Signal processing method for a GPS receiver

• US 5,329,549 A
• Filed: 08/02/1993
• Issued: 07/12/1994
• Est. Priority Date: 08/05/1992
• Status: Expired due to Term

• Current Assignee: Pioneer Electronics (USA) Incorporated (Pioneer Corporation)
• Original Assignee: Pioneer Electronics (USA) Incorporated (Pioneer Corporation)
• Inventors: Kawasaki, Kenichiro
• Primary Examiner(s): Barron, Jr., Gilberto
• Application Number:
  US08/100,143
• Time in Patent Office: 344 Days
• Field of Search: 375/1, 375/115
• US Class Current: 375/150
• CPC Class Codes: G01S 19/29 carrier including Doppler, related G01S19/246 takes precedence
• CPC Class Codes: H04B 1/7085 using a code tracking loop, e.g. a delay-locked loop

Abstract

A method for searching a carrier frequency and code phase of a signal received by a GPS receiver. The method includes steps of: quantizing the received signal; sampling the quantized signal at a first speed by a carrier frequency generated in the receiver; storing the samples in memory at a first speed; reading the samples from memory at a second speed; and determining the correlation between a code of the carrier frequency generated in the receiver and the received signal. The second speed is faster than the first speed.

Claims

1. A method for searching a carrier frequency and code phase of a signal received by a GPS receiver, comprising steps of:

quantizing the received signal;

sampling the quantized signal at a first speed by a carrier frequency generated in the receiver;

storing the samples in a memory at said first speed;

reading the samples from the memory at a second speed faster than said first speed; and

determining a correlation between a code of the received signal from the samples read from the memory and a code generated in the receiver.

2. A method for searching a carrier frequency and code phase according to claim 1, wherein said second speed is ten times faster than said first speed.