Acas Capability Provides A Means For Achieving
Acas Capability Provides A Means For Controlling
Acas Capability Provides A Means Formal

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Mode S Elementary Surveillance (ELS) provides a set of basic functionalities that are supported by the Mode S transponders. These basic functionalities include the reporting of aircraft identity, altitude, transponder capability, and flight status. The set of BDS codes included in ELS are 1,0, 1,7, 2,0, and 3,0.

Data link capability report (BDS 1,0)

This message is designed to report the data link capability of the Mode S transponder installed. In Table 1.1, all fields in this report are shown.

Data link capability report (BDS 1,0), MB field
FIELD	MSG	MB	BITS
BDS Code [0001 0000]	33-40	1-8	8
Configuration flag	41	9	1
Reserved [00000]	42-46	10-14	6
Overlay Command Capability (OCC)	47	15	1
Reserved for ACAS	48	16	1
Mode S subnetwork version number	49-55	17-23	7
Transponder enhanced protocol indicator	56	24	1
Mode S specific services capability	57	25	1
Uplink ELM average throughput capacity	58-60	26-28	3
Downlink ELM throughput	61-64	29-32	4
Aircraft identification capability	65	33	1
Squitter capability subfield (SCS)	66	34	1
Surveillance identifier code (SIC)	67	35	1
Common usage GICB capability report	68	36	1
Reserved for ACAS	69-72	37-40	4
Data terminal equipment (DTE) status	73-80	41-56	16

In the data link capability report, the first eight bits indicate the BDS number 1,0, which is 0001 0000 in binary format. The definitions of the other fields are:

1) ACAS related bits are shown as follows:

2) Valid values for Mode S subnetwork version number are from 0 to 5, corresponds to compliance to a different version of ICAO documentations. Numbers 6 to 127 are currently unassigned. Numbers 0 to 5 can be interpreted:

3) Overlay Command Capability indicated whether the transponder supports BDS overlay (Data Parity).

4) When Transponder enhanced protocol indicator bit is set to , the transponder is a Level 5 transponder. Value indicates a Level 2 to 4 transponder.

5) When Mode S specific services capability bit is set to , at least one Mode S specific service is supported.¹.

Acas Capability Provides A Means For Achieving

6) Aircraft identification capability indicates availability of identification.

7) When Squitter capability subfield bit is set to , both BDS 0,5 and 0,6 registers have been updated in the past 9 to 11 seconds.

8) Surveillance identifier code determines whether the transponder has the surveillance identification code capability.

9) Common usage GICB capability report is set to every time the GICB capacity report (BDS code 1,7) is changed. Register 1,7 is sampled every minute to check for changes.

Common usage GICB capability report (BDS 1,7)

This message is designed to report Common Usage Ground-initiated Comm-B (GICB) capabilities. The fields in this report are shown in Table 1.2. In this table, each bit indicates whether the corresponding service is available from the transponder.

A bit is set to when the corresponding register has a valid input that has been updated with the required rate. This means that the same aircraft would respond with different GICB reports due to the availability of the source data.

Common usage GICB capability report (BDS 1,0), MB field
FIELD	MSG	MB	BITS
0,5 Extended squitter airborne position	33	1	1
0,6 Extended squitter surface position	34	2	1
0,7 Extended squitter status	35	3	1
0,8 Extended squitter identification and category	36	4	1
0,9 Extended squitter airborne velocity information	37	5	1
0,A Extended squitter event-driven information	38	6	1
2,0 Aircraft identification	39	7	1
2,1 Aircraft registration number	40	8	1
4,0 Selected vertical intention	41	9	1
4,1 Next waypoint identifier	42	10	1
4,2 Next waypoint position	43	11	1
4,3 Next waypoint information	44	12	1
4,4 Meteorological routine report	45	13	1
4,5 Meteorological hazard report	46	14	1
4.8 VHF channel report	47	15	1
5,0 Track and turn report	48	16	1
5,1 Position coarse	49	17	1
5,2 Position fine	50	18	1
5,3 Air-referenced state vector	51	19	1
5,4 Waypoint 1	52	20	1
5,5 Waypoint 2	53	21	1
5,6 Waypoint 3	54	22	1
5,F Quasi-static parameter monitoring	55	23	1
6,0 Heading and speed report	56	24	1
Reserved for aircraft capability	57	25	1
Reserved for aircraft capability	58	26	1
E,1 Reserved for Mode S BITE (Built In Test Equipment)	59	27	1
E,2 Reserved for Mode S BITE (Built In Test Equipment)	60	28	1
F,1 Military applications	61	29	1
Reserved	62-80	30-56	17

We can use the following message as an example:

From the MB field, we can identify that following bits are set to :

Hence, BDS codes supported by the transponder are:

Try it out Using pyModeS, we can decode the GICB information as:

A list of supporting BDS code will be returned.

Aircraft identification (BDS 2,0)

Similar to an ADS-B aircraft identification message, the callsign of an aircraft can be decoded from BDS 2,0 messages. The structure of the MB field is defined in Table 1.3.

Aircraft identification (BDS 2,0), MB field
FIELD	MSG	MB	BITS
BDS Code [0010 0000]	33-40	1-8	8
Character 1	41-46	9-14	6