Added test for Issue 698 fix.

src/test/java/org/orekit/gnss/RinexLoaderTest.java

@@ -729,6 +729,22 @@ public class RinexLoaderTest {
         Assert.assertEquals(37.594,                  ods.get(3).getObservationData().get(4).getValue(), 1.0e-15);
     }
 
+    @Test
+    public void testIssue698() {
+        // Test missing Beidou observation type for Rinex 3.04
+        RinexObservationLoader  loader = load("rinex/abcd083.06o");
+        AbsoluteDate t0 = new AbsoluteDate(2016, 3, 24, 13, 10, 36.0, TimeScalesFactory.getGPS());
+        List<ObservationDataSet> ods = loader.getObservationDataSets();
+        Assert.assertEquals(2, ods.size());
+
+        // Test Beidou
+        Assert.assertEquals(SatelliteSystem.BEIDOU, ods.get(1).getSatelliteSystem());
+        Assert.assertEquals(6,                      ods.get(1).getPrnNumber());
+        Assert.assertEquals(0.0,                    ods.get(1).getDate().durationFrom(t0), 1.0e-15);
+        Assert.assertEquals(41,                     ods.get(1).getObservationData().size());
+
+    }
+
     private void checkObservation(final ObservationDataSet obser,
                                   final int year, final int month, final int day,
                                   final int hour, final int minute, final double second,

src/test/resources/rinex/abcd083.06o

+     3.04           OBSERVATION DATA    M                   RINEX VERSION / TYPE
+Values contained in the files are not real ones.            COMMENT
+The objective is to test that Beidou observation type are   COMMENT
+read properly.                                              COMMENT
+XXRINEXO V9.9       AIUB                20060324 144333 UTC PGM / RUN BY / DATE
+A 9080                                                      MARKER NAME
+9080.1.34                                                   MARKER NUMBER     
+BILL SMITH          ABC INSTITUTE                           OBSERVER / AGENCY   
+X1234A123           GEODETIC            1.3.1               REC # / TYPE / VERS
+G1234               ROVER                                   ANT # / TYPE
+  2104228.     -5642017.      2095406.                      APPROX POSITION XYZ
+         .9030         .0000         .0000                  ANTENNA: DELTA H/E/N
+     0                                                      RCV CLOCK OFFS APPL
+G    5 C1C L1W L2W C1W S2W                                  SYS / # / OBS TYPES
+C   41 C5D C5P C5X C6A C6Q C7D C7P C7Z C8D C8P C8X D5D D5P  SYS / # / OBS TYPES
+       D5X D6A D7D D7P D7Z D8D D8P D8X L5D L5P L5X L6A L7D  SYS / # / OBS TYPES
+       L7P L7Z L8D L8P L8X S5D S5P S5X S6A S7D S7P S7Z S8D  SYS / # / OBS TYPES
+       S8P S8X                                              SYS / # / OBS TYPES
+    18.000                                                  INTERVAL
+DBHZ                                                        SIGNAL STRENGTH UNIT
+  2006    03    24    13    10   36.0000000     GPS         TIME OF FIRST OBS
+ 18 R01  1 R02  2 R03  3 R04  4 R05  5 R06 -6 R07 -5 R08 -4 GLONASS SLOT / FRQ #
+    R09 -3 R10 -2 R11 -1 R12  0 R13  1 R14  2 R15  0 R16  4 GLONASS SLOT / FRQ #
+    R17  5 R18 -5                                           GLONASS SLOT / FRQ #
+G L1C                                                       SYS / PHASE SHIFT
+G L1W                                                       SYS / PHASE SHIFT
+G L2W   0.00000                                             SYS / PHASE SHIFT
+R L1C   0.00000                                             SYS / PHASE SHIFT
+E L1B   0.00000                                             SYS / PHASE SHIFT
+E L5I   0.00000                                             SYS / PHASE SHIFT
+S L1C   0.00000                                             SYS / PHASE SHIFT
+ C1C    0.000 C2C    0.000 C2P    0.000                     GLONASS COD/PHS/BIS
+                                                            END OF HEADER
+> 2016 03 24 13 10 36.0000000  0  2       0.000000000000
+G06  23629347.915      651379.300 8                  23629347.158          24.158
+C06  23544632.969 6 125506152.806 6        40.400    23544630.660 6 125506177.799 6        38.200    23544639.055 5  97615985.468 5        33.900    23544639.875 5  97615969.480 5        33.200    23544639.875 5  97615969.480 5        33.200    23544639.875 5  97615969.480 5        33.200    23544639.875 5  97615969.480 5        33.200    23544639.875 5  97615969.480 5        33.200    23544639.875 5  97615969.480 5        33.200    23544639.875 5  97615969.480 5        33.200    23544639.875 5  97615969.480 5        33.200    23544639.875 5  97615969.480 5        33.200    23544639.875 5  97615969.480 5        33.200    23544639.875 5  97615969.480 5
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