Radar Signal Orthogonality via Phase Modulation
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Solution Overview
Problem
Existing radar systems face challenges in accurately determining object information such as distance, speed, and direction of targets due to ambiguities in signal processing, particularly when using multiple transmission and reception antennas.
Innovation Solution
The method employs three transmitters emitting frequency-modulated continuous wave signals with phase-encoded orthogonal signals, and multi-dimensional discrete Fourier transformations to improve signal orthogonality and ambiguity resolution, allowing for precise determination of target signals and object information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple transmission signals are transmitted simultaneously from multiple transmitters, then the productivity of the radar system is improved, but signal ambiguities increase making target differentiation difficult
Solution Approach 1:
The patent applies phase modulation to transmission signals, changing the phase parameter of each signal from multiple transmitters. By assigning different phase codes (e.g., 0°, 120°, 240°) to signals from different transmitters, the system maintains simultaneous transmission while enabling the receiver to differentiate between signals through phase correlation, thus resolving ambiguities without sacrificing processing speed
Solution Approach 2:
The system uses correlation processing at the receiver to provide feedback information about the phase relationships between received signals and transmitted reference signals. This feedback mechanism allows the system to resolve ambiguities by comparing expected phase patterns with actual received signals, enabling accurate target differentiation even when multiple signals are transmitted simultaneously
2Measurement precision
If phase modulation is applied to transmission signals to improve signal orthogonality, then measurement precision of target parameters is improved, but device complexity increases
Solution Approach 1:
The patent modifies the phase parameter of transmission signals using simple phase modulation schemes (e.g., 3-phase or 4-phase modulation). At the receiver, correlation processing with pre-stored reference phase codes enables accurate signal differentiation. This approach achieves high measurement precision through parameter encoding rather than through complex hardware structures
Solution Approach 2:
The patent replaces complex hardware-based signal differentiation mechanisms with software-based phase correlation processing. Instead of using complex antenna configurations or signal filtering hardware, the system uses digital signal processing to correlate received signals with reference phase patterns, reducing hardware complexity while maintaining high measurement precision
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 the accuracy and reliability of object information determination, enabling better tracking and differentiation of target signals, and improves the speed of data processing in radar systems.
Implementation Method 1
transmission signals are transmitted into a monitoring range of the radar system... echoes, which are reflected at the at least one target object, of the transmission signals are received as received signals
Implementation Method 2
the received signals are subjected to at least one discrete Fourier transformation, at least one target signal is determined from the result of the at least one Fourier transformation
Data Source
AI summary
A method for determining at least one object information item of at least one target object (18) which is sensed with a radar system (12) of a vehicle (10), a radar system (12) and a driver assistance system (12) are described. Transmission signals (32a, 32b, 32c) are transmitted into a monitoring range (14) of the radar system (12) with three transmitters (Tx1, Tx2, Tx3). Echoes, which are reflected at the at least one target object (18), of the transmission signals (32a, 32b, 32c) are received as received signals (34a, 34b, 32c) with at least two receivers (RxA, RxB, RxC, RxD). The received signals (34a, 34b, 34c) are subjected to at least one multi-dimensional discrete Fourier transformation. At least one target signal is determined from the result of the Fourier transformation. An object information item is determined from the target signal.