Radar Signal Processing Using Overlapping Division Bands
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Solution Overview
Problem
The step frequency radar scheme is limited by low scan speed and inefficiency due to its characteristic of generating wideband signals over time, which restricts its application in high-resolution, rapid sensing of road traffic facilities, necessitating a method to enhance channel discontinuity and phase adjustment in division band radar schemes.
Innovation Solution
An apparatus and method that utilize a multi-channel OFDM scheme to irradiate radar signals in overlapping division bands, integrating reflected signals to achieve a high-quality impulse response signal by overlapping channel frequencies and removing phase discontinuities and DC components at channel boundaries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If step frequency scheme is used to generate wideband signal, then signal quality and resolution are improved, but sensing speed deteriorates
Solution Approach 1:
The patent divides the wideband signal into multiple division bands and processes them through multiple channels simultaneously. Each channel handles a specific frequency band, allowing parallel processing that maintains high resolution while significantly improving sensing speed compared to sequential step frequency approach
Solution Approach 2:
The patent transitions from time-domain sequential signal generation (step frequency) to frequency-domain parallel processing (multi-channel OFDM). By utilizing the frequency dimension for parallel channel operation, the system achieves both high resolution and fast sensing speed
2Speed
If division band radar scheme is implemented, then sensing speed is improved, but channel discontinuity and phase adjustment problems occur
Solution Approach 1:
The patent applies phase adjustment techniques to ensure phase continuity across channel boundaries. By compensating for phase differences and aligning phases at boundary frequencies, the system maintains signal reliability and continuity while utilizing multiple division bands for fast sensing
Solution Approach 2:
The patent implements DC component removal and phase adjustment mechanisms that continuously monitor and correct signal characteristics at channel boundaries. This feedback approach ensures reliable signal integration across division bands while maintaining high sensing speed
Data Source
AI summary
Disclosed is an apparatus for processing a radar signal, including: a transmitting unit which irradiates a plurality of baseband signals as a plurality of division band penetration signals to a target object based on a channel frequency; a receiving unit which receives a plurality of reflection signals reflected from the target object to integrate the received reflection signals as an integration band response signal; and a control unit which sets the channel frequency so that at least some bands of adjacent division band penetration signals among the plurality of division band penetration signals are overlapped with each other.