Automatic vehicle guidance systems
US4010409A · kind A · utility
35Cited by
4References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 31, 1973 |
| Grant date | Mar 1, 1977 |
| Priority date | — |
| Expiry date | Jul 31, 1993 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D1/0265
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
In a frequency selective steering system for automatic vehicle guidance, a phase locked loop is used to derive from a sum signal containing wanted and unwanted signal frequencies a reference signal equal in phase and frequency to the wanted signal. The reference signal is used to derive from a difference signal also containing wanted and unwanted signal frequencies an error signal dependent on the phase of the wanted signal only. The error signal is used to control the steering of the vehicle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.