Stepped Frequency Chirp Signal Generation for Radar Interference
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Solution Overview
Problem
Conventional radar systems face high false detection rates and complexity in differentiating targets and ghost targets in noisy environments, especially when multiple systems interfere with each other, leading to inaccurate target identification and high false detection rates.
Innovation Solution
A signal generating method using N-step linear stepped frequency modulated continuous waves, where two chirp signals with a time delay are combined to create a frequency modulated signal, reducing interference by configuring different time delays among radar systems, thereby minimizing false detection and enhancing resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional radar systems use the same form of transmission waves, then radar systems can estimate distance and speed of targets, but interference among radar systems increases greatly leading to high false detection rates
Solution Approach 1:
The patent applies parameter changes by modifying the transmission signal characteristics through different frequency modulation bandwidths and time delay configurations. Each radar system uses unique combinations of bandwidth and time delay parameters, allowing multiple systems to operate simultaneously without severe interference while maintaining accurate target detection capabilities
Solution Approach 2:
The patent segments the transmission signal into multiple chirp signals with different frequency modulation bandwidths and time delays. This segmentation allows the radar system to distinguish between reflected signals from actual targets and interference signals from other radar systems, thereby reducing false detection rates
2Reliability
If radar systems use conventional detection algorithms, then targets can be detected, but the detection algorithm becomes too complex
Solution Approach 1:
The patent implements preliminary action by pre-configuring distinct frequency modulation bandwidths and time delays for different radar systems before operation begins. This preliminary configuration simplifies the detection algorithm because the system can directly compare received signals against known transmission parameters without requiring complex signal processing to differentiate between self-interference and actual targets
3Productivity
If radar systems transmit signals simultaneously in noisy environments, then detection speed increases, but interference among systems increases leading to ghost targets
Solution Approach 1:
The patent uses frequency modulation bandwidth and time delay as intermediary parameters that mediate between multiple radar systems operating simultaneously. These intermediaries allow the system to maintain high detection speed while preventing ghost target generation, because the unique parameter combinations enable clear differentiation between actual targets and interference signals
Data Source
AI summary
A signal generating method for a radar system includes generating a first chirp signal and a second chirp signal having a first time delay relative to the first chirp signal; and combining the first chirp signal and the second chirp signal to determine a frequency modulated signal, wherein the first chirp signal and the second chirp signal are N-step linear stepped frequency modulated continuous waves having the same frequency modulation bandwidth, such that the frequency modulated signal includes i steps of the first chirp signal in a first duration, an interleaved combination of N−i steps of the first chirp signal and N−i steps of the second chirp signal in a second duration, and i steps of the second chirp signal in a third duration.