OFDM Radar Gain Control for Near Far Range Detection
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Solution Overview
Problem
Conventional radar systems face challenges in effectively managing gain control, particularly in Orthogonal Frequency Division Multiplexed (OFDM) systems, which affects their ability to accurately detect and differentiate objects in complex scenes.
Innovation Solution
The implementation of a phased array radar system with integrated gain control mechanisms, utilizing a transceiver system on chip (SoC) and advanced signal processing techniques, such as beamforming and OFDM frame structures, to optimize transmit power and receive gain across different ranges and directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional radar systems use fixed gain control, then the system structure is simple, but the ability to accurately detect and differentiate objects in complex scenes deteriorates
Solution Approach 1:
The patent implements dynamic gain control where the receiver gain is adjusted based on the detected scene characteristics. The system iteratively improves channel estimates and adjusts beamforming coefficients to adapt to different ranges and directions, transforming the static gain control into a dynamic parameter that changes with operating conditions to maintain detection accuracy across complex scenes
Solution Approach 2:
The system changes the receiver gain parameter based on the detected signal characteristics and range. By iteratively improving channel estimates and adjusting beamforming coefficients, the system modifies the gain parameter to optimize object detection accuracy for different scene complexities, distances, and directions
2Measurement precision
If the radar system increases transmit power for far range detection, then the detection range is improved, but the interference and noise in near range deteriorates
Solution Approach 1:
The patent divides the detection scene into near range and far range segments with different processing strategies. The system applies different beamforming coefficients and gain control parameters for different range segments, allowing optimized detection for each zone while minimizing interference between them through spatial segmentation of the detection environment
Solution Approach 2:
The system applies different quality settings locally to different range zones. For far range detection, higher transmit power and gain are applied, while for near range, the system uses adjusted beamforming coefficients to reduce interference. This local optimization of parameters ensures far range detection capability without degrading near range performance
3Measurement precision
If the radar system uses high receiver gain for weak signal detection, then the sensitivity is improved, but the susceptibility to noise and interference deteriorates
Solution Approach 1:
The patent implements iterative feedback where the system continuously improves channel estimates based on received signals and uses this feedback to adjust beamforming coefficients and receiver gain. This closed-loop approach allows the system to optimize sensitivity while monitoring and compensating for noise and interference effects in real-time
Solution Approach 2:
The system performs preliminary channel estimation and beamforming coefficient optimization before final signal detection. By pre-processing the signals with improved channel estimates and optimized beamforming, the system prepares the reception chain to maximize sensitivity while minimizing noise susceptibility for the subsequent detection phase
Data Source
AI summary
A radar system comprises a transmitter and a receiver. The radar system is operable to define a near range and a far range. The radar system is operable to, during each one of a plurality of time intervals, repeatedly transmit, via the transmitter, a plurality of OFDM symbols. The transmitter is operable to select a transmit power for the transmission during the one of the time intervals based on from which of the near range and the far range reflections of the OFDM symbols are to be received during the one of the time intervals. The receiver is operable to receive reflections of the OFDM symbols, and process, in the receiver, the reflections of the OFDM symbols to detect objects within the near range and the far range.