Parameterized FM Coded Waveforms for Spectral Control and Low Sidelobes
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Solution Overview
Problem
Existing radar waveforms, such as phase-coded and frequency-modulated waveforms, face challenges in achieving high spectral control, flexibility, and reducing sidelobes while maintaining low computational complexity, which limits their performance in high-power radar systems.
Innovation Solution
A method for designing a high freedom parameterized frequency-modulated coded waveform that ensures phase continuity, precise spectral control, and parameterized coding capability by integrating an instantaneous frequency function to generate waveforms with adjustable characteristics, supporting zero-order, first-order, and second-order coding models to optimize bandwidth, pulse width, and sidelobe levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If phase-coded waveforms or frequency-modulated waveforms are used in radar systems, then the radar can achieve basic detection capability, but the spectral control precision and sidelobe reduction performance are insufficient
Solution Approach 1:
The patent applies dynamics by making the waveform parameters adjustable and adaptive. The frequency-modulated coded waveform allows dynamic adjustment of modulation depth, pulse width, and frequency characteristics to optimize spectral control precision for different detection scenarios, transforming static waveform designs into dynamic, adaptable systems.
Solution Approach 2:
The patent employs parameter changes by systematically varying key waveform parameters including modulation depth, pulse width, frequency deviation, and coding sequence characteristics. These parameter adjustments enable precise control over spectral distribution and sidelobe levels, directly addressing the spectral control precision requirement while maintaining manageable design complexity through structured parameter optimization.
2Object-affected harmful factors
If high-power radar systems use existing waveforms, then the radar can achieve required power output, but the sidelobe levels remain high causing interference and reduced detection accuracy
Solution Approach 1:
The patent converts the potentially harmful high sidelobe levels into beneficial low sidelobe characteristics through careful design of the frequency-modulated coded waveform. By optimizing the modulation characteristics and coding sequences, the system transforms what would be interference-prone high-power signals into clean, low-sidelobe waveforms that enhance rather than degrade detection accuracy.
Solution Approach 2:
The patent incorporates feedback mechanisms in the waveform design process by using autocorrelation analysis and spectral evaluation to iteratively optimize the waveform parameters. The design accounts for the actual sidelobe performance and adjusts modulation depth, pulse width, and frequency characteristics based on measured or simulated feedback, ensuring detection accuracy is maintained while minimizing sidelobe interference.
3Adaptability or versatility
If conventional waveform designs are used, then the system structure remains simple, but the flexibility and adaptability of waveform characteristics are limited
Solution Approach 1:
The patent achieves universality by designing a frequency-modulated coded waveform that can serve multiple radar functions through parameter adjustment. The same waveform generation system can produce different waveform characteristics (linear frequency modulation, nonlinear frequency modulation, varying pulse widths) to suit different detection scenarios, target types, and interference conditions, replacing multiple specialized waveforms with one adaptable design.
Solution Approach 2:
The patent applies dynamics by enabling real-time or adaptive adjustment of waveform characteristics including frequency deviation, modulation index, pulse width, and coding sequence selection. This dynamic capability allows the radar system to adapt waveform parameters based on target characteristics, clutter conditions, and detection requirements, providing flexibility without requiring complex hardware changes.
4Measurement precision
If complex waveform processing is applied to reduce sidelobes and improve spectral control, then detection performance improves, but computational complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-designing and pre-optimizing the frequency-modulated coded waveform parameters to achieve low sidelobes and good spectral control in the time domain. The waveform is constructed with built-in characteristics (through careful selection of modulation depth, frequency deviation, and coding sequences) that inherently produce desirable autocorrelation and spectral properties, reducing or eliminating the need for complex post-processing computational algorithms.
Data Source
AI summary
The embodiments of the present disclosure provide a method for designing a high freedom parameterized frequency-modulated coded waveform, comprising: S1: obtaining a frequency-modulated coded vector; S2: selecting a coding model order to be utilized; S3: obtaining an parameterized instantaneous frequency function of a signal based on the frequency-modulated coded vector and the coding model order, integrating the parameterized instantaneous frequency function to obtain a phase of the signal, and generating the high freedom parameterized frequency-modulated coded waveform. Embodiments of the present disclosure provide a high freedom parameterized frequency-modulated coded waveform. The waveform has a continuous phase function, precise spectral control, and is configured to have a parameterized frequency-modulated waveform with high freedom.