Radar Azimuth Measurement Using Temporal Signal Processing
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Solution Overview
Problem
Existing radar systems, particularly the mono-pulse system, struggle to accurately measure the azimuth angles of multiple targets when they have identical Doppler frequencies, leading to potential erroneous detection and reduced reliability.
Innovation Solution
A radar apparatus with a signal processing circuit that combines data from reception antennas at slightly different times to create a unit data set, allowing for the determination of azimuth angles by analyzing the change in intensity of reception signals, effectively increasing the number of antennas and avoiding signal synthesis from multiple targets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the mono-pulse system uses two reception antennas to measure azimuth angles, then the measurement speed is improved, but the accuracy deteriorates when multiple targets have identical Doppler frequencies
Solution Approach 1:
The patent transitions from spatial differentiation (multiple antennas at different positions) to temporal differentiation (multiple measurements at different times). By taking azimuth angle measurements at two different time points and comparing the results, the system can distinguish between multiple targets even when they have identical Doppler frequencies, thereby resolving the measurement accuracy problem while maintaining measurement speed.
Solution Approach 2:
The patent changes the measurement parameter from static spatial configuration to dynamic temporal sequence. Instead of relying solely on the spatial arrangement of antennas, the system performs repeated measurements over time and uses the temporal variation in signal characteristics to differentiate between targets, thus improving azimuth angle measurement accuracy for multiple targets with identical Doppler frequencies.
2Measurement precision
If the scanning system enlarges the antenna area to restrict the emission beam finely, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The patent replaces the mechanical approach of using large-area antennas with complex beam restriction structures with a signal processing approach. By performing azimuth angle measurements at different times and comparing the results through computational methods, the system achieves fine beam restriction and high measurement precision without requiring complex mechanical antenna structures.
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
Enables accurate measurement of azimuth angles for multiple targets with identical Doppler frequencies, reducing erroneous detection and improving the reliability of output data by distinguishing between individual targets.
Implementation Method 1
it can be seen that the target is present in the direction of the azimuth angle with strong reception intensity... Doppler shift of frequency
Data Source
AI summary
A radar apparatus capable of determining the position of targets at a high accuracy even when plural objects of an identical relative velocity are present in a detection view field of the radar, using signal processing of obtaining an effect which is similar with that of virtually increasing the number of antennas along the moving direction of the radar by determining the change of intensity of reception signals using data in the past in which an identical antenna was positioned at a slightly different place (T1) and data at present (T1+ΔT) as a unit data set.