Time-Division Multiplexing for Radar Interference Reduction
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Solution Overview
Problem
In autonomous driving vehicles equipped with separate long-range (LRR) and mid-range (MRR) radars, the interference between the radar signals from these two systems affects the detection of target objects, compromising driving safety.
Innovation Solution
A radio signal sending method and apparatus that allocate different data update periods for LRR and MRR radar signals, allowing them to be transmitted in distinct periods within a sending period, thereby reducing mutual interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate LRR and MRR radars transmit radar signals simultaneously, then both radars can perform detection functions, but the radar signals interfere with each other affecting detection accuracy
Solution Approach 1:
The patent implements periodic time-division multiplexing where LRR and MRR radars transmit radar signals in alternating time periods rather than simultaneously. The controller manages data update periods such that LRR performs long-range detection in certain periods while MRR performs mid-range detection in other periods, eliminating signal interference while maintaining both detection functions.
Solution Approach 2:
The patent segments the detection operation into distinct time slots for different radar functions. By dividing the detection cycle into separate periods dedicated to LRR and MRR operations respectively, the system avoids mutual interference between the two radar systems while preserving their individual detection capabilities.
2Reliability
If LRR radar receives MRR waveform signal and MRR radar receives LRR waveform signal, then signal reception is maintained, but detection results are affected and driving security is endangered
Solution Approach 1:
The system uses periodic time-division multiplexing to ensure that LRR and MRR radars receive signals only during their designated transmission periods. The controller synchronizes data update periods so that each radar receives only the waveform signals intended for it, preventing cross-contamination of signal types while maintaining reliable signal reception for both systems.
3Adaptability or versatility
If two separate radars are mounted for LRR and MRR detection, then detection coverage is improved, but device complexity increases
Solution Approach 1:
The patent merges the control functions of LRR and MRR radars into a single controller that manages time-division multiplexing operations. This unified control approach simplifies the overall system architecture by coordinating both radar systems through a centralized mechanism rather than requiring separate independent control systems, while still maintaining the benefits of dual-radar detection coverage.
Data Source
AI summary
A method related to processing interference between cooperative radars, where a radar obtains configuration information used to indicate a ratio of a quantity of first data update periods to a quantity of second data update periods in a sending period. The first data update period is used to send a first radio signal, and the second data update period is used to send a second radio signal. Waveform configurations of the first radio signal and the second radio signal are different, to effectively reduce mutual interference between the first radio signal and the second radio signal.