Radar System Transmitter Cyclic Shift Interference
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Solution Overview
Problem
Concurrent radar systems often experience interference due to the use of identical or similar code sequences, which can lead to sub-optimal cross-correlation properties and inefficient operation.
Innovation Solution
A radar system that employs a transmitter-specific cyclic shift scheme for code regions, allowing each transmitter to uniquely identify itself and operate concurrently without interference, even when using the same code sequence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional radar systems use identical or similar code sequences, then the system complexity is reduced and ease of manufacture is improved, but interferences between concurrent radar systems increase and measurement precision deteriorates
Solution Approach 1:
The patent applies local quality by introducing transmitter-specific cyclic shifts to specific regions within code symbols. Instead of changing the entire code sequence, only certain regions (e.g., guard intervals or specific symbol portions) are cyclically shifted by transmitter-specific amounts. This localized modification maintains the overall code structure and ease of implementation while providing unique identification for each transmitter, thereby reducing interferences between concurrent radar systems.
Solution Approach 2:
The patent changes the temporal parameter of the code sequence by applying cyclic shifts to specific regions. Each transmitter applies a different cyclic shift amount to the same base code, transforming the time-domain structure of the signal. This parameter change enables receivers to identify different transmitters through correlation detection while maintaining the same code sequence, thus reducing interferences without increasing system complexity.
2Object-affected harmful factors
If conventional radar systems use different code sequences for each transmitter, then interferences are reduced, but device complexity increases and manufacturing becomes more difficult
Solution Approach 1:
The patent achieves universality by using a single base code sequence that serves all transmitters, with the only differentiation being the transmitter-specific cyclic shift applied to specific regions. This universal code structure can be used across multiple transmitters simultaneously, eliminating the need for each transmitter to have a completely different code sequence. The cyclic shift parameter acts as a configurable variable that provides unique identification without requiring separate code designs, thereby reducing device complexity while maintaining interference reduction.
3Productivity
If radar systems operate concurrently without cyclic shift differentiation, then productivity is improved and time efficiency increases, but interferences increase and reliability deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-configuring transmitter-specific cyclic shifts for each transmitter before concurrent operation begins. Each transmitter is assigned a unique cyclic shift pattern in advance, which is then applied to specific regions of the code sequence. This preliminary differentiation ensures that when multiple radar systems operate concurrently, their signals can be distinguished at the receiver through correlation detection, maintaining reliability while enabling high-productivity concurrent operations.
Data Source
AI summary
systems and methods include a transmitter with a control unit that is configured to generate a code, including data identifying a plurality of regions and a transmitter-specific cyclic shift scheme. The cyclic shift scheme results in a re-arrangement of the regions (using a change of time offset) that is different (transmitter-specific) for each of the transmitters. The transmitter generates a signal based on the code and transmits the signal via an antenna. The radar system includes a receiver configured to receive an echo of the signal via a second antenna that is reflected from a target and identifies the transmitter from the echo based on the transmitter-specific cyclic shift scheme.