Radar Signal Processing Using Orthogonal Codes and Frequency Offsets
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Solution Overview
Problem
Existing radar signal processing technologies face challenges in efficiently combining and separating signals from loosely coupled radar units, leading to suboptimal resolution and spectrum allocation issues.
Innovation Solution
The method involves phase modulating radar signals with orthogonal codes and adding frequency offsets to enable efficient separation of combined radar signals received from loosely coupled radar units, allowing for higher resolution processing without dedicated physical spectrum allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radar signals from multiple loosely coupled radar units are combined and processed together, then signal resolution is improved, but spectrum allocation conflicts arise and signal separation becomes complex
Solution Approach 1:
The patent applies parameter changes by assigning different frequency offsets to signals from different radar units. This frequency domain parameter differentiation enables automatic signal separation during processing, resolving the contradiction between improved resolution from combined signals and the complexity of separating them. The frequency offset parameter allows receivers to distinguish and separate signals from different units without complex spatial or temporal separation mechanisms.
2Reliability
If dedicated physical spectrum allocation is used for each radar unit, then spectrum allocation conflicts are avoided, but spectrum utilization efficiency decreases
Solution Approach 1:
The patent merges the spectrum usage of multiple radar units by allowing them to operate in the same frequency band simultaneously. By combining signals in the frequency domain with different frequency offsets, the system achieves reliable operation without dedicated physical spectrum allocation, thus avoiding conflicts while maintaining high spectrum utilization efficiency. This merging approach eliminates the need for spectrum fragmentation.
3Device complexity
If frequency offsets are added to radar signals, then signal separation is simplified, but intermediate frequency spectrum availability is reduced
Solution Approach 1:
The patent applies segmentation by dividing the intermediate frequency spectrum into distinct segments or channels, each assigned to a specific radar unit through unique frequency offsets. This segmentation approach enables simplified signal separation while efficiently utilizing the available intermediate frequency spectrum, as each unit operates in its designated frequency segment without overlapping conflicts.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances signal resolution by separating the primary and cross-path signals effectively, avoiding spectrum allocation issues and ensuring full intermediate frequency availability for each path, thus improving radar processing efficiency.
Implementation Method 1
the first radar signal is phase modulated using a first code and wherein a first frequency offset is added to at least a portion of the first radar signal
Implementation Method 2
the combined radar signal includes a reflection of the first radar signal and the second radar signal
Data Source
AI summary
A method for processing radar signals includes emitting a first radar signal via a transmitting antenna of a first radar unit, where the first radar signal is phase modulated using a first code and a first frequency offset is added to at least a portion of the first radar signal, and emitting a second radar signal via a transmitting antenna of a second radar unit, where the second radar signal is phase modulated using a second code. The first code and the second code are orthogonal to each other and the first radar unit and the second radar unit are loosely coupled with each other. The method further includes receiving a combined radar signal via a receiving antenna of the first radar unit, where the combined radar signal comprises a reflections of the first and the second radar signals, and processing the combined radar signal at the first radar unit.