Virtual Antenna Radar Compensation for Phase and Amplitude Errors
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Solution Overview
Problem
Existing radar devices face limitations in compensation accuracy due to factors beyond phase differences between receiver circuits, necessitating improvements in error compensation processing.
Innovation Solution
A radar device with transmission and reception antennas arranged at equal distances, utilizing a controller to perform compensation processes for phase and amplitude differences between transmission and receiver circuits based on virtual antenna combinations, ensuring accurate signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phase compensation is performed only between receiver circuits, then the compensation process is simple, but compensation accuracy is insufficient because it does not address errors in transmission circuits
Solution Approach 1:
The compensation process is segmented into two distinct stages: first compensating for phase differences between transmission circuits using transmission signals, then compensating for phase differences between receiver circuits using received signals. This segmentation allows each compensation stage to focus on specific error sources, improving overall accuracy without requiring complete redesign of the compensation system.
Solution Approach 2:
The transmission circuit phase compensation is performed as a preliminary action before receiver circuit phase compensation. By pre-compensating transmission circuit errors using transmission signals, the subsequent receiver circuit compensation operates on already-corrected signals, achieving higher overall accuracy while maintaining a structured two-stage process.
2Measurement precision
If multiple virtual antenna combinations are used for compensation, then compensation accuracy improves, but the number of processing combinations increases complexity
Solution Approach 1:
The invention extracts and utilizes existing transmission signals and received signals for separate compensation processes. By taking out transmission signals to compensate transmission circuits and using received signals to compensate receiver circuits, the system achieves accurate compensation without requiring additional signal paths or complex virtual antenna combinations.
Solution Approach 2:
The invention creates virtual antennas through signal processing copies of the physical antenna system. By generating virtual antenna representations from transmission and received signals, the system achieves multiple compensation perspectives without physically adding more antennas, thus improving accuracy while avoiding proportional increases in hardware complexity.
3Measurement precision
If transmission and reception antennas are arranged at equal distances, then angle measurement precision improves, but the antenna arrangement constraints increase design complexity
Solution Approach 1:
The invention specifies equal distance as an optimal parameter for antenna arrangement to maximize angle measurement precision. By establishing this clear geometric parameter requirement, the system achieves high measurement accuracy while providing manufacturers with a straightforward design guideline, balancing precision requirements with manufacturing ease.
Data Source
AI summary
A radar device includes transmission antennas and reception antennas arranged at equal distances. Transmission circuits are connected to the transmission antennas to output transmitted signals, while receiver circuits are connected to the reception antennas to acquire received signals. A controller processes these received signals. The device uses at least two transmission antennas (Ns) and at least two reception antennas (Nr), arranged to provide at least Ns+Nr−2 first combinations of transmission and reception circuits. Virtual antennas are assumed for each transmission antenna based on phase differences of the received signals. The controller extracts and determines unique combinations of virtual antennas, transmission circuits, and receiver circuits. It performs compensation for phase and amplitude differences between different transmission and receiver circuits, based on the comparison of received signals among the virtual antennas in the first combinations.