Dual Polarization Radar Self-Calibration via Built-In Test Equipment
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Solution Overview
Problem
Dual polarization radar systems face challenges in regular calibration and power balancing, as existing methods are limited by the need for specific weather conditions and inability to account for unequal losses in transmit channels, restricting calibration to specific times and lacking built-in test equipment for precise power adjustment.
Innovation Solution
A calibration system for dual polarization radar that includes a radar transmitter and receiver, a continuous wave test signal generator, and a variable ratio power divider to balance transmitted power and simulate weather conditions, enabling self-calibration and power balancing within the system, allowing for regular and time-independent calibration without external equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bird bathing calibration method is used, then calibration can be performed during light-to-medium strataform rainfall, but calibration cannot be performed on a regular or as-needed basis
Solution Approach 1:
The radar system performs self-calibration using built-in test equipment that generates test signals and automatically adjusts calibration parameters without requiring external calibration equipment or specific weather conditions. The system calibrates itself by transmitting test signals through the antenna and processing the returned signals to determine and adjust calibration settings.
Solution Approach 2:
The system performs calibration actions automatically and regularly without requiring manual intervention or specific weather conditions. The built-in test equipment enables preliminary calibration actions to be taken at scheduled intervals, ensuring the radar remains calibrated regardless of weather conditions.
2Measurement precision
If sun tracking calibration method is used, then receiver calibration can be performed, but only during short periods when the sun is positioned accurately
Solution Approach 1:
The radar system performs self-calibration using built-in test equipment that generates test signals and automatically adjusts calibration parameters without requiring external calibration equipment or specific weather conditions. The system calibrates itself by transmitting test signals through the antenna and processing the returned signals to determine and adjust calibration settings.
Solution Approach 2:
The system performs calibration actions automatically and regularly without requiring manual intervention or specific weather conditions. The built-in test equipment enables preliminary calibration actions to be taken at scheduled intervals, ensuring the radar remains calibrated regardless of weather conditions.
3Adaptability or versatility
If conventional radar systems are used, then basic detecting capabilities are provided, but dual polarization measurement capabilities are limited
Solution Approach 1:
The patent combines multiple functions into a single integrated radar system. The dual polarization radar integrates both horizontal and vertical polarization transmission and reception capabilities within a single system, along with built-in test equipment for calibration. This merging of functions provides enhanced measurement capabilities while managing system complexity through integration.
Solution Approach 2:
The radar system is designed with multi-functionality to perform various measurement tasks. The dual polarization capability enables the same system to measure different weather phenomena and provide both conventional radar detection and advanced polarimetric measurements, making the system universally applicable to multiple scientific and operational needs.
4Manufacturing precision
If built-in test equipment is added for power balancing, then power adjustment precision is improved, but device complexity increases
Solution Approach 1:
The radar system performs self-calibration using built-in test equipment that generates test signals and automatically adjusts calibration parameters without requiring external calibration equipment or specific weather conditions. The system calibrates itself by transmitting test signals through the antenna and processing the returned signals to determine and adjust calibration settings.
Solution Approach 2:
The patent combines multiple functions into a single integrated radar system. The dual polarization radar integrates both horizontal and vertical polarization transmission and reception capabilities within a single system, along with built-in test equipment for calibration. This merging of functions provides enhanced measurement capabilities while managing system complexity through integration.
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 precise power balancing and self-calibration of dual polarization radar systems, ensuring accurate measurement of weather phenomena and operational reliability by simulating weather conditions and compensating for atmospheric noise, enabling continuous and efficient operation.
Implementation Method 1
means for generating a continuous wave test signal; and a test signal generator that generates a continuous wave test signal
Implementation Method 2
a radar receiver that receives the horizontal and vertical polarization signals
Implementation Method 3
means for simulating a weather condition by adjusting the attenuation and Doppler phase shift of a continuous wave test signal
Data Source
AI summary
A calibration system for the receiver of a dual polarization radar system has been developed. The system includes a radar transmitter that transmits signals in horizontal and vertical polarizations and a radar receiver that receives the horizontal and vertical polarization signals. The system also includes a test signal generator that generates a continuous wave test signal. A calibration circuit for the radar receiver modifies the test signal to simulate weather conditions by adjusting the attenuation and Doppler phase shift of a continuous wave test signal.