Virtual Antenna Array for ISAR Target Position Adjustment
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Solution Overview
Problem
Existing systems using inverse synthetic aperture radar (ISAR) for security inspection face challenges in obtaining highly accurate information due to difficulties in receiving radio waves from moving targets, leading to inaccuracies in inspection images.
Innovation Solution
The system employs a configuration with first to fourth transmission antennas and a plurality of reception antennas, where the processor acquires and processes signals from these antennas to generate information about the measurement target, utilizing a virtual antenna array to adjust for changes in the target's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If ISAR technology is used to reduce the number of antenna elements, then system cost and size are reduced, but measurement precision deteriorates
Solution Approach 1:
The patent creates virtual transmission antennas by combining signals from multiple physical reception antennas. Specifically, it forms virtual antennas at positions corresponding to the measurement target by processing received signals through correlation with reference signals, effectively copying the functionality of additional transmission antennas without adding physical components.
Solution Approach 2:
The patent introduces a correlation processing mechanism as an intermediary between the physical reception antennas and the virtual transmission antennas. This intermediary process involves correlating received signals with reference signals to extract information about the measurement target, enabling the system to achieve the functionality of a full antenna array with a reduced physical array.
2Productivity
If the system uses movement of the measurement target to obtain information, then security inspection can be completed with fewer antenna elements, but the reliability of obtained information deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously monitors the movement of the measurement target and adjusts the correlation processing accordingly. By using the movement information to optimize the correlation process and selectively process signals based on target position changes, the system maintains high reliability while achieving efficient inspection completion.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows for the generation of high-accuracy inspection images despite changes in the target's position, reducing interference and improving the reliability of security inspections.
Implementation Method 1
a radio wave radiated from the antenna array toward a measurement target such as a person is reflected by the measurement target and received by the antenna array
Data Source
AI summary
According to one embodiment, a system includes first to fourth transmission antennas, a plurality of reception antennas, and a processor. The processor is configured to acquire a first signal of radio waves which are transmitted by the first and third transmission antennas in a case where the measurement target is at a first position, acquire a second signal of radio waves which are transmitted by the second and fourth transmission antennas in a case where the measurement target is at a second position, and generate information of the measurement target by using the first and second signals. A first interval between the first and third transmission antennas and a second interval between the second and fourth transmission antennas are the same.