ham/aprs.ts
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Stricter decoding

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maze
2026-03-15 20:21:26 +01:00
parent 4669783b67
commit e0d4844c5b
12 changed files with 1241 additions and 4188 deletions
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38
src/position.ts
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@@ -1,8 +1,8 @@
import { IPosition, ISymbol } from "./frame.types";
export class Symbol implements ISymbol {
table: string; // Symbol table identifier
code: string; // Symbol code
table: string; // Symbol table identifier
code: string; // Symbol code
constructor(table: string, code?: string) {
if (code === undefined) {
@@ -10,7 +10,9 @@ export class Symbol implements ISymbol {
this.code = table[1];
this.table = table[0];
} else {
throw new Error(`Invalid symbol format: '${table}' (expected 2 characters if code is not provided)`);
throw new Error(
`Invalid symbol format: '${table}' (expected 2 characters if code is not provided)`,
);
}
} else {
this.table = table;
@@ -24,12 +26,12 @@ export class Symbol implements ISymbol {
}
export class Position implements IPosition {
latitude: number; // Decimal degrees
longitude: number; // Decimal degrees
latitude: number; // Decimal degrees
longitude: number; // Decimal degrees
ambiguity?: number; // Position ambiguity (0-4)
altitude?: number; // Meters
speed?: number; // Speed in knots/kmh depending on source
course?: number; // Course in degrees
altitude?: number; // Meters
speed?: number; // Speed in knots/kmh depending on source
course?: number; // Course in degrees
symbol?: Symbol;
comment?: string;
@@ -40,7 +42,7 @@ export class Position implements IPosition {
this.altitude = data.altitude;
this.speed = data.speed;
this.course = data.course;
if (typeof data.symbol === 'string') {
if (typeof data.symbol === "string") {
this.symbol = new Symbol(data.symbol);
} else if (data.symbol) {
this.symbol = new Symbol(data.symbol.table, data.symbol.code);
@@ -51,21 +53,21 @@ export class Position implements IPosition {
public toString(): string {
const latStr = this.latitude.toFixed(5);
const lonStr = this.longitude.toFixed(5);
const altStr = this.altitude !== undefined ? `,${this.altitude}m` : '';
const altStr = this.altitude !== undefined ? `,${this.altitude}m` : "";
return `${latStr},${lonStr}${altStr}`;
}
public distanceTo(other: IPosition): number {
const R = 6371e3; // Earth radius in meters
const lat1 = this.latitude * Math.PI / 180;
const lat2 = other.latitude * Math.PI / 180;
const dLat = (other.latitude - this.latitude) * Math.PI / 180;
const dLon = (other.longitude - this.longitude) * Math.PI / 180;
const lat1 = (this.latitude * Math.PI) / 180;
const lat2 = (other.latitude * Math.PI) / 180;
const dLat = ((other.latitude - this.latitude) * Math.PI) / 180;
const dLon = ((other.longitude - this.longitude) * Math.PI) / 180;
const a = Math.sin(dLat/2) * Math.sin(dLat/2) +
Math.cos(lat1) * Math.cos(lat2) *
Math.sin(dLon/2) * Math.sin(dLon/2);
const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
const a =
Math.sin(dLat / 2) * Math.sin(dLat / 2) +
Math.cos(lat1) * Math.cos(lat2) * Math.sin(dLon / 2) * Math.sin(dLon / 2);
const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
return R * c; // Distance in meters
}