Radar Transmission Time Interval Randomization for Interference Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As more vehicles deploy radar-based detection systems, interference becomes a significant issue, affecting the accuracy and reliability of radar systems in high-interference environments, such as those with multiple radar waveforms overlapping.
Innovation Solution
The implementation of transmission time interval (TTI) randomized radar transmissions, where radar waveforms are varied across multiple TTIs based on specific radar transmission parameters, including waveform, antenna, and modulation parameters, to orthogonalize, suppress, or shape interference, using a codebook of parameters to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radar waveforms are transmitted using fixed transmission time intervals, then the radar system operates with simple timing control, but interference increases as more vehicles deploy radar-based detection systems
Solution Approach 1:
The patent applies dynamics by making the transmission time interval variable rather than fixed. The radar system dynamically adjusts the TTI based on detected interference conditions and selected code sequences, transforming a static timing parameter into an adaptive one that responds to environmental conditions and other radar transmissions.
Solution Approach 2:
The patent changes the timing parameter (transmission time interval) to reduce interference. By varying the TTI according to selected code sequences from codebooks, the system modifies the temporal characteristics of radar transmissions to avoid coherent integration of interference from other radars.
2Measurement precision
If radar transmissions use standardized time intervals, then coordination between systems is simplified, but signal-to-noise ratio deteriorates in high-interference environments
Solution Approach 1:
The patent applies preliminary action by pre-defining codebooks containing multiple code sequences with known correlation properties before transmission. These codebooks are prepared in advance and selected based on interference conditions, allowing the system to quickly switch to appropriate timing patterns without complex real-time calculations.
Solution Approach 2:
The system uses feedback by monitoring interference conditions and adjusting the transmission time interval accordingly. The radar detects the presence and characteristics of other radar signals, then selects appropriate code sequences from codebooks that will minimize interference, creating a closed-loop adaptive system.
3Reliability
If multiple radar systems transmit simultaneously with fixed timing, then system synchronization is maintained, but ghost target errors increase due to interference
Solution Approach 1:
The patent applies segmentation by dividing the transmission time into distinct code-based segments rather than using uniform intervals. Each code sequence from the codebook creates a unique temporal signature that can be distinguished from other radar transmissions, allowing the receiving radar to identify and reject interference corresponding to different code sequences.
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
Certain aspects provide a method for radar detection by an apparatus. The method including transmitting a radar waveform in transmission time intervals (TTIs) to perform detection of a target object. The method further includes varying the radar waveform across TTIs based on one or more radar transmission parameters.