GNSS RECEIVER

• US 20100245170A1
• Filed: 12/22/2008
• Published: 09/30/2010
• Est. Priority Date: 12/21/2007
• Status: Abandoned Application

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Brenner, Joel
• Application Number:
  US12/744,023
• Publication Number:
  US 20100245170A1
• Time in Patent Office: Days
• US Class Current: 342/357.250
• CPC Class Codes: G01S 19/09 providing processing capability normally carried out by the receiver
• CPC Class Codes: G01S 19/37 Hardware or software details of the signal processing chain

Abstract

A GNSS receiver interfaceable to a host, in which the search functions in the acquisition phase are carried out by the host'"'"'s resources. The receiver provides correlation samples to the host system by a dedicated high-speed interface, preferably a DMA interface.

Claims

1. A GNSS receiver interfaceable with a host (300) comprising an acquisition engine (100) having a correlation unit providing a plurality of correlation samples and a data transfer interface (75) operatively arranged to transfer the correlation samples to the host system (300).

2. The GNSS receiver of the preceding claim, wherein the data transfer interface (75) includes a dedicated high speed unidirectional DMA system to transfer the correlation samples from the GNSS receiver into the memory of the host (300).

3. The GNSS system of any of the preceding claims, further comprising a tracking unit (200), operatively arranged to track a number of GNSS signals by their values of Doppler shift and code shift, and to provide ranging measurements to the host system.

4. The GNSS receiver of claim 3, wherein the tracking unit (200) is operatively arranged to transfer correlation data to the host system (300) by the data transfer interface.

5. The GNSS receiver of any of the previous claims, wherein the data transfer interface transfers the data to the host in the same order in which it has received them.

6. The GNSS receiver of any of the preceding claims, in combination with an host system (300) interfaced thereto, wherein the host system is operatively arranged to perform DFT and/or FFT operations on the correlation samples of the GNSS receiver to obtain integration values for a plurality of correlation taps corresponding to a plurality of Doppler shift and code shift values.

7. The GNSS receiver of the preceding claim, in which the host system (300) further comprises a hardware acceleration unit (130).

8. The GNSS receiver of the preceding claim, in which the hardware acceleration unit (130) consists in a Graphic Processing Unit.

9. The GNSS receiver of the any of the claims 6-7, wherein the host system is operatively arranged to time-integrate said correlation taps.

10. The GNSS receiver of the preceding claim, wherein the host system is operatively arranged to compute the absolute value or the square of the time-integrated correlation taps, and or to integrate said absolute values or square values providing a incoherent accumulated value.

11. The GNSS receiver of any of the claims 6-10, the host system being operatively arranged to search for correlation peaks corresponding to a GNSS signal having a Doppler shift and a code shift.

12. The GNSS receiver of any of the claims 6-11, the host system being a personal computer, a laptop, a PDA a mobile communication device or a mobile phone.