Radar Device Optimizing Optical Conditions for Wind Speed Measurement
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Solution Overview
Problem
Conventional radar devices face challenges in achieving high-accuracy wind measurements when aerosol density is low, and they struggle to improve data acquisition speed while maintaining signal intensity, especially when measuring wind speed at long distances or with high scanning speeds.
Innovation Solution
A radar device equipped with an optical oscillator, light transmitter and receiver, spectrum and speed calculator, and optical condition adjuster, which optimizes optical conditions by determining the signal-to-noise ratio threshold to enhance measurement accuracy and speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If N incoherent integrations are performed to improve SNR, then measurement accuracy is improved, but data acquisition speed decreases
Solution Approach 1:
The patent applies dynamics by making the number of integrations variable rather than fixed. The integration count is dynamically adjusted based on real-time SNR calculations and aerosol density conditions, allowing the system to optimize between measurement accuracy and acquisition speed adaptively.
Solution Approach 2:
The patent changes the parameter of integration count based on SNR thresholds and measurement requirements. By calculating SNR after each integration and comparing it against thresholds, the system adjusts the number of integrations to achieve optimal balance between accuracy and speed.
2Productivity
If the number of integrations is decreased to improve data acquisition speed, then productivity is improved, but signal intensity decreases
Solution Approach 1:
The patent implements feedback by continuously calculating SNR after each integration step and using this information to determine whether to continue integrating or to proceed with the current measurement. This feedback mechanism ensures signal intensity requirements are met while minimizing unnecessary integrations.
3Productivity
If scanning speed is increased to improve productivity, then data acquisition speed is improved, but reception coupling efficiency degrades
Solution Approach 1:
The patent applies preliminary action by pre-calculating optimal integration counts and SNR thresholds before beginning measurements at different scanning speeds. This allows the system to maintain reception coupling efficiency even when operating at higher scanning speeds by having optimization parameters ready in advance.
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 high-accuracy wind speed measurements at desired distances in a short time by optimizing optical conditions, improving signal intensity, and maintaining data acquisition speed.
Implementation Method 1
an optical oscillator that oscillates light
Implementation Method 2
a light transmitter and receiver that has an optical system that emits the light oscillated by the optical oscillator into atmospheric air and also receives the above-mentioned light which is reflected by an observation object existing in the atmospheric air
Implementation Method 3
receives laser light which receives a Doppler frequency shift according to the movement speed of an aerosol in the atmospheric air
Implementation Method 4
performs heterodyne detection on the laser light and local light, thereby detecting a Doppler signal corresponding to the wind speed
Implementation Method 5
an optical condition adjuster that adjusts an optical condition of the light transmitter and receiver
Data Source
AI summary
An optimal position analysis unit 24 specifies an optimal installation position for a photodetector 6 by using spectra which by a spectrum and wind speed computing unit 23 calculated by analyzing output data of a photodetector 6 installed at different installation positions, controls a position adjustment made by an optical unit adjustment driving unit 7, and optimizes the installation position of the photodetector 6.