-
Notifications
You must be signed in to change notification settings - Fork 3
/
reader.c
312 lines (300 loc) · 11.1 KB
/
reader.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
310
311
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#define MAX_CARDS 20
#define MAX_FREQS 1500
#define MAX_PHASES 8192
int verbose=1;
char radar_name[80]="kod";
FILE *calfile=NULL;
struct timeval t0,t1,t2,t3;
unsigned long elapsed;
double timedelays[13]={0.25,0.45,0.8,1.5,2.75,5.0,8.0,15.0,25.0,45.0,80.0,140.0,250.0};
double standard_angles[16]={-30,-20,-10,0,10,20,30,-30,-20,-10,0,10,20,30,40,50};
int antenna_best_code[16];
double antenna_best_time_difference[16];
double antenna_best_time_measured[16];
double antenna_best_time_needed[16];
double spacing=0.1;
double timedelay_needed(double angle,double spacing,int antenna) {
/*
* angle from broadside (degrees) spacing in meters
*/
double deltat=0;
double needed=0;
double c=0.299792458; // meters per nanosecond
deltat=spacing*sin(abs(angle)/180.0*3.14159)/c; //nanoseconds
if (angle > 0) needed=antenna*deltat;
if (angle < 0) needed=(15-antenna)*deltat;
if (needed < 0) {
printf("Error in Time Needed Calc: %lf %lf\n",needed,deltat);
}
return needed;
}
double expected_timedelay(int delaycode) {
int bit,i,code;
double timedelay=0;
code=delaycode;
for (i=0;i<13;i++) {
bit=(code & 0x1);
timedelay+=bit*timedelays[i];
// printf(" Code: %x Bit: %d Value: %d Delay: %lf\n",code,i,bit,timedelays[i]);
code=code >> 1;
}
// printf("Code: %x Total Time Delay: %lf\n",delaycode,timedelay);
return timedelay;
}
double phase_to_timedelay(double phase,double freq,double timedelay,double offset,double ratio,int *cycles,double *delta)
{
/*
* phase in degrees freq in Hz timedelay in ns ratio (0-1)
*/
/* takes phase in degrees 0 -360 */
double time_phase=0;
double initial_time=0;
double difference=0;
double max_time=600.0;
int count=0;
while(phase <= -360.0) {
phase+=360.0;
}
while(phase > 0.0) {
phase-=360.0;
}
if ((phase > 0) ||(phase <=-360)) {
printf("Phase Error: %lf %lf\n",freq,phase);
exit(0);
}
time_phase=-phase/360.0/freq*1E9; // nanoseconds
initial_time=time_phase;
difference=timedelay+offset-time_phase;
printf("%d %lf %lf %lf %lf %lf\n",count, time_phase, timedelay,difference,(difference/timedelay),ratio);
if (timedelay!=0) {
while(((difference/timedelay) > ratio) && (time_phase < max_time)) {
time_phase+=1/(freq*1E-9);
difference=timedelay+offset-time_phase;
count++;
printf("%d %lf %lf %lf %lf %lf\n",count, time_phase, timedelay,difference,(difference/timedelay),ratio);
}
}
if( ((difference/timedelay) < 0) && (count > 0)) {
time_phase-=1/(freq*1E-9);
difference=timedelay+offset-time_phase;
count--;
}
printf("%d %lf %lf %lf %lf %lf\n",count, time_phase, timedelay,difference,(difference/timedelay),ratio);
*cycles=count;
*delta=1/(freq*1E-9);
return time_phase;
}
int main()
{
int num_phasecodes[MAX_CARDS],num_cards[MAX_CARDS],num_freqs[MAX_CARDS],active[MAX_CARDS];
int i,b,c,ii,cc,count;
int f,d,p;
char tmp;
int lowest_pwr_mag_index[3]={-1,-1,-1}; // freq,card,phasecode
double lowest_pwr_mag=1E10; // freq,card,phasecode
int highest_phase_delay_index[MAX_FREQS][2]; // freq,card,phasecode
double highest_phase_delay[MAX_FREQS];
double *freq[MAX_CARDS],*phase[MAX_FREQS][MAX_CARDS],*pwr_mag[MAX_FREQS][MAX_CARDS];
double time_expected=0.0,time_measured=0.0,time_difference=0.0,time0_measured=0.0,time_needed=0.0;
double delta=0.0;
int cycles=0;
int angle,ant;
char filename[120];
for(i=0;i<MAX_FREQS;i++) {
for(ii=0;ii<2;ii++) highest_phase_delay_index[i][ii]=-1;
highest_phase_delay[i]=-1000;
}
printf("Nulling arrays\n");
for(c=0;c<MAX_CARDS;c++) {
active[c]=0;
freq[c]=NULL;
num_freqs[c]=0;
for(i=0;i<MAX_FREQS;i++) {
phase[i][c]=NULL;
pwr_mag[i][c]=NULL;
}
}
for(c=0;c<MAX_CARDS;c++) {
sprintf(filename,"/tmp/phasing_cal_%s_%d.dat",radar_name,c);
calfile=fopen(filename,"r");
printf("%p %s\n",calfile,filename);
if (calfile!=NULL) {
active[c]=1;
fread(&num_phasecodes[c],sizeof(int),1,calfile);
printf("PhaseCodes: %d\n",num_phasecodes[c]);
fread(&num_cards[c],sizeof(int),1,calfile);
printf("Cards: %d\n",num_cards[c]);
fread(&num_freqs[c],sizeof(int),1,calfile);
printf("Freqs: %d\n",num_freqs[c]);
if (num_freqs[c]>MAX_FREQS) {
printf("Too many stored frequencies...up the MAX_FREQS define!\n");
exit(0);
}
printf("Allocating arrays\n");
for(i=0;i<num_freqs[c];i++) {
if (freq[c]!=NULL) free(freq[c]);
freq[c]=calloc(num_freqs[c],sizeof(double));
if (phase[i][c]!=NULL) free(phase[i][c]);
phase[i][c]=calloc(num_phasecodes[c],sizeof(double));
if (pwr_mag[i][c]!=NULL) free(pwr_mag[i][c]);
pwr_mag[i][c]=calloc(num_phasecodes[c],sizeof(double));
}
printf("Reading frequency array\n");
count=fread(freq[c],sizeof(double),num_freqs[c],calfile);
printf("%d %d\n",num_freqs[c],count);
count=1;
printf("Reading in data\n");
while(count>0) {
count=fread(&ii,sizeof(int),1,calfile);
if (count==0) {
break;
}
count=fread(phase[ii][c],sizeof(double),num_phasecodes[c],calfile);
printf("Freq index: %d Phase Count: %d\n",ii,count);
count=fread(pwr_mag[ii][c],sizeof(double),num_phasecodes[c],calfile);
printf("Freq index: %d Pwr-mag Count: %d\n",ii,count);
if (count==0) {
break;
}
}
if (count==0) {
if (feof(calfile)) printf("End of File!\n");
}
fclose(calfile);
for(i=0;i<num_freqs[c];i++) {
if (phase[i][c][0]>highest_phase_delay[i]) {
highest_phase_delay_index[i][0]=c;
highest_phase_delay_index[i][1]=0;
highest_phase_delay[i]=phase[i][c][0];
}
for (b=0;b<num_phasecodes[c];b++) {
if (pwr_mag[i][c][b]<lowest_pwr_mag) {
lowest_pwr_mag_index[0]=i;
lowest_pwr_mag_index[1]=c;
lowest_pwr_mag_index[2]=b;
lowest_pwr_mag=pwr_mag[i][c][b];
}
}
}
}
}
printf("Highest Phase Delay:\n",lowest_pwr_mag);
for(i=0;i<MAX_FREQS;i++) {
printf(" freq: %d card: %d phasecode: %d\n",
i,highest_phase_delay_index[i][0],highest_phase_delay_index[i][1]);
} //End of Card Loop
printf("Lowest Mag: %lf\n",lowest_pwr_mag);
printf("Lowest Mag Index:: freq: %d card: %d phasecode: %d\n",
lowest_pwr_mag_index[0],lowest_pwr_mag_index[1],lowest_pwr_mag_index[2]);
for(c=0;c<MAX_CARDS;c++) {
if(freq[c]!=NULL) free(freq[c]);
freq[c]=NULL;
for(i=0;i<MAX_FREQS;i++) {
if(phase[i][c]!=NULL) free(phase[i][c]);
if(pwr_mag[i][c]!=NULL) free(pwr_mag[i][c]);
phase[i][c]=NULL;
pwr_mag[i][c]=NULL;
}
}
/* Now Process all cards */
for(c=0;c<MAX_CARDS;c++) {
if (active[c]) {
sprintf(filename,"/tmp/phasing_cal_%s_%d.dat",radar_name,c);
calfile=fopen(filename,"r");
printf("%p %s\n",calfile,filename);
if (calfile!=NULL) {
fread(&num_phasecodes[c],sizeof(int),1,calfile);
printf("PhaseCodes: %d\n",num_phasecodes[c]);
fread(&num_cards[c],sizeof(int),1,calfile);
printf("Cards: %d\n",num_cards[c]);
fread(&num_freqs[c],sizeof(int),1,calfile);
printf("Freqs: %d\n",num_freqs[c]);
if (num_freqs[c]>MAX_FREQS) {
printf("Too many stored frequencies...up the MAX_FREQS define!\n");
exit(0);
}
printf("Allocating arrays\n");
for(i=0;i<num_freqs[c];i++) {
if (freq[c]!=NULL) free(freq[c]);
freq[c]=calloc(num_freqs[c],sizeof(double));
if (phase[i][c]!=NULL) free(phase[i][c]);
phase[i][c]=calloc(num_phasecodes[c],sizeof(double));
if (pwr_mag[i][c]!=NULL) free(pwr_mag[i][c]);
pwr_mag[i][c]=calloc(num_phasecodes[c],sizeof(double));
}
printf("Reading frequency array\n");
count=fread(freq[c],sizeof(double),num_freqs[c],calfile);
printf("%d %d\n",num_freqs[c],count);
count=1;
printf("Reading in data\n");
while(count>0) {
count=fread(&ii,sizeof(int),1,calfile);
if (count==0) {
break;
}
count=fread(phase[ii][c],sizeof(double),num_phasecodes[c],calfile);
printf("Freq index: %d Phase Count: %d\n",ii,count);
count=fread(pwr_mag[ii][c],sizeof(double),num_phasecodes[c],calfile);
printf("Freq index: %d Pwr-mag Count: %d\n",ii,count);
if (count==0) {
break;
}
}
if (count==0) {
if (feof(calfile)) printf("End of File!\n");
}
fclose(calfile);
for(f=0;f<num_freqs[c];f++) {
printf("Freq Index: %d\n",f);
for(ant=0;ant<16;ant++) {
antenna_best_code[ant]=-1;
antenna_best_time_difference[ant]=1E8;
antenna_best_time_measured[ant]=-1;
antenna_best_time_needed[ant]=-1;
}
p=1;
for(i=0;i<13;i++) {
time0_measured=phase_to_timedelay(phase[f][c][0],freq[c][f],0.0,0.0,0.1,&cycles, &delta);
time_expected=expected_timedelay(p);
time_measured=phase_to_timedelay(phase[f][c][p],freq[c][f],time_expected,time0_measured,0.1,&cycles, &delta);
// timedelays[i]=time_measured-time0_measured;
printf("Time Delay: %d %d %lf %lf %lf %d\n",i,p,time_expected,time_measured,delta,cycles);
p=p<<1;
}
exit(0);
for(angle=0;angle<16;angle++) {
for(ant=0;ant<16;ant++) {
for(p=0;p<num_phasecodes[c];p++) {
time_expected=expected_timedelay(p);
time0_measured=phase_to_timedelay(phase[f][c][0],freq[c][f],0.0,0.0,0.1,&cycles, &delta);
time_measured=phase_to_timedelay(phase[f][c][p],freq[c][f],time_expected,time0_measured,0.1,&cycles, &delta);
time_needed=timedelay_needed(standard_angles[angle],spacing,ant)+time0_measured;
time_difference=time_needed-time_measured;
if (abs(time_difference) < abs(antenna_best_time_difference[ant])) {
antenna_best_code[ant]=p;
antenna_best_time_difference[ant]=time_difference;
antenna_best_time_measured[ant]=time_measured;
antenna_best_time_needed[ant]=time_needed;
}
// printf("%d %d %d %lf %lf %d\n",angle,ant,p,time_needed,time_measured,cycles);
} // ant loop
} //phase
printf("Freq %lf Angle: %lf:\n",freq[c][f],standard_angles[angle]);
for(ant=0;ant<16;ant++) printf(" Antenna %d Phasecode: %d T: %lf N: %lf\n",
ant,antenna_best_code[ant],antenna_best_time_measured[ant],antenna_best_time_needed[ant]);
} //angle loop
} //freq loop
/* Mean time delay at a phasecode across all frequencies
* for 100 beam directions
*/
/* Highly accurate Time delay at a phasecode for each frequency
* for 100 beam directions
*/
} //if calfile
} // if active
} //card loop
} // end of main