-
Notifications
You must be signed in to change notification settings - Fork 20
/
cprtests.c
309 lines (277 loc) · 16.6 KB
/
cprtests.c
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
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
// Part of dump1090, a Mode S message decoder for RTLSDR devices.
//
// cprtests.c - tests for CPR decoder
//
// Copyright (c) 2014,2015 Oliver Jowett <[email protected]>
//
// This file is free software: you may copy, redistribute and/or modify it
// under the terms of the GNU General Public License as published by the
// Free Software Foundation, either version 2 of the License, or (at your
// option) any later version.
//
// This file is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
#include <math.h>
#include <stdio.h>
#include "cpr.h"
// Global, airborne CPR test data:
static const struct {
int even_cprlat, even_cprlon; // input: raw CPR values, even message
int odd_cprlat, odd_cprlon; // input: raw CPR values, odd message
int even_result; // verify: expected result from decoding with fflag=0 (even message is latest)
double even_rlat, even_rlon; // verify: expected position from decoding with fflag=0 (even message is latest)
int odd_result; // verify: expected result from decoding with fflag=1 (odd message is latest)
double odd_rlat, odd_rlon; // verify: expected position from decoding with fflag=1 (odd message is latest)
} cprGlobalAirborneTests[] = {
{ 80536, 9432, 61720, 9192, 0, 51.686646, 0.700156, 0, 51.686763, 0.701294 },
{ 80534, 9413, 61714, 9144, 0, 51.686554, 0.698745, 0, 51.686484, 0.697632 },
// todo: more positions, bad data
};
// Global, surface CPR test data:
static const struct {
double reflat, reflon; // input: reference location for decoding
int even_cprlat, even_cprlon; // input: raw CPR values, even message
int odd_cprlat, odd_cprlon; // input: raw CPR values, odd message
int even_result; // verify: expected result from decoding with fflag=0 (even message is latest)
double even_rlat, even_rlon; // verify: expected position from decoding with fflag=0 (even message is latest)
int odd_result; // verify: expected result from decoding with fflag=1 (odd message is latest)
double odd_rlat, odd_rlon; // verify: expected position from decoding with fflag=1 (odd message is latest)
} cprGlobalSurfaceTests[] = {
// The real position received here was on the Cambridge (UK) airport apron at 52.21N 0.177E
// We mess with the reference location to check that the right quadrant is used.
// longitude quadrants:
{ 52.00, -180.00, 105730, 9259, 29693, 8997, 0, 52.209984, 0.176601 - 180.0, 0, 52.209976, 0.176507 - 180.0 },
{ 52.00, -140.00, 105730, 9259, 29693, 8997, 0, 52.209984, 0.176601 - 180.0, 0, 52.209976, 0.176507 - 180.0 },
{ 52.00, -130.00, 105730, 9259, 29693, 8997, 0, 52.209984, 0.176601 - 90.0, 0, 52.209976, 0.176507 - 90.0 },
{ 52.00, -50.00, 105730, 9259, 29693, 8997, 0, 52.209984, 0.176601 - 90.0, 0, 52.209976, 0.176507 - 90.0 },
{ 52.00, -40.00, 105730, 9259, 29693, 8997, 0, 52.209984, 0.176601, 0, 52.209976, 0.176507 },
{ 52.00, -10.00, 105730, 9259, 29693, 8997, 0, 52.209984, 0.176601, 0, 52.209976, 0.176507 },
{ 52.00, 0.00, 105730, 9259, 29693, 8997, 0, 52.209984, 0.176601, 0, 52.209976, 0.176507 },
{ 52.00, 10.00, 105730, 9259, 29693, 8997, 0, 52.209984, 0.176601, 0, 52.209976, 0.176507 },
{ 52.00, 40.00, 105730, 9259, 29693, 8997, 0, 52.209984, 0.176601, 0, 52.209976, 0.176507 },
{ 52.00, 50.00, 105730, 9259, 29693, 8997, 0, 52.209984, 0.176601 + 90.0, 0, 52.209976, 0.176507 + 90.0 },
{ 52.00, 130.00, 105730, 9259, 29693, 8997, 0, 52.209984, 0.176601 + 90.0, 0, 52.209976, 0.176507 + 90.0 },
{ 52.00, 140.00, 105730, 9259, 29693, 8997, 0, 52.209984, 0.176601 - 180.0, 0, 52.209976, 0.176507 - 180.0 },
{ 52.00, 180.00, 105730, 9259, 29693, 8997, 0, 52.209984, 0.176601 - 180.0, 0, 52.209976, 0.176507 - 180.0 },
// latitude quadrants (but only 2). The decoded longitude also changes because the cell size changes with latitude
{ 90.00, 0.00, 105730, 9259, 29693, 8997, 0, 52.209984, 0.176601, 0, 52.209976, 0.176507 },
{ 52.00, 0.00, 105730, 9259, 29693, 8997, 0, 52.209984, 0.176601, 0, 52.209976, 0.176507 },
{ 8.00, 0.00, 105730, 9259, 29693, 8997, 0, 52.209984, 0.176601, 0, 52.209976, 0.176507 },
{ 7.00, 0.00, 105730, 9259, 29693, 8997, 0, 52.209984 - 90.0, 0.135269, 0, 52.209976 - 90.0, 0.134299 },
{ -52.00, 0.00, 105730, 9259, 29693, 8997, 0, 52.209984 - 90.0, 0.135269, 0, 52.209976 - 90.0, 0.134299 },
{ -90.00, 0.00, 105730, 9259, 29693, 8997, 0, 52.209984 - 90.0, 0.135269, 0, 52.209976 - 90.0, 0.134299 },
// poles/equator cases
{ -46.00, -180.00, 0, 0, 0, 0, 0, -90.0, -180.000000, 0, -90.0, -180.0 }, // south pole
{ -44.00, -180.00, 0, 0, 0, 0, 0, 0.0, -180.000000, 0, 0.0, -180.0 }, // equator
{ 44.00, -180.00, 0, 0, 0, 0, 0, 0.0, -180.000000, 0, 0.0, -180.0 }, // equator
{ 46.00, -180.00, 0, 0, 0, 0, 0, 90.0, -180.000000, 0, 90.0, -180.0 }, // north pole
};
// Relative CPR test data:
static const struct {
double reflat, reflon; // input: reference location for decoding
int cprlat, cprlon; // input: raw CPR values, even or odd message
int fflag; // input: fflag in raw message
int surface; // input: decode as air (0) or surface (1) position
int result; // verify: expected result
double rlat, rlon; // verify: expected position
} cprRelativeTests[] = {
//
// AIRBORNE
//
{ 52.00, 0.00, 80536, 9432, 0, 0, 0, 51.686646, 0.700156 }, // even, airborne
{ 52.00, 0.00, 61720, 9192, 1, 0, 0, 51.686763, 0.701294 }, // odd, airborne
{ 52.00, 0.00, 80534, 9413, 0, 0, 0, 51.686554, 0.698745 }, // even, airborne
{ 52.00, 0.00, 61714, 9144, 1, 0, 0, 51.686484, 0.697632 }, // odd, airborne
// test moving the receiver around a bit
// We cannot move it more than 1/2 cell away before ambiguity happens.
// latitude must be within about 3 degrees (cell size is 360/60 = 6 degrees)
{ 48.70, 0.00, 80536, 9432, 0, 0, 0, 51.686646, 0.700156 }, // even, airborne
{ 48.70, 0.00, 61720, 9192, 1, 0, 0, 51.686763, 0.701294 }, // odd, airborne
{ 48.70, 0.00, 80534, 9413, 0, 0, 0, 51.686554, 0.698745 }, // even, airborne
{ 48.70, 0.00, 61714, 9144, 1, 0, 0, 51.686484, 0.697632 }, // odd, airborne
{ 54.60, 0.00, 80536, 9432, 0, 0, 0, 51.686646, 0.700156 }, // even, airborne
{ 54.60, 0.00, 61720, 9192, 1, 0, 0, 51.686763, 0.701294 }, // odd, airborne
{ 54.60, 0.00, 80534, 9413, 0, 0, 0, 51.686554, 0.698745 }, // even, airborne
{ 54.60, 0.00, 61714, 9144, 1, 0, 0, 51.686484, 0.697632 }, // odd, airborne
// longitude must be within about 4.8 degrees at this latitude
{ 52.00, 5.40, 80536, 9432, 0, 0, 0, 51.686646, 0.700156 }, // even, airborne
{ 52.00, 5.40, 61720, 9192, 1, 0, 0, 51.686763, 0.701294 }, // odd, airborne
{ 52.00, 5.40, 80534, 9413, 0, 0, 0, 51.686554, 0.698745 }, // even, airborne
{ 52.00, 5.40, 61714, 9144, 1, 0, 0, 51.686484, 0.697632 }, // odd, airborne
{ 52.00, -4.10, 80536, 9432, 0, 0, 0, 51.686646, 0.700156 }, // even, airborne
{ 52.00, -4.10, 61720, 9192, 1, 0, 0, 51.686763, 0.701294 }, // odd, airborne
{ 52.00, -4.10, 80534, 9413, 0, 0, 0, 51.686554, 0.698745 }, // even, airborne
{ 52.00, -4.10, 61714, 9144, 1, 0, 0, 51.686484, 0.697632 }, // odd, airborne
//
// SURFACE
//
// Surface position on the Cambridge (UK) airport apron at 52.21N 0.18E
{ 52.00, 0.00, 105730, 9259, 0, 1, 0, 52.209984, 0.176601 }, // even, surface
{ 52.00, 0.00, 29693, 8997, 1, 1, 0, 52.209976, 0.176507 }, // odd, surface
// test moving the receiver around a bit
// We cannot move it more than 1/2 cell away before ambiguity happens.
// latitude must be within about 0.75 degrees (cell size is 90/60 = 1.5 degrees)
{ 51.46, 0.00, 105730, 9259, 0, 1, 0, 52.209984, 0.176601 }, // even, surface
{ 51.46, 0.00, 29693, 8997, 1, 1, 0, 52.209976, 0.176507 }, // odd, surface
{ 52.95, 0.00, 105730, 9259, 0, 1, 0, 52.209984, 0.176601 }, // even, surface
{ 52.95, 0.00, 29693, 8997, 1, 1, 0, 52.209976, 0.176507 }, // odd, surface
// longitude must be within about 1.25 degrees at this latitude
{ 52.00, 1.40, 105730, 9259, 0, 1, 0, 52.209984, 0.176601 }, // even, surface
{ 52.00, 1.40, 29693, 8997, 1, 1, 0, 52.209976, 0.176507 }, // odd, surface
{ 52.00, -1.05, 105730, 9259, 0, 1, 0, 52.209984, 0.176601 }, // even, surface
{ 52.00, -1.05, 29693, 8997, 1, 1, 0, 52.209976, 0.176507 }, // odd, surface
};
static int testCPRGlobalAirborne() {
int ok = 1;
unsigned i;
for (i = 0; i < sizeof(cprGlobalAirborneTests)/sizeof(cprGlobalAirborneTests[0]); ++i) {
double rlat = 0, rlon = 0;
int res;
res = decodeCPRairborne(cprGlobalAirborneTests[i].even_cprlat, cprGlobalAirborneTests[i].even_cprlon,
cprGlobalAirborneTests[i].odd_cprlat, cprGlobalAirborneTests[i].odd_cprlon,
0,
&rlat, &rlon);
if (res != cprGlobalAirborneTests[i].even_result
|| fabs(rlat - cprGlobalAirborneTests[i].even_rlat) > 1e-6
|| fabs(rlon - cprGlobalAirborneTests[i].even_rlon) > 1e-6) {
ok = 0;
fprintf(stderr,
"testCPRGlobalAirborne[%d,EVEN]: FAIL: decodeCPRairborne(%d,%d,%d,%d,EVEN) failed:\n"
" result %d (expected %d)\n"
" lat %.6f (expected %.6f)\n"
" lon %.6f (expected %.6f)\n",
i,
cprGlobalAirborneTests[i].even_cprlat, cprGlobalAirborneTests[i].even_cprlon,
cprGlobalAirborneTests[i].odd_cprlat, cprGlobalAirborneTests[i].odd_cprlon,
res, cprGlobalAirborneTests[i].even_result,
rlat, cprGlobalAirborneTests[i].even_rlat,
rlon, cprGlobalAirborneTests[i].even_rlon);
} else {
fprintf(stderr, "testCPRGlobalAirborne[%d,EVEN]: PASS\n", i);
}
res = decodeCPRairborne(cprGlobalAirborneTests[i].even_cprlat, cprGlobalAirborneTests[i].even_cprlon,
cprGlobalAirborneTests[i].odd_cprlat, cprGlobalAirborneTests[i].odd_cprlon,
1,
&rlat, &rlon);
if (res != cprGlobalAirborneTests[i].odd_result
|| fabs(rlat - cprGlobalAirborneTests[i].odd_rlat) > 1e-6
|| fabs(rlon - cprGlobalAirborneTests[i].odd_rlon) > 1e-6) {
ok = 0;
fprintf(stderr,
"testCPRGlobalAirborne[%d,ODD]: FAIL: decodeCPRairborne(%d,%d,%d,%d,ODD) failed:\n"
" result %d (expected %d)\n"
" lat %.6f (expected %.6f)\n"
" lon %.6f (expected %.6f)\n",
i,
cprGlobalAirborneTests[i].even_cprlat, cprGlobalAirborneTests[i].even_cprlon,
cprGlobalAirborneTests[i].odd_cprlat, cprGlobalAirborneTests[i].odd_cprlon,
res, cprGlobalAirborneTests[i].odd_result,
rlat, cprGlobalAirborneTests[i].odd_rlat,
rlon, cprGlobalAirborneTests[i].odd_rlon);
} else {
fprintf(stderr, "testCPRGlobalAirborne[%d,ODD]: PASS\n", i);
}
}
return ok;
}
static int testCPRGlobalSurface() {
int ok = 1;
unsigned i;
for (i = 0; i < sizeof(cprGlobalSurfaceTests)/sizeof(cprGlobalSurfaceTests[0]); ++i) {
double rlat = 0, rlon = 0;
int res;
res = decodeCPRsurface(cprGlobalSurfaceTests[i].reflat, cprGlobalSurfaceTests[i].reflon,
cprGlobalSurfaceTests[i].even_cprlat, cprGlobalSurfaceTests[i].even_cprlon,
cprGlobalSurfaceTests[i].odd_cprlat, cprGlobalSurfaceTests[i].odd_cprlon,
0,
&rlat, &rlon);
if (res != cprGlobalSurfaceTests[i].even_result
|| fabs(rlat - cprGlobalSurfaceTests[i].even_rlat) > 1e-6
|| fabs(rlon - cprGlobalSurfaceTests[i].even_rlon) > 1e-6) {
ok = 0;
fprintf(stderr,
"testCPRGlobalSurface[%d,EVEN]: FAIL: decodeCPRsurface(%.6f,%.6f,%d,%d,%d,%d,EVEN) failed:\n"
" result %d (expected %d)\n"
" lat %.6f (expected %.6f)\n"
" lon %.6f (expected %.6f)\n",
i,
cprGlobalSurfaceTests[i].reflat, cprGlobalSurfaceTests[i].reflon,
cprGlobalSurfaceTests[i].even_cprlat, cprGlobalSurfaceTests[i].even_cprlon,
cprGlobalSurfaceTests[i].odd_cprlat, cprGlobalSurfaceTests[i].odd_cprlon,
res, cprGlobalSurfaceTests[i].even_result,
rlat, cprGlobalSurfaceTests[i].even_rlat,
rlon, cprGlobalSurfaceTests[i].even_rlon);
} else {
fprintf(stderr, "testCPRGlobalSurface[%d,EVEN]: PASS\n", i);
}
res = decodeCPRsurface(cprGlobalSurfaceTests[i].reflat, cprGlobalSurfaceTests[i].reflon,
cprGlobalSurfaceTests[i].even_cprlat, cprGlobalSurfaceTests[i].even_cprlon,
cprGlobalSurfaceTests[i].odd_cprlat, cprGlobalSurfaceTests[i].odd_cprlon,
1,
&rlat, &rlon);
if (res != cprGlobalSurfaceTests[i].odd_result
|| fabs(rlat - cprGlobalSurfaceTests[i].odd_rlat) > 1e-6
|| fabs(rlon - cprGlobalSurfaceTests[i].odd_rlon) > 1e-6) {
ok = 0;
fprintf(stderr,
"testCPRGlobalSurface[%d,ODD]: FAIL: decodeCPRsurface(%.6f,%.6f,%d,%d,%d,%d,ODD) failed:\n"
" result %d (expected %d)\n"
" lat %.6f (expected %.6f)\n"
" lon %.6f (expected %.6f)\n",
i,
cprGlobalSurfaceTests[i].reflat, cprGlobalSurfaceTests[i].reflon,
cprGlobalSurfaceTests[i].even_cprlat, cprGlobalSurfaceTests[i].even_cprlon,
cprGlobalSurfaceTests[i].odd_cprlat, cprGlobalSurfaceTests[i].odd_cprlon,
res, cprGlobalSurfaceTests[i].odd_result,
rlat, cprGlobalSurfaceTests[i].odd_rlat,
rlon, cprGlobalSurfaceTests[i].odd_rlon);
} else {
fprintf(stderr, "testCPRGlobalSurface[%d,ODD]: PASS\n", i);
}
}
return ok;
}
static int testCPRRelative() {
int ok = 1;
unsigned i;
for (i = 0; i < sizeof(cprRelativeTests)/sizeof(cprRelativeTests[0]); ++i) {
double rlat = 0, rlon = 0;
int res;
res = decodeCPRrelative(cprRelativeTests[i].reflat, cprRelativeTests[i].reflon,
cprRelativeTests[i].cprlat, cprRelativeTests[i].cprlon,
cprRelativeTests[i].fflag, cprRelativeTests[i].surface,
&rlat, &rlon);
if (res != cprRelativeTests[i].result
|| fabs(rlat - cprRelativeTests[i].rlat) > 1e-6
|| fabs(rlon - cprRelativeTests[i].rlon) > 1e-6) {
ok = 0;
fprintf(stderr,
"testCPRRelative[%d]: FAIL: decodeCPRrelative(%.6f,%.6f,%d,%d,%d,%d) failed:\n"
" result %d (expected %d)\n"
" lat %.6f (expected %.6f)\n"
" lon %.6f (expected %.6f)\n",
i,
cprRelativeTests[i].reflat, cprRelativeTests[i].reflon,
cprRelativeTests[i].cprlat, cprRelativeTests[i].cprlon,
cprRelativeTests[i].fflag, cprRelativeTests[i].surface,
res, cprRelativeTests[i].result,
rlat, cprRelativeTests[i].rlat,
rlon, cprRelativeTests[i].rlon);
} else {
fprintf(stderr, "testCPRRelative[%d]: PASS\n", i);
}
}
return ok;
}
int main(int __attribute__ ((unused)) argc, char __attribute__ ((unused)) **argv) {
int ok = 1;
ok = testCPRGlobalAirborne() && ok;
ok = testCPRGlobalSurface() && ok;
ok = testCPRRelative() && ok;
return ok ? 0 : 1;
}