ADSBDecoder: An object of class 'adsbDecoder' object representing a...

Description Usage Fields Methods Examples

Description

R6Class object of class adsbDecoder representing a decoder used to decode ADS-B v2 messages. Provides methods for decoding a single message or a batch. Additionally, it includes methods for transforming hex strings into bits vectors and decoding some individual fields. Decoded messages are returned as lists with each decoded field.

Usage

1

Fields

lastOddPosition

Last ground or airborne position message decoded with decodeGroundPositionMessage or decodeAirbornePositionMessage

lastEvenPosition

Last ground or airborne position message decoded with decodeGroundPositionMessage or decodeAirbornePositionMessage

Methods

hexToBits(hex)

Transform a hexadecimal string into its corresponding bits representation, with higher bits in the first positions.

,

decodeCPR(cprLatEven, cprLonEven, cprLatOdd, cprLonOdd, isAirborne=TRUE)

Decodes a pair of CPR-encoded positions given as longitudes and latitudes, corresponding to a pair of even and odd messages, obtaining the actual positions for both. The isAirborne argument indicates whether or not the CPR-encoded positions correspond to isAirborne position messages or not (ground position messages). The result is given as a vector with the decoded positions for both the even and odd messages, in the following order: even latitude, even longitude, odd latitude, odd longitude.

,

decodeMessage(message)

Decodes a single ADS-B v2 message in the form of a bits vector (higher bits in the first positions). The last even and odd positional messages are cached to decode following positional messages. The following message types are supported: aircraft identification, airborne position, ground position, airborne velocity, and operation status.

,

decodeMessages(messages)

Decodes several ADS-B v2 messages in the form of a list of bits vector (higher bits in the first positions). The following message types are supported: aircraft identification, airborne position, ground position, airborne velocity, and operation status.

Examples

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
# Decode three messages, using both individual decoding and batch decoding. 
# The two first messages contain the airborne position.
# The third one, the aircraft identification

msg0 <- ADSBDecoder$hexToBits("8D40621D58C386435CC412692AD6")
msg1 <- ADSBDecoder$hexToBits("8D40621D58C382D690C8AC2863A7")
msg2 <- ADSBDecoder$hexToBits("8D4840D6202CC371C32CE0576098")

decoded0 <- ADSBDecoder$decodeMessage(msg0)
decoded1 <- ADSBDecoder$decodeMessage(msg1)
decoded2 <- ADSBDecoder$decodeMessage(msg2)

decodedAll <- ADSBDecoder$decodeMessages(list(msg0, msg1, msg2))

openSkies documentation built on April 17, 2021, 9:06 a.m.