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package tle
import (
"fmt"
"math"
"strconv"
"strings"
)
// NewTLE creates a new TLE object from a given TLE string
func NewTLE(RawTLE string) (TLE, error) {
// split the TLE
var SplitTLE = strings.Split(RawTLE, "\n")
lineOne, err := parseLineOne(SplitTLE)
if err != nil {
return TLE{}, err
}
lineTwo, err := parseLineTwo(SplitTLE)
if err != nil {
return TLE{}, err
}
// fill the generatedTLE struct
var generatedTLE TLE = TLE{
TitleLine: TitleLine{
Satname: fmt.Sprintf("%-24s", SplitTLE[0][0:24]),
},
LineOne: lineOne,
LineTwo: lineTwo,
}
return generatedTLE, nil
}
func parseLineOne(SplitTLE []string) (LineOne, error) {
// parse the line number
LineOneLinenumber, err := strconv.Atoi(string(SplitTLE[1][0]))
if err != nil {
return LineOne{}, fmt.Errorf("%#v\n%v", "Could not parse the line number", err)
}
// Parse the Satellite Number
SatelliteNumber, err := strconv.Atoi(SplitTLE[1][2:7])
if err != nil {
return LineOne{}, fmt.Errorf("%s: %#v\n%v", "Could not parse the Satellite Number", SplitTLE[1][2:7], err)
}
// Parse the launch year
LaunchYear, err := strconv.Atoi(SplitTLE[1][9:11])
if err != nil {
return LineOne{}, fmt.Errorf("%s: %#v\n%v", "Could not parse the Launch Year", SplitTLE[1][9:11], err)
}
// Parse the launch number
LaunchNumber, err := strconv.Atoi(SplitTLE[1][11:14])
if err != nil {
return LineOne{}, fmt.Errorf("%s: %#v\n%v", "Could not parse the Launch Number", SplitTLE[1][11:14], err)
}
// Parse the launch number
LaunchPiece := strings.TrimSpace(SplitTLE[1][14:16])
// Parse the epoch year
EpochYear, err := strconv.Atoi(SplitTLE[1][18:20])
if err != nil {
return LineOne{}, fmt.Errorf("%s: %#v\n%v", "Could not parse the Epoch Year", SplitTLE[1][18:20], err)
}
// Parse the epoch day fraction
EpochDayFraction, err := strconv.ParseFloat(SplitTLE[1][20:32], 64)
if err != nil {
return LineOne{}, fmt.Errorf("%s: %#v\n%v", "Could not parse the Epoch Day Fraction", SplitTLE[1][20:32], err)
}
// Parse the First Time Derivative of the Mean Motion
RawFirstDeriv := strings.TrimSpace(SplitTLE[1][33:43])
FirstDeriv, err := strconv.ParseFloat(RawFirstDeriv, 64)
if err != nil {
return LineOne{}, fmt.Errorf("%s: %#v\n%v", "Could not parse the First Time Derivative of the Mean Motion", SplitTLE[1][33:43], err)
}
/*
Parse the Second Time Derivative of the Mean Motion
*/
RawSecondDerivBase := strings.TrimSpace(SplitTLE[1][44:50])
SecondDerivBase, err := strconv.Atoi(RawSecondDerivBase)
if err != nil {
return LineOne{}, fmt.Errorf("%s: %#v\n%v", "Could not parse the Second Time Derivative of the Mean Motion Base", SplitTLE[1][44:50], err)
}
RawSecondDerivPower := strings.TrimSpace(SplitTLE[1][50:52])
SecondDerivPower, err := strconv.Atoi(RawSecondDerivPower)
if err != nil {
return LineOne{}, fmt.Errorf("%s: %#v\n%v", "Could not parse the Second Time Derivative of the Mean Motion Power", SplitTLE[1][50:52], err)
}
// This converts the following format: (67960-4 = 0.000067960)
// Also: (00000-0 = 0.00000)
SecondDeriv := float64(SecondDerivBase) / math.Pow(10, (-1*float64(SecondDerivPower))+5)
/*
Parse the Second Time Derivative of the Mean Motion
*/
RawBSTARBase := strings.TrimSpace(SplitTLE[1][53:59])
BSTARBase, err := strconv.Atoi(RawBSTARBase)
if err != nil {
return LineOne{}, fmt.Errorf("%s: %#v\n%v", "Could not parse the BSTAR Drag Term Base", SplitTLE[1][53:59], err)
}
RawBSTARPower := strings.TrimSpace(SplitTLE[1][59:61])
BSTARPower, err := strconv.Atoi(RawBSTARPower)
if err != nil {
return LineOne{}, fmt.Errorf("%s: %#v\n%v", "Could not parse the BSTAR Drag Term Power", SplitTLE[1][59:61], err)
}
// This converts the following format: (67960-4 = 0.000067960)
// Also: (00000-0 = 0.00000)
BSTAR := float64(BSTARBase) / math.Pow(10, (-1*float64(BSTARPower))+5)
// Parse the Element set number
RawElementSetNumber := strings.TrimSpace(SplitTLE[1][64:68])
ElementSetNumber, err := strconv.Atoi(RawElementSetNumber)
if err != nil {
return LineOne{}, fmt.Errorf("%s: %#v\n%v", "Could not parse the Element set number", SplitTLE[1][64:68], err)
}
// Parse the Number Zero
NumberZero, err := strconv.Atoi(string(SplitTLE[1][62]))
if err != nil {
return LineOne{}, fmt.Errorf("%s: %#v\n%v", "Could not parse the number zero", SplitTLE[1][62], err)
}
// Parse the Checksum
Checksum, err := strconv.Atoi(string(SplitTLE[1][68]))
if err != nil {
return LineOne{}, fmt.Errorf("%s: %#v\n%v", "Could not parse the checksum", SplitTLE[1][68], err)
}
newLineOne := LineOne{
Linenumber: LineOneLinenumber,
SatelliteNumber: SatelliteNumber,
Classification: string(SplitTLE[1][7]),
InternationalDesignator: InternationalDesignator{
Launchyear: LaunchYear,
Launchnumber: LaunchNumber,
Launchpiece: LaunchPiece,
},
Epoch: Epoch{
Year: EpochYear,
Dayfraction: EpochDayFraction,
},
Firstderiv: FirstDeriv,
Secondderiv: SecondDeriv,
BSTAR: BSTAR,
Numberzero: NumberZero,
ElementSetNumber: ElementSetNumber,
Checksum: Checksum,
}
return newLineOne, nil
}
func parseLineTwo(SplitTLE []string) (LineTwo, error) {
// parse the line number
LineTwoLinenumber, err := strconv.Atoi(string(SplitTLE[2][0]))
if err != nil {
return LineTwo{}, fmt.Errorf("%s: %#v\n%v", "Could not parse the line number", SplitTLE[2][0], err)
}
// Parse the Satellite Number
SatelliteNumber, err := strconv.Atoi(SplitTLE[2][2:7])
if err != nil {
return LineTwo{}, fmt.Errorf("%s: %#v\n%v", "Could not parse the Satellite Number", SplitTLE[2][2:7], err)
}
// Parse the Inclination
RawInclination := strings.TrimSpace(SplitTLE[2][9:16])
Inclination, err := strconv.ParseFloat(RawInclination, 64)
if err != nil {
return LineTwo{}, fmt.Errorf("%s: %#v\n%v", "Could not parse the Inclination", SplitTLE[2][6:19], err)
}
// Parse the RightAscensionOfTheAscendingNode
RawRightAscensionOfTheAscendingNode := strings.TrimSpace(SplitTLE[2][17:25])
RightAscensionOfTheAscendingNode, err := strconv.ParseFloat(RawRightAscensionOfTheAscendingNode, 64)
if err != nil {
return LineTwo{}, fmt.Errorf("%s: %#v\n%v", "Could not parse the RightAscensionOfTheAscendingNode", SplitTLE[2][17:25], err)
}
// Parse the Eccentricity
RawEccentricity := strings.TrimSpace(SplitTLE[2][26:33])
Eccentricity, err := strconv.ParseFloat(RawEccentricity, 64)
if err != nil {
return LineTwo{}, fmt.Errorf("%s: %#v\n%v", "Could not parse the Eccentricity", SplitTLE[2][26:33], err)
}
// Parse the ArgumentOfPerigee
RawArgumentOfPerigee := strings.TrimSpace(SplitTLE[2][34:42])
ArgumentOfPerigee, err := strconv.ParseFloat(RawArgumentOfPerigee, 64)
if err != nil {
return LineTwo{}, fmt.Errorf("%s: %#v\n%v", "Could not parse the ArgumentOfPerigee", SplitTLE[2][34:42], err)
}
// Parse the MeanAnomaly
RawMeanAnomaly := strings.TrimSpace(SplitTLE[2][43:51])
MeanAnomaly, err := strconv.ParseFloat(RawMeanAnomaly, 64)
if err != nil {
return LineTwo{}, fmt.Errorf("%s: %#v\n%v", "Could not parse the MeanAnomaly", SplitTLE[2][43:51], err)
}
// Parse the MeanMotion
RawMeanMotion := strings.TrimSpace(SplitTLE[2][52:63])
MeanMotion, err := strconv.ParseFloat(RawMeanMotion, 64)
if err != nil {
return LineTwo{}, fmt.Errorf("%s: %#v\n%v", "Could not parse the MeanMotion", SplitTLE[2][52:63], err)
}
// Parse the RevolutionNumberAtEpoch
RawRevolutionNumberAtEpoch := strings.TrimSpace(SplitTLE[2][63:68])
RevolutionNumberAtEpoch, err := strconv.Atoi(RawRevolutionNumberAtEpoch)
if err != nil {
return LineTwo{}, fmt.Errorf("%s: %#v\n%v", "Could not parse the RevolutionNumberAtEpoch", SplitTLE[2][63:68], err)
}
// Parse the Checksum
ChecksumLineTwo, err := strconv.Atoi(string(SplitTLE[2][68]))
if err != nil {
return LineTwo{}, fmt.Errorf("%s: %#v\n%v", "Could not parse the checksum", SplitTLE[2][68], err)
}
newLineTwo := LineTwo{
Linenumber: LineTwoLinenumber,
SatelliteNumber: SatelliteNumber,
Inclination: Inclination,
RightAscensionOfTheAscendingNode: RightAscensionOfTheAscendingNode,
Eccentricity: Eccentricity,
ArgumentOfPerigee: ArgumentOfPerigee,
MeanAnomaly: MeanAnomaly,
MeanMotion: MeanMotion,
RevolutionNumberAtEpoch: RevolutionNumberAtEpoch,
Checksum: ChecksumLineTwo,
}
return newLineTwo, nil
}
|
