Multi-Static SAR Receiver Clusters for Single-Pass 3D Reconstruction
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Solution Overview
Problem
Current 3D mapping and scene reconstruction technologies face challenges in efficiently and cost-effectively capturing detailed three-dimensional models of vast areas, particularly in areas with restricted access, due to the need for multiple passes and the high cost of high-resolution satellites.
Innovation Solution
A system comprising a cluster of bistatic or multi-static SAR receiver satellites flying in formation with a main transmitter satellite, capable of collecting and processing SAR data in a single pass to generate accurate 3D models of landscapes and structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-resolution electro-optical satellites are used for 3D mapping, then measurement precision is improved, but loss of time increases due to repeating pass orbits consuming multiple days
Solution Approach 1:
The system segments the satellite constellation into one active transmitter satellite and multiple passive receiver satellites. This segmentation allows parallel data collection from multiple receivers simultaneously, reducing acquisition time while maintaining high measurement precision through multi-angle observations.
Solution Approach 2:
The invention transitions from traditional single-satellite or bistatic configurations to a multi-static cluster arrangement, adding spatial dimensionality to the observation system. Multiple receivers positioned at different locations and angles provide simultaneous multi-perspective data, enabling rapid 3D reconstruction without requiring repeated passes.
2Loss of time
If high-resolution satellites are deployed to overcome time delay, then measurement precision is improved, but device complexity and cost increase creating a barrier to launching sufficient constellation size
Solution Approach 1:
The receiver satellites are designed with multi-functionality, serving as both communication nodes and SAR data collectors. Each receiver satellite can receive and process radar signals from the transmitter while maintaining its own orbital position, reducing the need for specialized high-cost instruments on each platform.
Solution Approach 2:
The system employs multiple lower-cost receiver satellites instead of fewer expensive high-resolution satellites. These receivers can be smaller, simpler, and more economical to deploy in larger numbers, forming a cost-effective constellation that achieves rapid 3D mapping through parallel operations.
3Measurement precision
If traditional SAR bistatic collections are used, then measurement precision is improved, but loss of time increases requiring almost a month of collection time
Solution Approach 1:
The multi-static cluster enables continuous useful action by having multiple receivers simultaneously collecting data throughout their orbital pass. Rather than sequential bistatic measurements, all receivers operate in parallel continuously, capturing complete 3D information in a single pass without interruption or repeated orbits.
Solution Approach 2:
The receiver satellites are pre-positioned in their orbital formation before the transmitter satellite begins its illumination pass. This preliminary positioning ensures that all receivers are in optimal locations to capture reflected signals simultaneously, eliminating the need for time-consuming orbital adjustments during data collection.
4Measurement precision
If electro-optical photogrammetry is used to map three-dimensional structures, then measurement precision is improved, but device complexity increases requiring large stacks of images at various look angles
Solution Approach 1:
The system replaces complex electro-optical image acquisition and processing mechanics with radar-based electromagnetic wave reflection measurement. Instead of capturing and processing large stacks of optical images from multiple angles, the SAR system directly measures distance and position through radio wave time-of-flight and phase information, simplifying the overall measurement system.
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 rapid and cost-effective 3D scene reconstruction over large areas in a single pass, overcoming the limitations of traditional methods by utilizing a cluster of low-cost receive-only SAR satellites.
Implementation Method 1
a main satellite comprising a synthetic aperture radar (SAR) configured to transmit at least a radio frequency pulse to illuminate an imaging target
Implementation Method 2
receive, from two or more additional satellites configured to fly in-formation with respect to at least the main satellite, an echo of the radio frequency pulse
Data Source
AI summary
Various embodiments of the present technology relate to synthetic aperture radar image capturing and scene reconstruction using a cluster of multi-static satellite receivers. More specifically, in some embodiments, the cluster of receivers retrieves a flight path over a communication network. Flying in-formation, a lead or main satellite sends radio or wave pulses to a target area and additional satellites capture an echo of the wave pulses after the waves bounce off the target area to capture SAR radar data. The radar data can be transmitted from the cluster of satellites to a radar stations or to the main satellite. The radar stations or the main satellite receive the SAR radar data and mapping to reconstruct the data as SAR image data that can be reconstructed as 2D or 3D landscapes and scenes using the SAR image data.