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by: Brandon Douglas


Brandon Douglas
GPA 3.75


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Class Notes
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This 2 page Class Notes was uploaded by Brandon Douglas on Friday September 18, 2015. The Class Notes belongs to EEL 5666 at University of Florida taught by Staff in Fall. Since its upload, it has received 17 views. For similar materials see /class/206834/eel-5666-university-of-florida in Electrical Engineering at University of Florida.

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Date Created: 09/18/15
GPS Packet Structure The Lassen iQ GPS Receiver uses a proprietary communicates via serial communication The serial stream of data from the receiver is broken into bytes that form packets of varying length which can be decoded into a command with data The receiver uses a proprietary packet structure which was developed by the manufacturer called Trimble Standard Interface Protocol TSIP According to the datasheet the packet structure is as follows TSIP packet structure is the same for both commands and reports The packet format is ltDLEgt ltidgt ltdata string bytesgt ltDLEgt ltETXgt Where ltDLEgt is the byte 0x10 ltETXgt is the byte 0x03 ltidgt is a packet identifier byte which can have any value excepting ltETXgt and ltDLEgt The bytes in the data string can have any value To prevent confusion with the frame sequences ltDLEgt ltIDgt and ltDLEgt ltETXgt every ltDLEgt byte in the data string is preceded by an extra ltDLEgt byte 39stuffing These extra ltDLEgt bytes must be added stuffed before sending a packet and removed after receiving the packet Notice that a simple ltDLEgt ltETXgt sequence does not necessarily signify the end of the packet as these can be bytes in the middle of a data string The end of a packet is ltETXgt preceded by an odd number of ltDLEgt bytes Multiplebyte numbers integer oat and double follow the ANSIIEEE Std 754 IEEE Standard for binary FloatingPoint Arithmetic They are sent mostsignificant byte first This may involve switching the order of the bytes as they are normally stored in Intel based machines Specifically UINT8 Byte An 8 bit unsigned integer UINTl6 Word A 16 bit unsigned integer INTl6 Integer A 16 bit integer INT32 Long A 32 bit integer UINT32 ULong A 32 bit unsigned integer Single Float or 4 byte REAL has a precision of 24 significant bits roughly 65 digits Double 8 byte REAL has a precision of 52 significant bits It is a little better than 15 digits Lassen 87 The following pages reference packets which were recorded during a capture of all output from the GPS receiver in the early morning of July 12 2005 Due to the amount of data recorded only the excerpts are presented here Please contact the author for a digital copy of the complete data capture


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