Rotating Antenna Motion Compensation for Stationary Radio Positioning
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Solution Overview
Problem
Existing positioning systems struggle to perform motion compensation when the positioning device is stationary or when there is little motion between the device and the reference source, limiting their ability to accurately receive signals from a wider range of angles.
Innovation Solution
Incorporating a turntable mechanism within the positioning device that rotates the antenna to generate motion along the line of sight to the reference source, allowing for motion compensation even when there is no relative motion between the device and the source, thereby enhancing signal reception from various angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If motion compensation is performed using conventional techniques, then positioning accuracy is improved for moving devices, but the system fails to provide accurate positioning when the device is stationary or there is little motion
Solution Approach 1:
The patent applies the Dynamics principle by introducing a turntable mechanism that creates artificial motion of the antenna relative to the platform. This allows the system to generate the necessary Doppler shifts and signal variations required for motion compensation techniques to work effectively, even when the overall platform is stationary. The turntable dynamically adjusts the antenna's position to simulate motion conditions.
Solution Approach 2:
The turntable acts as an intermediary mechanism between the stationary platform and the signal processing system. It introduces controlled motion that enables motion compensation algorithms to function by creating relative movement between the antenna and incoming signals, thereby bridging the gap between stationary operation and motion-dependent positioning techniques.
2Adaptability or versatility
If the antenna is fixed to the platform, then the device structure is simple, but the system cannot perform motion compensation for signals from a wider range of angles
Solution Approach 1:
The antenna mounting structure transitions from a static configuration to a dynamic one by incorporating a turntable mechanism. This allows the antenna to rotate and change its orientation relative to the platform, enabling reception of signals from a wider range of angles and facilitating motion compensation for multi-directional signals.
Solution Approach 2:
The turntable mechanism adds a rotational dimension to the antenna's positioning capability. Instead of being constrained to a fixed orientation on the platform, the antenna can now rotate around the vertical axis, accessing signals from different azimuth angles and enhancing the system's spatial coverage and adaptability.
3Measurement precision
If a turntable mechanism is added to enable motion compensation for stationary devices, then positioning accuracy for stationary devices is improved, but device complexity increases
Solution Approach 1:
The turntable mechanism introduces controlled dynamic motion to enable motion compensation techniques to work for stationary devices. By rotating the antenna, the system generates the necessary signal variations and Doppler shifts that allow correlation-based positioning algorithms to achieve accurate positioning even when the overall device is stationary.
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
This approach enables the positioning system to effectively increase the gain of weak line-of-sight signals, improve positioning accuracy, and detect signals that would otherwise be attenuated by obstacles, such as buildings, by applying motion compensation across a broader range of angles.
Implementation Method 1
an antenna (102) configured to receive a signal from a remote source
Implementation Method 2
determine a motion of the antenna... motion compensating at least one of the local signal, the received signal, and the correlation signal based on the determined motion of the antenna
Data Source
AI summary
A system is disclosed and comprises a mobile platform, an antenna configured to receive a signal from a remote source in a first direction, a movement mechanism mounted to the platform, wherein the antenna is mounted to the movement mechanism, the movement mechanism being configured to move the antenna relative to the platform, and a controller configured to: generate a local signal, determine a component of motion of the antenna in the first direction, correlate the local signal with the received signal to provide a correlation signal, and motion compensating at least one of the local signal, the signal from the remote source, and the correlation signal based on the determined motion of the antenna in the first direction.