GPS receiver and portable communication apparatus

• US 6,466,163 B2
• Filed: 01/29/2001
• Issued: 10/15/2002
• Est. Priority Date: 01/31/2000
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Hasegawa, Koji, Naruse, Tetsuya, Teranishi, Koichiro, Hori, Katsuya
• Primary Examiner(s): Issing, Gregory C.
• Application Number:
  US09/771,905
• Publication Number:
  US 20010020912A1
• Time in Patent Office: 624 Days
• Field of Search: 342/357.1, 342/357.12, 342/357.02, 455/78
• US Class Current: 342/357.59
• 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 19/25 involving aiding data received from a cooperating element, e.g. assisted GPS
• CPC Class Codes: H04B 1/109 by improving strong signal performance of the receiver when strong unwanted signals are present at the receiver input
• CPC Class Codes: H04B 1/3805 with built-in auxiliary receivers

Abstract

A GPS receiver and a portable communication apparatus with the timing of demodulation of a GPS received signal received from a satellite in the global positioning system being controlled in accordance with the timing of transmission of a CDMA transmission signal to a base station in a predetermined communication system, so that the GPS received signal can be accurately demodulated, thereby preventing radio waves that occur during transmission of the CDMA transmission signal from interfering with the GPS received signal. Thus, the GPS received signal can be demodulated without deterioration of reception quality.

Claims

1. A GPS receiver, comprising:

transmission timing means for providing transmission timing of a transmission signal to a base station in a predetermined communication system;

demodulating means for receiving a satellite signal from a GPS satellite and for demodulating said satellite signal received; and

demodulation control means for controlling demodulation timing of said demodulating of said satellite signal in accordance with said transmission timing from said transmission timing means.

2. The GPS receiver according to claim 1, wherein said demodulation control means controls said demodulating of said satellite signal such that demodulation occurs when said transmission signal is not transmitted based on said transmission timing.

3. The GPS receiver according to claim 1, wherein said demodulation control means controls said demodulating of said satellite signal such that demodulation occurs before continuously transmitting said transmission signal based on said transmission timing.

4. The GPS receiver according to claim 1, wherein said demodulation control means controls said demodulating of said satellite signal such that demodulation occurs before continuously transmitting said transmission signal and when said transmission signal is not intermittently transmitted based on said transmission timing.

5. The GPS receiver according to claim 1, further comprising:

demodulation timing informing means for informing said demodulating means of said demodulation timing to be used by said demodulating means; and

transmission control means for controlling said transmission timing to transmit said transmission signal to said base station in said predetermined communication system in accordance with said demodulation timing from said demodulation timing informing means.

6. The GPS receiver according to claim 5, wherein said transmission control means delays said transmission timing of said transmission signal to be transmitted to said base station in said predetermined communication system until a result of said demodulation is obtained by said demodulating means in accordance with said demodulation timing.

7. The GPS receiver according to claim 1, wherein said transmission signal is a line connection request signal to said base station in said communication system.

8. The GPS receiver according to claim 1, wherein said transmission signal is transmitted in a form of transmission packets containing a predetermined amount of data, and

said demodulation control means demodulates said satellite signal when said transmission packets are not transmitted.

9. The GPS receiver according to claim 1, wherein said communication system is a Code Division Multiple Access (CDMA) cellular system.

10. The GPS receiver according to claim 1, wherein said communication system is a Time Division Multiple Access (TDMA) cellular system.

11. A portable communication apparatus for transmitting a transmission signal to a base station and for receiving another transmission signal from said base station in a predetermined communication system, comprising:

transmission timing means for providing transmission timing of the transmission signal transmitted to the base station in said predetermined communication system;

demodulating means for receiving a satellite signal from a GPS satellite and for demodulating said satellite signal received; and

demodulation control means for controlling demodulation timing of said demodulating of said satellite signal in accordance with said transmission timing from said transmission timing means.

12. The portable communication apparatus according to claim 11, wherein said demodulation control means controls said demodulating of said satellite signal such that demodulation occurs when said transmission signal is not transmitted based on said transmission timing.

13. The portable communication apparatus according to claim 11, wherein said demodulation control means controls said demodulating of said satellite signal such that demodulation occurs before continuously transmitting said transmission signal based on said transmission timing.

14. The portable communication apparatus according to claim 11, wherein said demodulation control means controls said demodulating of said satellite signal such that demodulation occurs before continuously transmitting said transmission signal and before said transmission signal is intermittently transmitted based on said transmission timing.

15. The portable communication apparatus according to claim 11, further comprising:

demodulation timing informing means for informing said demodulating means of said demodulation timing to be used by said demodulating means; and

transmission control means for controlling said transmission timing to transmit said transmission signal to said base station in said communication system in accordance with said demodulation timing from said demodulation timing informing means.

16. The portable communication apparatus according to claim 15, wherein said transmission control means delays said transmission timing of said transmission signal to be transmitted to said base station in said predetermined communication system until a result of said demodulation is obtained by said demodulating means in accordance with said demodulation timing.

17. The portable communication apparatus according to claim 11, wherein said transmission signal is a line connection request signal to said base station in said predetermined communication system.

18. The portable communication apparatus according to claim 11, wherein said transmission signal is transmitted in a form of transmission packets containing a predetermined amount of data and said demodulation control means demodulates said satellite signal when said transmission packets are not transmitted.

19. The portable communication apparatus according to claim 11, wherein said communication system is a Code Division Multiple Access (CDMA) cellular system.

20. The portable communication apparatus according to claim 11, wherein said communication system is a Time Division Multiple Access (TDMA) cellular system.