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* ISS Telemetry Integration
* Fetches live ISS position from BOB VOYAGER and renders on Bloch sphere
* NORAD 25544 · ISS ZARYA
*/
export class ISSTelemetry {
constructor(scene, options = {}) {
this.scene = scene;
this.voyagerUrl = options.voyagerUrl || 'http://localhost:4299';
this.issMesh = null;
this.trailPoints = [];
this.trailGeometry = null;
this.trailMesh = null;
this.hudElement = options.hudElement || null;
this.isLive = false;
this.lastUpdate = null;
}
/**
* Map lat/lon/alt to Bloch sphere coordinates
* Normalize satellite position to unit sphere surface
*/
latLonToBloch(lat, lon, alt) {
// Convert to radians
const latRad = (lat * Math.PI) / 180;
const lonRad = (lon * Math.PI) / 180;
// Normalize altitude (0-500km) to 0-0.3 sphere offset
const altNorm = Math.min(alt / 500, 1.0) * 0.3;
// Map to sphere surface with altitude offset
const radius = 1.0 + altNorm;
const x = radius * Math.cos(latRad) * Math.cos(lonRad);
const y = radius * Math.sin(latRad);
const z = radius * Math.cos(latRad) * Math.sin(lonRad);
return { x, y, z };
}
/**
* Create ISS position marker (glowing dot)
*/
createISSTelemetryMarker() {
if (this.issMesh) {
this.scene.remove(this.issMesh);
}
// Glowing sphere
const geo = new THREE.SphereGeometry(0.08, 16, 16);
const mat = new THREE.MeshPhongMaterial({
color: 0xff00ff,
emissive: 0xff00ff,
emissiveIntensity: 0.8,
transparent: true,
opacity: 0.9,
});
this.issMesh = new THREE.Mesh(geo, mat);
this.scene.add(this.issMesh);
// Glow effect (outer halo)
const glowGeo = new THREE.SphereGeometry(0.12, 16, 16);
const glowMat = new THREE.MeshBasicMaterial({
color: 0xff00ff,
transparent: true,
opacity: 0.3,
});
const glowMesh = new THREE.Mesh(glowGeo, glowMat);
this.issMesh.add(glowMesh);
}
/**
* Initialize trail line (orbit path)
*/
initializeTrail() {
if (this.trailMesh) {
this.scene.remove(this.trailMesh);
}
this.trailPoints = [];
this.trailGeometry = new THREE.BufferGeometry();
const trailMat = new THREE.LineBasicMaterial({
color: 0xff00ff,
transparent: true,
opacity: 0.4,
linewidth: 1,
});
this.trailMesh = new THREE.Line(this.trailGeometry, trailMat);
this.scene.add(this.trailMesh);
}
/**
* Add position to trail
*/
addToTrail(pos) {
this.trailPoints.push(new THREE.Vector3(pos.x, pos.y, pos.z));
// Keep max 200 trail points
if (this.trailPoints.length > 200) {
this.trailPoints.shift();
}
if (this.trailGeometry) {
this.trailGeometry.setFromPoints(this.trailPoints);
}
}
/**
* Fetch live ISS telemetry from BOB VOYAGER
*/
async fetchISSTelemetry() {
try {
const res = await fetch(`${this.voyagerUrl}/api/telemetry`);
const data = await res.json();
if (!data.ok || !data.telemetry) {
console.error('[ISS] Invalid telemetry response');
return null;
}
return {
lat: data.telemetry.latitude,
lon: data.telemetry.longitude,
alt: data.telemetry.altitude,
vel: data.telemetry.velocity,
timestamp: data.telemetry.fetched_at,
worm: data.worm_head,
};
} catch (e) {
console.error('[ISS] Fetch failed:', e.message);
return null;
}
}
/**
* Update ISS position on sphere
*/
async update() {
const telemetry = await this.fetchISSTelemetry();
if (!telemetry) return;
if (!this.issMesh) {
this.createISSTelemetryMarker();
this.initializeTrail();
}
// Convert to Bloch sphere coordinates
const pos = this.latLonToBloch(telemetry.lat, telemetry.lon, telemetry.alt);
this.issMesh.position.set(pos.x, pos.y, pos.z);
// Animate glow
if (this.issMesh.children[0]) {
this.issMesh.children[0].material.opacity = 0.3 + 0.2 * Math.sin(Date.now() * 0.005);
}
// Add to trail
this.addToTrail(pos);
// Update HUD
if (this.hudElement) {
this.hudElement.innerHTML = `
<div><span class="label">ISS:</span> <span class="value">${telemetry.lat.toFixed(2)}° ${telemetry.lon.toFixed(2)}°</span></div>
<div><span class="label">ALT:</span> <span class="value">${telemetry.alt.toFixed(0)}km VEL ${telemetry.vel.toFixed(2)}km/s</span></div>
<div><span class="label">WORM:</span> <span class="value">${telemetry.worm}</span></div>
`;
}
this.lastUpdate = telemetry;
this.isLive = true;
}
/**
* Start continuous updates
*/
startPolling(intervalMs = 4500) {
console.log('[ISS] Starting telemetry polling at', intervalMs, 'ms interval');
this.pollingInterval = setInterval(() => this.update(), intervalMs);
// Do first update immediately
this.update();
}
/**
* Stop polling
*/
stopPolling() {
if (this.pollingInterval) {
clearInterval(this.pollingInterval);
}
}
/**
* Get last telemetry
*/
getLastTelemetry() {
return this.lastUpdate;
}
}
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