Multi-Antenna Radar Multiplexing for Range and Doppler Detection
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Solution Overview
Problem
Existing radar systems face challenges in achieving enhanced target detection accuracy, particularly in combining long-range and short-range modes, which can lead to extended processing times, reduced maximum Doppler frequency detectability, and increased hardware costs.
Innovation Solution
A radar apparatus employing code-multiplexing and Doppler multiplexing of transmission signals from multiple antennas, allowing simultaneous detection in different distance ranges without requiring high-speed AD converters, thereby enhancing distance resolution and Doppler component detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If code-multiplexing and Doppler multiplexing are used to enable simultaneous detection in different distance ranges, then target detection accuracy is improved, but processing time increases
Solution Approach 1:
The patent segments the detection process by using multiple transmission signals with different modulation frequencies that are code-multiplexed. Each signal targets a specific distance range, allowing the radar to process different ranges simultaneously rather than sequentially, thereby improving detection accuracy without proportionally increasing processing time
Solution Approach 2:
The patent introduces Doppler multiplexing as an additional dimension for signal differentiation. By utilizing both code division and Doppler frequency division, the system creates a multi-dimensional signal space that enables simultaneous processing of multiple distance ranges while maintaining efficient processing through orthogonal signal structures
2Measurement precision
If multiple transmission signals with different modulation frequencies are used for simultaneous detection, then distance resolution is enhanced, but device complexity increases
Solution Approach 1:
The patent changes the modulation frequency parameter of transmission signals to differentiate between different distance ranges. By assigning specific modulation frequencies to different ranges and using code-multiplexing, the system achieves enhanced distance resolution while managing complexity through systematic parameter assignment rather than requiring fundamentally different processing architectures
Solution Approach 2:
The patent creates a universal signal processing framework that handles multiple distance ranges using the same hardware infrastructure. The code-multiplexed signals with different modulation frequencies are processed through a unified reception and processing chain, reducing device complexity compared to having separate systems for each distance range
3Area of stationary object
If conventional radar methods are used for wide-angle detection, then detection range is expanded, but maximum Doppler frequency detectability is reduced
Solution Approach 1:
The patent uses periodic modulation patterns in the code-multiplexed signals that are synchronized with the radar's transmission cycle. This periodic structure allows the receiver to distinguish between signals from different distance ranges while maintaining the ability to detect high Doppler frequencies through coherent integration over multiple periods, thus preserving Doppler detectability in wide-angle mode
Data Source
AI summary
A radar apparatus includes signal generation circuitry, which, in operation, generates a plurality of transmission signals transmitted at different transmission start timings, and transmission circuitry, which, in operation, applies different phase rotations to a first transmission signal and a second transmission signal among the plurality of transmission signals and transmits the first transmission signal and the second transmission signal from different transmission antennas using code multiplexing transmission or Doppler multiplexing transmission. A part of the first transmission signal and a part of the second transmission signal are transmitted in a first period. A modulation frequency of the first transmission signal at a first timing included in the first period differs from a modulation frequency of the second transmission signal at the first timing.