Vehicle Sensor Time-Frequency Coding for Chirp Interference Mitigation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The increasing integration of wireless detection and communication sensors in vehicles leads to significant interference issues, which can result in false alarms and degraded performance of autonomous vehicle systems, necessitating effective interference mitigation strategies.
Innovation Solution
A vehicular system and method utilizing time-frequency coding, where sensors generate and transmit chirp signals in orthogonal time-channels with time offsets, perform noise level determination, and employ processing logic for FFT and digital beamforming to mitigate interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple sensors transmit signals simultaneously or overlapping in time, then the productivity and functionality of the vehicle system is improved, but interference between sensors increases
Solution Approach 1:
The patent divides the time-frequency space into multiple orthogonal channels, segmenting the signal transmission resources. Each sensor is assigned a unique time-channel and frequency-channel combination, allowing multiple sensors to operate simultaneously without interference. This segmentation of the signal space enables parallel operation while maintaining signal integrity.
Solution Approach 2:
The patent introduces time-channel and frequency-channel dimensions to organize sensor signals. By allocating sensors across multiple dimensions (time offsets and frequency offsets), the system enables simultaneous operation of multiple sensors while maintaining orthogonality and preventing interference through dimensional separation.
2Reliability
If sensors use orthogonal time-channels with time offsets, then interference mitigation is improved, but the device complexity increases
Solution Approach 1:
The patent employs parameter changes by varying time-offsets and frequency-offsets for different sensors to create orthogonal channels. This systematic parameter variation allows for automatic orthogonality and interference mitigation without requiring complex adaptive processing, reducing the overall system complexity while maintaining high reliability.
3Productivity
If sensors transmit chirp signals with frequency offsets, then the ability to operate multiple sensors simultaneously is improved, but the difficulty of detecting and measuring signals increases
Solution Approach 1:
The patent implements feedback mechanisms where sensors detect signals from other sensors and use this information to adjust their own transmission parameters. This feedback loop enables automatic frequency offset estimation and compensation, simplifying the detection process while maintaining the ability to operate multiple sensors concurrently with frequency offsets.
Data Source
AI summary
A system and method for time-frequency coding for interference mitigation of sensors is presented that includes generating and transmitting, from a vehicle, a first chirp signal by a first sensor, in a first time-channel and in a first frequency-channel. The method may also include generating and transmitting, a second chirp signal by a second sensor, in a second time-channel and in the first frequency-channel and the receiving, by the first sensor, a first reflection signal from objects from the first chirp signal. In addition, there may be a receiving, by the second sensor, a second reflection signal from objects from the second chirp signal. In addition, the first time-channel is orthogonal to the second time-channel, and the transmitting of the second chirp signal is offset in time from the transmitting of the first chirp signal by an amount less than a duration of the first chirp signal.