A frequency domain approach to shuttle PN code acquisition
Abstract
Future communications systems, such as the Space Shuttle Orbiter relay uplink, will use a spread spectrum system in accordance with the ITU Radio Regulations. Such a system will allow less power in any given bandwidth than without spreading, immunity from interference, multiple accessing capability, and simultaneous ranging and communications capability. This paper analyzes the problem of acquiring the delayed transmitted code at the receiver. A method using a pseudonoise (PN) sequence to multiply the information bit stream and spread the information bandwidth is considered. The frequency-domain approach simplifies the analysis and clarifies certain design factors. An extension of a standard radar detection method with postdetection integration is shown to provide a plausible acquisition design. An adaptive energy detector could reduce acquisition time without sacrificing acquisition capability.
- Publication:
-
IEEE Transactions on Communications
- Pub Date:
- 1974
- Bibcode:
- 1974ITCom......713C
- Keywords:
-
- Bandwidth;
- Pseudonoise;
- Radio Filters;
- Signal Encoding;
- Space Shuttle Orbiters;
- Spacecraft Communication;
- Adaptive Filters;
- Bandpass Filters;
- Correlation Detection;
- Frequency Response;
- Low Pass Filters;
- Multichannel Communication;
- Communications and Radar