Satellite Radiowave Receiver Error Range Calculation
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Solution Overview
Problem
Satellite radiowave receiving devices face accuracy issues due to biased satellite distribution, reflection by high-rise buildings, and reduced reception strength caused by ionosphere and atmosphere, leading to unreliable positioning information.
Innovation Solution
A satellite radiowave receiving device that calculates an error range based on positioning accuracy and deviation, combining the positions of multiple satellites and their receiving states, using signal-to-noise ratio and traveling state to determine the accuracy of the current position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If positioning operations are performed using radiowaves from multiple positioning satellites, then positioning coverage is improved, but positioning accuracy deteriorates due to biased satellite distribution, reflection by high-rise buildings, and reduced reception strength
Solution Approach 1:
The patent segments the positioning accuracy evaluation into two independent components: (1) geometric accuracy based on satellite distribution evaluated by DOP values, and (2) reception quality accuracy based on signal strength from each satellite. This segmentation allows the system to identify which component is causing the accuracy degradation and apply appropriate corrective measures, thereby maintaining overall positioning accuracy even when using multiple satellites in challenging environments.
Solution Approach 2:
The patent changes the evaluation parameters from a single integrated accuracy metric to multiple independent parameters: DOP values for geometric distribution and signal-to-noise ratio for reception quality. By monitoring these separate parameters, the system can detect degradation sources and adjust positioning operations accordingly, resolving the contradiction between using multiple satellites for coverage while maintaining accuracy.
2Measurement precision
If positioning accuracy is evaluated based on DOP values and satellite arrangement, then geometric positioning quality is assessed, but actual positioning accuracy cannot be determined due to unaccounted reception strength variations and propagation delays
Solution Approach 1:
The patent merges two previously separate evaluation systems into a unified accuracy assessment: (1) geometric evaluation using DOP values and satellite arrangement, and (2) reception quality evaluation using signal-to-noise ratio and propagation delay from each satellite. By combining these evaluations, the system produces a comprehensive accuracy metric that reflects both geometric quality and signal quality, thereby determining reliable overall positioning accuracy.
Solution Approach 2:
The patent implements feedback by continuously monitoring both DOP values and signal-to-noise ratio from each satellite, then using this combined information to adjust positioning operations. The system feeds back the actual reception quality information to the positioning algorithm, allowing real-time compensation for signal degradation caused by ionosphere, atmosphere, or buildings, thus ensuring reliable accuracy assessment.
3Quantity of substance
If radiowaves are received from positioning satellites in biased distribution or after reflection, then satellite signal availability is improved, but positioning accuracy deteriorates
Solution Approach 1:
The patent applies dynamics by making the positioning algorithm adaptive to changing signal conditions. The system dynamically evaluates the quality of each received satellite signal using signal-to-noise ratio and propagation delay, then dynamically adjusts the weighting or selection of satellites used for positioning calculation. This dynamic adaptation allows the system to utilize available signals from reflected or biased satellites while compensating for their degraded quality, maintaining positioning accuracy despite reduced signal availability quality.
Data Source
AI summary
A satellite radiowave receiving device includes a receiver and a processor. The receiver receives radiowaves from a positioning satellite. The processor performs a positioning operation based on the radiowaves received by the receiver to obtain a current position. The processor calculates an error range at the current position based on a positioning accuracy and a deviation. The positioning accuracy is obtained by combining each position of a plurality of positioning satellites and receiving state of radiowaves from each of the plurality of positioning satellites, and the deviation is a deviation of the current position and a predicted position calculated in accordance with a travelling state of the satellite radiowave receiving device.