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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -9,6 +9,7 @@ test | |
| .eslintrc.json | ||
| .npmignore | ||
| .npmrc | ||
| .raiseverrc | ||
| .travis.yml | ||
| copyright-template.txt | ||
| rollup.* | ||
|
|
||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,20 @@ | ||
| { | ||
| "changelog": { | ||
| "enabled": true, | ||
| "path": "CHANGELOG.md", | ||
| "encoding": "utf-8", | ||
| "prefix": "##", | ||
| "bullet": "-" | ||
| }, | ||
| "git": { | ||
| "enabled": true, | ||
| "release": "master", | ||
| "development": "develop", | ||
| "remote": "origin", | ||
| "commit": true, | ||
| "merge": true, | ||
| "all": false, | ||
| "tag": true, | ||
| "push": false | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,27 +1,25 @@ | ||
| export default function dopplerFactor(location, position, velocity) { | ||
| const currentRange = Math.sqrt( | ||
| ((position.x - location.x) ** 2) | ||
| + ((position.y - location.y) ** 2) | ||
| + ((position.z - location.z) ** 2)); | ||
| const mfactor = 7.292115E-5; | ||
| const c = 299792.458; // Speed of light in km/s | ||
|
|
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| const nextPos = { | ||
| x: position.x + velocity.x, | ||
| y: position.y + velocity.y, | ||
| z: position.z + velocity.z, | ||
| const range = { | ||
| x: position.x - location.x, | ||
| y: position.y - location.y, | ||
| z: position.z - location.z, | ||
| }; | ||
| range.w = Math.sqrt(range.x ** 2 + range.y ** 2 + range.z ** 2); | ||
|
|
||
| const nextRange = Math.sqrt( | ||
| ((nextPos.x - location.x) ** 2) | ||
| + ((nextPos.y - location.y) ** 2) | ||
| + ((nextPos.z - location.z) ** 2)); | ||
|
|
||
| let rangeRate = nextRange - currentRange; | ||
| const rangeVel = { | ||
| x: velocity.x + mfactor * location.y, | ||
| y: velocity.y - mfactor * location.x, | ||
| z: velocity.z, | ||
| }; | ||
|
|
||
| function sign(value) { | ||
| return value >= 0 ? 1 : -1; | ||
| } | ||
|
|
||
| rangeRate *= sign(rangeRate); | ||
| const c = 299792.458; // Speed of light in km/s | ||
| return (1 + (rangeRate / c)); | ||
| const rangeRate = (range.x * rangeVel.x + range.y * rangeVel.y + range.z * rangeVel.z) / range.w; | ||
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| return (1 + (rangeRate / c) * sign(rangeRate)); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,7 +1,70 @@ | ||
| import dopplerFactor from '../src/dopplerFactor'; // eslint-disable-line | ||
|
|
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| const numDigits = 8; | ||
|
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| const earthRadius = 6378.137; | ||
| const sincos45deg = Math.sqrt(2) / 2; | ||
|
|
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| describe('Doppler factor', () => { | ||
| it('doppler factor', () => { | ||
| // TODO: | ||
| it('without observer movement', () => { | ||
| // North Pole | ||
| const observerEcf = { | ||
| x: 0, | ||
| y: 0, | ||
| z: earthRadius, | ||
| }; | ||
| const positionEcf = { | ||
| x: 0, | ||
| y: 0, | ||
| z: earthRadius + 500, | ||
| }; | ||
| // Escape velocity | ||
| const velocityEcf = { | ||
| x: 7.91, | ||
| y: 0, | ||
| z: 0, | ||
| }; | ||
| const dopFactor = dopplerFactor(observerEcf, positionEcf, velocityEcf); | ||
| expect(dopFactor).toBeCloseTo(1, numDigits); | ||
| }); | ||
|
|
||
| it('movement of observer is not affected', () => { | ||
| const observerEcf = { | ||
| x: earthRadius, | ||
| y: 0, | ||
| z: 0, | ||
| }; | ||
| const positionEcf = { | ||
| x: earthRadius + 500, | ||
| y: 0, | ||
| z: 0, | ||
| }; | ||
| const velocityEcf = { | ||
| x: 0, | ||
| y: 7.91, | ||
| z: 0, | ||
| }; | ||
| const dopFactor = dopplerFactor(observerEcf, positionEcf, velocityEcf); | ||
| expect(dopFactor).toBeCloseTo(1, numDigits); | ||
| }); | ||
|
|
||
| it('special case', () => { | ||
| const observerEcf = { | ||
| x: earthRadius, | ||
| y: 0, | ||
| z: 0, | ||
| }; | ||
| const positionEcf = { | ||
| x: (earthRadius + 500) * sincos45deg, // z*sin(45) | ||
| y: (earthRadius + 500) * sincos45deg, // z*cos(45) | ||
| z: 0, | ||
| }; | ||
| const velocityEcf = { | ||
| x: 7.91 * sincos45deg, | ||
| y: 7.91 * sincos45deg, | ||
| z: 0, | ||
| }; | ||
| const dopFactor = dopplerFactor(observerEcf, positionEcf, velocityEcf); | ||
| expect(dopFactor).toBeCloseTo(1.0000107847789212, numDigits); | ||
| }); | ||
| }); |
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