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Treat zero-or-missing signal levels as "no information" and don't include them in RSSI.

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This commit is contained in:
Oliver Jowett 2016-02-24 11:51:45 +00:00
parent f7c9aed8b0
commit 214bc0e587
3 changed files with 19 additions and 9 deletions
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18
net_io.c
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@ -373,6 +373,7 @@ static void modesSendBeastOutput(struct modesMessage *mm) {
char *p = prepareWrite(&Modes.beast_out, 2 + 2 * (7 + msgLen));
char ch;
int j;
int sig;
unsigned char *msg = (Modes.net_verbatim ? mm->verbatim : mm->msg);
if (!p)
@ -402,7 +403,12 @@ static void modesSendBeastOutput(struct modesMessage *mm) {
*p++ = (ch = (mm->timestampMsg));
if (0x1A == ch) {*p++ = ch; }
*p++ = ch = (char) round(sqrt(mm->signalLevel) * 255);
sig = round(sqrt(mm->signalLevel) * 255);
if (mm->signalLevel > 0 && sig < 1)
sig = 1;
if (sig > 255)
sig = 255;
*p++ = ch = (char)sig;
if (0x1A == ch) {*p++ = ch; }
for (j = 0; j < msgLen; j++) {
@ -729,8 +735,8 @@ static int decodeBinMessage(struct client *c, char *p) {
clock_gettime(CLOCK_REALTIME, &mm.sysTimestampMsg);
ch = *p++; // Grab the signal level
mm.signalLevel = ((unsigned char)ch / 256.0);
mm.signalLevel = mm.signalLevel * mm.signalLevel + 1e-5;
mm.signalLevel = ((unsigned char)ch / 255.0);
mm.signalLevel = mm.signalLevel * mm.signalLevel;
if (0x1A == ch) {p++;}
for (j = 0; j < msgLen; j++) { // and the data
@ -797,7 +803,7 @@ static int decodeHexMessage(struct client *c, char *hex) {
// Mark messages received over the internet as remote so that we don't try to
// pass them off as being received by this instance when forwarding them
mm.remote = 1;
mm.signalLevel = 1e-5;
mm.signalLevel = 0;
// Remove spaces on the left and on the right
while(l && isspace(hex[l-1])) {
@ -814,8 +820,8 @@ static int decodeHexMessage(struct client *c, char *hex) {
switch(hex[0]) {
case '<': {
mm.signalLevel = ((hexDigitVal(hex[13])<<4) | hexDigitVal(hex[14])) / 256.0;
mm.signalLevel = mm.signalLevel * mm.signalLevel + 1e-5;
mm.signalLevel = ((hexDigitVal(hex[13])<<4) | hexDigitVal(hex[14])) / 255.0;
mm.signalLevel = mm.signalLevel * mm.signalLevel;
hex += 15; l -= 16; // Skip <, timestamp and siglevel, and ;
break;}

9
track.c
View file

@ -66,8 +66,8 @@ struct aircraft *trackCreateAircraft(struct modesMessage *mm) {
// Now initialise things that should not be 0/NULL to their defaults
a->addr = mm->addr;
for (i = 0; i < 8; ++i)
a->signalLevel[i] = mm->signalLevel; // First time, initialise everything
// to the first signal strength
a->signalLevel[i] = 1e-5;
a->signalNext = 0;
// mm->msgtype 32 is used to represent Mode A/C. These values can never change, so
// set them once here during initialisation, and don't bother to set them every
@ -478,7 +478,10 @@ struct aircraft *trackUpdateFromMessage(struct modesMessage *mm)
Modes.aircrafts = a;
}
a->signalLevel[a->messages & 7] = mm->signalLevel;// replace the 8th oldest signal strength
if (mm->signalLevel > 0) {
a->signalLevel[a->signalNext] = mm->signalLevel;
a->signalNext = (a->signalNext + 1) & 7;
}
a->seen = now;
a->messages++;

1
track.h
View file

@ -64,6 +64,7 @@ struct aircraft {
uint32_t addr; // ICAO address
char flight[16]; // Flight number
double signalLevel[8]; // Last 8 Signal Amplitudes
int signalNext; // next index of signalLevel to use
int altitude; // Altitude (Baro)
int altitude_hae; // Altitude (HAE)
int hae_delta; // Difference between HAE and Baro altitudes