Varying Radar Chirp Delay and Phase for Ghost Target Management
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Solution Overview
Problem
In wireless communication systems, multiple radars face interference issues due to shared frequency bands, leading to inaccurate detection and collision avoidance, particularly in scenarios like cellular vehicle-to-everything (C-V2X) systems, where ghost targets are difficult to differentiate from actual targets.
Innovation Solution
Implementing techniques that vary the delay and phase of radar signals, allowing communication devices to apply distinct delays and phases to each chirp, creating unique patterns that differentiate between signals and enable effective management of ghost targets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple radars operate in shared frequency bands, then radar coverage and detection capability are improved, but interference between radars increases leading to ghost targets and inaccurate detection
Solution Approach 1:
The patent applies parameter changes by varying the delay and phase of radar signals across different transmissions. Specifically, it changes the temporal characteristics (delay) and spectral characteristics (phase) of the radar waveform to create unique signal signatures that allow differentiation between own radar returns and interfering radar signals from other devices operating in the same frequency band.
Solution Approach 2:
The patent implements dynamics by making the radar signal characteristics time-varying rather than static. The delay and phase parameters are dynamically adjusted for each transmission, creating a dynamic signal signature that evolves over time. This allows the radar to distinguish between static ghost targets and dynamic actual targets through pattern recognition of the time-varying signal characteristics.
2Reliability
If radar signals are transmitted continuously to maintain detection capability, then detection coverage is improved, but power consumption increases
Solution Approach 1:
The patent applies periodic action by transmitting radar signals in discrete chirp bursts rather than continuous transmission. Between chirps, the radar transmitter remains inactive, consuming minimal power. The periodic chirp structure maintains detection capability through regular sampling while significantly reducing average power consumption compared to continuous transmission.
Solution Approach 2:
The patent maintains continuity of useful action by using overlapping chirp sequences and coherent integration techniques. Even though transmission is periodic rather than continuous, the detection capability remains continuous through signal processing that integrates information from multiple chirps, ensuring no detection gaps while minimizing active transmission time.
3Reliability
If delay patterns are varied to differentiate radar signals, then ghost target management is improved, but signal processing complexity increases
Solution Approach 1:
The patent implements feedback by using the known delay pattern sequence as a reference for correlation-based signal processing. The receiver correlates the received signal with locally generated replicas of the transmitted delay patterns, providing feedback verification of target authenticity. This feedback mechanism enables simple yet effective discrimination between ghost targets (which don't match the delay pattern) and actual targets (which do match).
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A communication device may generate a radar signal including a set of waveforms (e.g., chirps) based at least in part on a waveform configuration of the communication device. Each respective waveform of the set of waveforms may be associated with at least one parameter of a set of parameters. A value of the at least one parameter may be different for each respective waveform of the set of waveforms (e.g., each chirp of a set of chirps). The communication device may transmit the generated radar signal during at least one frame of a set of frames.