X-Git-Url: https://zdv2.bktei.com/gitweb/EVA-2020-02.git/blobdiff_plain/d59a052d726ec948737314b6abec6e2073cf7a37..c503eb7ba7d5a806a791da481bdee5dd240e995f:/exec/bkgpslog

diff --git a/exec/bkgpslog b/exec/bkgpslog
index 1705ab2..4678c1e 100755
--- a/exec/bkgpslog
+++ b/exec/bkgpslog
@@ -28,11 +28,7 @@ declare -a argRecPubKeys # for processArguments function
 
 ## Initialize variables
 OPTION_VERBOSE=""; OPTION_ENCRYPT=""; OPTION_COMPRESS=""; OPTION_TMPDIR="";
-errResetx10e3=0; BUFFER_TTL_ADJ_FLOAT="";
-### PID Control factors
-K_P=10; # Gain for compensating buffer round lag
-T_I=2; # Consider this number of past buffer rounds to eliminate error
-T_D=1; # Predict value this number of buffer rounds into the future
+errReset=0; BUFFER_TTL_ADJ_FLOAT="";
 
 #===BEGIN Declare local script functions===
 checkapp() {
@@ -951,15 +947,20 @@ magicBufferSleepPID() {
     # errorHistorySize=100;
     ## Define BUFFER_TTL in nanoseconds
     BUFFER_TTL_NS=$((BUFFER_TTL * 10**9)) && vbm "BUFFER_TTL_NS:$BUFFER_TTL_NS";
+
+    ### PID Control factors
+    K_P=1; # Gain for compensating buffer round lag
+    T_I="$((4*BUFFER_TTL_NS))"; # Consider this number of past nanoseconds to eliminate error
+    T_D="$((1*BUFFER_TTL_NS))"; # Predict value this number of nanoseconds into the future
     
     # Calculate Error, errNS, in nanoseconds
     ## Get current time
-    timeBufferStartNS="$(timeEpochNS)" && vbm "timeBufferStartNS:$timeBufferStartNS";
+    timeBufferStartNS="$(timeEpochNS)" && vbm "timeBufferStartNS   :$timeBufferStartNS";
     ## Calculate expected time (from start time, current buffer round number, nominal BUFFER_TTL)
     timeBufferStartNSExp="$(( (timeBufferFirstNS) + (BUFFER_TTL_NS * bufferRound) ))" && vbm "timeBufferStartNSExp:$timeBufferStartNSExp";
     ## Calculate error (diff between timeBufferStartNSExp and timeBufferStartNS; usually negative)
     errNS="$(( timeBufferStartNSExp - timeBufferStartNS ))" && vbm "errNS:$errNS";
-    errNSx10e3="$((errNS*10**3))" && vbm "errNSx10e3:$errNSx10e3";
+#    errNSx10e3="$((errNS*10**3))" && vbm "errNSx10e3:$errNSx10e3";
     # ## Append error to errorHistory
     # errorHistory+=("errNS");
     # ### Trim errorHistory array if over errorHistorySize
@@ -975,22 +976,33 @@ magicBufferSleepPID() {
     # for value in "${errorHistory[@]}"; do
     # 	errReset=$(( errReset + ( value*BUFFER_TTL_NS ) ));
     # done;
-    errResetx10e3="$(( ( errResetx10e3 + ( errNS * BUFFER_TTL_NS ) )*10**3 ))" && vbm "errResetx10e3:$errResetx10e3";
+    errReset="$(( (errReset + (errNS*BUFFER_TTL_NS)) ))" && vbm "errReset:$errReset";
+#    errResetx10e3="$(( ( errResetx10e3 + ( errNSx10e3 * BUFFER_TTL_NS ) )*10**3 ))" && vbm "errResetx10e3:$errResetx10e3";
 
-    # Calculate errRate in nanoseconds per 1000 nanoseconds
-    errRatex10e3="$(( ( errNSx10e3 ) / BUFFER_TTL_NS ))" && vbm "errRatex10e3:$errRatex10e3";
+    # Calculate errRate in nanoseconds per nanosecond
+    errRate="$(( errNS / BUFFER_TTL_NS ))" && vbm "errRate:$errRate";
+#    errRatex10e3="$(( ( errNSx10e3 ) / BUFFER_TTL_NS ))" && vbm "errRatex10e3:$errRatex10e3";
     
     # Calculate PID control signal
     ## ADJ = K_P * (errNS + errReset/T_I + errRate*T_D)
-    ADJ="$((K_P*(errNSx10e3 + (errResetx10e3/T_I) + (errRatex10e3*T_D) )/10**3))" && vbm "ADJ:$ADJ";
+    ADJ="$(( K_P*(errNS + errReset/T_I + errRate*T_D) ))" && vbm "ADJ:$ADJ";
+#    ADJ="$((K_P*(errNSx10e3 + (errResetx10e3/T_I) + (errRatex10e3*T_D) )/(10**3)))" && vbm "ADJ:$ADJ";
 
     # Calculate BUFFER_TTL_ADJ_FLOAT from ADJ (ns)
     ## Calculate BUFFER_TTL_ADJ in nanoseconds (BUFFER_TTL_ADJ_NS = BUFFER_TTL_NS + ADJ)
     BUFFER_TTL_ADJ_NS="$((BUFFER_TTL_NS + ADJ))" && vbm "BUFFER_TTL_ADJ_NS:$BUFFER_TTL_ADJ_NS";
     ## Calculate integer seconds
     BUFFER_TTL_ADJ_INT="$((BUFFER_TTL_ADJ_NS/(10**9)))" && vbm "BUFFER_TTL_ADJ_INT:$BUFFER_TTL_ADJ_INT";
+    ### Catch negative integer seconds, set minimum of BUFFER_TTL/10 seconds
+    if [[ "$BUFFER_TTL_ADJ_INT" -le "$((BUFFER_TTL/10))" ]]; then
+	BUFFER_TTL_ADJ_INT="$((BUFFER_TTL/10))";
+	yell "WARNING:Buffer lag adjustment yielded negative seconds.";
+    fi;
     ## Calculate nanosecond remainder
-    BUFFER_TTL_ADJ_FLOATFRAC="$((BUFFER_TTL_NS - (BUFFER_TTL_ADJ_INT*(10**9)) ))" && vbm "BUFFER_TTL_ADJ_FLOATFRAC:$BUFFER_TTL_ADJ_FLOATFRAC";
+    ### Remove integer
+    BUFFER_TTL_ADJ_FLOATFRAC="$((BUFFER_TTL_ADJ_NS - (BUFFER_TTL_ADJ_INT*(10**9)) ))" && vbm "BUFFER_TTL_ADJ_FLOATFRAC:$BUFFER_TTL_ADJ_FLOATFRAC";
+    ### Calc absolute value of fraction (by removing '-' if present; see https://stackoverflow.com/a/47240327
+    BUFFER_TTL_ADJ_FLOATFRAC="${BUFFER_TTL_ADJ_FLOAT_FRAC#-}" && vbm "BUFFER_TTL_ADJ_FLOATFRAC:$BUFFER_TTL_ADJ_FLOATFRAC";
     ## Form float BUFFER_TTL_ADJ_FLOAT
     BUFFER_TTL_ADJ_FLOAT="$BUFFER_TTL_ADJ_INT"."$BUFFER_TTL_ADJ_FLOATFRAC" && vbm "BUFFER_TTL_ADJ_FLOAT:$BUFFER_TTL_ADJ_FLOAT";
     vbm "STATUS:Calculated adjusted BUFFER_TTL (seconds):$BUFFER_TTL_ADJ_FLOAT";
@@ -1310,13 +1322,13 @@ main() {
     CMD_CONV_KML="gpsbabel -i nmea -f - -o kml -F - " && vbm "STATUS:Set CMD_CONV_KML to:$CMD_CONV_KML"; # convert NMEA to KML
 
     # MAIN LOOP:Record gps data until script lifespan ends
-    timeBufferFirstNS="$(timeEpochNS)"; bufferRound=0
+    timeBufferFirstNS="$(timeEpochNS)"; bufferRound=0; BUFFER_TTL_ADJ_FLOAT="10.0";
     while [[ "$SECONDS" -lt "$SCRIPT_TTL" ]]; do
 	magicParseRecipientDir;
 	magicGatherWriteBuffer &
-	magicBufferSleepPID; # Calculates BUFFER_TTL_ADJ from BUFFER_TTL given buffer expected start time vs. actual
 	sleep "$BUFFER_TTL_ADJ_FLOAT";
 	((bufferRound++));
+	magicBufferSleepPID; # Calculates BUFFER_TTL_ADJ from BUFFER_TTL given buffer expected start time vs. actual
     done    
 
     # Cleanup