Airborne data processor
Abstract
Airborne equipment developed for use in the acquisition and recording of both analog and digital data is described. These data are recorded using a single analog magnetic tape transport. A reference frequency, for use in servo-speed control of the ground station tape reproducing machine, is combined with speech using a balanced modulator. Recording of these data is performed using direct techniques. Up to eight channels of analog data, which may require measurement over large bandwidth (up to 20 kilohertz), are time multiplexed at rates which are variable over a wide range. Recording of the multiplexed data is performed using frequency modulation techniques. A highly stable crystal oscillator generates an input clock for a time code generator which provides time-of-day in digital form. Up to 32 channels of analog data, requiring measurement at relatively low bandwidth but at high accuracy, are time multiplexed and converted to digital form using commercially available airborne equipment. The digital output from the above equipment together with that from the time code generator and from up to two digital transducers are multiplexed digitally. The digital data are serialized and converted to a form suitable for recording using the analog tape machine.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- November 1978
- Bibcode:
- 1978STIN...8022659F
- Keywords:
-
- Airborne Equipment;
- Data Processing Equipment;
- Tape Recorders;
- Analog To Digital Converters;
- Analogs;
- Digital Data;
- Frequency Modulation;
- Multiplexing;
- Instrumentation and Photography