1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
|
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")
////////////////////////////////////////////////////////////////////////////
// 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 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 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)
}
// Parse the Number Zero
NumberZero, err := strconv.Atoi(string(SplitTLE[1][62]))
if err != nil {
return TLE{}, 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 TLE{}, fmt.Errorf("%s: %#v\n%v", "Could not parse the checksum", SplitTLE[1][68], err)
}
////////////////////////////////////////////////////////////////////////////
// Line Two
////////////////////////////////////////////////////////////////////////////
// parse the line number
LineTwoLinenumber, err := strconv.Atoi(string(SplitTLE[2][0]))
if err != nil {
return TLE{}, fmt.Errorf("%s: %#v\n%v", "Could not parse the line number", SplitTLE[2][0], err)
}
// SatelliteNumber
// (Parsed before in line one)
// Parse the Inclination
RawInclination := strings.TrimSpace(SplitTLE[2][9:16])
Inclination, err := strconv.ParseFloat(RawInclination, 64)
if err != nil {
return TLE{}, 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 TLE{}, 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 TLE{}, 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 TLE{}, 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 TLE{}, 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 TLE{}, fmt.Errorf("%s: %#v\n%v", "Could not parse the MeanMotion", SplitTLE[2][52:63], err)
}
// Parse the RevolutionNumberAtEpoch
RevolutionNumberAtEpoch, err := strconv.Atoi(SplitTLE[2][63:68])
if err != nil {
return TLE{}, fmt.Errorf("%s: %#v\n%v", "Could not parse the MeanMotion", SplitTLE[2][63:68], err)
}
// Parse the Checksum
ChecksumLineTwo, err := strconv.Atoi(string(SplitTLE[2][68]))
if err != nil {
return TLE{}, fmt.Errorf("%s: %#v\n%v", "Could not parse the checksum", SplitTLE[2][68], err)
}
// fill the generatedTLE struct
var generatedTLE TLE = TLE{
TitleLine: TitleLine{
Satname: fmt.Sprintf("%-24s", SplitTLE[0][0:24]),
},
LineOne: 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,
},
LineTwo: LineTwo{
Linenumber: LineTwoLinenumber,
SatelliteNumber: SatelliteNumber,
Inclination: Inclination,
RightAscensionOfTheAscendingNode: RightAscensionOfTheAscendingNode,
Eccentricity: Eccentricity,
ArgumentOfPerigee: ArgumentOfPerigee,
MeanAnomaly: MeanAnomaly,
MeanMotion: MeanMotion,
RevolutionNumberAtEpoch: RevolutionNumberAtEpoch,
Checksum: ChecksumLineTwo,
},
}
return generatedTLE, nil
}
|
