The High Explosive Radio Telemetry (HERT) is a telemetry system that utilizes a novel polar differential 16-QAM to achieve a maximum data rate of 100Mbps during a destructive event. Sixty-four channels of nearly simultaneous events are captured and timed with 10-nanosecond resolution. All data is initially transmitted in less than 20 microseconds. Data redundancy and error detection is included in the encoding format. The main telemetry module is approximately 13 cubic inches in size and has optical inputs. It consumes about 5 watts of input power. A modular 10-watt transmitter is attached which is operated in pulse mode. Though HERT has successfully taken data in close proximity to an explosive event, data has never been collected in HERTs intended environment-a speeding, rotating, exoatmoshpheric re-entry flight vehicle. Recent tests have been performed at Kwajalein Pacific test range to verify theoretical data. This paper will discuss some background on the HERT system, the 16- QAM constellation, and the results of the test, including a comparison of simulation and flight test data.
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