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Remove comm-b "consistency" bonuses, look at inconsistent data only.

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Rescale penalties so badly inconsistent messages will tend to get
the same penalty in all formats, so the ambiguity check kicks in.

With this final change the HEADING_SPEED and TRACK_TURN message rates
are almost identical, which is what we'd expect to see if the
interrogator is asking for both at about the same rate.

Before:

    567 AMBIGUOUS
   7445 GICB_CAPS
  19173 EMPTY_RESPONSE
  75252 UNKNOWN
  76469 AIRCRAFT_IDENT
 127603 ACAS_RA
 212654 HEADING_SPEED
 223068 DATALINK_CAPS
 229807 TRACK_TURN
 269267 VERTICAL_INTENT
    466 "suspicious"

After:

   7445 GICB_CAPS
  17432 AMBIGUOUS
  19173 EMPTY_RESPONSE
  75252 UNKNOWN
  76469 AIRCRAFT_IDENT
 127603 ACAS_RA
 212718 HEADING_SPEED
 212878 TRACK_TURN
 223068 DATALINK_CAPS
 269267 VERTICAL_INTENT
    328 "suspicious"
This commit is contained in:
Oliver Jowett 2019-05-02 18:19:27 +08:00
parent 5eb0bd10ea
commit 39aeb7a48c
1 changed files with 17 additions and 28 deletions
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45
comm_b.c
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@ -358,29 +358,24 @@ static int decodeBDS40(struct modesMessage *mm, bool store)
return 0;
}
// small bonuses for consistent data
if (mcp_valid && fms_valid && mcp_alt == fms_alt) {
score += 2;
}
if (baro_valid && baro_raw == 2132) {
// 1013.2mb, standard pressure
score += 2;
// small penalty for inconsistent data
if (mcp_valid && fms_valid && mcp_alt != fms_alt) {
score -= 4;
}
if (mcp_valid) {
unsigned remainder = mcp_alt % 500;
if (remainder < 16 || remainder > 484) {
// mcp altitude is a multiple of 500
score += 2;
if (!(remainder < 16 || remainder > 484)) {
// mcp altitude is not a multiple of 500
score -= 4;
}
}
if (fms_valid) {
unsigned remainder = fms_alt % 500;
if (remainder < 16 || remainder > 484) {
// fms altitude is a multiple of 500
score += 2;
if (!(remainder < 16 || remainder > 484)) {
// fms altitude is not a multiple of 500
score -= 4;
}
}
@ -544,13 +539,11 @@ static int decodeBDS50(struct modesMessage *mm, bool store)
return 0;
}
// small bonuses for consistent data
// small penalty for inconsistent data
if (gs_valid && tas_valid) {
int delta = abs((int)gs_valid - (int)tas_valid);
if (delta < 50) {
score += 5;
} else if (delta > 150) {
score -= 5;
if (delta > 150) {
score -= 6;
}
}
@ -558,10 +551,8 @@ static int decodeBDS50(struct modesMessage *mm, bool store)
if (roll_valid && tas_valid && tas > 0 && track_rate_valid) {
double turn_rate = 68625 * tan(roll * M_PI / 180.0) / (tas * 20 * M_PI);
double delta = fabs(turn_rate - track_rate);
if (delta < 0.5) {
score += 5;
} else if (delta > 2.0) {
score -= 5;
if (delta > 2.0) {
score -= 6;
}
}
@ -704,16 +695,14 @@ static int decodeBDS60(struct modesMessage *mm, bool store)
return 0;
}
// small bonuses for consistent data
// small penalty for inconsistent data
// Should check IAS vs Mach at given altitude, but the maths is a little involved
if (baro_rate_valid && inertial_rate_valid) {
int delta = abs(baro_rate - inertial_rate);
if (delta < 500) {
score += 5;
} else if (delta > 2000) {
score -= 5;
if (delta > 2000) {
score -= 12;
}
}