TDI Line Detector Submodule Segmentation for Stability
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Solution Overview
Problem
TDI line detectors face stability challenges due to jitter between pixels, limiting the number of lines and increasing complexity, especially with microvibrations in satellites, making it difficult to maintain stability for extended periods.
Innovation Solution
Dividing the TDI line detector into submodules with separate readout electronics for each last line and synchronizing them, allowing for reduced stability time by a factor of the number of submodules, and optionally positioning submodules laterally offset to enhance geometrical resolution and spectral capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lines in a TDI line detector is increased to improve resolution, then the geometrical resolution is improved, but the stability requirement becomes more stringent and the complexity increases
Solution Approach 1:
The TDI line detector is divided into multiple independent submodules, each with its own readout electronics. This segmentation allows each submodule to be stabilized independently for a shorter duration, reducing the overall stability requirement while maintaining high resolution capability through the combined output of multiple submodules.
2Measurement precision
If the number of lines is increased to improve resolution, then the geometrical resolution is improved, but the jitter between pixels increases making stability harder to maintain
Solution Approach 1:
By segmenting the detector into submodules with independent readout, the total line count is distributed across multiple stable units. Each submodule maintains pixel stability independently, and the combined data from all submodules achieves the desired resolution without requiring the entire detector to maintain stability simultaneously.
Solution Approach 2:
The segmented architecture enables periodic readout of data from different submodules, allowing each to be stabilized and read out in sequence rather than requiring simultaneous stabilization of all lines, thereby reducing overall jitter accumulation.
3Quantity of substance
If the stability time is extended to accommodate more lines, then more lines can be used, but the additional expense for readout electronics and postprocessing increases
Solution Approach 1:
The detector is divided into submodules with distributed readout electronics, where each submodule handles a portion of the total lines. This segmentation reduces the stability time requirement for each submodule, allowing more lines to be accommodated without proportionally increasing the complexity and cost of readout electronics and postprocessing systems.
Data Source
AI summary
The invention relates to a TDI line detector (1), comprising n TDI lines (Z1-Zn), wherein each TDI line (Z) has m pixels (P), and at least one read-out electronics (11-14), wherein the TDI line detector (1) is subdivided into x submodules (S1-S4), wherein the number of lines (Z) of a submodule (S1-S4) is n/x, wherein a discrete read-out electronics (11-14) is associated with the last line of each submodule (S1-S4), wherein the length (L1) of the read-out electronics (11-14) corresponds to an integer multiple of the length (L2) of a pixel (P), wherein x≥2 is, wherein the associated pixels (P) of different submodules (S1-S4) are arranged pixel to pixel relative to one another or the submodules (S1-S4) or groups of submodules (S1-S4) are laterally interlinked alternately by half a pixel (P).