Weighted Polarization Signal Processing for Mobile Satellite Reception
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Solution Overview
Problem
Conventional signal processing devices for receiving satellite signals exhibit insufficient performance due to polarization changes caused by the positional relationship between satellites and mobile bodies, leading to deterioration in reception quality, especially in high-speed aircraft.
Innovation Solution
A signal processing device that utilizes a first and second transmission path estimator to calculate weights for vertical and horizontal signals, applying weighted summation to improve reception performance by reducing synchronization deviations and interference, even when polarization changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional signal processing is used to receive satellite signals, then the device structure is simple, but the reception quality deteriorates due to polarization changes
Solution Approach 1:
The patent implements dynamic signal processing by continuously estimating transmission path characteristics and calculating optimal weights in real-time based on changing polarization conditions. The weight calculation unit dynamically adjusts the weights for vertical and horizontal signals according to the estimated transmission path characteristics, allowing the system to adapt to time-varying polarization changes caused by aircraft movement and satellite relative position.
Solution Approach 2:
The patent changes the parameter of signal weights to optimize reception quality. By calculating optimal weights based on transmission path characteristics and applying weighted summation to vertical and horizontal signals, the system transforms the fixed signal processing approach into a variable parameter approach where weights are continuously adjusted to compensate for polarization changes.
2Measurement precision
If weighted summation is applied to vertical and horizontal signals, then signal-to-noise ratio improves, but calculation complexity increases
Solution Approach 1:
The patent performs preliminary estimation of transmission path characteristics before calculating the optimal weights. The transmission path characteristic estimation unit预先 estimates the characteristics based on received signals, and this preliminary information is then used by the weight calculation unit to determine the optimal weights for signal combination, reducing the overall computational burden.
Solution Approach 2:
The patent replaces complex mechanical polarization adjustment mechanisms with signal processing calculations. Instead of physically adjusting antenna polarization to track the satellite, the system uses transmission path characteristic estimation and weight calculation to achieve the same effect through digital signal processing, substituting mechanical complexity with computational algorithms.
Data Source
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AI summary
Provided is a signal processing device that achieves improvement in performance. The signal processing device includes: a transmission path estimator (165V) that estimates a first transmission path characteristic of a transmission signal using a vertical signal out of vertical and horizontal signals resulting from being received by a vertical polarization antenna and a horizontal polarization antenna; a transmission path estimator (165H) that estimates a second transmission path characteristic of the transmission signal using the horizontal signal; a weight calculator (170) that calculates a first weight for the vertical signal and a second weight for the horizontal signal, using the first transmission path characteristic and the second transmission path characteristic; and a weighting applier (175) that applies weighted summation to the vertical signal and the horizontal signal using the first weight and the second weight.