NOAA/PMEL Argo Profiling Floats: General Information

NOAA/Pacific Marine Environmental Laboratory
Argo Profiling Floats:
Engineering Statistics

Reliability Statistics

The reliability of the floats can be measured in terms of the number of profiles expected during a specified time period as compared to the number actually executed. These statistics are presented in the following table (updated daily).

Profiling Drifter Reliability

Profiler Reliability Statistics for the period from May 01 07:01 GMT 2001 to Oct 14 15:15 GMT 2004.
Group	Size	Profiles Executed	Profiles Expected	Reliability (%)
APEX260	70	2432	2851	85.3
APF-7	4	311	468	66.5
APF-8	66	2121	2383	89.0
Total	70	2432	2851	85.3

Argos Data Telemetry

The data are recovered from the floats via the Argos system. These floats spend several hours transmitting on the surface at a rate of roughly one message per minute. This means that each float transmits several hundred messages for each profile. Most of these transmissions are lost because no satellite happens to be overhead. In fact, telemetry statistics below show that only 7 to 10 percent of these messages are transmitted when a satellite is overhead. Some statistics have wider appeal and we have collected several of them in the table below (updated daily). All of these statistics were computed on a per-profile basis.

Float Id: A unique 3 digit identifier assigned to each float.
Number of Profiles: The number of profiles the float has executed so far. For purposes of computing Argos receipt statistics, the initial 6 hour period that the float spends transmitting prior to its first descent is counted as if it were a profile.
Incomplete Profiles: The number of profiles that have an incomplete Argos message set. This condition results in a missing segment of data in the profile plots. The accompanying percentage gives the ratio of the Incomplete Profiles to the Number of Profiles.
Satellite Passes: The average number of times that a satellite passed overhead while the float was on the surface.
Messages Expected: This is the average number of messages that should have been received when satellites were overhead. If two or more satellites are overhead simultaneously then each transmission was multiply-counted. The number of messages expected for a given satellite pass is determined from the Argos data stream by counting the number of messages received and adding the number of messages missing. Due to averaging and rounding effects, these entries in the table below may not add up exactly.
Messages Received: This is the average number of messages that were actually received by satellites (without regard to the CRC check). The accompanying percentage gives the average ratio of the messages received to the messages expected.
Messages Missing: This is the average number of messages that were transmitted while a given satellite was overhead but that were not received by the satellite. These are detected in the Argos data stream by gaps in time and message number. The accompanying percentage gives the average ratio of the messages missing to the messages expected.
Good Messages: This is the average number of messages received that passed the CRC check. The accompanying percentage gives the average ratio of the good messages to the messages received.
Bad Messages: This is the average number of messages received that failed the CRC check. The accompanying percentage gives the average ratio of the bad messages to the messages received.
Telemetric Efficiency: This measures the average rate of successful transmission when satellites are overhead. It is the average ratio of the number of good messages to the number of messages expected.

NOAA/PMEL SSL Profiling Float ARGOS Receipt Statistics

As of 14:45 GMT on Sep 27, 2004 Average Per-Profile Statistics for ARGOS Data Telemetry

Float
Id Profiles
Executed Incomplete
Profiles Satellite
Passes Telemetric
Efficiency Messages
Expected Messages
Received Messages
Missing Good
Messages Bad
Messages

0464 113 11 9.7% 19 60% 173 135 78% 39 22% 104 77% 31 23%

0470 109 11 10.1% 18 57% 178 133 75% 45 25% 101 76% 32 24%

0503 78 4 5.1% 16 68% 171 142 83% 29 17% 117 82% 25 18%

0507 15 1 6.7% 9 74% 103 92 88% 11 12% 77 83% 15 17%

0584 93 12 12.9% 18 55% 184 132 74% 51 26% 98 74% 34 26%

0588 85 10 11.8% 18 57% 164 122 76% 42 24% 92 75% 31 25%

0590 47 3 6.4% 9 75% 88 76 87% 12 13% 65 86% 11 14%

0637 110 8 7.3% 20 54% 210 156 74% 54 26% 115 72% 41 28%

0639 109 6 5.5% 20 67% 203 166 82% 37 18% 135 81% 30 19%

0647 73 4 5.5% 14 64% 141 112 81% 29 19% 88 80% 23 20%

0803 33 3 9.1% 13 48% 183 121 67% 62 33% 86 71% 35 29%

0808 78 9 11.5% 18 56% 195 143 74% 51 26% 109 76% 35 24%

0810 73 5 6.8% 20 59% 226 171 76% 56 24% 133 78% 38 22%

0811 83 3 3.6% 22 70% 272 228 84% 44 16% 191 84% 37 16%

0812 83 3 3.6% 24 59% 341 257 75% 84 25% 203 78% 53 22%

0813 79 4 5.1% 18 56% 219 159 72% 60 28% 123 77% 37 23%

0814 82 6 7.3% 21 50% 235 159 69% 76 31% 115 72% 44 28%

0815 79 4 5.1% 17 60% 249 185 75% 64 25% 148 80% 37 20%

0816 83 4 4.8% 21 62% 301 221 77% 80 23% 179 80% 42 20%

0817 79 2 2.5% 17 57% 201 148 74% 53 26% 115 77% 33 23%

0818 79 2 2.5% 18 56% 231 167 72% 64 28% 130 77% 37 23%

0819 79 6 7.6% 19 55% 211 154 74% 57 26% 116 75% 37 25%

1506 22 1 4.5% 15 70% 216 187 86% 30 14% 152 81% 35 19%

1507 22 1 4.5% 16 71% 228 196 86% 32 14% 161 83% 35 17%

1508 23 1 4.3% 21 73% 290 252 87% 38 13% 211 83% 41 17%

1509 23 1 4.3% 22 72% 283 241 86% 43 14% 201 83% 40 17%

1510 22 1 4.5% 18 73% 263 235 89% 28 11% 193 82% 42 18%

1511 22 1 4.5% 16 69% 242 203 84% 38 16% 166 82% 37 18%

1512 23 1 4.3% 23 69% 329 275 84% 54 16% 226 82% 49 18%

1513 23 1 4.3% 23 72% 321 275 86% 46 14% 228 83% 46 17%

1514 22 1 4.5% 17 72% 255 221 87% 34 13% 184 83% 37 17%

1515 18 1 5.6% 20 61% 255 192 76% 62 24% 155 80% 37 20%

1516 16 1 6.2% 12 64% 153 117 78% 36 22% 98 83% 20 17%

1517 16 2 12.5% 12 59% 221 117 73% 104 27% 93 80% 24 20%

1518 16 1 6.2% 13 64% 160 125 77% 35 23% 106 82% 19 18%

1519 16 1 6.2% 11 65% 154 118 78% 35 22% 98 83% 20 17%

1520 25 1 4.0% 11 73% 147 124 85% 23 15% 108 86% 17 14%

1521 26 1 3.8% 12 75% 161 136 85% 25 15% 119 88% 17 12%

1522 16 2 12.5% 19 57% 346 191 71% 155 29% 156 81% 36 19%

1523 25 1 4.0% 10 74% 153 127 84% 25 16% 113 88% 15 12%

1524 25 1 4.0% 10 73% 143 120 84% 22 16% 105 86% 16 14%

1525 25 1 4.0% 10 69% 161 130 81% 30 19% 111 85% 19 15%

1526 12 1 8.3% 11 74% 140 121 87% 19 13% 103 85% 18 15%

1527 6 1 16.7% 12 70% 186 154 82% 32 18% 130 85% 23 15%

1528 8 1 12.5% 11 73% 139 119 86% 20 14% 100 85% 19 15%

1529 13 1 7.7% 11 63% 186 135 76% 51 24% 113 83% 23 17%

1530 7 1 14.3% 11 71% 183 150 82% 33 18% 132 87% 18 13%

1532 17 1 5.9% 14 71% 170 141 83% 29 17% 121 85% 20 15%

1533 17 1 5.9% 13 72% 178 146 82% 32 18% 127 87% 19 13%

1534 16 2 12.5% 11 66% 155 116 79% 39 21% 97 84% 19 16%

1535 17 1 5.9% 11 71% 179 141 82% 38 18% 123 87% 18 13%

1536 16 1 6.2% 14 56% 203 142 71% 61 29% 114 80% 29 20%

1537 16 1 6.2% 14 58% 204 143 72% 61 28% 117 82% 26 18%

1538 10 1 10.0% 11 67% 160 132 83% 28 17% 108 82% 24 18%

1576 6 1 16.7% 11 0% 225 162 76% 62 24% 0 0% 162 100%

1820 5 2 40.0% 9 0% 140 123 89% 17 11% 0 0% 123 100%

1821 1 1 100.0% 6 0% 93 80 86% 13 14% 0 0% 80 100%

1822 5 1 20.0% 10 0% 158 119 78% 39 22% 0 0% 119 100%

1823 4 1 25.0% 10 0% 137 108 81% 29 19% 0 0% 108 100%

1824 5 1 20.0% 9 0% 125 113 91% 12 9% 0 0% 113 100%

1825 5 1 20.0% 10 0% 153 134 89% 19 11% 0 0% 134 100%

1826 5 1 20.0% 11 0% 191 154 80% 38 20% 0 0% 154 100%

1827 4 1 25.0% 9 0% 127 104 83% 24 17% 0 0% 104 100%

1828 4 1 25.0% 10 0% 231 113 66% 118 34% 0 0% 113 100%

1829 4 1 25.0% 15 0% 166 128 80% 38 20% 0 0% 128 100%

1830 5 1 20.0% 10 0% 135 115 81% 19 19% 0 0% 115 100%

1831 4 1 25.0% 13 0% 200 164 83% 36 17% 0 0% 164 100%

1832 5 1 20.0% 11 0% 160 141 89% 20 11% 0 0% 141 100%

1931 1 1 100.0% 6 0% 247 56 23% 191 77% 0 0% 56 100%

1932 3 1 33.3% 12 0% 163 122 74% 41 26% 0 0% 122 100%

1933 3 1 33.3% 14 0% 163 139 84% 24 16% 0 0% 139 100%

1934 2 1 50.0% 8 0% 124 103 89% 20 11% 0 0% 103 100%

1936 2 1 50.0% 10 0% 116 102 89% 15 11% 0 0% 102 100%

1938 3 1 33.3% 11 0% 147 122 85% 25 15% 0 0% 122 100%

1939 3 1 33.3% 10 0% 351 111 58% 240 42% 0 0% 111 100%

1940 4 1 25.0% 12 0% 163 145 90% 18 10% 0 0% 145 100%

1941 4 1 25.0% 12 0% 369 178 65% 191 35% 0 0% 178 100%

Ensemble Average: 15.0% 17 60% 209 160 78% 49 22% 123 76% 36 24%

Standard Deviation: 17.7% 10 16% 128 93 10% 62 10% 80 16% 28 16%

As of 14:45 GMT on Sep 27, 2004		Average Per-Profile Statistics for ARGOS Data Telemetry
Float Id	Profiles Executed	Incomplete Profiles		Satellite Passes		Telemetric Efficiency		Messages Expected		Messages Received		Messages Missing		Good Messages		Bad Messages
0464	113	11	9.7%		19		60%		173		135	78%		39	22%		104	77%		31	23%
0470	109	11	10.1%		18		57%		178		133	75%		45	25%		101	76%		32	24%
0503	78	4	5.1%		16		68%		171		142	83%		29	17%		117	82%		25	18%
0507	15	1	6.7%		9		74%		103		92	88%		11	12%		77	83%		15	17%
0584	93	12	12.9%		18		55%		184		132	74%		51	26%		98	74%		34	26%
0588	85	10	11.8%		18		57%		164		122	76%		42	24%		92	75%		31	25%
0590	47	3	6.4%		9		75%		88		76	87%		12	13%		65	86%		11	14%
0637	110	8	7.3%		20		54%		210		156	74%		54	26%		115	72%		41	28%
0639	109	6	5.5%		20		67%		203		166	82%		37	18%		135	81%		30	19%
0647	73	4	5.5%		14		64%		141		112	81%		29	19%		88	80%		23	20%
0803	33	3	9.1%		13		48%		183		121	67%		62	33%		86	71%		35	29%
0808	78	9	11.5%		18		56%		195		143	74%		51	26%		109	76%		35	24%
0810	73	5	6.8%		20		59%		226		171	76%		56	24%		133	78%		38	22%
0811	83	3	3.6%		22		70%		272		228	84%		44	16%		191	84%		37	16%
0812	83	3	3.6%		24		59%		341		257	75%		84	25%		203	78%		53	22%
0813	79	4	5.1%		18		56%		219		159	72%		60	28%		123	77%		37	23%
0814	82	6	7.3%		21		50%		235		159	69%		76	31%		115	72%		44	28%
0815	79	4	5.1%		17		60%		249		185	75%		64	25%		148	80%		37	20%
0816	83	4	4.8%		21		62%		301		221	77%		80	23%		179	80%		42	20%
0817	79	2	2.5%		17		57%		201		148	74%		53	26%		115	77%		33	23%
0818	79	2	2.5%		18		56%		231		167	72%		64	28%		130	77%		37	23%
0819	79	6	7.6%		19		55%		211		154	74%		57	26%		116	75%		37	25%
1506	22	1	4.5%		15		70%		216		187	86%		30	14%		152	81%		35	19%
1507	22	1	4.5%		16		71%		228		196	86%		32	14%		161	83%		35	17%
1508	23	1	4.3%		21		73%		290		252	87%		38	13%		211	83%		41	17%
1509	23	1	4.3%		22		72%		283		241	86%		43	14%		201	83%		40	17%
1510	22	1	4.5%		18		73%		263		235	89%		28	11%		193	82%		42	18%
1511	22	1	4.5%		16		69%		242		203	84%		38	16%		166	82%		37	18%
1512	23	1	4.3%		23		69%		329		275	84%		54	16%		226	82%		49	18%
1513	23	1	4.3%		23		72%		321		275	86%		46	14%		228	83%		46	17%
1514	22	1	4.5%		17		72%		255		221	87%		34	13%		184	83%		37	17%
1515	18	1	5.6%		20		61%		255		192	76%		62	24%		155	80%		37	20%
1516	16	1	6.2%		12		64%		153		117	78%		36	22%		98	83%		20	17%
1517	16	2	12.5%		12		59%		221		117	73%		104	27%		93	80%		24	20%
1518	16	1	6.2%		13		64%		160		125	77%		35	23%		106	82%		19	18%
1519	16	1	6.2%		11		65%		154		118	78%		35	22%		98	83%		20	17%
1520	25	1	4.0%		11		73%		147		124	85%		23	15%		108	86%		17	14%
1521	26	1	3.8%		12		75%		161		136	85%		25	15%		119	88%		17	12%
1522	16	2	12.5%		19		57%		346		191	71%		155	29%		156	81%		36	19%
1523	25	1	4.0%		10		74%		153		127	84%		25	16%		113	88%		15	12%
1524	25	1	4.0%		10		73%		143		120	84%		22	16%		105	86%		16	14%
1525	25	1	4.0%		10		69%		161		130	81%		30	19%		111	85%		19	15%
1526	12	1	8.3%		11		74%		140		121	87%		19	13%		103	85%		18	15%
1527	6	1	16.7%		12		70%		186		154	82%		32	18%		130	85%		23	15%
1528	8	1	12.5%		11		73%		139		119	86%		20	14%		100	85%		19	15%
1529	13	1	7.7%		11		63%		186		135	76%		51	24%		113	83%		23	17%
1530	7	1	14.3%		11		71%		183		150	82%		33	18%		132	87%		18	13%
1532	17	1	5.9%		14		71%		170		141	83%		29	17%		121	85%		20	15%
1533	17	1	5.9%		13		72%		178		146	82%		32	18%		127	87%		19	13%
1534	16	2	12.5%		11		66%		155		116	79%		39	21%		97	84%		19	16%
1535	17	1	5.9%		11		71%		179		141	82%		38	18%		123	87%		18	13%
1536	16	1	6.2%		14		56%		203		142	71%		61	29%		114	80%		29	20%
1537	16	1	6.2%		14		58%		204		143	72%		61	28%		117	82%		26	18%
1538	10	1	10.0%		11		67%		160		132	83%		28	17%		108	82%		24	18%
1576	6	1	16.7%		11		0%		225		162	76%		62	24%		0	0%		162	100%
1820	5	2	40.0%		9		0%		140		123	89%		17	11%		0	0%		123	100%
1821	1	1	100.0%		6		0%		93		80	86%		13	14%		0	0%		80	100%
1822	5	1	20.0%		10		0%		158		119	78%		39	22%		0	0%		119	100%
1823	4	1	25.0%		10		0%		137		108	81%		29	19%		0	0%		108	100%
1824	5	1	20.0%		9		0%		125		113	91%		12	9%		0	0%		113	100%
1825	5	1	20.0%		10		0%		153		134	89%		19	11%		0	0%		134	100%
1826	5	1	20.0%		11		0%		191		154	80%		38	20%		0	0%		154	100%
1827	4	1	25.0%		9		0%		127		104	83%		24	17%		0	0%		104	100%
1828	4	1	25.0%		10		0%		231		113	66%		118	34%		0	0%		113	100%
1829	4	1	25.0%		15		0%		166		128	80%		38	20%		0	0%		128	100%
1830	5	1	20.0%		10		0%		135		115	81%		19	19%		0	0%		115	100%
1831	4	1	25.0%		13		0%		200		164	83%		36	17%		0	0%		164	100%
1832	5	1	20.0%		11		0%		160		141	89%		20	11%		0	0%		141	100%
1931	1	1	100.0%		6		0%		247		56	23%		191	77%		0	0%		56	100%
1932	3	1	33.3%		12		0%		163		122	74%		41	26%		0	0%		122	100%
1933	3	1	33.3%		14		0%		163		139	84%		24	16%		0	0%		139	100%
1934	2	1	50.0%		8		0%		124		103	89%		20	11%		0	0%		103	100%
1936	2	1	50.0%		10		0%		116		102	89%		15	11%		0	0%		102	100%
1938	3	1	33.3%		11		0%		147		122	85%		25	15%		0	0%		122	100%
1939	3	1	33.3%		10		0%		351		111	58%		240	42%		0	0%		111	100%
1940	4	1	25.0%		12		0%		163		145	90%		18	10%		0	0%		145	100%
1941	4	1	25.0%		12		0%		369		178	65%		191	35%		0	0%		178	100%


Ensemble Average:	15.0%		17		60%		209		160	78%		49	22%		123	76%		36	24%
Standard Deviation:	17.7%		10		16%		128		93	10%		62	10%		80	16%		28	16%

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NOAA/Pacific Marine Environmental Laboratory Argo Profiling Floats: Engineering Statistics

Table of Contents

Reliability Statistics

Argos Data Telemetry

NOAA/Pacific Marine Environmental Laboratory
Argo Profiling Floats:
Engineering Statistics