§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
EP0451607A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Satellite signal acquisition system for GPS receiver

Assignee: Pioneer Corp
•
Filing: 1991-03-26
•
Granted: —
•
Expires: 2011-03-26
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract In a GPS receiver for receiving satellite signals from a plurality of GPS satellites with a receiving channel by time-division multiplexing, a satellite signal acquisition system, wherein it is determined whether or not almanac data collected and stored in the GPS receiver is outdated over a predetermined period of time upon supplying power to the GPS receiver, the orbital positions of the GPS satellites are calculated only when the almanac data is determined as being updated before elapsing the predetermined period of time, and then the GPS satellites to acquire are determined in accordance with a resultant of the orbital calculation for providing expeditious acquisition of satellite signals. Further, by selecting a number of GPS satellites in acquisition to be a maximum of receivable GPS satellites, a combination of GPS satellites which yields the least error in positioning, or a combination of GPS satellites which provides the minimum PDOP can be attained.

Inventors

  • 👤 Hitoshi C/O Pioneer Electronic Corporation Ando

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-27 07:58
CPC Classifications
G; G01; G01S; G01S19/00; G01S19/01; G01S19/13; G01S19/24; G01S19/28; G01S19/38; G01S19/39; G01S19/42; G01S19/421; G01S19/426

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 107 words
In a Global Positioning System (GPS) receiver for receiving satellite signals from a plurality of satellites with a receiving channel by time-division multiplexing, a satellite signal acquisition system comprising: determining means for determining, upon supplying power to the GPS receiver, whether or not almanac data collected and stored in the GPS receiver is outdated over a predetermined period of time; calculating means for calculating the orbital position of the satellites based on said collected and stored almanac data only when it is updated within said predetermined period of time; and determining means for determining satellites to acquire in accordance with a resultant calculated by said calculating means.
Claim 2
Dependent Claim 29 words
A satellite signal acquisition system as defined in claim 1, wherein said determining means determines satellites to acquire from the satellite orbiting at the highest elevation angle in order.
Claim 3
Dependent Claim 33 words
A satellite signal acquisition system as defined in claim 2, wherein said determining means determines a number of satellites to acquire on the basis of a minimum of orbiting satellites required for positioning.
Claim 4
Dependent Claim 35 words
A satellite signal acquisition system as defined in claim 2, wherein said determining means determines a number of satellites to acquire on the basis of a maximum of orbiting satellites receivable by the GPS receiver.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Maintenance schedule is calculated for granted US utility patents.

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag