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Added more precise function to calculate NL (based on cmath lib).

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Created constants for some of the values scattered in the code.
This commit is contained in:
teixeluis 2021-06-19 23:41:06 +01:00
parent 8afd83a4e1
commit 2ceb49e4f2
4 changed files with 51 additions and 12 deletions
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16
firmware/common/adsb.cpp
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@ -141,7 +141,11 @@ float cpr_mod(float a, float b) {
return a - (b * floor(a / b));
}
int cpr_NL(float lat) {
int cpr_NL_precise(float lat) {
return (int) floor(2 * PI / acos(1 - ((1 - cos(PI / (2 * NZ))) / pow(cos(PI * lat / 180), 2))));
}
int cpr_NL_approx(float lat) {
if (lat < 0)
lat = -lat; // Symmetry
@ -150,7 +154,11 @@ int cpr_NL(float lat) {
return 59 - c;
}
return 1;
return 1;
}
int cpr_NL(float lat) {
return cpr_NL_precise(lat);
}
int cpr_N(float lat, int is_odd) {
@ -258,7 +266,7 @@ adsb_pos decode_frame_pos(ADSBFrame& frame_even, ADSBFrame& frame_odd) {
// Compute longitude
if (time_even > time_odd) {
// Use even frame
// Use even frame2
ni = cpr_N(latE, 0);
Dlon = 360.0 / ni;
@ -279,7 +287,7 @@ adsb_pos decode_frame_pos(ADSBFrame& frame_even, ADSBFrame& frame_odd) {
position.latitude = latO;
}
if (position.longitude > 180) position.longitude -= 360;
if (position.longitude >= 180) position.longitude -= 360;
position.valid = true;