Orthogonal Phase Modulation for Radar Detection and Communication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing automotive radar systems face challenges in efficiently enabling both radar detection and communication with other traffic participants, requiring significant technical effort and being less robust, especially when targets move outside a certain angular space.
Innovation Solution
A method of orthogonal modulation of phase-modulated continuous wave (PMCW) radar waves using a sequence of numerical communication symbols, involving equidistant bi-phased or multi-phased phase-modulation sequences, outer coding, and specific communication ranges in the complex number plane, allowing for robust communication without disturbing detection sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If radar systems are primarily designed for detection of obstacles and traffic participants, then detection performance is optimized, but communication capability is insufficient and requires huge technical effort to add
Solution Approach 1:
The patent applies multi-functionality by enabling the radar system to perform both detection and communication functions using the same hardware infrastructure. The radar waves are modulated with communication symbols while maintaining detection capability, allowing a single system to serve dual purposes without requiring separate communication equipment
Solution Approach 2:
The patent combines detection and communication functions into a unified radar system. The communication information is embedded within the radar waveform itself through orthogonal modulation, merging what would traditionally be separate systems into one integrated platform that transmits both detection signals and communication data simultaneously
2Productivity
If communication information is embedded in the center of spectrum with radar side bands, then communication and radar share bandwidth, but target range estimation is affected and the system loses targets outside certain angular space
Solution Approach 1:
The patent segments the spectrum into distinct orthogonal regions: detection sequences occupy specific angular spaces while communication sequences operate in orthogonal dimensions. This segmentation allows both functions to coexist without interfering with each other, maintaining target detection reliability across the full angular range while enabling communication
Solution Approach 2:
The patent transitions from sharing the same spectral dimension to utilizing orthogonal dimensions for communication. By employing orthogonal modulation where communication sequences are orthogonal to detection sequences, the system adds a new dimension for communication that doesn't compromise detection performance or target tracking outside original angular spaces
3Adaptability or versatility
If orthogonal phase modulation is applied to PMCW radar waves, then communication is enabled without disturbing detection sequences, but system complexity increases
Solution Approach 1:
The patent changes the phase parameter of the radar waveform to embed communication information. By applying orthogonal phase modulation where different phase states represent communication symbols, the system enables communication capability while maintaining the underlying detection function through the orthogonal relationship between detection and communication sequences
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
Enables efficient and robust radar detection and communication with reduced hardware effort, maintaining target detection even when targets move outside the initial angular space, by utilizing orthogonal modulation and demodulation techniques in PMCW radar systems.
Implementation Method 1
selecting an equidistant bi-phased or multi-phased phase-modulation sequence, wherein members of the sequence are given by complex roots of unity, phase-modulating the continuous radar wave of the radar system
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A method of orthogonal modulation of radar waves of a phase-modulated continuous wave radar system (10) by a sequence of numerical communication symbols. The method comprises steps of selecting (34) an equidistant bi-phased or multi-phased phase-modulation sequence, phase-modulating (46) the continuous radar wave of the radar system (10), and transmitting (48) the orthogonal phase-modulated continuous radar wave towards a scene. The method is characterized by the steps of generating (36) a detection sequence (s) by applying an outer coding (H) to the phase-modulation sequence, selecting (38) a communication range (C) in the complex number plane, based on the selected phase-modulation, generating (40) a communication sequence (c) comprising a plurality of sequence members, mapping (42) the communication sequence (c) into the communication range (C) by applying an injective mapping function (Γ) to the members of the communication sequence (c), and calculating (44) a numerical product of members of the detection sequence (s) with members of an image of the mapped communication sequence (c). The step of phase-modulating (46) the continuous wave of the radar system (10) is carried out according to the calculated numerical products.