GPS receiver and portable communication apparatus

• US 20010020912A1
• Filed: 01/29/2001
• Published: 09/13/2001
• Est. Priority Date: 01/31/2000
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Hasegawa, Koji, Naruse, Tetsuya, Teranishi, Koichiro, Hori, Katsuya
• Granted Patent: US 6,466,163 B2
• Time in Patent Office: Days
• US Class Current: 342/357.06
• 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

In a GPS receiver and a portable communication apparatus according to this invention, demodulation timing of the GPS received signal received from a satellite in the global positioning system is controlled in accordance with transmission timing of transmitting the CDMA transmission signal to a base station in a predetermined communication system, so that the GPS received signal can be accurately demodulated, preventing radio waves which 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 informing means for giving notice of transmission timing to transmit 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 to demodulate said satellite signal in accordance with said transmission timing given from said transmission timing informing means.

2. The GPS receiver according to

claim 1

wherein said demodulation control means demodulates said satellite signal when said transmission signal is not transmitted, in accordance with said transmission timing.

3. The GPS receiver according to

claim 1

wherein said demodulation control means demodulates said satellite signal before continuously transmitting said transmission signal, in accordance with said transmission timing.

4. The GPS receiver according to

claim 3

wherein said demodulation control means demodulates said satellite signal both before continuously transmitting said transmission signal and when said transmission signal is not intermittently transmitted, in accordance with said transmission timing.

5. The GPS receiver according to

claim 1

, comprising:

demodulation timing informing means for giving notice 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 given from said demodulation timing informing means.

6. The GPS receiver according to

claim 5

wherein said transmission control means delays the transmission timing of said transmission signal to be transmitted to said base station in said communication system until the result of 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, which is a unit of 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 to transmit/receive a transmission signal to/from a base station in a predetermined communication system, comprising:

transmission timing informing means for giving notice of transmission timing to transmit a transmission signal to said 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 to demodulate said satellite signal in accordance with said transmission timing given from said transmission timing informing means.

12. The portable communication apparatus according to

claim 11

wherein said demodulation control means demodulates said satellite signal when said transmission signal is not transmitted, in accordance with said transmission timing.

13. The portable communication apparatus according to

claim 11

wherein said demodulation control means demodulates said satellite signal before continuously transmitting said transmission signal, in accordance with said transmission timing.

14. The portable communication apparatus according to

claim 13

wherein said demodulation control means demodulates said satellite signal both before continuously transmitting said transmission signal and when said transmission signal is intermittently transmitted, in accordance with said transmission timing.

15. The portable communication apparatus according to

claim 11

, comprising:

demodulation timing informing means for giving notice 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 given from said demodulation timing informing means.

16. The portable communication apparatus according to

claim 15

wherein said transmission control means delays the transmission timing of said transmission signal to be transmitted to said base station in said communication system until the result of 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 communication system.

18. The portable communication apparatus according to

claim 11

wherein said transmission signal is transmitted in a form of transmission packets, which is a unit of 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.