FMCW Polarimetric Radar System Using RF Switch and Bilateral Symmetry Correction
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Solution Overview
Problem
Conventional image radar systems using pulse radar technology are complex, power-intensive, and difficult to miniaturize, limiting their application in obtaining high-resolution, fully polarimetric images due to their reliance on single polarization and high-power radio wave transmission.
Innovation Solution
An image radar system employing a fully polarimetric frequency modulation continuous wave (FMCW) with a signal generator producing a triangle-wave frequency modulation signal, using vertically and horizontally polarized antennas to generate and receive signals, and a signal processor performing range compression, azimuth FFT, and bilateral symmetry correction to produce high-resolution fully polarimetric radar images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If pulse radar is used for image radar system, then high power radio waves can be radiated for image acquisition, but system complexity increases and miniaturization becomes difficult
Solution Approach 1:
The patent changes the fundamental operating parameters of the radar system from pulse modulation to FMCW (Frequency Modulation Continuous Wave) operation. This parameter change allows the system to achieve sufficient transmitted power while using continuous low-power signals instead of high-power pulsed signals, thereby enabling miniaturization and reducing system complexity while maintaining image acquisition capability
Solution Approach 2:
The patent replaces the traditional pulse radar mechanism with an FMCW radar mechanism that uses frequency modulation of continuous waves. This substitution eliminates the need for high-power pulse generation and complex pulse timing control systems, allowing the use of simpler, lower-power components that can be miniaturized
2Device complexity
If single polarization is used in image radar, then system complexity is reduced, but image resolution and target classification capability deteriorate
Solution Approach 1:
The patent merges multiple polarization channels (vertical and horizontal) into a single FMCW radar system by using an RF switch to time-multiplex the transmission of vertically and horizontally polarized signals. The receiver processes both polarization components, combining them to generate fully polarimetric images with enhanced target classification capability and resolution while maintaining manageable system complexity through integrated processing
3Reliability
If pulse radar with high power transmission is used, then image acquisition capability is improved, but power consumption increases making miniaturization difficult
Solution Approach 1:
The patent changes the power transmission parameter from high-power pulsed operation to low-power continuous wave operation with frequency modulation. This parameter change maintains sufficient signal strength for reliable image acquisition through the coherent integration of FMCW signals while dramatically reducing peak and average power consumption, enabling portable and miniaturized radar systems
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 high-resolution, fully polarimetric radar images with reduced system complexity and power consumption, enabling efficient image acquisition and analysis of geographic features, and is suitable for smaller, more portable applications.
Implementation Method 1
a signal generator that generates a frequency modulation signal which is linearly changed over time
Implementation Method 2
a transmitter that radiates the frequency modulation signal as vertical polarization and horizontal polarization at a pulse repetition interval using a vertically polarized transmit antenna and a horizontally polarized transmit antenna
Implementation Method 3
a receiver that receives a signal in which a vertically polarized signal and a horizontally polarized signal radiated at the pulse repetition interval are reflected from an object
Implementation Method 4
a signal processor that obtains a fully polarimetric radar image based on bilateral symmetry correction and azimuth compression with respect to each of the VV/HV polarization data set and the VH/HH polarization data set
Data Source
AI summary
A high-resolution fully polarimetric frequency modulation continuous wave (FMCW) image radar system using an RF switch and an image processing method are provided. The image radar system includes a signal generator that generates a frequency modulation signal, a transmitter that radiates the frequency modulation signal as vertical polarization and horizontal polarization using a vertically polarized transmit antenna and a horizontally polarized transmit antenna, a receiver that receives a signal in which a vertically polarized signal and a horizontally polarized signal are reflected from an object, using a vertically polarized receive antenna and a horizontally polarized receive antenna, and generates a VV/HV polarization data set and a VH/HH polarization data set based on the signal received via the vertically polarized receive antenna and the horizontally polarized receive antenna, and a signal processor that obtains a fully polarimetric radar image based on bilateral symmetry correction and azimuth compression.