Argus Radar - SERIAL INTERFACE SPECIFICATIONS
988-10187-004 2.8
TTD – Tracked target data
This sentence is used to transmit tracked radar targets in a compressed format. This
enables the transfer of many targets with minimum overhead. New target labels are defined
by the TLB sentence to reduce bandwidth use. Transmission of up to four targets in the
same sentence is possible.
!--TTD,hh,hh,x,s—s,x*hh<CR><LF>
Number of fill-bits, 0 to 5 (see Note 4)
Encapsulated tracked target data (see Note 3)
Sequential message identifier, 0 to 9 (see Note2)
Hex sentence number, 1 to FF (see Note 1)
Total hex number of sentences needed to transfer
the message, 1 to FF (se Note 1)
NOTE 1
The transfer of all tracked targets may require the transmission of multiple
sentences. The first field specifies the total number of sentences used for a
message, minimum value 1. The second field identifies the order of this
sentence in the message, minimum value 1. These cannot be null fields.
NOTE 2
The sequential message identifier provides a message identification number
from 0 to 9 that is sequentially assigned and is incremented for each new
multi-sentence message. The count resets to 0 after 9 is used. For a
message requiring multiple sentences, each sentence of the message
contains the same sequential message identification number. It is used to
identify the sentences containing portions of the same message. This allows
for the possibility that other sentences might be interleaved with the
message sentences that, taken collectively, contain a single message. This
should be a null field for messages that fit into one sentence.
NOTE 3
The tracked target data structure is described below. One sentence may
contain from one up to four structures of 15 characters in the same
sentence. This field supports a maximum of 60 valid characters for
messages transferred using multiple sentences.
NOTE 4
This cannot be a null field. See “x4” in description of encapsulation
sentences in IEC 61162-1.Every target (tracked or AIS) is packed according
to the structure below. Data is stored most significant bit first. Every
message character is converted into six bits. The structure is encapsulated
as 15 characters. The sentence may contain from one to four targets.
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