Ground Control Point Device for SAR Displacement Measurement
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Solution Overview
Problem
In SAR displacement measuring systems, manually identifying ground control points from large quantities of SAR reflected wave data is time-consuming and prone to errors due to mixed observation and identifier information, and identifier information is susceptible to noise during transmission.
Innovation Solution
A ground control point device equipped with an SAR wave reflector, GNSS receiver, and control point data generator/transmitter that generates and transmits control point data with time-stamped positional information, allowing for automatic identification and separation from SAR observation data, reducing noise interference and manual processing needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual identification of ground control points is performed from SAR reflected wave data, then identification can be conducted, but it takes a lot of time and effort due to the enormous quantity of image data
Solution Approach 1:
The ground control point device automatically transmits its own identifier information to the SAR satellite without requiring manual identification or external assistance. The device uses its built-in identifier information transmission unit to self-identify, eliminating the time-consuming manual process of searching through enormous quantities of SAR image data to locate and identify ground control points.
2Productivity
If identifier information is transmitted from ground control point device to SAR satellite, then automatic identification is enabled, but the identifier information may be affected by noise during transmission
Solution Approach 1:
The ground control point device uses its position information acquisition unit to obtain precise position information and transmits this along with identifier information. The SAR satellite receives both the identifier and position data, allowing the ground station to verify and cross-check the transmitted information against known ground control point locations, thereby detecting and correcting potential noise-induced errors in the identifier transmission.
Solution Approach 2:
The patent introduces position information as an intermediary element that mediates between the identifier information transmission and the final identification process. By transmitting both identifier information and position information separately, the system creates a verification mechanism where the position data serves as a reference to confirm the accuracy of the identifier information received from the ground control point device.
3Device complexity
If observation information and identifier information are mixed in reflected wave data, then data transmission is simplified, but separation and extraction processing is required prior to SAR analysis
Solution Approach 1:
The ground control point device segments the transmitted information into distinct components: identifier information and position information. These segmented information elements are transmitted separately through different communication channels or data streams, allowing the ground station to receive and process them independently without requiring complex separation and extraction processing, thereby improving data processing efficiency while maintaining transmission simplicity.
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
Enables efficient and accurate identification of ground control points, reducing manual processing time and noise effects, facilitating precise SAR analysis by direct transmission of control point data to geodetic information processing devices without mixing with observation data.
Implementation Method 1
an SAR wave reflector configured to receive an SAR wave incident from an SAR in an incident direction and to reflect the SAR wave in the incident direction
Implementation Method 2
a global navigation satellite system (GNSS) receiver configured to receive a GNSS wave to generate, based on the GNSS wave, time information and positional information
Data Source
AI summary
A ground control point device includes an SAR wave reflector configured to receive an SAR wave incident from an SAR in an incident direction and to reflect the SAR wave in the incident direction; a GNSS receiver configured to receive a GNSS wave to generate, based on the GNSS wave, time information and positional information indicative of a position of a control point; an SAR wave receiver configured to receive the SAR wave; and a control point data generator/transmitter configured to generate control point data obtained by associating the positional information when the SAR receiver receives the SAR wave with a time instant of reception of the SAR wave that is determined based on the time information, and to transmit the control point data to outside.