Radio Sensing Device Antenna Scanning Randomization
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Solution Overview
Problem
The rapid proliferation of 24-GHz short-range radars for vehicle safety systems leads to increased risks of radio interference between adjacent devices, particularly in densely populated areas, due to the limited frequency bandwidth and spatial resolution, necessitating a method to minimize interference without increasing costs or hardware.
Innovation Solution
The introduction of 'direction hopping' via a switching control unit that uses random number generation to alter the scanning orders of antennas, allowing them to change scanning directions randomly, thereby reducing the likelihood of continuous beam direction alignment between adjacent devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple short-range radar sensors are deployed for wide-angle monitoring, then the coverage area and detection capability are improved, but the probability of radio interference between adjacent devices increases
Solution Approach 1:
The patent applies dynamics by making the beam scanning order variable rather than fixed. The switching control unit randomly changes the sequence in which multiple antennas are scanned, so that the beam directions at any given moment are dynamically adjusted. This prevents continuous alignment of beam directions between adjacent radar devices, thereby reducing radio interference while maintaining wide-angle coverage.
Solution Approach 2:
The patent changes the parameter of scanning order by introducing randomness into the antenna selection sequence. Instead of a predetermined fixed order, the switching control unit varies the scanning sequence based on random numbers, thereby changing the temporal and spatial parameters of beam emission. This parameter variation effectively reduces the probability of interference without compromising detection coverage.
2Device complexity
If fixed scanning orders are used for simplicity, then the device complexity is reduced, but the radio interference probability increases due to continuous beam alignment
Solution Approach 1:
The patent introduces dynamic randomness into the scanning control process. The switching control unit uses random number generation to determine the scanning order of multiple antennas, making the system adaptive and variable rather than static. This dynamic approach increases interference avoidance capability while adding only minimal control complexity through software-based randomization.
Solution Approach 2:
The system performs self-regulation by automatically adjusting its own scanning order based on random number generation without requiring external coordination with adjacent radar devices. Each radar device independently manages its beam scanning sequence, making the interference reduction mechanism self-contained and无需 complex inter-device communication or coordination protocols.
3Measurement precision
If beam directions are continuously monitored in fixed patterns, then the detection precision is maintained, but the time consumption increases due to repeated scanning of the same directions
Solution Approach 1:
The patent applies dynamics by varying the scanning order randomly, which prevents redundant repeated scanning of the same beam directions in fixed patterns. By changing the sequence of antenna activation, the system covers the same detection area with different temporal patterns, reducing time waste while maintaining comprehensive coverage and detection precision through complete cyclic scanning.
Data Source
AI summary
A radio sensing device includes N antennas, N being a natural number which is one or more, a switching control unit that sequentially switches the antennas and scans radio waves in some directions or all directions in a circular shape or a spherical-shell shape, and a random number generating unit that generates random numbers. The switching control unit performs an operation of switching selecting orders of the N antennas on the basis of the generated random numbers within a time which is M (M; positive integer) times a unit time required to sequentially scan each of all the N antennas once.