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At least 775 records · Page 43
All sourcesNASA NTRSDOE OSTI
NASA NTRS1969

Data processing method for a weak, moving telemetry signal

Method of processing data from a spacecraft, where the carrier has a low signal-to-noise ratio and wide unpredictable frequency shifts, consists of analogue recording of the noisy signal along with a high-frequency tone that is used as a clock to trigger a digitizer.

Kendall, W. B.↗
NASA NTRS1971

Digital telemetry system eliminates data redundancy

Floating aperature, zero-order predictor /ZOP/ circuit eliminates telemetered data redundancy by examining data from each sensor before it is multiplexed and transmitted. Digital devices to implement design are off-the-shelf items such as gates, registers and flip-flops, which are readily amenable to large-scale integration techniques.

Hymer, R. L.↗
NASA NTRS1971

An improved telemetry system

Transmission of parity bits together with data bits by a rate one half convolutional code of 25-bit constraint length, with sequential decoding of received signal increases quantity and accuracy of data transmitted by pulse code modulated system operating at given power level.

Lumb, D. R.↗
NASA NTRS1971

High efficiency telemetry method

Analog and digital mechanizations contain new combinations of known circuits that generate coefficients of Fourier series terms in accordance with harmonic content of waveform to be transmitted. Technique represents information signal more accurately that previous methods and requires fewer information bits.

Lim, L. Y.↗
NASA NTRS1972

Technique minimizes the effects of dropouts on telemetry records

Recorder deficiencies are minimized by using two-channel system to prepare two tapes, each having noise, wow and flutter, and dropout characteristics of channel on which it was made. Processing tapes by computer and combining signals from two channels produce single tape free of dropouts caused by recording process.

Anderson, T. O.↗
NASA NTRS1971

Bio-medical telemetry: Sensing and transmitting biological information from animals to man

The application of small radio transmitters for monitoring biological activity in animals and humans is discussed. The microminiaturization of the electronic transmitters makes it possible for them to be swallowed and to operate within the body with no external connections. The small size also makes it possible for the transmitters to be surgically implanted or carried externally to monitor specific bodily functions. The use of satellites to monitor the activity of birds and animals carrying small transmitters is described. Photographs of birds, fish, and reptiles which were equipped with miniature electronic monitors are provided.

Mackay, S.↗
NASA NTRS1972

Satellite relay telemetry in the surveillance of active volcanoes and major fault zones

A review was made of efforts to develop a dense telemetered microearthquake network to study earthquake mechanics along the San Andreas fault and the strain mechanics of the Kilauea Volcano. The principle elements and objectives of the ERTS-A proposal are outlined. Some of the aspects of the earthquake network and the results obtained from it as well as some promising experiments in computerized record processing are discussed.

Eaton, J. P.↗
NASA NTRS1971

Frame synchronization in PCM telemetry.

The frame synchronization performance characteristics are defined that can be measured under actual operating conditions. The frame synchronization process is explained, and test data on the performance of frame synchronizers and frame synchronization codes are presented. The application of frame synchronization methods in specific cases is considered in the light of code selection, frame length, and data recovery.

Peavey, B.↗
NASA NTRS1971

Bio-medical telemetry - Sensing and transmitting biological information from animals and man.

Several examples are presented of radio transmitters swallowed, surgically implanted, or carried externally to study animal and human objects with minimum disturbance to normal activity patterns. Particular attention is given to the method of using satellite-borne receivers for determining the position of animals or other objects carrying fixed-frequency transmitters. The design and operation of the instrumentation necessary for this purpose are described.

Mackay, S.↗