Radar Antenna Doppler Multiplexing for Higher Angular Resolution
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Solution Overview
Problem
Existing radar systems face challenges in enhancing sensing accuracy and angular resolution due to limitations in the number of transmission antennas, particularly in MIMO radar configurations, which restrict the extraction of propagation path responses beyond a certain threshold.
Innovation Solution
A radar apparatus employing Doppler multiplexing transmission, where each transmission antenna is associated with a unique combination of Doppler shift amount and code sequence, allowing for the simultaneous use of more virtual reception antennas to improve sensing accuracy and angular resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of transmission antennas is increased to improve sensing accuracy and angular resolution, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The patent applies parameter changes by assigning different Doppler shift amounts and code sequences to each transmission antenna. This allows the system to differentiate between signals from multiple antennas without requiring physically distinct antenna configurations, thereby improving angular resolution while managing device complexity through signal parameter differentiation rather than hardware proliferation
Solution Approach 2:
The patent introduces Doppler shift amounts and code sequences as intermediary elements that mediate between the transmission antennas and the received signals. These intermediaries enable the system to extract propagation path responses from multiple antennas by encoding unique identifiers in the signal parameters, allowing virtual reception antenna multiplication without proportionally increasing physical antenna count
2Productivity
If Doppler multiplexing transmission is used to extract more propagation path responses, then the productivity is improved, but the device complexity increases
Solution Approach 1:
The patent employs periodic action through the use of code sequences assigned to different transmission antennas. These code sequences enable the receiver to periodically identify and separate propagation path responses corresponding to different antennas, increasing the number of extractable propagation paths while managing processing complexity through structured, repeating patterns
Solution Approach 2:
The patent applies dynamics by introducing Doppler shift amounts that create dynamic frequency separation between signals from different transmission antennas. This dynamic parameter allows the system to continuously differentiate and extract multiple propagation path responses through frequency-domain processing, improving productivity while the Doppler-based separation simplifies the overall processing architecture
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed method enables the extraction of more propagation path responses, enhancing the radar's angular measurement performance and target-object sensing accuracy by effectively utilizing a greater number of transmission antennas.
Implementation Method 1
a transmission circuit that applies a phase rotation amount corresponding to a Doppler shift amount and a code sequence to the transmission signal to perform multiplexing transmission of the transmission signal from the plurality of transmission antennas
Data Source
AI summary
A radar transmitter includes: a plurality of transmission antennas that transmit a transmission signal; and a transmission circuit that applies a phase rotation amount corresponding to a Doppler shift amount and a code sequence to the transmission signal to perform multiplexing transmission of the transmission signal from the plurality of transmission antennas. Each of the plurality of transmission antennas is associated with each of a plurality of combinations of the Doppler shift amount and the code sequence. Each of the plurality of combination is different at least one of the Doppler shift amount and the code sequence, and the Doppler shift amounts of those of the plurality of combinations which are associated respectively with at least two transmission antennas of the plurality of transmission antennas are the same Doppler shift amount, the at least two transmission antennas being a first sub-array antenna.