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RS92: GPS doppler const

dump
Zilog80 2016-10-26 13:51:44 +02:00
rodzic a4a11106bf
commit 3edc734805
3 zmienionych plików z 16 dodań i 7 usunięć
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3
rs92/rs92.txt
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@ -75,7 +75,8 @@ und nicht um einen Satelliten, der noch nicht gelockt ist.
pseudochip-counter 32bit-fract, Faktor 2^(-10)=1/1024
df = c/(chips/sec) / 2^10 = 299792.458/1023.0/1024.0 = 0.286183844 // c=299792458m/s, 1023000chips/s
pseudorange[m] = - df[m/chips] * pseudochips[chips]
delta(pseudochips, 1s) = delta_chips/385
dl = L1/(chips/sec)/4 = 1575.42/1.023/4.0; //385.0 // GPS L1 1575.42MHz=154*10.23MHz, dl=154*10/4
delta(pseudochips, 1s) = delta_chips/dl
delta(pseudochips) = ca 25800 +/- d,
+ sat kommt naeher

10
rs92/rs92ecc.c
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@ -878,8 +878,12 @@ RANGE_t range[33];
int prn[12]; // valide PRN 0,..,k-1
// pseudo.range = -df*pseudo.chips , df = lightspeed/(chips/sec)/2^10
// pseudo.range = -df*pseudo.chips
// df = lightspeed/(chips/sec)/2^10
const double df = 299792.458/1023.0/1024.0; //0.286183844 // c=299792458m/s, 1023000chips/s
// dl = L1/(chips/sec)/4
const double dl = 1575.42/1.023/4.0; //385.0 // GPS L1 1575.42MHz=154*10.23MHz, dl=154*10/4
int get_pseudorange() {
ui32_t gpstime;
@ -979,9 +983,9 @@ int get_pseudorange() {
for (j = 0; j < 12; j++) { // 0x013FB0A4
sat[prns[j]].pseudorange = /*0x01400000*/ - range[prns[j]].chips * df;
sat1s[prns[j]].pseudorange = -(range[prns[j]].chips - range[prns[j]].deltachips/385.0)*df;
sat1s[prns[j]].pseudorange = -(range[prns[j]].chips - range[prns[j]].deltachips/dl)*df;
//+ sat[prns[j]].clock_corr - sat1s[prns[j]].clock_corr
sat[prns[j]].pseudorate = - range[prns[j]].deltachips * df / 385.0;
sat[prns[j]].pseudorate = - range[prns[j]].deltachips * df / dl;
}

10
rs92/rs92gps.c
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@ -848,8 +848,12 @@ RANGE_t range[33];
int prn[12]; // valide PRN 0,..,k-1
// pseudo.range = -df*pseudo.chips , df = lightspeed/(chips/sec)/2^10
// pseudo.range = -df*pseudo.chips
// df = lightspeed/(chips/sec)/2^10
const double df = 299792.458/1023.0/1024.0; //0.286183844 // c=299792458m/s, 1023000chips/s
// dl = L1/(chips/sec)/4
const double dl = 1575.42/1.023/4.0; //385.0 // GPS L1 1575.42MHz=154*10.23MHz, dl=154*10/4
int get_pseudorange() {
ui32_t gpstime;
@ -949,9 +953,9 @@ int get_pseudorange() {
for (j = 0; j < 12; j++) { // 0x013FB0A4
sat[prns[j]].pseudorange = /*0x01400000*/ - range[prns[j]].chips * df;
sat1s[prns[j]].pseudorange = -(range[prns[j]].chips - range[prns[j]].deltachips/385.0)*df;
sat1s[prns[j]].pseudorange = -(range[prns[j]].chips - range[prns[j]].deltachips/dl)*df;
//+ sat[prns[j]].clock_corr - sat1s[prns[j]].clock_corr
sat[prns[j]].pseudorate = - range[prns[j]].deltachips * df / 385.0;
sat[prns[j]].pseudorate = - range[prns[j]].deltachips * df / dl;
}