Co-located Radar Detector for High Duty Factor Radio Transceivers
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Solution Overview
Problem
Frame-based FDD radio systems face challenges in radar detection due to high transmit duty factors, which interfere with receive signals and limit the ability of co-located radar detectors to detect radar signals, leading to potential outages and compliance issues with regulatory requirements.
Innovation Solution
Implementing a wireless communications system with a radar detector co-located with the receiver, using directional antennas for transmission and omnidirectional antennas for radar detection, and employing separate channels for radar detection to mitigate interference and enable 100% duty factor detection, allowing for peak-detection capabilities and efficient radar signal identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radar detector is co-located with transmitter, then radar detection capability is improved, but transmitter signal interferes with radar detection
Solution Approach 1:
The patent segments the transceiver into separate transmitter and receiver components, with the radar detector co-located with the receiver rather than the transmitter. This spatial segmentation allows the radar detector to operate on receive channels where it can detect radar signals without being overwhelmed by the high-power transmit signal on transmit channels.
Solution Approach 2:
The patent introduces an intermediary approach where the radar detector monitors receive channels that are frequency-separated from transmit channels. The receiver acts as an intermediary that can passively detect radar signals without direct exposure to the full power of the transmit signal, enabling radar detection while maintaining transmit functionality.
2Productivity
If transmit duty factor is increased to 100%, then productivity is improved, but radar detection capability deteriorates
Solution Approach 1:
The patent implements periodic radar detection on receive channels that occur independently of the transmit duty cycle. Since receive channels operate periodically even when transmit duty factor is 100%, radar detection can occur during these periodic receive intervals without reducing overall transmit productivity.
Solution Approach 2:
The patent moves radar detection from the transmit channel dimension to the receive channel dimension. By detecting radar on separate receive channels rather than on transmit channels, the system enables 100% transmit duty factor while maintaining radar detection capability through frequency-domain separation.
3Use of energy by moving object
If directional antennas are used for transmission, then power efficiency is improved, but radar detection coverage is reduced
Solution Approach 1:
The patent applies different antenna characteristics to different functions: directional antennas are used for transmit to concentrate power in specific directions, while omnidirectional or less directive antennas are used for radar detection to maximize coverage. This local quality differentiation allows each function to optimize its performance characteristics.
Solution Approach 2:
The patent makes the antenna system multi-functional by using different antenna types for different purposes within the same transceiver system. The transmit antenna provides directional power efficiency, while the detection antenna provides omnidirectional radar coverage, allowing the system to achieve both goals simultaneously through functional differentiation.
Data Source
AI summary
A radar detector is used with a radio link, the radio link characterized by high duty factor operation of a radio transmitter. The radar detector is located a sufficient distance from the radio transmitter that the radar detector is not overwhelmed by the radio transmission signal in that channel and can detect sufficiently low level radar signals to ascertain potential radio interference at the radar from said radio transmitter. The results of the radar detection are communicated to the transmitter in a way that impacts the transmitter's use of the sensed channel. This communication can occur reactively when a radar detection is achieved (the absence of which indicates no radar has been detected) and/or can be a periodic or event-driven indication that the channel is available for operation (the information expiring if the result is not refreshed).