程序包 net.sf.marineapi.nmea.sentence

接口 AISSentence

所有超级接口:
Sentence
public interface AISSentence extends Sentence

Base interface for all AIS sentences (Automatic Identification System). Notice that "AIS" does not refer to NMEA sentence type, but another system/standard that transmits it's messages using NMEA 0183.

AIS sentences are parsed in two phases and they all share the same NMEA sentence layout, so there is no dedicated interfaces for each AIS sentence type (VDM, VDO etc).

Example:
!AIVDM,1,1,,B,177KQJ5000G?tO`K>RA1wUbN0TKH,0*5C

作者:
Lázár József, Kimmo Tuukkanen

  • 方法详细资料

    • getNumberOfFragments

      int getNumberOfFragments()
      Number of fragments in the currently accumulating message.
      返回:
      number of fragments.

    • getFragmentNumber

      int getFragmentNumber()
      Returns the fragment number of this sentence (1-based).
      返回:
      fragment index

    • getMessageId

      String getMessageId()
      Returns the sequential message ID for multi-sentence messages.
      返回:
      sequential message ID

    • getRadioChannel

      String getRadioChannel()
      Returns the radio channel information of the messsage.
      返回:
      radio channel id

    • getPayload

      String getPayload()
      Returns the raw 6-bit decoded message.
      返回:
      message body

    • getFillBits

      int getFillBits()
      Returns the number of fill bits required to pad the data payload to a 6 bit boundary, ranging from 0 to 5. Equivalently, subtracting 5 from this tells how many least significant bits of the last 6-bit nibble in the data payload should be ignored.
      返回:
      number of fill bits

    • isFragmented

      boolean isFragmented()
      Tells if the AIS message is being delivered over multiple sentences.
      返回:
      true if this sentence is part of a sequence

    • isFirstFragment

      boolean isFirstFragment()
      Tells if this is the first fragment in message sequence.
      返回:
      true if first fragment in sequence

    • isLastFragment

      boolean isLastFragment()
      Tells if this is the last fragment in message sequence.
      返回:
      true if last part of a sequence

    • isPartOfMessage

      boolean isPartOfMessage(AISSentence sentence)

      Tells if given sentence is part of message sequence.

      Sentences are considered to belong in same sequence when the given sentence meets the following conditions:

      • Same number of fragments, higher fragment #, same channel and same message id
      • Same number of fragments, next fragment #, and either same channel or same message id
      参数:
      sentence - AISSentence to compare with.
      返回:
      true if this and given sentence belong in same sequence