feat: 优化卫星实体类，更新 TLE 处理逻辑并增强类型定义
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严浩
@ -1,20 +1,20 @@
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import type { Cartesian3 } from 'cesium';
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import * as Cesium from 'cesium';
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import { propagate, twoline2satrec } from 'satellite.js';
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import { propagate, type SatRec, twoline2satrec } from 'satellite.js';
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class SatelliteEntity {
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private leadTime!: number;
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private name!: string;
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private satrec: any;
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private satrec: SatRec;
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private stepSeconds!: number;
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private tleLine1!: string;
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private tleLine2!: string;
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private totalSeconds!: number;
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private trailTime!: number;
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constructor(tle = '' /* , options = {} */) {
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const [name, tleLine1, tleLine2] = this._checkTle(tle);
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constructor(tle2LineStr = '' /* , options = {} */) {
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const [name, tleLine1, tleLine2] = this._checkTle(tle2LineStr);
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const circle = Number(tleLine2.slice(52, 64));
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this.name = name.trim();
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@ -28,8 +28,8 @@ class SatelliteEntity {
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this.trailTime = 0;
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}
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_checkTle(tle: string) {
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const elements = tle.split('\n');
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_checkTle(tle2LineStr: string) {
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const elements = tle2LineStr.split('\n');
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if (elements.length !== 3) throw new Error('tle data error');
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return elements as [string, string, string];
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}
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@ -1,8 +1,123 @@
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// eslint-disable no-unused-vars
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/* eslint-disable perfectionist/sort-objects */
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import { twoline2satrec } from 'satellite.js';
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// https://en.wikipedia.org/wiki/Two-line_element_set#Format
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// https://celestrak.org/NORAD/elements/gp.php?GROUP=last-30-days&FORMAT=tle
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const longstr1 = `1 63157U 25045A 25069.35219743 .00000545 -65692-6 00000+0 0 9992`;
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const longstr2 = `2 63157 19.0062 64.6364 7327661 179.7218 141.4162 2.26206155 28`;
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export const TLE_LIST = [
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/* `ISS (ZARYA)
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1 25544U 98067A 08264.51782528 -.00002182 00000-0 -11606-4 0 2927
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2 25544 51.6416 247.4627 0006703 130.5360 325.0288 15.72125391563537`, */
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`2025-045A
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1 63157U 25045A 25069.35219743 .00000545 -65692-6 00000+0 0 9992
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2 63157 19.0062 64.6364 7327661 179.7218 141.4162 2.26206155 28`,
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${longstr1}
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${longstr2}`,
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`STARLINK-11371 [DTC]
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1 62879U 25024A 25062.93300820 .00003305 00000+0 21841-4 0 9995
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2 62879 42.9977 257.3937 0001725 269.2925 90.7748 15.77864921 5143`,
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];
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// https://celestrak.org/NORAD/elements/gp.php?GROUP=last-30-days&FORMAT=json
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export const TLE_LIST_JSON = [
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{
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OBJECT_NAME: '2025-045A',
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OBJECT_ID: '2025-045A',
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EPOCH: '2025-03-10T08:27:09.857952',
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MEAN_MOTION: 2.26206155, // 平均运动（Mean Motion），单位是圈/天，表示卫星每天绕地球运行的圈数，此处约为 2.26 圈（周期约 10.6 小时）。
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ECCENTRICITY: 0.7327661, // 偏心率（Eccentricity），无单位，科学记数法为 0.7327661，表示轨道是一个高度椭圆的形状（接近 1 表示非常扁平）。
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INCLINATION: 19.0062, // 轨道倾角（Inclination），单位是度，表示轨道平面与地球赤道的夹角。此处为 19.0062°，属于低倾角轨道。
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RA_OF_ASC_NODE: 64.6364, // 升交点赤经（RAAN, Right Ascension of Ascending Node），单位是度，表示轨道平面在赤道上的交叉点位置。
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ARG_OF_PERICENTER: 179.7218, // 近地点角距（Argument of Perigee），单位是度，表示近地点相对于升交点的角度。
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MEAN_ANOMALY: 141.4162, // 平近点角（Mean Anomaly），单位是度，表示卫星在轨道上的位置。
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EPHEMERIS_TYPE: 0, // 轨道模型类型（通常为 0，表示 SGP4 模型）。
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CLASSIFICATION_TYPE: 'U', // U 表示未分类（可能是临时编号）。
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NORAD_CAT_ID: 63157, // NORAD
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ELEMENT_SET_NO: 999, // 校验码或元素集编号，表示这是第 999 次更新的 TLE 数据。
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REV_AT_EPOCH: 2, // Checksum 校验和
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BSTAR: 0, // 轨道模型类型（0=SGP4模型）。
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MEAN_MOTION_DOT: 5.45e-6, // 0.00000545 // 平均运动的一阶导数（每天的轨道变化率），单位是圈/天²，这里非常小，表示轨道衰减缓慢。
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MEAN_MOTION_DDOT: -6.5692e-7, // 平均运动的二阶导数（科学记数法：-6.5692 × 10⁻⁶），表示轨道受摄动（如大气阻力）的加速度变化。
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},
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];
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// 为了twoline2satrec函数需要哪些参数
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// https://github.com/shashwatak/satellite-js/blob/0e921026d20b75f42553366994af70eed63a304f/src/io.js#L62
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function twoline2satrecFake(longstr1: string, longstr2: string) {
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console.group('twoline2satrec');
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const satrec = {} as Record<string, any>;
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satrec.error = 0;
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satrec.satnum = longstr1.substring(2, 7);
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console.debug(`longstr1.substring(2, 7) :>> `, `"${longstr1.substring(2, 7)}"`);
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satrec.epochyr = parseInt(longstr1.substring(18, 20), 10);
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console.debug(`longstr1.substring(18, 20) :>> `, `"${longstr1.substring(18, 20)}"`);
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satrec.epochdays = parseFloat(longstr1.substring(20, 32));
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console.debug(`longstr1.substring(20, 32) :>> `, `"${longstr1.substring(20, 32)}"`);
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satrec.ndot = parseFloat(longstr1.substring(33, 43));
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console.debug(`longstr1.substring(33, 43) :>> `, `"${longstr1.substring(33, 43)}"`);
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satrec.nddot = parseFloat(`.${parseInt(longstr1.substring(44, 50), 10)}E${longstr1.substring(50, 52)}`);
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console.debug(`longstr1.substring(44, 50) :>> `, `"${longstr1.substring(44, 50)}"`);
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console.debug(`longstr1.substring(50, 52) :>> `, `"${longstr1.substring(50, 52)}"`);
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satrec.bstar = parseFloat(
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`${longstr1.substring(53, 54)}.${parseInt(longstr1.substring(54, 59), 10)}E${longstr1.substring(59, 61)}`,
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);
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console.debug(`longstr1.substring(53, 54) :>> `, `"${longstr1.substring(53, 54)}"`);
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console.debug(`longstr1.substring(54, 59) :>> `, `"${longstr1.substring(54, 59)}"`);
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console.debug(`longstr1.substring(59, 61) :>> `, `"${longstr1.substring(59, 61)}"`);
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// satrec.satnum = longstr2.substring(2, 7);
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satrec.inclo = parseFloat(longstr2.substring(8, 16));
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console.debug(`longstr2.substring(8, 16) :>> `, `"${longstr2.substring(8, 16)}"`);
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satrec.nodeo = parseFloat(longstr2.substring(17, 25));
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console.debug(`longstr2.substring(17, 25) :>> `, `"${longstr2.substring(17, 25)}"`);
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satrec.ecco = parseFloat(`.${longstr2.substring(26, 33)}`);
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console.debug(`longstr2.substring(26, 33) :>> `, `"${longstr2.substring(26, 33)}"`);
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satrec.argpo = parseFloat(longstr2.substring(34, 42));
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console.debug(`longstr2.substring(34, 42) :>> `, `"${longstr2.substring(34, 42)}"`);
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satrec.mo = parseFloat(longstr2.substring(43, 51));
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console.debug(`longstr2.substring(43, 51) :>> `, `"${longstr2.substring(43, 51)}"`);
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satrec.no = parseFloat(longstr2.substring(52, 63));
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console.debug(`longstr2.substring(52, 63) :>> `, `"${longstr2.substring(52, 63)}"`);
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console.groupEnd();
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return satrec;
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}
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// console.debug(`twoline2satrecFake(longstr1, longstr2) :>> `, twoline2satrecFake(longstr1, longstr2));
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const satrec1 = twoline2satrec(longstr1, longstr2);
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const satrec2 = twoline2satrec(
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`1 63157 25069.35219743 .00000545 -65692-6 00000+0 `,
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`2 19.0062 64.6364 7327661 179.7218 141.4162 2.26206155 `,
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);
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const satrec1_str = JSON.stringify(satrec1, null, 2);
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const satrec2_str = JSON.stringify(satrec2, null, 2);
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if ($__DEV__) console.debug(`satrec1_str === satrec2_str :>> `, satrec1_str === satrec2_str);
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// longstr1.substring(2, 7) :>> "63157"
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// longstr1.substring(18, 20) :>> "25"
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// longstr1.substring(20, 32) :>> "069.35219743"
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// longstr1.substring(33, 43) :>> " .00000545"
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// longstr1.substring(44, 50) :>> "-65692"
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// longstr1.substring(50, 52) :>> "-6"
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// longstr1.substring(53, 54) :>> " "
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// longstr1.substring(54, 59) :>> "00000"
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// longstr1.substring(59, 61) :>> "+0"
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//
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// longstr2.substring(8, 16) :>> " 19.0062"
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// longstr2.substring(17, 25) :>> " 64.6364"
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// longstr2.substring(26, 33) :>> "7327661"
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// longstr2.substring(34, 42) :>> "179.7218"
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// longstr2.substring(43, 51) :>> "141.4162"
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// longstr2.substring(52, 63) :>> " 2.26206155"
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