Receiver applying channel selection filter for receiving satellite signal and receiving method thereof

• US 8,412,093 B2
• Filed: 10/22/2008
• Issued: 04/02/2013
• Est. Priority Date: 10/22/2008
• Status: Active Grant

• Current Assignee: MediaTek, Inc.
• Original Assignee: MediaTek, Inc.
• Inventors: Liu, Chieh-Chao, Ou-Yang, Cheng-Yi, Wu, Pao-Lin
• Primary Examiner(s): NGUYEN, HAI V
• Application Number:
  US12/256,464
• Publication Number:
  US 20100099351A1
• Time in Patent Office: 1,623 Days
• Field of Search: 455/3.02
• US Class Current: 455/3.02
• CPC Class Codes: G01S 19/21 Interference related issues ; Issues related to cross-correlation, spoofing or other methods of denial of service
• CPC Class Codes: G01S 19/33 Multimode operation in different systems which transmit time stamped messages, e.g. GPS/GLONASS
• CPC Class Codes: G01S 19/36 relating to the receiver frond end
• CPC Class Codes: H04B 1/406 with more than one transmission mode, e.g. analog and digital modes

Abstract

A satellite receiver for receiving at least a target satellite signal includes a channel selection filter and a controller. The channel selection filter is provided with a plurality of channel selection settings conforming to characteristics of a plurality of satellite signals corresponding to different satellite systems, wherein each of the channel selection settings is to receive at least one of the satellite signals. The controller controls the channel selection filter to enable a target channel selection setting selected from the channel selection settings to thereby receive at least the target satellite signal.

Claims

1. An apparatus for receiving at least a target satellite signal, comprising:

a channel selection filter of an RF front-end module, comprising a plurality of channel selection settings conforming to characteristics of a plurality of satellite signals corresponding to different satellite systems, wherein each of the channel selection settings is for receiving at least one of the satellite signals; and

a controller, coupled to the channel selection filter, for controlling the channel selection filter to enable a target channel selection setting selected from the channel selection settings to thereby receive at least the target satellite signal.

2. The apparatus of claim 1, wherein the bandwidths of the plurality of satellite signals are overlapped.

3. The apparatus of claim 1, wherein the controller determines signal qualities of the satellite signals, and controls the channel selection filter to enable the target channel selection setting according to the signal qualities of the satellite signals.

4. The apparatus of claim 1, wherein the channel selection settings are configured the channel selection filter to have an identical pass band but different central frequencies.

5. The apparatus of claim 1, further comprising:

a plurality of correlator channels, coupled to the channel selection filter and the controller, for processing the satellite signals respectively;

wherein the controller further turns off at least one correlator channel not corresponding to the target satellite signal.

6. The apparatus of claim 5, wherein the controller further turns on the correlator channels after the correlator channels are turned off, determines signal qualities of the satellite signals, and then selectively changes the target channel selection setting according to the signal qualities.

7. The apparatus of claim 6, wherein the controller turns on and turns off the correlator channels alternately until the target channel selection setting is changed.

8. The apparatus of claim 1, wherein the target satellite signal includes a plurality of lobes;

and the controller further determines signal qualities of the lobes, and controls the channel selection filter to enable the target channel selection setting for selecting one of the lobes according to the signal qualities of the lobes.

9. A method of receiving at least a target satellite signal, comprising:

providing a plurality of channel selection settings conforming to characteristics of a plurality of satellite signals corresponding to different satellite systems, wherein the plurality of channel selection settings are used to setting a channel selection filter of an RF front-end module, and each of the channel selection settings is for receiving at least one of the satellite signals; and

enabling a target channel selection setting selected from the channel selection settings to thereby receive at least the target satellite signal.

10. The method of claim 9, wherein the bandwidths of the plurality of satellite signals are overlapped.

11. The method of claim 9, wherein the step of enabling a target channel selection setting comprises determining signal qualities of the satellite signals, and enabling the target channel selection setting according to the signal qualities of the satellite signals.

12. The method of claim 9, wherein the channel selection settings are further configured to change central frequencies.

13. The method of claim 9, further comprising:

correlating the satellite signals by a plurality of correlator channels respectively;

wherein the method further comprises turning off at least one correlator channels not corresponding to the target satellite signal.

14. The method of claim 13, further comprising turning on the correlator channels after the correlator channels are turned off, determining signal qualities of the satellite signals, and then selectively changing the target channel selection setting according to the signal qualities.

15. The method of claim 14, wherein the steps of turning on and turning off the correlator channels are performed alternately until the target channel selection setting is changed.

16. The method of claim 9, wherein the target satellite signal includes a plurality of lobes;

and the method further comprises determining signal qualities of the lobes, and enabling the target channel selection setting for selecting one of the lobes according to the signal qualities of the lobes.