an indoor environment and an outdoor environment.