Radar Antenna Timing Symmetry for Phase Correction Elimination
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Solution Overview
Problem
Time-division multiplexing MIMO radar systems require phase corrections due to switching among transmitting antennas, leading to increased computational complexity and processing overhead.
Innovation Solution
A radar apparatus that allocates transmitting antennas in a determined order within a period, ensuring identical time differences for transmission start timings, eliminating the need for phase corrections and reducing computational requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phase correction processing is performed to compensate for timing differences in time-division multiplexing MIMO radar, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent changes the timing parameter of radar signal transmission by allocating an even number of transmission occasions to each transmitting antenna within a determination period, with transmission start timings symmetrically positioned around a reference timing. This parameter change eliminates the need for phase correction processing while maintaining direction of arrival estimation precision.
Solution Approach 2:
Instead of transmitting radar signals sequentially from each transmitting antenna (conventional approach), the patent inverts the approach by having each transmitting antenna transmit multiple times with symmetric timing around a reference point. This inversion eliminates the phase differences that would otherwise require correction processing.
2Measurement precision
If conventional time-division multiplexing MIMO radar transmits signals from multiple transmitting antennas, then angular resolution is improved, but computational load increases due to phase correction requirements
Solution Approach 1:
The patent modifies the transmission timing parameters by allocating an even number of transmission occasions to each transmitting antenna, with start timings positioned at identical time differences (symmetrically) from a reference timing. This parameter modification enables angular resolution improvement through multiple transmitting antennas while eliminating the computational burden of phase correction.
3Adaptability or versatility
If radar signals are transmitted with different timing from multiple transmitting antennas, then signal multiplexing is achieved, but processing overhead increases
Solution Approach 1:
The patent inverts the conventional sequential transmission approach by having each transmitting antenna transmit multiple times with symmetric timing around a reference point. This inversion achieves signal multiplexing from multiple transmitting antennas while eliminating the need for complex phase correction processing, thereby reducing processing overhead.
Data Source
AI summary
A radar apparatus includes: a radar transmission signal generator, which in operation, outputs a plurality of radar signals; a switching controller, which in operation, switches among plurality of transmitting antennas in sequence in a determined order to every one radar signal transmission period; and a radio transmitter, which in operation, transmits one radar signal every one radar signal transmission period through a allocated transmitting antenna to which switching has been made. A plurality of transmission timings at which the allocated transmitting antennas to which switching have been made transmit each of the plurality of radar signals within a determined period have identical time differences from a reference timing within the determined period.