Satellite information operation method of GPS device

• US 7,994,978 B2
• Filed: 03/17/2009
• Issued: 08/09/2011
• Est. Priority Date: 12/26/2008
• Status: Active Grant

• Current Assignee: Altek Company Limited
• Original Assignee: Altek Corporation
• Inventors: Chen, Hung-Sheng
• Primary Examiner(s): Tarcza; Thomas
• Assistant Examiner(s): MCGUE, FRANK J
• Application Number:
  US12/405,350
• Publication Number:
  US 20100164793A1
• Time in Patent Office: 875 Days
• Field of Search: 342/357.77
• US Class Current: 342/357.77
• CPC Class Codes: G01S 19/24 Acquisition or tracking or demodulation of signals transmitted by the system synchronisation aspects of direct sequence spread spectrum modulation H04B1/7073

Abstract

A satellite information operation method of a GPS device includes following steps. An antenna module is provided, so as to receive a satellite signal. A signal processing circuit is provided, so as to perform an analog-to-digital conversion on the satellite signal and obtain a plurality of first digital data. A memory with a comparison table stored therein is provided, and the comparison table records corresponding relations between a plurality of second digital data and a plurality of return values. A CPU is provided, which groups the first digital data in sequence by using a bit number of any second digital data in the comparison table, obtains each of the second digital data consistent with each group of first digital data through comparison, and looks up a corresponding return value according to each of the second digital data obtained through comparison to continue the operation according to the obtained return value.

Claims

1. A satellite information operation method of a global positioning system (GPS) device, comprising:

providing a movable antenna module for receiving a satellite signal, the antenna module having a position;

providing a signal processing circuit, so as to perform an analog-to-digital conversion on the satellite signal, and obtain a plurality of first digital data;

providing a look-up memory with a comparison table stored therein, wherein the comparison table records corresponding relations between a plurality of second digital data and a plurality of return values; and

providing a central processing unit (CPU), wherein the CPU groups the first digital data in sequence by using a bit number of any of the second digital data in the comparison table, obtains the second digital data consistent with the grouped first digital data through comparison, looks up corresponding return values according to the obtained second digital data, and determines the position of the antenna module using the obtained return values.

2. The satellite information operation method of a GPS device according to claim 1, wherein the antenna module comprises a patch antenna, a passive band-pass filter, a low noise amplifier (LNA), a mixer, and an intermediate frequency (IF) filter.

3. The satellite information operation method of a GPS device according to claim 1, wherein the memory is a non-volatile memory.

4. The satellite information operation method of a GPS device according to claim 1, wherein the bit number of any of the second digital data in the comparison table is 8 bits.

5. The satellite information operation method of a GPS device according to claim 1, wherein the bit number of any of the second digital data in the comparison table is 16 bits.