Weather Radar Antenna Array Synthesis
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Solution Overview
Problem
Existing weather radar systems are costly and inefficient due to the use of large antennas, requiring high rotational speeds and significant transmitter power, making them slow and expensive for scanning the entire sky and determining weather phenomena positions, speeds, and classifications.
Innovation Solution
A low-cost radar system utilizing an array of small antennas instead of a single large antenna, with multiple receiving antennas to reduce rotational speed and increase scanning speed, allowing for faster data collection and processing, and employing ROSAR technology to synthesize a large antenna aperture, enabling faster scanning and higher resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single large antenna is used for weather radar scanning, then good azimuth resolution is achieved, but the rotational speed requirement becomes excessively high and system cost increases
Solution Approach 1:
The patent divides a single large antenna into multiple smaller antennas (typically 4 or more) arranged in a circular array. Each small antenna contributes to synthesizing the equivalent of a large antenna aperture through coherent signal processing, thereby achieving the same azimuth resolution without requiring a single large physical antenna structure that would demand high rotational speeds.
Solution Approach 2:
The patent combines the signals from multiple small antennas through coherent integration and phase alignment to synthesize a large antenna aperture. This merging of multiple small antenna contributions creates an effective aperture equivalent to a large single antenna, achieving high resolution while using smaller, slower-rotating components.
2Measurement precision
If a single large antenna is used for weather radar scanning, then good azimuth resolution is achieved, but implementation cost increases
Solution Approach 1:
The patent segments the expensive large antenna into multiple smaller, less costly antenna elements. Each small antenna is simpler and cheaper to manufacture, install, and maintain. The array configuration with typically 4 or more elements distributes the cost across multiple components rather than requiring one expensive large antenna.
Solution Approach 2:
The patent uses multiple copies of identical small antenna designs rather than one unique large antenna. This standardization allows for economies of scale in manufacturing and simplifies maintenance, as replacement parts are identical and can be quickly swapped without complex custom fabrication.
3Productivity
If high rotational speed is used for scanning the entire sky, then complete sky coverage is achieved, but the system becomes slow and costly
Solution Approach 1:
The patent segments the scanning function across multiple stationary or slowly-rotating antenna positions rather than requiring one antenna to rotate at high speed. The array configuration allows the system to achieve complete sky coverage by sequentially or simultaneously activating different antenna elements, dramatically reducing the required rotational speed and associated mechanical complexity.
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 system achieves faster scanning and higher resolution, allowing for quick detection and classification of weather phenomena, reducing costs and implementation complexity while providing short-term forecasts and improved refresh rates for detecting fast-developing storms.
Implementation Method 1
The systems and processes of the radar type applied in meteorology existing in the market and for the observation of weather phenomena
Implementation Method 2
the reflected pulses 40, 50 are captured by the antenna
Implementation Method 3
a radar which uses the Rotor Synthetic-aperture radar (ROSAR, Rotor-SAR) technique, whereby the narrow beam characteristics normally provided by conventional large antennas are synthesized by means of small size antennas operating at high rotational speeds
Data Source
Figure 1~5
Figure 2
Figure 3
AI summary
Weather radar system which uses antennas constituted by the elongated aperture of waveguides, and form at least an array (510, 520) mounted on a rotating horizontal (502), and the said apertures are as wide as one wavelength (λ) and length higher than 20λ, wherein the small aperture in azimuth ranges from 0,5°to 2° and is synthetized by high rotational speeds together with signal processing techniques such as ROSAR.