Radar Pulse Pattern Selection for Wireless Interference Avoidance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Radio interference between wireless communication devices and radar apparatuses, such as weather radar, is a significant issue due to overlapping frequency bands, and existing solutions like DFS functions in wireless LAN access points are not always effective in preventing interference.
Innovation Solution
A radar apparatus with a signal processing device that includes a pulse pattern selecting unit and a radio interference determining unit, which identifies and transmits specific pulse patterns to avoid interference with wireless communication devices, using a pulse pattern table and countermeasure table to determine and mitigate radio interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DFS function is mounted on wireless LAN access point to detect radar pulse patterns, then radio interference is avoided by changing channels, but the channel is interrupted for a certain time (e.g., 30 minutes) and interference is likely to occur again after interruption
Solution Approach 1:
The radar apparatus dynamically changes its pulse pattern based on detection results from the wireless communication device. When radio interference is detected, the radar switches to a different pulse pattern that is less likely to cause interference, creating a dynamic adaptation mechanism rather than static channel interruption
Solution Approach 2:
The radar apparatus performs preliminary detection of the pulse pattern before transmission to determine if it matches patterns that would interfere with wireless communication. This preliminary check allows the radar to select appropriate pulse patterns in advance that avoid interference without requiring channel interruption
2Reliability
If DFS function is mounted on wireless LAN access point, then radar pulse patterns can be detected, but the DFS function is not validated due to some cause and radio interference is likely to occur eventually
Solution Approach 1:
The wireless communication device provides feedback information to the radar apparatus about the detected pulse pattern and validation status of the DFS function. This feedback loop allows the radar to adjust its transmission strategy based on the actual state of the wireless communication device's interference avoidance capability
Solution Approach 2:
The radar apparatus acts as an intermediary that receives validation information from the wireless communication device and uses this information to adjust its own transmission behavior. Instead of relying solely on the DFS function of the wireless device, the radar becomes an active participant in the interference avoidance process
3Reliability
If radar apparatus transmits standard pulse patterns for radar operation, then radar detection and measurement functions operate normally, but radio interference occurs with wireless communication devices using the same frequency band
Solution Approach 1:
The radar apparatus applies different pulse pattern qualities to different operational conditions. When wireless communication is detected in the vicinity, the radar uses specially designed pulse patterns with local characteristics (different timing, frequency, or structure) that are less harmful to wireless communication while maintaining radar functionality
Solution Approach 2:
The radar changes parameters of its pulse pattern based on the operational environment. By adjusting pulse width, repetition interval, frequency, or other parameters according to the presence of wireless communication devices, the radar maintains its detection capability while reducing interference to communication systems
Data Source
AI summary
According to one embodiment, a radar apparatus includes a signal processing device that has a first circuit, a second circuit and a transmitter. The first circuit is configured to determine whether or not there is a radio interference based on a radio signal received via an antenna. The second circuit is configured to, when the first circuit determines that there is the radio interference, select a predetermined pulse pattern based on an avoiding function of a wireless communication device having the avoiding function of the radio interference, the predetermined pulse pattern being separately defined from a pulse pattern of transmission processing for operating a radar. The transmitter is configured to transmit from the antenna a radio signal matching the pulse pattern selected by the second circuit.