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Self-calibrating threshold detector
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Barnes, J. R. |
| Copyright Year | 1980 |
| Description | A self calibrating threshold detector comprises a single demodulating channel which includes a mixer having one input receiving the incoming signal and another input receiving a local replica code. During a short time interval, an incorrect local code is applied to the mixer to incorrectly demodulate the incoming signal and to provide a reference level that calibrates the noise propagating through the channel. A sample and hold circuit is coupled to the channel for storing a sample of the reference level. During a relatively long time interval, the correct replica code provides an output level which ranges between the reference level and a maximum level that represents incoming signal presence and synchronism with the replica code. A summer substracts the stored sample reference from the output level to provide a resultant difference signal indicative of the acquisition of the expected signal. |
| File Size | 625332 |
| Page Count | 7 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19810010900 |
| Archival Resource Key | ark:/13960/t0xq1t51f |
| Language | English |
| Publisher Date | 1980-12-23 |
| Access Restriction | Open |
| Subject Keyword | Signal Mixing Signal Encoding Signal To Noise Ratios Demodulators Signal Detectors Receivers Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Patent |
