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scottlandisscottlandis
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- updated EW Indication testing to include attacks narrowly against GPS constellation
- added ability to toggle GPS constellation only - added writing of EW risk indicators to the geopackage - added a bit of defensive code based on how the geopackage tools parse time
1 parent 91f4042 commit 042fb49

14 files changed

Lines changed: 274 additions & 77 deletions

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‎torgi/src/main/java/org/sofwerx/torgi/Config.java‎

Lines changed: 15 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -15,6 +15,7 @@ public class Config {
1515
public final static String PREFS_UUID = "callsign";
1616
public final static String PREFS_LAST_SOS_SERVER_IP = "sosip";
1717
public final static String PREFS_REMOTE_IP = "remoteip";
18+
public final static String PREFS_GPS_ONLY = "gpsonly";
1819

1920
private static Config instance = null;
2021
private String savedDir = null;
@@ -23,13 +24,18 @@ public class Config {
2324
private String uuid = null;
2425
private Context context;
2526
private String remoteIP = null;
27+
private static boolean gpsOnly = false;
2628

2729
private Config(Context context) {
2830
this.context = context;
2931
prefs = PreferenceManager.getDefaultSharedPreferences(context);
3032
processEWonboard = prefs.getBoolean(PREFS_PROCESS_EW,false);
3133
}
3234

35+
public void loadPrefs() {
36+
gpsOnly = prefs.getBoolean(PREFS_GPS_ONLY,false);
37+
}
38+
3339
public String getRemoteIp() {
3440
if (remoteIP == null)
3541
remoteIP = prefs.getString(PREFS_REMOTE_IP,null);
@@ -67,6 +73,15 @@ public boolean isAutoShareEnabled() {
6773
return prefs.getBoolean(PREFS_AUTO_SHARE,true);
6874
}
6975

76+
public static boolean isGpsOnly() {
77+
return gpsOnly;
78+
}
79+
80+
public void setGpsOnly(boolean gpsOnly) {
81+
Config.gpsOnly = gpsOnly;
82+
prefs.edit().putBoolean(PREFS_GPS_ONLY,gpsOnly).commit();
83+
}
84+
7085
public boolean processEWOnboard() {
7186
return processEWonboard;
7287
}

‎torgi/src/main/java/org/sofwerx/torgi/gnss/DataPoint.java‎

Lines changed: 30 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -21,6 +21,36 @@ public DataPoint(SpaceTime spaceTime, ArrayList<SatMeasurement> measurements) {
2121
this.measurements = measurements;
2222
}
2323

24+
public ArrayList<Constellation> getConstellationsRepresented() {
25+
ArrayList<Constellation> constellations = null;
26+
if ((measurements != null) && !measurements.isEmpty()) {
27+
Satellite sat;
28+
for (SatMeasurement measurement:measurements) {
29+
sat = measurement.getSat();
30+
if ((sat != null) && (sat.getConstellation() != null)) {
31+
if (constellations == null) {
32+
constellations = new ArrayList<>();
33+
constellations.add(measurement.getSat().getConstellation());
34+
} else {
35+
if (!hasConstellation(constellations,sat.getConstellation()))
36+
constellations.add(sat.getConstellation());
37+
}
38+
}
39+
}
40+
}
41+
return constellations;
42+
}
43+
44+
public static boolean hasConstellation(ArrayList<Constellation> constellations, Constellation constellation) {
45+
if ((constellations != null) && !constellations.isEmpty() && (constellation != null)) {
46+
for (Constellation temp:constellations) {
47+
if (constellation == temp)
48+
return true;
49+
}
50+
}
51+
return false;
52+
}
53+
2454
public DataPoint(SpaceTime spaceTime) {
2555
this.spaceTime = spaceTime;
2656
}

‎torgi/src/main/java/org/sofwerx/torgi/gnss/EWDetection.java‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -73,7 +73,7 @@ public ArrayList<GNSSEWValues> getAllSatMeasurementsForOneSat(Satellite sat, boo
7373

7474
/**
7575
* Updates the baseline for all satellites
76-
* @param discardSignificantDifference true = igonore any measurement that is significantly deviated from the baseline
76+
* @param discardSignificantDifference true = ignore any measurement that is significantly deviated from the baseline
7777
*/
7878
public void updateBaseline(boolean discardSignificantDifference) {
7979
if ((points != null) && !points.isEmpty() && (satellites != null) && !satellites.isEmpty()) {

‎torgi/src/main/java/org/sofwerx/torgi/gnss/EWIndicators.java‎

Lines changed: 26 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -14,13 +14,14 @@
1414
public class EWIndicators {
1515
private final static String TAG = "TORGI.EW";
1616
private final static float CN0_SKEWNESS_BIAS = 1f; //weight to carry CN0 skewness vs other constellation disparities
17+
private final static float GLONASS_MISSING_BIAS = 1f; //weight to carry missing Glonass vs other constellation disparities
1718
private final static float CHISQUARE_BIAS = 1f; //weight to carry Chi Square test vs other constellation disparities
1819
private final static float CONSTELLATION_AVG_CN0_BIAS = 0.5f; //weight to carry Constellation average C/N0 differences vs other constellation disparities
1920
private final static float GPS_SPEC_FOR_EARTH_SURFACE_CN0 = 44; //dB-Hz for ideal condition C/N0 at Earth's surface
2021
private float likelihoodRFI = Float.NaN;
2122
private float likelihoodRSpoofCN0vsAGC = Float.NaN;
2223
private float likelihoodRSpoofConstellationDisparity = Float.NaN;
23-
private float weightOfConstellationDisparity = 1f;
24+
private float weightOfConstellationDisparity = 2f;
2425
private float weightOfSpoofingRisk = 2f;
2526

2627
/**
@@ -235,7 +236,7 @@ private static float getMaxAvgCN0Difference(GNSSEWValues[] values) {
235236
}
236237
}
237238
}
238-
Log.d(TAG,"Createst C/N0 deviation between constellations == "+Float.toString(maxDiff));
239+
Log.d(TAG,"Greatest C/N0 deviation between constellations == "+Float.toString(maxDiff));
239240
if (maxDiff > 0f)
240241
return maxDiff;
241242
}
@@ -268,17 +269,36 @@ private static float getCn0Skewness(ArrayList<GNSSEWValues> values) {
268269
}
269270
return Float.NaN;
270271
}
271-
272272
private final static float SKEWNESS_SCALE = 10f; //10 is arbitrarily chosen to set the scale for the amount of skewness
273+
273274
private static float getSpoofingLikelihoodConstellationDisparity(DataPoint dp) {
274275
if (dp == null)
275276
return 0f;
276-
//return the average of all methods for constellation differences
277+
ArrayList<Constellation> constellations = dp.getConstellationsRepresented();
278+
if ((constellations == null) || constellations.isEmpty()) //this should never happen - if it does, it's probably pretty bad
279+
return 1f;
280+
if (!DataPoint.hasConstellation(constellations,Constellation.GPS)) //if the GPS constellation is missing, that is a very high indicator of jamming
281+
return 1f;
282+
283+
//build the average of all methods for constellation differences
277284
float measureCount = 0f;
278285
float measureSum = 0f;
279286

280-
ArrayList<GNSSEWValues> values = dp.getAllGNSSEWValues();
281-
dp.getAverageDifferenceFromBaselineByConstellation();
287+
//if the Glonass constellation is missing, that could be an indicator of jamming
288+
if (!DataPoint.hasConstellation(constellations,Constellation.Glonass)) {
289+
measureCount += GLONASS_MISSING_BIAS;
290+
measureSum += GLONASS_MISSING_BIAS;
291+
}
292+
293+
//ArrayList<GNSSEWValues> values = dp.getAllGNSSEWValues();
294+
ArrayList<GNSSEWValues> values = new ArrayList<>();
295+
GNSSEWValues[] valueArray = dp.getAverageDifferenceFromBaselineByConstellation();
296+
if (valueArray != null) {
297+
for (GNSSEWValues value:valueArray) {
298+
if (value != null)
299+
values.add(value);
300+
}
301+
}
282302

283303
//Skewness testing for all satellite C/N0 values
284304
float skewness = getCn0Skewness(values);

‎torgi/src/main/java/org/sofwerx/torgi/gnss/SatMeasurement.java‎

Lines changed: 6 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,7 @@
11
package org.sofwerx.torgi.gnss;
22

3+
import org.sofwerx.torgi.Config;
4+
35
import java.util.ArrayList;
46

57
/**
@@ -47,8 +49,10 @@ public static GNSSEWValues getAverageDifference(ArrayList<SatMeasurement> satMea
4749
return null;
4850
ArrayList<GNSSEWValues> values = new ArrayList<>();
4951
for (SatMeasurement sat:satMeasurements) {
50-
if ((sat.values != null) && (sat.getSat() != null) && (sat.getSat().getBaseline() != null))
51-
values.add(GNSSEWValues.getDifference(sat.values,sat.getSat().getBaseline()));
52+
if ((sat.values != null) && (sat.getSat() != null) && (sat.getSat().getBaseline() != null)) {
53+
if (!Config.isGpsOnly() || (sat.getSat().getConstellation() == Constellation.GPS)) //filter out non-GPS constellation satellites if user selected GPS only
54+
values.add(GNSSEWValues.getDifference(sat.values, sat.getSat().getBaseline()));
55+
}
5256
}
5357
if (values.isEmpty())
5458
return null;

‎torgi/src/main/java/org/sofwerx/torgi/ogc/LiteSOSClient.java‎

Lines changed: 3 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -19,8 +19,7 @@
1919
public class LiteSOSClient extends Thread {
2020
private final static String TAG = "TORGI.WS";
2121
private final TorgiService torgiService;
22-
//private String ip = null; //TODO
23-
//private String ip = "http://172.16.117.191:8080";
22+
private final static int TIMEOUT = 15000;
2423
private Handler handler;
2524
private long HELPER_INTERVAL = 1000l * 1l;
2625
private Looper looper = null;
@@ -144,8 +143,8 @@ private String postData(String ip, String data) {
144143
try {
145144
url = new URL(ip);
146145
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
147-
conn.setReadTimeout(7000);
148-
conn.setConnectTimeout(7000);
146+
conn.setReadTimeout(TIMEOUT);
147+
conn.setConnectTimeout(TIMEOUT);
149148
conn.setRequestMethod("GET"); //work around - this still works as a POST, but putting POST here hangs for some reason
150149
conn.setDoInput(true);
151150
conn.setDoOutput(true);

‎torgi/src/main/java/org/sofwerx/torgi/service/GeoPackageRecorder.java‎

Lines changed: 71 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -18,6 +18,9 @@
1818
import org.sofwerx.torgi.Config;
1919
import org.sofwerx.torgi.R;
2020
import org.sofwerx.torgi.SatStatus;
21+
import org.sofwerx.torgi.gnss.DataPoint;
22+
import org.sofwerx.torgi.gnss.EWIndicators;
23+
import org.sofwerx.torgi.gnss.SpaceTime;
2124
import org.sofwerx.torgi.gnss.helper.GeoPackageGPSPtHelper;
2225
import org.sofwerx.torgi.gnss.helper.GeoPackageSatDataHelper;
2326
import org.sofwerx.torgi.listener.GeoPackageRetrievalListener;
@@ -33,6 +36,7 @@
3336
import java.util.LinkedList;
3437
import java.util.List;
3538
import java.util.Locale;
39+
import java.util.TimeZone;
3640
import java.util.concurrent.atomic.AtomicBoolean;
3741

3842
import mil.nga.geopackage.BoundingBox;
@@ -126,6 +130,9 @@ public class GeoPackageRecorder extends HandlerThread {
126130
private final static String GPS_OBS_PT_LNG = "Lon";
127131
private final static String GPS_OBS_PT_ALT = "Alt";
128132
private final static String GPS_OBS_PT_GPS_TIME = "GPSTime";
133+
private final static String GPS_OBS_PT_PROB_RFI = "ProbabilityRFI";
134+
private final static String GPS_OBS_PT_PROB_CN0AGC = "ProbSpoofCN0AGC";
135+
private final static String GPS_OBS_PT_PROB_CONSTELLATION = "ProbSpoofConstellation";
129136

130137
private final static SimpleDateFormat fmtFilenameFriendlyTime = new SimpleDateFormat("YYYYMMdd HHmmss", Locale.US);
131138

@@ -295,6 +302,7 @@ public ArrayList<GeoPackageGPSPtHelper> getGPSObservationPointsBlocking(long sta
295302
final int rowLng = resultCursor.getColumnIndex(GPS_OBS_PT_LNG);
296303
final int rowAlt = resultCursor.getColumnIndex(GPS_OBS_PT_ALT);
297304
final int rowTime = resultCursor.getColumnIndex(GPS_OBS_PT_GPS_TIME);
305+
final int rowProvider = resultCursor.getColumnIndex("Provider");
298306
try{
299307
//FIXME this is a simplified portion of the full table; additional fields may need to be added later
300308
FeatureRow row;
@@ -306,7 +314,9 @@ public ArrayList<GeoPackageGPSPtHelper> getGPSObservationPointsBlocking(long sta
306314
helper.setLng(row.getValue(rowLng));
307315
helper.setAlt(row.getValue(rowAlt));
308316
helper.setTime(row.getValue(rowTime));
309-
measurements.add(helper);
317+
String provider = (String)row.getValue(rowProvider);
318+
if (!"TORGI".equalsIgnoreCase(provider)) //prevent TORGI assessments from being included with raw data going over SOS
319+
measurements.add(helper);
310320
}
311321
} finally {
312322
resultCursor.close();
@@ -829,6 +839,11 @@ public void onLocationChanged(final Location loc) {
829839

830840
frow.setValue("data_dump", loc.toString() + " " + loc.describeContents());
831841

842+
//EW risk values
843+
frow.setValue(GPS_OBS_PT_PROB_RFI,-1d);
844+
frow.setValue(GPS_OBS_PT_PROB_CN0AGC,-1d);
845+
frow.setValue(GPS_OBS_PT_PROB_CONSTELLATION,-1d);
846+
832847
featDao.insert(frow);
833848

834849
for (long id : maprows.values()) {
@@ -872,6 +887,56 @@ public void onLocationChanged(final Location loc) {
872887
}
873888
}
874889

890+
public void onEWDataProcessed(final DataPoint dp, final EWIndicators indicators) {
891+
if (ready.get() && (handler != null) && (dp != null) && (indicators != null)) {
892+
handler.post(() -> {
893+
try {
894+
if (GPSgpkg != null) {
895+
FeatureDao featDao = GPSgpkg.getFeatureDao(PtsTableName);
896+
FeatureRow frow = featDao.newRow();
897+
SpaceTime st = dp.getSpaceTime();
898+
Point fix = new Point(st.getLongitude(),st.getLatitude(),st.getAltitude());
899+
900+
GeoPackageGeometryData geomData = new GeoPackageGeometryData(WGS84_SRS);
901+
geomData.setGeometry(fix);
902+
903+
frow.setGeometry(geomData);
904+
905+
frow.setValue(GPS_OBS_PT_LAT, st.getLatitude());
906+
frow.setValue(GPS_OBS_PT_LNG, st.getLongitude());
907+
frow.setValue(GPS_OBS_PT_ALT, st.getAltitude());
908+
frow.setValue("Provider", "TORGI");
909+
frow.setValue(GPS_OBS_PT_GPS_TIME, st.getTime());
910+
frow.setValue("FixSatCount", 0);
911+
frow.setValue("RadialAccuracy", 0d);
912+
frow.setValue("HasRadialAccuracy", 0);
913+
frow.setValue("Speed", 0d);
914+
frow.setValue("HasSpeed", 0);
915+
frow.setValue("Bearing", 0d);
916+
frow.setValue("HasBearing", 0);
917+
918+
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS", Locale.US);
919+
df.setTimeZone(TimeZone.getTimeZone("UTC")); //needed so geopackage can handle timezone correctly
920+
String formattedDate = df.format(st.getTime())+"Z"; //FIXME this is a little hackish, but the geopackage tools apparently have a hard time dealing with anything other than UTC timezone and it must be designated with "Z" rather than "UTC"
921+
frow.setValue("SysTime", formattedDate);
922+
frow.setValue("HasVerticalAccuracy", 0);
923+
frow.setValue("VerticalAccuracy", 0d);
924+
frow.setValue("data_dump", "");
925+
926+
//EW risk values
927+
frow.setValue(GPS_OBS_PT_PROB_RFI,(double)indicators.getLikelihoodRFI());
928+
frow.setValue(GPS_OBS_PT_PROB_CN0AGC,(double)indicators.getLikelihoodRSpoofCN0vsAGC());
929+
frow.setValue(GPS_OBS_PT_PROB_CONSTELLATION,(double)indicators.getLikelihoodRSpoofConstellationDisparity());
930+
931+
featDao.insert(frow);
932+
}
933+
} catch (Exception e) {
934+
e.printStackTrace();
935+
}
936+
});
937+
}
938+
}
939+
875940
private GeoPackage openDatabase(String database) {
876941
if (gpkg == null) {
877942
GeoPackageManager gpkgMgr = GeoPackageFactory.getManager(context);
@@ -946,6 +1011,11 @@ private UserTable createObservationTable(GeoPackage geoPackage, SpatialReference
9461011
tblcols.add(FeatureColumn.createColumn(colNum++, "RadialAccuracy", REAL, false, null));
9471012
tblcols.add(FeatureColumn.createColumn(colNum++, "VerticalAccuracy", REAL, false, null));
9481013

1014+
//EW risk probability estimates
1015+
tblcols.add(FeatureColumn.createColumn(colNum++, GPS_OBS_PT_PROB_RFI, REAL, false, null));
1016+
tblcols.add(FeatureColumn.createColumn(colNum++, GPS_OBS_PT_PROB_CN0AGC, REAL, false, null));
1017+
tblcols.add(FeatureColumn.createColumn(colNum++, GPS_OBS_PT_PROB_CONSTELLATION, REAL, false, null));
1018+
9491019
tblcols.add(FeatureColumn.createColumn(colNum++, "ElapsedRealtimeNanos", REAL, false, null));
9501020

9511021
tblcols.add(FeatureColumn.createColumn(colNum++, "HasSpeed", INTEGER, false, null));

‎torgi/src/main/java/org/sofwerx/torgi/service/TorgiService.java‎

Lines changed: 4 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -491,13 +491,15 @@ private void createNotificationChannel() {
491491
}
492492
}
493493

494-
public void onEWDataProcessed(DataPoint dp) {
494+
public void onEWDataProcessed(final DataPoint dp) {
495495
if (dp != null) {
496496
if (Config.getInstance(this).processEWOnboard()) {
497-
EWIndicators indicators = EWIndicators.getEWIndicators(dp);
497+
final EWIndicators indicators = EWIndicators.getEWIndicators(dp);
498498
Heatmap.put(dp, indicators);
499499
if (listener != null)
500500
listener.onEWDataProcessed(dp, indicators);
501+
if (geoPackageRecorder != null)
502+
geoPackageRecorder.onEWDataProcessed(dp,indicators);
501503
}
502504
}
503505
}

‎torgi/src/main/res/values/strings.xml‎

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -37,6 +37,8 @@
3737
<string name="title_activity_b">BActivity</string>
3838
<string name="device_callsign">Device Callsign</string>
3939
<string name="device_callsign_narrative">How this device identifies itself on a network</string>
40+
<string name="gps_only">GPS Constellation Only</string>
41+
<string name="gps_only_narrative">Only consider GNSS data from the GPS constellation when calculating EW risks</string>
4042
<string name="share_geopackage">Share</string>
4143
<string name="share_geopackage_narrative">Share the geopackage file as soon as TORGI closes</string>
4244
</resources>

‎torgi/src/main/res/xml/prefs_app.xml‎

Lines changed: 6 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -19,6 +19,12 @@
1919
android:summary="@string/share_geopackage_narrative"
2020
android:defaultValue="true"/>
2121

22+
<CheckBoxPreference
23+
android:key="gpsonly"
24+
android:title="@string/gps_only"
25+
android:summary="@string/gps_only_narrative"
26+
android:defaultValue="false"/>
27+
2228
<Preference
2329
android:key="savedir"
2430
android:title="@string/pref_torgi_dir"

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