Angle Measuring Device Azimuth Resolution Antenna Array
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Solution Overview
Problem
The existing radar systems with a single reception antenna face difficulties in broadening the antenna aperture in the azimuth direction, leading to low resolution in calculating the azimuth angle of a target, while they can calculate the elevation angle effectively.
Innovation Solution
An angle measuring device with multiple reception antennas is used, where signals from different transmission antennas are demodulated and processed to calculate the elevation and azimuth angles using monopulse angle measurement techniques, allowing for higher resolution in azimuth angle determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one reception antenna is used, then the device complexity is reduced, but the azimuth angle measurement resolution deteriorates
Solution Approach 1:
The reception system is segmented into multiple reception antennas arranged in the azimuth direction, with each antenna receiving signals from both transmission antennas. This segmentation enables the system to achieve high azimuth resolution by processing signals from multiple antennas independently while maintaining manageable complexity through modular architecture.
Solution Approach 2:
The patent introduces a new dimension by arranging multiple reception antennas in the azimuth direction, transforming a single-point reception system into a distributed array system. This dimensional expansion enables simultaneous measurement of both elevation and azimuth angles with high precision, resolving the contradiction between device simplicity and measurement capability.
2Measurement precision
If multiple reception antennas are added to broaden the antenna aperture in the azimuth direction, then the azimuth angle resolution is improved, but the device complexity increases
Solution Approach 1:
Each reception antenna in the array performs multiple functions: receiving signals from both transmission antennas, contributing to both elevation and azimuth angle measurements, and participating in monopulse angle measurement. This multi-functionality justifies the increased device complexity by delivering comprehensive measurement capabilities that would require even more complex single-antenna systems.
Solution Approach 2:
The patent merges the functions of multiple reception antennas into a unified processing system that simultaneously extracts elevation and azimuth information. By combining signals from all reception antennas and processing them through integrated signal processing, the system achieves high azimuth resolution without requiring separate dedicated systems for each function.
3Measurement precision
If monopulse angle measurement is used with multiple transmission antennas, then the elevation angle calculation is improved, but the signal processing complexity increases
Solution Approach 1:
The system performs preliminary signal separation by extracting first and second demodulated signals from the reception signals before performing angle measurement. This preliminary action organizes the complex signals into structured components, making the subsequent monopulse angle measurement more manageable and improving elevation angle calculation accuracy through systematic signal processing.
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
The device achieves higher resolution in calculating the azimuth angle of a target while maintaining effective elevation angle calculation, enhancing the precision of angle measurement compared to systems with a single reception antenna.
Implementation Method 1
The reception antenna receives each of the first signal reflected by the target object and the second signal reflected by the target object
Implementation Method 2
The radar disclosed in Patent Literature 1 calculates the elevation angle of the target object from the phase difference between the first signal received by the reception antenna and the second signal received by the reception antenna
Implementation Method 3
calculating an elevation of the target by performing monopulse angle measurement using a sum signal of the first demodulated signal and the second demodulated signal and a difference signal between the first demodulated signal and the second demodulated signal
Data Source
AI summary
An angle measuring device includes: a signal extracting unit for extracting a signal that includes a first reflection wave and does not include a second reflection wave as a first demodulated signal and a signal that includes the second reflection wave and does not include the first reflection wave as a second demodulated signal from reception signals output from one or more reception antennas among a plurality of reception antennas; an elevation calculating unit for calculating an elevation of a target by performing monopulse angle measurement using a sum signal of the first demodulated signal and the second demodulated signal and a difference signal between the first demodulated signal and the second demodulated signal; and an azimuth calculating unit for calculating an azimuth of the target using reception signals output from the plurality of reception antennas.