Pseudo Randomized Chirp Scheduling for Vehicle Radar Interference
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Solution Overview
Problem
Existing vehicle radar systems, particularly MIMO systems, face interference issues when multiple radars operate on the same frequency band, leading to reduced performance in dense environments and increased maintenance costs.
Innovation Solution
A method and apparatus that utilize a random number generator to create varying frame intervals for transmitting radar frames, preventing synchronization and thus minimizing interference between radars, while maintaining a constant frame rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple radars operate on the same frequency band, then the quantity of radars and coverage area increase, but mutual interference occurs and performance decreases
Solution Approach 1:
The patent implements periodic radar frame transmission with pseudo-randomly varied frame intervals. Each radar transmits frames at regular intervals, but the interval duration is pseudo-randomly adjusted based on previous interval measurements. This periodic transmission pattern with random variations allows multiple radars to share the frequency band while avoiding synchronized interference, as the pseudo-random interval adjustments desynchronize the transmission timing of different radars.
2Stability of the object's composition
If fixed frame intervals are used for radar transmission, then the frame rate remains constant, but synchronization between multiple radars causes interference
Solution Approach 1:
The patent introduces dynamic adjustment to the frame interval while maintaining overall frame rate stability. The system measures the actual frame interval between transmissions and pseudo-randomly varies the next interval based on this measurement. This dynamic adjustment prevents fixed synchronization patterns that cause interference, while the controlled variations maintain acceptable frame rate consistency for radar operation.
Solution Approach 2:
The system implements feedback by measuring the actual frame interval between radar transmissions and using this measurement to determine the next frame interval. The measured interval feeds into a pseudo-random variation algorithm that adjusts the timing of subsequent transmissions. This feedback mechanism ensures that frame rate remains stable while introducing timing variations that prevent synchronization interference between multiple radars.
3Area of stationary object
If multiple radars transmit simultaneously on the same frequency, then detection coverage improves, but signal interference reduces measurement precision
Solution Approach 1:
The patent uses periodic transmission with pseudo-random interval variations to allow multiple radars to operate simultaneously on the same frequency band. Each radar transmits frames periodically, but the pseudo-random adjustments to frame intervals create timing offsets between different radars. This approach maintains comprehensive detection coverage from multiple radars while preventing signal interference that would degrade measurement precision.
Data Source
AI summary
Methods and systems are provided for controlling a radar system of a vehicle. One or more transmitters are configured to transmit radar signals. A plurality of antennas or arrays are configured to operate at a common frequency and a method and system for generating random frame intervals and receiving the radar signals in response to the random frame intervals.