OFDM Radar Signal Processing Reduces Inter-Channel Interference
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Solution Overview
Problem
Conventional OFDM communication radar systems face a tradeoff between improving radar function and maintaining communication function, with radar performance being deteriorated due to the design characteristics of OFDM signals, leading to velocity ambiguity and inter-channel interference issues.
Innovation Solution
A radar signal processing method and apparatus that transmits OFDM signals, receives analog signals, converts them to digital, and performs coarse and fine compensation operations to obtain target velocities, reducing inter-channel interference and resolving velocity ambiguity without modifying the OFDM transmission signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the OFDM signal is modified to improve radar function, then radar performance is improved, but communication function is deteriorated
Solution Approach 1:
The patent segments the signal processing into distinct radar-specific processing steps (coarse de-chirping, fine de-chirping, range-Doppler mapping) separate from the communication OFDM signal structure. This allows the communication signal to remain unchanged while applying radar-optimized processing to extract velocity information, thus improving radar performance without compromising communication function.
Solution Approach 2:
The patent introduces an intermediary processing stage that converts the received OFDM signal into a radar-appropriate format through de-chirping operations and range-Doppler mapping. This intermediary transformation enables the system to extract radar velocity information from communication signals without modifying the original communication signal, resolving the contradiction between radar and communication functions.
2Reliability
If conventional OFDM signal processing is used, then communication function is maintained, but velocity ambiguity and inter-channel interference occur
Solution Approach 1:
The patent changes the processing parameters by applying radar-specific de-chirping operations and range-Doppler mapping that are optimized for velocity estimation. By transforming the signal processing parameters from communication-optimized to radar-optimized, the system achieves accurate velocity estimation while maintaining compatibility with OFDM communication signals, thus resolving the velocity ambiguity and inter-channel interference issues.
Data Source
AI summary
Provided is a radar signal processing method based on Orthogonal Frequency Division Multiplexing (OFDM). The method includes transmitting an OFDM transmission signal to at least one target, receiving an analog reception signal reflected from the at least one target, converting the analog reception signal into a digital reception signal, obtaining a first velocity of the at least one target based on the digital reception signal, and processing the digital reception signal based on the first velocity to obtain a recovery signal having reduced inter-channel interference.