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Moved TLE import and Satellite creation to TLE companion object

pull/70/head
Arty Bishop 2021-09-08 18:07:04 +01:00
rodzic ae21e9e5ca
commit 60a67f86b6
7 zmienionych plików z 281 dodań i 314 usunięć
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3
app/src/main/java/com/rtbishop/look4sat/framework/db/RoomConverters.kt
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@ -20,6 +20,7 @@ package com.rtbishop.look4sat.framework.db
import androidx.room.TypeConverter
import com.rtbishop.look4sat.domain.predict4kotlin.Satellite
import com.rtbishop.look4sat.domain.predict4kotlin.TLE
import com.rtbishop.look4sat.domain.predict4kotlin.createSat
import com.squareup.moshi.JsonAdapter
import com.squareup.moshi.Moshi
@ -46,6 +47,6 @@ object RoomConverters {
@JvmStatic
@TypeConverter
fun satFromString(string: String): Satellite? {
return Satellite.createSat(tleAdapter.fromJson(string))
return tleAdapter.fromJson(string)?.createSat()
}
}

3
core/src/main/java/com/rtbishop/look4sat/data/SatDataRepository.kt
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@ -21,6 +21,7 @@ import com.rtbishop.look4sat.domain.model.SatEntry
import com.rtbishop.look4sat.domain.model.SatItem
import com.rtbishop.look4sat.domain.model.SatTrans
import com.rtbishop.look4sat.domain.predict4kotlin.Satellite
import com.rtbishop.look4sat.domain.predict4kotlin.TLE
import kotlinx.coroutines.CoroutineDispatcher
import kotlinx.coroutines.coroutineScope
import kotlinx.coroutines.flow.Flow
@ -90,6 +91,6 @@ class SatDataRepository(
}
private fun importSatEntries(stream: InputStream): List<SatEntry> {
return Satellite.importElements(stream).map { tle -> SatEntry(tle) }
return TLE.importElements(stream).map { tle -> SatEntry(tle) }
}
}

394
core/src/main/java/com/rtbishop/look4sat/domain/predict4kotlin/SatPredictor.kt
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@ -2,200 +2,200 @@ package com.rtbishop.look4sat.domain.predict4kotlin
import java.util.*
import kotlin.math.*
const val speedOfLight = 2.99792458E8
const val earthRadiusKm = 6378.16
fun Satellite.getQuarterOrbitMin(): Int {
return (24.0 * 60.0 / this.tle.meanmo / 4.0).toInt()
}
fun SatPos.getRangeCircle(): List<Position> {
val positions = mutableListOf<Position>()
val lat = this.latitude
val lon = this.longitude
// rangeCircleRadiusKm
// earthRadiusKm * acos(earthRadiusKm / (earthRadiusKm + satPos.altitude))
val beta = acos(earthRadiusKm / (earthRadiusKm + this.altitude))
var tempAzimuth = 0
while (tempAzimuth < 360) {
val azimuth = tempAzimuth / 360.0 * 2.0 * Math.PI
var rangelat = asin(sin(lat) * cos(beta) + cos(azimuth) * sin(beta) * cos(lat))
val num = (cos(beta) - (sin(lat) * sin(rangelat)))
val den = cos(lat) * cos(rangelat)
var rangelon = if (tempAzimuth == 0 && (beta > ((Math.PI / 2.0) - lat))) {
lon + Math.PI
} else if (tempAzimuth == 180 && (beta > ((Math.PI / 2.0) - lat))) {
lon + Math.PI
} else if (abs(num / den) > 1.0) {
lon
} else {
if ((180 - tempAzimuth) >= 0) {
lon - acos(num / den)
} else {
lon + acos(num / den)
}
}
while (rangelon < 0.0) rangelon += Math.PI * 2.0
while (rangelon > Math.PI * 2.0) rangelon -= Math.PI * 2.0
rangelat = Math.toDegrees(rangelat)
rangelon = Math.toDegrees(rangelon)
positions.add(Position(rangelat, rangelon))
tempAzimuth += 1
}
return positions
}
fun SatPos.getDownlinkFreq(freq: Long): Long {
return (freq.toDouble() * (speedOfLight - this.rangeRate * 1000.0) / speedOfLight).toLong()
}
fun SatPos.getUplinkFreq(freq: Long): Long {
return (freq.toDouble() * (speedOfLight + this.rangeRate * 1000.0) / speedOfLight).toLong()
}
fun Satellite.getSatPos(date: Date): SatPos {
return this.getPosition(stationPos, date)
}
fun Satellite.getPositions(date: Date, stepSec: Int, minBefore: Int, orbits: Double): List<SatPos> {
val positions = mutableListOf<SatPos>()
val orbitalPeriod = 24 * 60 / this.tle.meanmo
val endDate = Date(date.time + (orbitalPeriod * orbits * 60L * 1000L).toLong())
val startDate = Date(date.time - minBefore * 60L * 1000L)
var currentDate = startDate
while (currentDate.before(endDate)) {
positions.add(getSatPos(currentDate))
currentDate = Date(currentDate.time + stepSec * 1000)
}
return positions
}
fun Satellite.getPasses(refDate: Date, hoursAhead: Int, windBack: Boolean): List<SatPass> {
val passes = mutableListOf<SatPass>()
val oneQuarterOrbitMin = this.getQuarterOrbitMin()
val endDate = Date(refDate.time + hoursAhead * 60L * 60L * 1000L)
var startDate = refDate
var shouldWindBack = windBack
var lastAosDate: Date
var count = 0
if (this.willBeSeen(stationPos)) {
if (this.tle.isDeepspace) {
passes.add(nextDeepSpacePass(refDate))
} else {
do {
if (count > 0) shouldWindBack = false
val pass = nextNearEarthPass(startDate, shouldWindBack)
lastAosDate = pass.aosDate
passes.add(pass)
startDate =
Date(pass.losDate.time + (oneQuarterOrbitMin * 3) * 60L * 1000L)
count++
} while (lastAosDate < endDate)
}
}
return passes
}
private fun Satellite.nextDeepSpacePass(refDate: Date): SatPass {
val satPos = getSatPos(refDate)
val id = this.tle.catnum
val name = this.tle.name
val isDeep = this.tle.isDeepspace
val aos = Date(refDate.time - 24 * 60L * 60L * 1000L).time
val los = Date(refDate.time + 24 * 60L * 60L * 1000L).time
val tca = Date((aos + los) / 2).time
val az = Math.toDegrees(satPos.azimuth)
val elev = Math.toDegrees(satPos.elevation)
val alt = satPos.altitude
return SatPass(id, name, isDeep, aos, az, los, az, tca, az, alt, elev, this)
}
private fun Satellite.nextNearEarthPass(refDate: Date, windBack: Boolean = false): SatPass {
val oneQuarterOrbitMin = this.getQuarterOrbitMin()
val calendar = Calendar.getInstance(TimeZone.getTimeZone("UTC")).apply {
clear()
timeInMillis = refDate.time
}
val id = this.tle.catnum
val name = this.tle.name
val isDeep = this.tle.isDeepspace
var elevation: Double
var maxElevation = 0.0
var alt = 0.0
var tcaAz = 0.0
// wind back time 1/4 of an orbit
if (windBack) calendar.add(Calendar.MINUTE, -oneQuarterOrbitMin)
var satPos = getSatPos(calendar.time)
if (satPos.elevation > 0.0) {
// move forward in 30 second intervals until the sat goes below the horizon
do {
calendar.add(Calendar.SECOND, 30)
satPos = getSatPos(calendar.time)
} while (satPos.elevation > 0.0)
// move forward 3/4 of an orbit
calendar.add(Calendar.MINUTE, oneQuarterOrbitMin * 3)
}
// find the next time sat comes above the horizon
do {
calendar.add(Calendar.SECOND, 60)
satPos = getSatPos(calendar.time)
elevation = satPos.elevation
if (elevation > maxElevation) {
maxElevation = elevation
alt = satPos.altitude
tcaAz = Math.toDegrees(satPos.azimuth)
}
} while (satPos.elevation < 0.0)
// refine to 3 seconds
calendar.add(Calendar.SECOND, -60)
do {
calendar.add(Calendar.SECOND, 3)
satPos = getSatPos(calendar.time)
elevation = satPos.elevation
if (elevation > maxElevation) {
maxElevation = elevation
alt = satPos.altitude
tcaAz = Math.toDegrees(satPos.azimuth)
}
} while (satPos.elevation < 0.0)
val aos = satPos.time.time
val aosAz = Math.toDegrees(satPos.azimuth)
// find when sat goes below
do {
calendar.add(Calendar.SECOND, 30)
satPos = getSatPos(calendar.time)
elevation = satPos.elevation
if (elevation > maxElevation) {
maxElevation = elevation
alt = satPos.altitude
tcaAz = Math.toDegrees(satPos.azimuth)
}
} while (satPos.elevation > 0.0)
// refine to 3 seconds
calendar.add(Calendar.SECOND, -30)
do {
calendar.add(Calendar.SECOND, 3)
satPos = getSatPos(calendar.time)
elevation = satPos.elevation
if (elevation > maxElevation) {
maxElevation = elevation
alt = satPos.altitude
tcaAz = Math.toDegrees(satPos.azimuth)
}
} while (satPos.elevation > 0.0)
val los = satPos.time.time
val losAz = Math.toDegrees(satPos.azimuth)
val tca = Date((aos + los) / 2).time
val elev = Math.toDegrees(maxElevation)
return SatPass(id, name, isDeep, aos, aosAz, los, losAz, tca, tcaAz, alt, elev, this)
}
//
//const val speedOfLight = 2.99792458E8
//const val earthRadiusKm = 6378.16
//
//fun Satellite.getQuarterOrbitMin(): Int {
// return (24.0 * 60.0 / this.tle.meanmo / 4.0).toInt()
//}
//
//fun SatPos.getRangeCircle(): List<Position> {
// val positions = mutableListOf<Position>()
// val lat = this.latitude
// val lon = this.longitude
// // rangeCircleRadiusKm
// // earthRadiusKm * acos(earthRadiusKm / (earthRadiusKm + satPos.altitude))
// val beta = acos(earthRadiusKm / (earthRadiusKm + this.altitude))
// var tempAzimuth = 0
// while (tempAzimuth < 360) {
// val azimuth = tempAzimuth / 360.0 * 2.0 * Math.PI
// var rangelat = asin(sin(lat) * cos(beta) + cos(azimuth) * sin(beta) * cos(lat))
// val num = (cos(beta) - (sin(lat) * sin(rangelat)))
// val den = cos(lat) * cos(rangelat)
// var rangelon = if (tempAzimuth == 0 && (beta > ((Math.PI / 2.0) - lat))) {
// lon + Math.PI
// } else if (tempAzimuth == 180 && (beta > ((Math.PI / 2.0) - lat))) {
// lon + Math.PI
// } else if (abs(num / den) > 1.0) {
// lon
// } else {
// if ((180 - tempAzimuth) >= 0) {
// lon - acos(num / den)
// } else {
// lon + acos(num / den)
// }
// }
// while (rangelon < 0.0) rangelon += Math.PI * 2.0
// while (rangelon > Math.PI * 2.0) rangelon -= Math.PI * 2.0
// rangelat = Math.toDegrees(rangelat)
// rangelon = Math.toDegrees(rangelon)
// positions.add(Position(rangelat, rangelon))
// tempAzimuth += 1
// }
// return positions
//}
//
//fun SatPos.getDownlinkFreq(freq: Long): Long {
// return (freq.toDouble() * (speedOfLight - this.rangeRate * 1000.0) / speedOfLight).toLong()
//}
//
//fun SatPos.getUplinkFreq(freq: Long): Long {
// return (freq.toDouble() * (speedOfLight + this.rangeRate * 1000.0) / speedOfLight).toLong()
//}
//
//fun Satellite.getSatPos(date: Date): SatPos {
// return this.getPosition(stationPos, date)
//}
//
//fun Satellite.getPositions(date: Date, stepSec: Int, minBefore: Int, orbits: Double): List<SatPos> {
// val positions = mutableListOf<SatPos>()
// val orbitalPeriod = 24 * 60 / this.tle.meanmo
// val endDate = Date(date.time + (orbitalPeriod * orbits * 60L * 1000L).toLong())
// val startDate = Date(date.time - minBefore * 60L * 1000L)
// var currentDate = startDate
// while (currentDate.before(endDate)) {
// positions.add(getSatPos(currentDate))
// currentDate = Date(currentDate.time + stepSec * 1000)
// }
// return positions
//}
//
//fun Satellite.getPasses(refDate: Date, hoursAhead: Int, windBack: Boolean): List<SatPass> {
// val passes = mutableListOf<SatPass>()
// val oneQuarterOrbitMin = this.getQuarterOrbitMin()
// val endDate = Date(refDate.time + hoursAhead * 60L * 60L * 1000L)
// var startDate = refDate
// var shouldWindBack = windBack
// var lastAosDate: Date
// var count = 0
// if (this.willBeSeen(stationPos)) {
// if (this.tle.isDeepspace) {
// passes.add(nextDeepSpacePass(refDate))
// } else {
// do {
// if (count > 0) shouldWindBack = false
// val pass = nextNearEarthPass(startDate, shouldWindBack)
// lastAosDate = pass.aosDate
// passes.add(pass)
// startDate =
// Date(pass.losDate.time + (oneQuarterOrbitMin * 3) * 60L * 1000L)
// count++
// } while (lastAosDate < endDate)
// }
// }
// return passes
//}
//
//private fun Satellite.nextDeepSpacePass(refDate: Date): SatPass {
// val satPos = getSatPos(refDate)
// val id = this.tle.catnum
// val name = this.tle.name
// val isDeep = this.tle.isDeepspace
// val aos = Date(refDate.time - 24 * 60L * 60L * 1000L).time
// val los = Date(refDate.time + 24 * 60L * 60L * 1000L).time
// val tca = Date((aos + los) / 2).time
// val az = Math.toDegrees(satPos.azimuth)
// val elev = Math.toDegrees(satPos.elevation)
// val alt = satPos.altitude
// return SatPass(id, name, isDeep, aos, az, los, az, tca, az, alt, elev, this)
//}
//
//private fun Satellite.nextNearEarthPass(refDate: Date, windBack: Boolean = false): SatPass {
// val oneQuarterOrbitMin = this.getQuarterOrbitMin()
// val calendar = Calendar.getInstance(TimeZone.getTimeZone("UTC")).apply {
// clear()
// timeInMillis = refDate.time
// }
// val id = this.tle.catnum
// val name = this.tle.name
// val isDeep = this.tle.isDeepspace
//
// var elevation: Double
// var maxElevation = 0.0
// var alt = 0.0
// var tcaAz = 0.0
//
// // wind back time 1/4 of an orbit
// if (windBack) calendar.add(Calendar.MINUTE, -oneQuarterOrbitMin)
// var satPos = getSatPos(calendar.time)
//
// if (satPos.elevation > 0.0) {
// // move forward in 30 second intervals until the sat goes below the horizon
// do {
// calendar.add(Calendar.SECOND, 30)
// satPos = getSatPos(calendar.time)
// } while (satPos.elevation > 0.0)
// // move forward 3/4 of an orbit
// calendar.add(Calendar.MINUTE, oneQuarterOrbitMin * 3)
// }
//
// // find the next time sat comes above the horizon
// do {
// calendar.add(Calendar.SECOND, 60)
// satPos = getSatPos(calendar.time)
// elevation = satPos.elevation
// if (elevation > maxElevation) {
// maxElevation = elevation
// alt = satPos.altitude
// tcaAz = Math.toDegrees(satPos.azimuth)
// }
// } while (satPos.elevation < 0.0)
//
// // refine to 3 seconds
// calendar.add(Calendar.SECOND, -60)
// do {
// calendar.add(Calendar.SECOND, 3)
// satPos = getSatPos(calendar.time)
// elevation = satPos.elevation
// if (elevation > maxElevation) {
// maxElevation = elevation
// alt = satPos.altitude
// tcaAz = Math.toDegrees(satPos.azimuth)
// }
// } while (satPos.elevation < 0.0)
//
// val aos = satPos.time.time
// val aosAz = Math.toDegrees(satPos.azimuth)
//
// // find when sat goes below
// do {
// calendar.add(Calendar.SECOND, 30)
// satPos = getSatPos(calendar.time)
// elevation = satPos.elevation
// if (elevation > maxElevation) {
// maxElevation = elevation
// alt = satPos.altitude
// tcaAz = Math.toDegrees(satPos.azimuth)
// }
// } while (satPos.elevation > 0.0)
//
// // refine to 3 seconds
// calendar.add(Calendar.SECOND, -30)
// do {
// calendar.add(Calendar.SECOND, 3)
// satPos = getSatPos(calendar.time)
// elevation = satPos.elevation
// if (elevation > maxElevation) {
// maxElevation = elevation
// alt = satPos.altitude
// tcaAz = Math.toDegrees(satPos.azimuth)
// }
// } while (satPos.elevation > 0.0)
//
// val los = satPos.time.time
// val losAz = Math.toDegrees(satPos.azimuth)
// val tca = Date((aos + los) / 2).time
// val elev = Math.toDegrees(maxElevation)
// return SatPass(id, name, isDeep, aos, aosAz, los, losAz, tca, tcaAz, alt, elev, this)
//}

49
core/src/main/java/com/rtbishop/look4sat/domain/predict4kotlin/Satellite.kt
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@ -17,7 +17,6 @@
*/
package com.rtbishop.look4sat.domain.predict4kotlin
import java.io.InputStream
import java.util.*
import java.util.concurrent.atomic.AtomicReference
import kotlin.math.*
@ -346,52 +345,4 @@ abstract class Satellite(val tle: TLE) {
gmst = modulus(gmst + secPerDay * earthRotPerSidDay * ut)
return twoPi * gmst / secPerDay
}
companion object {
fun createSat(tle: TLE?): Satellite? {
return when {
tle == null -> null
tle.isDeepspace -> DeepSpaceSat(tle)
else -> NearEarthSat(tle)
}
}
fun importElements(tleStream: InputStream): List<TLE> {
val currentTLE = arrayOf(String(), String(), String())
val importedTles = mutableListOf<TLE>()
var line = 0
tleStream.bufferedReader().forEachLine {
if (line != 2) {
currentTLE[line] = it
line++
} else {
currentTLE[line] = it
parseElement(currentTLE)?.let { tle -> importedTles.add(tle) }
line = 0
}
}
return importedTles
}
private fun parseElement(tle: Array<String>): TLE? {
if (tle.size != 3) return null
try {
val name: String = tle[0].trim()
val epoch: Double = tle[1].substring(18, 32).toDouble()
val meanmo: Double = tle[2].substring(52, 63).toDouble()
val eccn: Double = 1.0e-07 * tle[2].substring(26, 33).toDouble()
val incl: Double = tle[2].substring(8, 16).toDouble()
val raan: Double = tle[2].substring(17, 25).toDouble()
val argper: Double = tle[2].substring(34, 42).toDouble()
val meanan: Double = tle[2].substring(43, 51).toDouble()
val catnum: Int = tle[1].substring(2, 7).trim().toInt()
val bstar: Double = 1.0e-5 * tle[1].substring(53, 59).toDouble() /
10.0.pow(tle[1].substring(60, 61).toDouble())
return TLE(name, epoch, meanmo, eccn, incl, raan, argper, meanan, catnum, bstar)
} catch (exception: Exception) {
return null
}
}
}
}

66
core/src/main/java/com/rtbishop/look4sat/domain/predict4kotlin/SatelliteFactory.kt
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@ -1,66 +0,0 @@
package com.rtbishop.look4sat.domain.predict4kotlin
import java.io.InputStream
import kotlin.math.pow
object SatelliteFactory {
fun createSat(tle: TLE?): Satellite? {
return when {
tle == null -> null
tle.isDeepspace -> DeepSpaceSat(tle)
else -> NearEarthSat(tle)
}
}
fun createSat(array: Array<String>): Satellite? {
val importedElement = importElement(array)
return createSat(importedElement)
}
fun createDummySat(): Satellite? {
val elementArray = arrayOf(
"ISS (ZARYA)",
"1 25544U 98067A 21242.56000419 .00070558 00000-0 12956-2 0 9996",
"2 25544 51.6433 334.9559 0003020 334.9496 106.9882 15.48593918300128"
)
return createSat(importElement(elementArray))
}
fun importElement(array: Array<String>): TLE? {
if (array.size != 3) return null
try {
val name: String = array[0].trim()
val epoch: Double = array[1].substring(18, 32).toDouble()
val meanmo: Double = array[2].substring(52, 63).toDouble()
val eccn: Double = 1.0e-07 * array[2].substring(26, 33).toDouble()
val incl: Double = array[2].substring(8, 16).toDouble()
val raan: Double = array[2].substring(17, 25).toDouble()
val argper: Double = array[2].substring(34, 42).toDouble()
val meanan: Double = array[2].substring(43, 51).toDouble()
val catnum: Int = array[1].substring(2, 7).trim().toInt()
val bstar: Double = 1.0e-5 * array[1].substring(53, 59).toDouble() /
10.0.pow(array[1].substring(60, 61).toDouble())
return TLE(name, epoch, meanmo, eccn, incl, raan, argper, meanan, catnum, bstar)
} catch (exception: Exception) {
return null
}
}
fun importElements(stream: InputStream): List<TLE> {
val elementArray = arrayOf(String(), String(), String())
val importedElements = mutableListOf<TLE>()
var line = 0
stream.bufferedReader().forEachLine {
if (line != 2) {
elementArray[line] = it
line++
} else {
elementArray[line] = it
importElement(elementArray)?.let { tle -> importedElements.add(tle) }
line = 0
}
}
return importedElements
}
}

54
core/src/main/java/com/rtbishop/look4sat/domain/predict4kotlin/TLE.kt
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@ -17,6 +17,9 @@
*/
package com.rtbishop.look4sat.domain.predict4kotlin
import java.io.InputStream
import kotlin.math.pow
data class TLE(
val name: String,
val epoch: Double,
@ -35,4 +38,55 @@ data class TLE(
val xmo: Double = Math.toRadians(meanan)
val xno: Double = meanmo * Math.PI * 2.0 / 1440
val isDeepspace: Boolean = meanmo < 6.4
companion object {
fun createSat(array: Array<String>): Satellite? {
return importElement(array)?.createSat()
}
fun importElement(array: Array<String>): TLE? {
if (array.size != 3) return null
try {
val name: String = array[0].trim()
val epoch: Double = array[1].substring(18, 32).toDouble()
val meanmo: Double = array[2].substring(52, 63).toDouble()
val eccn: Double = 1.0e-07 * array[2].substring(26, 33).toDouble()
val incl: Double = array[2].substring(8, 16).toDouble()
val raan: Double = array[2].substring(17, 25).toDouble()
val argper: Double = array[2].substring(34, 42).toDouble()
val meanan: Double = array[2].substring(43, 51).toDouble()
val catnum: Int = array[1].substring(2, 7).trim().toInt()
val bstar: Double = 1.0e-5 * array[1].substring(53, 59).toDouble() /
10.0.pow(array[1].substring(60, 61).toDouble())
return TLE(name, epoch, meanmo, eccn, incl, raan, argper, meanan, catnum, bstar)
} catch (exception: Exception) {
return null
}
}
fun importElements(stream: InputStream): List<TLE> {
val elementArray = arrayOf(String(), String(), String())
val importedElements = mutableListOf<TLE>()
var line = 0
stream.bufferedReader().forEachLine {
if (line != 2) {
elementArray[line] = it
line++
} else {
elementArray[line] = it
importElement(elementArray)?.let { tle -> importedElements.add(tle) }
line = 0
}
}
return importedElements
}
}
}
fun TLE.createSat(): Satellite {
return when {
this.isDeepspace -> DeepSpaceSat(this)
else -> NearEarthSat(this)
}
}

26
core/src/test/java/com/rtbishop/look4sat/Look4SatTest.kt 100644
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@ -0,0 +1,26 @@
package com.rtbishop.look4sat
import com.rtbishop.look4sat.domain.predict4kotlin.TLE
import org.junit.Test
class Look4SatTest {
@Test
fun `Given correct TLE array returns Satellite`() {
val elementArray = arrayOf(
"ISS (ZARYA)",
"1 25544U 98067A 21242.56000419 .00070558 00000-0 12956-2 0 9996",
"2 25544 51.6433 334.9559 0003020 334.9496 106.9882 15.48593918300128"
)
assert(TLE.createSat(elementArray) != null)
}
@Test
fun `Given incorrect TLE array returns null`() {
val elementArray = arrayOf(
"1 25544U 98067A 21242.56000419 .00070558 00000-0 12956-2 0 9996",
"2 25544 51.6433 334.9559 0003020 334.9496 106.9882 15.48593918300128"
)
assert(TLE.createSat(elementArray) == null)
}
}