Radar Device Virtual Sub-Array Space Averaging
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Solution Overview
Problem
Existing radar devices using holographic synthesizing techniques struggle to precisely detect moving targets due to phase shifts and unnecessary peak calculations, resulting in a reduced target detection count and accuracy.
Innovation Solution
A radar device employing a virtual space averaging process with an antenna switchover technique, where the reception antenna group functions as virtual sub-arrays, allowing for simultaneous target detection without physical movement, thereby maintaining high detection accuracy and count even when targets move.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If holographic synthesizing technique is used to improve target detection count, then the number of detectable targets increases, but phase shifts occur when targets move during antenna switching, reducing detection accuracy
Solution Approach 1:
The patent applies preliminary action by performing space averaging processing on correlation values before holographic synthesizing. The system calculates correlation values between transmission and reception waves, performs space averaging to suppress interference, and then conducts holographic synthesizing on the processed correlation values. This preliminary processing ensures that even when targets move during antenna switching, the detection accuracy is maintained while still achieving high target detection count.
Solution Approach 2:
The patent replaces the mechanical antenna switching process with a signal processing approach. Instead of relying solely on physical antenna switching and sequential reception, the system uses space averaging processing to synthetically create multiple reception positions. This substitution of mechanical switching with signal processing eliminates the phase shift problem caused by target movement during the switching process, while still enabling high target detection count through virtual antenna synthesis.
2Device complexity
If sequential transmission waves are transmitted while switching transmission antennas for holographic synthesizing, then reception results of multiple virtual antennas are obtained, but targets may move during switching causing phase shifts and unnecessary peak calculations
Solution Approach 1:
The patent performs space averaging processing as a preliminary step before holographic synthesizing. By calculating correlation values and performing space averaging on these correlation values first, the system suppresses interference waves and maintains phase consistency. This preliminary action ensures that subsequent holographic synthesizing operates on already-processed data, eliminating the reliability issues caused by target movement during antenna switching.
3Measurement precision
If space averaging process is applied to restrain interference wave influence, then detection accuracy improves, but the process requires shifting reception positions which reduces target detection count
Solution Approach 1:
The patent replaces the mechanical approach of physically shifting reception positions with a signal processing approach. Instead of moving antennas to perform space averaging, the system calculates correlation values between transmission and reception waves and performs space averaging on these correlation values in the signal domain. This substitution maintains detection accuracy while preserving the full target detection count capability of the virtual antenna synthesis.
Data Source
AI summary
In a radar device including: a transmission antenna group having a plurality of transmission antennas; a reception antenna group having a plurality of reception antennas; and transmission switchover means to transmit transmission waves in a way that sequentially switches over the transmission antennas of the transmission antenna group, the reception antenna group receiving reflected waves, reflected from a target, of transmission waves of the transmission antennas when sequentially transmitting the transmission waves, is made to function as a virtual sub-array corresponding to the transmission antennas. The target is thus detected by executing a space averaging process based on a relative position, to the reception antenna group, of each of the transmission antennas undergoing the transmission switchover with respect to the virtual correlation values corresponding to the plurality of virtual sub-arrays.