Radar Antenna Array Spacing to Suppress Grating Lobes
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Solution Overview
Problem
Radar devices with existing antenna configurations suffer from the occurrence of grating lobes during signal processing, which affects target detection accuracy.
Innovation Solution
The antenna device is designed with reception antennas arranged at regular intervals between transmission antennas, where the spacing between adjacent transmission antennas is calculated by adding an integral multiple of the reception antenna spacing to the divided reception antenna spacing, effectively suppressing grating lobes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reception antennas are arranged at regular intervals between transmission antennas with standard spacing, then the radar device can achieve good target detection performance, but grating lobes occur in the signal processing results
Solution Approach 1:
The patent changes the spacing parameter between transmission antennas from a standard uniform value to a specific calculated value defined by the formula. This parameter modification eliminates the periodicity that causes grating lobes while maintaining the regular interval arrangement of reception antennas, thus resolving the contradiction between detection performance and grating lobe suppression
Solution Approach 2:
The patent introduces asymmetry in the transmission antenna spacing relative to the reception antenna spacing. By making the transmission antenna spacing an irrational multiple of the reception antenna spacing, the system breaks the symmetric periodic structure that generates grating lobes, while preserving the overall array configuration for effective target detection
2Object-generated harmful factors
If the spacing between transmission antennas is reduced to suppress grating lobes, then grating lobe occurrence is reduced, but the unambiguous measurement range decreases
Solution Approach 1:
The patent optimizes the transmission antenna spacing parameter to a specific value that satisfies the grating lobe suppression condition while maximizing the unambiguous measurement range. The formula provides an optimal balance point that prevents excessive reduction of spacing, thereby maintaining a large measurement range while suppressing grating lobes
Solution Approach 2:
The patent enables dynamic adjustment of the transmission antenna spacing based on the reception antenna configuration. By calculating the optimal spacing using the provided formula that incorporates the reception antenna spacing and integer multiples, the system adaptively determines the transmission antenna spacing to simultaneously achieve grating lobe suppression and maximize measurement range
Data Source
AI summary
An antenna device is formed in such a manner that reception antennas are arranged at regular intervals between two transmission antennas adjacent to each other among transmission antennas, and a spacing between the transmission antenna and the transmission antenna has a width obtained by adding an integral multiple of a spacing dRx between each two of the reception antennas to a width obtained by dividing the spacing dRx by the number NTx of the transmission antennas.