Loading...
Please wait, while we are loading the content...
Similar Documents
Discriminator aided phase lock acquisition for suppressed carrier signals
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Carson, L. M. |
| Copyright Year | 1982 |
| Description | A discriminator aided technique for acquisition of phase lock to a suppressed carrier signal utilizes a Costas loop which is initially operated open loop and control voltage for its VCXO is derived from a phase detector that compares the VCXO to a reference frequency thus establishing coarse frequency resolution with the received signal. Then the Costas loop is closed with the low-pass filter of the channel having a bandwidth much greater (by a factor of about 10) than in the I channel so that a frequency discriminator effect results to aid carrier resolution. Finally, after carrier acquisition, the Q-channel filter of the Costas loop is switched to a bandwidth substantially equal to that of the I-channel for carrier tracking. |
| File Size | 463916 |
| Page Count | 6 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19820021663 |
| Archival Resource Key | ark:/13960/t6zw68p33 |
| Language | English |
| Publisher Date | 1982-06-22 |
| Access Restriction | Open |
| Subject Keyword | Electronics And Electrical Engineering Phase Locked Systems Low Pass Filters Signal To Noise Ratios Modulation Bandwidth Signal Processing Discriminators Limiter Circuits Carrier Frequencies Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Patent |
