Sequence Sending Modes for Low-Interference Radar Sensing
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Solution Overview
Problem
Existing radar technologies face challenges in achieving both perfect auto correlation and cross-correlation properties with single-carrier waveforms, leading to reduced sensing accuracy and increased interference between multiple radars.
Innovation Solution
A signal sending method that involves determining sequence sending modes for a communication apparatus to send different sequences in different periods, utilizing cyclic shifts to reduce auto and cross-correlation interference, thereby improving sensing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sequence with good auto correlation property is used to improve sensing accuracy, then sensing accuracy is improved, but cross-correlation property deteriorates leading to increased interference between radars
Solution Approach 1:
The patent segments the sensing signal transmission into multiple time periods, with each period using a different sequence sending mode. This temporal segmentation allows the system to switch between sequences with different correlation properties, thereby managing the trade-off between auto-correlation performance and cross-correlation interference.
Solution Approach 2:
The patent implements periodic switching between different sequence sending modes across multiple time periods. Each period uses a predetermined sequence sending mode from a set of N modes, creating a periodic pattern that systematically manages correlation properties over time to balance sensing accuracy and interference reduction.
2Object-generated harmful factors
If different sequences are used by different radars to reduce interference, then cross-correlation property is improved, but auto correlation property deteriorates reducing sensing accuracy
Solution Approach 1:
The patent introduces dynamic selection of sequence sending modes based on the specific operational context. Each radar can dynamically choose from N predetermined modes, allowing the system to adaptively balance cross-correlation interference reduction with auto-correlation sensing performance based on environmental conditions and interference levels.
Solution Approach 2:
The patent changes the parameter of sequence selection by introducing N different sequence sending modes with varying correlation properties. By switching between these modes with different cyclic shift values and sequence configurations, the system can adjust the balance between cross-correlation performance and auto-correlation performance as needed.
3Stability of the object's composition
If a single sequence is repeatedly sent to maintain consistent sensing performance, then sensing stability is improved, but interference from other radars using the same sequence increases
Solution Approach 1:
The patent segments the signal transmission into N different time periods, each using a different sequence sending mode. This segmentation ensures that while each individual period maintains consistent sensing performance through its designated mode, the overall system reduces interference by varying the sequence characteristics across periods.
Solution Approach 2:
The patent maintains continuous sensing capability across all N time periods by ensuring each period has a predetermined sequence sending mode. This continuity of useful action ensures sensing performance is maintained throughout, while the variation across periods prevents interference accumulation that would occur with repeated identical sequences.
Data Source
AI summary
A signal sending method and a communication apparatus are disclosed. The signal sending method includes: A first communication apparatus determines N sequence sending modes, and sends a first signal based on a first sequence sending mode. The N sequence sending modes include the first sequence sending mode. The sequence sending modes indicate sending orders of N sequences, the N sequences are sent by the first communication apparatus in N periods, and N is a positive integer greater than 1. A cyclic shift value between sending orders indicated by any two adjacent sequence sending modes is 1. The first sequence sending mode is determined based on K second sequence sending modes and the N sequence sending modes, the K second sequence sending modes correspond to a second communication apparatus, and K is a positive integer.