Direct acquistion of very large PN sequences in GPS systems
US6369752B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 12, 2000 |
| Grant date | Apr 9, 2002 |
| Priority date | — |
| Expiry date | Jun 12, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2201/70715
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A receiver and method for acquiring a large pseudorandom (PN) sequence such as a GPS P(Y) code signal with poor or no knowledge of an external time reference are disclosed. A reference PN sequence is sectioned into a predetermined number of subsequences. The large PN sequence to be acquired is received from a remote source. The received PN sequence is correlated with each of the predetermined number of subsequences simultaneously. The large PN sequence is acquired, and a GPS solution may be provided, in the event the correlation produces a correlation between the received PN sequence and one of the predetermined number of subsequences. The large PN sequence may acquired without knowledge of an external time reference in a reasonable amount of time (e.g., less than ten minutes).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.