Low Cost Telemetry Encoder

In the past all the data on sounding rocket missions was collected by a voltage meter, then that data was sent somewhere to be turned into digital data that can be analyzed. So some people at USU decided to develop a machine that would change the voltage read out into digital data before it was sent. Then after they got that to work, they decided to get the machine to do something better to it. That worked really well and they were approached by NASA. At the time NASA was spending $30-40,000 to do all of that stuff to their data, so they offered USU $5,000 for a generic design of their machine. And so we see that they all lived happily ever after.

Diagram of the LCTE process.

Word size: 8-16 bits
Bit rate: .650-4000 kbps
Matrix size: 0-4096 data words
Matrix dimensions: 1-255 rows and 2-255 columns
Frame sync words: 1 or 2, 16-bit words
Encoding: RNRZ-L or BiPhase-L
Analog inputs: 32
Analog acquisition: adjustable, 2.75 µseconds or greater
Digital lines: 32, configured as input or output in groups of 8
Digital input function: 8-bit parallel, synchronous serial, or time event
Digital output function: synchronous serial controls
Asynchronous serial input: 2400-115200 baud
Backplane input: 255 channels

LCTE stack(left) and the LCTE finished product.


Implementation of a User-configurable Low Cost Telemetry Encoder
Jeffrey A. Henry (2004)

Low-Cost Telemetry Encoder Backplane Communication
Timothy B. Campbell (2006)