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Meisei: Verify parameter values 

iMS-100 parameters must meet certain requirements for the temperature
algorithm to work.
pull/45/head
Rolf Meeser 2022-07-02 11:30:50 +02:00
rodzic 4b4d8c0693
commit ac134940b9
1 zmienionych plików z 30 dodań i 4 usunięć
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34
demod/mod/meisei100mod.c
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@ -250,6 +250,33 @@ static int get_w16(ui8_t *subframe_bits, int j) {
/* -------------------------------------------------------------------------- */
static int sanity_check_ims100_config_temperature(gpx_t *gpx) {
int result = 1;
float R_old = 0;
float T_old = INFINITY;
int i;
// All resistance values in the R-T interpolation table must be positive and monotonically increasing
for (i = 0; i < 12; i++) {
if (gpx->cfg[33+i] <= R_old) {
result = 0;
}
R_old = gpx->cfg[33+i];
}
// All temperature values in the R-T interpolation table must be monotonically decreasing
for (i = 0; i < 12; i++) {
if (gpx->cfg[17+i] >= T_old) {
result = 0;
}
T_old = gpx->cfg[17+i];
}
return result;
}
/* -------------------------------------------------------------------------- */
int main(int argc, char **argv) {
@ -912,7 +939,8 @@ int main(int argc, char **argv) {
if (gpx.f_ref != 0) { // must know the reference frequency
int T_cfg = ((gpx.cfg_valid & 0x01E01FFE1FFE0000LL) == 0x01E01FFE1FFE0000LL); // cfg[56:53,44:33,28:17]
int U_cfg = ((gpx.cfg_valid & 0x001E000000000000LL) == 0x001E000000000000LL); // cfg[52:49]
if (T_cfg) {
// Necessary parameters must exist and their values must ´meet the requirements
if (T_cfg && sanity_check_ims100_config_temperature(&gpx)) {
ui16_t t_raw = bits2val(subframe_bits+HEADLEN+2*46+17, 16);
float f = ((float)t_raw / (float)gpx.f_ref) * 4.0f;
if (f > 1.0f) {
@ -929,11 +957,9 @@ int main(int argc, char **argv) {
} else {
// We now know that R is inside the interpolation range. Sampling points are
// ordered by increasing resistance (decreasing temperature).
// (We have verified this in the sanity check above.)
// Search for the interval that contains R, then interpolate linearly
// (using log(R)).
// NOTE: This assumes that the sonde sends the sampling points as described
// above. Shall we do a sanity check to confirm?
// For the time being, T=NAN in case the search doesn't find an interval.
for (j = 0; j < 11; j++) {
if (R < gpx.cfg[34+j]) {
f = (logf(R) - logf(gpx.cfg[33+j])) / (logf(gpx.cfg[34+j]) - logf(gpx.cfg[33+j]));