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package TLE
import (
"fmt"
"math"
"strconv"
"strings"
)
func NewTLE(RawTLE string) (TLE, error) {
// split the TLE
var SplitTLE []string = strings.Split(RawTLE, "\n")
// Line One
// parse the line number
LineOneLinenumber, err := strconv.Atoi(string(SplitTLE[1][0]))
if err != nil {
return TLE{}, fmt.Errorf("%s: %#v\n%v", "Could not parse the line number", SplitTLE[1][1], err)
}
// Parse the Satellite Number
SatelliteNumber, err := strconv.Atoi(SplitTLE[1][2:7])
if err != nil {
return TLE{}, 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 TLE{}, 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 TLE{}, fmt.Errorf("%s: %#v\n%v", "Could not parse the Launch Number", SplitTLE[1][11:14], err)
}
// Parse the epoch year
EpochYear, err := strconv.Atoi(SplitTLE[1][18:20])
if err != nil {
return TLE{}, 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 TLE{}, 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 TLE{}, 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 TLE{}, 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 TLE{}, 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 TLE{}, 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 TLE{}, 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 TLE{}, fmt.Errorf("%s: %#v\n%v", "Could not parse the Element set number", SplitTLE[1][64:68], err)
}
// fill the generatedTLE struct
var generatedTLE TLE = TLE{
TitleLine: TitleLine{
Satname: fmt.Sprintf("%-25s", SplitTLE[0][0:24]),
},
LineOne: LineOne{
Linenumber: int8(LineOneLinenumber),
SatelliteNumber: SatelliteNumber,
Classification: string(SplitTLE[1][7]),
InternationalDesignator: InternationalDesignator{
Launchyear: int8(LaunchYear),
Launchnumber: LaunchNumber,
Launchpiece: string(SplitTLE[1][14]),
},
Epoch: Epoch{
Year: int8(EpochYear),
Dayfraction: EpochDayFraction,
},
Firstderiv: FirstDeriv,
Secondderiv: SecondDeriv,
BSTAR: BSTAR,
Numberzero: int8(SplitTLE[1][62]),
ElementSetNumber: ElementSetNumber,
Checksum: int8(SplitTLE[1][68]),
},
LineTwo: LineTwo{},
}
return generatedTLE, nil
}
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