| Telemetry or "remote measurement" is a highly | | | | radiosonde, a instrument that automatically measured |
| automated communications process by which | | | | atmospheric temperature, pressure and humidity by |
| measurements are made and other data collected at | | | | means of a small, expendable telemetry transmitter |
| remote, inaccessible or dangerous places, and then | | | | from a balloon high in space, and relayed the data |
| relayed by a telemetry transmitter to receiving stations | | | | back to Earth using radio signals. These days, |
| for display, monitoring, and recording. The original | | | | telemetry is used in testing of moving vehicles such as |
| telemetry systems were termed "supervisory" | | | | cars, aircrafts, missiles and satellites. National |
| because they were used to monitor electric power | | | | Aeronautics and Space Administration (NASA), |
| distribution. Communication channels form a major part | | | | European Space Agency (ESA) and other international |
| of any telemetry system, as it involves measurement | | | | space agencies use telemetry transmitters for data |
| of the transmission of data over various mediums. | | | | collection and transmission from orbiting spacecrafts |
| Telemetry transmitter is the instrument used for | | | | and satellites. |
| recording the readings of an instrument and | | | | Wireless networking without the encumbrance and |
| transmitting them by radio or wireless frequencies. | | | | restriction of wires connecting the transmitter and |
| Technically, when relaying data, it is necessary for the | | | | receiver has catapulted the potential applications of |
| transmitter to identify the data item corresponding to | | | | telemetry. Major applications of telemetry includes |
| each segment of the bit stream. This is done by | | | | automatic monitoring of large, complex systems such |
| inserting a synchronization bit string into the telemetry | | | | as satellites, chemical plants, oilrigs, electric power |
| stream on a regular basis, usually at the beginning or | | | | plants, gathering meteorological data, remote meter |
| end of each repeating cycle. This generally | | | | reading, logistics management, tracking endangered |
| corresponds to the beginning or end of a minor or | | | | land and marine species, real time physiological |
| major frame of telemetry data. | | | | monitoring of patients, and monitoring manned and |
| Aerospace telemetry initiated in the 1930s with the | | | | unmanned space flights. |