Multi-mode Radar Pulse Control for Attenuation Compensation
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Solution Overview
Problem
Conventional radar systems for measuring liquid levels in large storage tanks face challenges with high frequency pulse attenuation and interference, leading to inaccurate measurements and significant financial losses due to errors in tank level gauging.
Innovation Solution
A multi-mode pulse radar system with automatic transmit pulsed signal control, operating in the K-band frequency range, adjusts pulse width and amplitude based on signal attenuation to maintain signal quality and accuracy, using a variable pulse generator and digital signal processing to switch between different signal modes for varying distances and conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If higher frequency pulse radars are used, then measurement accuracy and antenna size are improved, but signal attenuation increases
Solution Approach 1:
The radar system dynamically adjusts pulse parameters (width, amplitude, frequency) based on real-time signal conditions and distance measurements. The controller modifies transmit pulse characteristics adaptively to maintain optimal signal-to-noise ratio while compensating for frequency-dependent attenuation, enabling high-frequency radars to operate effectively at longer distances.
Solution Approach 2:
The system changes multiple pulse parameters simultaneously (frequency, width, amplitude) based on measured distance and signal quality. By adjusting these parameters in combination, the radar maintains measurement accuracy while compensating for attenuation effects that increase with higher frequencies and longer propagation distances.
2Loss of energy
If lower frequency pulse radars are used, then signal attenuation is reduced, but measurement accuracy and antenna size worsen
Solution Approach 1:
The radar system dynamically switches between frequency bands and adjusts pulse parameters based on distance to target. For closer measurements, higher frequencies are used for better accuracy, while for distant targets, the system adapts parameters to maintain adequate signal strength, effectively overcoming the limitations of both low and high fixed-frequency systems.
Solution Approach 2:
The radar system is designed to operate across multiple frequency bands (C-band, K-band, Ka-band) and can switch between them based on measurement requirements. This multi-functionality allows a single system to achieve both the long-range capability of low-frequency radars and the high-precision measurement of high-frequency radars by selecting appropriate operating parameters.
3Area of moving object
If higher frequency radars are used, then antenna size is reduced, but signal attenuation increases
Solution Approach 1:
The system dynamically adjusts transmit pulse amplitude and width compensating for the higher attenuation experienced by high-frequency signals. This allows the use of smaller high-frequency antennas while maintaining adequate signal-to-noise ratio through real-time parameter optimization based on measured distance and signal quality.
4Loss of energy
If lower frequency radars are used, then signal attenuation is reduced, but beam-width increases
Solution Approach 1:
The radar system dynamically selects operating frequency and adjusts pulse parameters based on the required measurement precision and distance. For applications requiring narrow beam-width, the system switches to higher frequencies with appropriate parameter adjustments to compensate for increased attenuation, thereby achieving both directional precision and adequate signal strength.
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
This approach enables more accurate and reliable liquid level measurements from longer distances with higher precision, reducing errors and maintaining a stable signal-to-noise ratio, thus minimizing financial losses in the oil and gas industry.
Implementation Method 1
RAdio Detection And Ranging (Radar) has been used as a type of non-contact product level gauge for several decades
Implementation Method 2
The object or surface reflects part of the emitted radar signal/wave back in the direction of the antenna
Implementation Method 3
higher frequency pulse radars do not withstand signal attenuation compared to lower frequency pulse radars
Data Source
Figure 1
Figure 2
AI summary
A multi-mode pulsed radar method (200) for sensing or measuring a product material in a storage tank includes providing (201) a measure of radar signal attenuation for pulsed radar signals transmitted to the product material. Automatic adjustment (202) of one or more transmitted radar pulse parameters is implemented by selecting a pulse width and a pulse amplitude based on the measure of radar signal attenuation. In signal mode 2 higher amplitude and/or wider pulses are selected when the measure of radar signal attenuation is relatively high and in signal mode 1 lower amplitude and/or narrower pulses are selected when the measure of radar signal attenuation is relatively low. The radar pulse is transmitted (203) to the product material using the selected pulse width and the pulse amplitude. The target signal reflected or scattered (204) from the product material is processed to determine at least one parameter, such as product level.