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The block v receiver fast acquisition algorithm for the galileo s-band mission
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Gevargiz, J. M. Stephens, S. A. Buu, C. M. Hurd, W. J. Berner, J. B. Aung, M. |
| Copyright Year | 1994 |
| Description | A fast acquisition algorithm for the Galileo suppressed carrier, subcarrier, and data symbol signals under low data rate, signal-to-noise ratio (SNR) and high carrier phase-noise conditions has been developed. The algorithm employs a two-arm fast Fourier transform (FFT) method utilizing both the in-phase and quadrature-phase channels of the carrier. The use of both channels results in an improved SNR in the FFT acquisition, enabling the use of a shorter FFT period over which the carrier instability is expected to be less significant. The use of a two-arm FFT also enables subcarrier and symbol acquisition before carrier acquisition. With the subcarrier and symbol loops locked first, the carrier can be acquired from an even shorter FFT period. Two-arm tracking loops are employed to lock the subcarrier and symbol loops parameter modification to achieve the final (high) loop SNR in the shortest time possible. The fast acquisition algorithm is implemented in the Block V Receiver (BVR). This article describes the complete algorithm design, the extensive computer simulation work done for verification of the design and the analysis, implementation issues in the BVR, and the acquisition times of the algorithm. In the expected case of the Galileo spacecraft at Jupiter orbit insertion PD/No equals 14.6 dB-Hz, R(sym) equals 16 symbols per sec, and the predicted acquisition time of the algorithm (to attain a 0.2-dB degradation from each loop to the output symbol SNR) is 38 sec. |
| File Size | 1453845 |
| Page Count | 32 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19950008213 |
| Archival Resource Key | ark:/13960/t0vq7vs22 |
| Language | English |
| Publisher Date | 1994-08-15 |
| Access Restriction | Open |
| Subject Keyword | Communications And Radar Spacecraft Orbits Ultrahigh Frequencies Data Acquisition Signal To Noise Ratios Galileo Project Receivers Superhigh Frequencies Computerized Simulation Fast Fourier Transformations Jupiter Planet Degradation Deep Space Network Algorithms Satellite Tracking Symbols Signal Processing Orbit Insertion Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
