Problems of data preparation encountered in pulsar measurements
Abstract
Pulsar signals are characterized by extreme regularity in period but by large variations in intensity. Often, in the reception of a pulsar signal, one pulse will carry over into the next and it becomes difficult to distinguish between pulses. This dispersion effect is exacerbated by distortion through the interstellar medium. Thus, to achieve maximum resolution, the receiving band should be made as narrow as possible. In measurements of various pulsar frequencies, however, a wider band is needed. The problem, therefore, is to combine high pulse resolution with sensitivity across a frequency range. A pulsar signal antidistortion device is described, which is designed to help solve the problem. Sixty quadratic demodulators are placed in a filterbank with 60 frequency converters, divided into four analog sections. A specific frequency division is effected for incoming signals, which are then digitized. An external signal is synchronized with the beginning of each pulsar period, which then fades until the beginning of the next period.
- Publication:
-
Kleinheubacher Berichte
- Pub Date:
- 1978
- Bibcode:
- 1978KlBer..21..379S
- Keywords:
-
- Analog Circuits;
- Bandwidth;
- Digital Techniques;
- Pulsars;
- Radio Astronomy;
- Signal Analyzers;
- Electric Filters;
- Periodic Variations;
- Repeaters;
- Astronomy