🎯 Satellite Pointing Budget Calculator

RSS error-source table · total 3σ accuracy vs requirement · ground projection

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Error Sources (3σ, per axis)

One row per contributor. Blank/zero rows are ignored. Independent sources combine as root-sum-square.

每个误差源一行，留空/为 0 忽略。相互独立的误差按均方根（RSS）合成。

Error source3σ (arcsec)Share of RSS²

Requirement & Orbit

Results

RSS total
– ″ 3σ
In degrees
– °
Margin vs requirement
– %
Ground error at nadir
– m
Largest contributor
–
–
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📖 How to use

  1. List every contributor at 3σ per axis: attitude knowledge (sensors), control error, sensor-to-payload alignment, launch shift, thermoelastic distortion, actuator ripple…逐项列出 3σ 单轴误差：定姿（敏感器）、控制误差、敏感器-载荷安装标定、发射变形、热弹性变形、执行机构抖动等。
  2. Typical sensor values are on the Reference page; thermoelastic and alignment terms usually dominate below ~30″ budgets.敏感器典型值见参考页；预算低于约 30″ 时通常由热弹性与安装项主导。
  3. The "share of RSS²" column shows where to invest — halving the biggest term beats eliminating three small ones."RSS² 占比"列指明改进方向——压减最大项的一半胜过消掉三个小项。
  4. Feed the RSS total into the Geolocation Error tool as attitude knowledge, and into SatTools' link budget as antenna pointing loss input.RSS 总值可作为定位误差工具的姿态精度输入，也可用于 SatTools 链路预算的指向损耗。

Pointing budgets

Independent zero-mean error sources combine as σ_total = √(Σ σ_i²). Systematic biases that can be calibrated out are excluded; residual calibration error stays in.

Distinguish three related budgets: knowledge (where you think you point — sensors), control (how well the loop follows — adds control error), and payload pointing (adds alignment and structural/thermal distortions). This page RSSes whatever rows you include, so it serves any of the three.

Ground projection at nadir: err ≈ h·θ (θ in radians) — 1″ from 500 km ≈ 2.4 m.

All computation runs locally in your browser.

指向精度预算

相互独立的零均值误差按 σ_总 = √(Σ σ_i²) 合成。可标定消除的系统偏差不计入；标定残差保留。

区分三个层次的预算：定姿精度（认为指向哪——敏感器），控制精度（环路跟得多好——加控制误差），载荷指向精度（再加安装与结构/热变形）。本页对所填各行做 RSS，三种预算通用。

星下点地面投影：误差 ≈ h·θ（θ 取弧度）——500 km 高度 1″ ≈ 2.4 m。

全部计算在你的浏览器本地完成。