Automatic calibration device for direct spectrum spread receiver
US5029181A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 1990 |
| Grant date | Jul 2, 1991 |
| Priority date | — |
| Expiry date | Oct 25, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/7085
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A simulated reception signal is produced by modulating an AC signal having the same frequency as the reception frequency with a modulating signal produced using two pseudo noise codes delayed by 1/2 or 3 chips. In a calibrating mode, in which the simulated reception signal is chosen, a reference voltage to a comparator for synchronization detection and an output voltage of a differential amplifier for synchronization holding are stored in a CPU. In a receiving mode, in which an actual reception signal is chosen, the CPU controls the comparator and a pseudo noise generator which is included in a delay lock loop on the basis of the stored data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.