GPS receiver and mobile unit incorporating the same
First Claim
1. A GPS receiver comprising:
- a GPS signal antenna for receiving externally transmitted GPS signals;
an analogue-to-digital converter coupled to the antenna for sampling the received GPS signal;
a memory for storing the GPS signal samples;
a digital GPS signal processor for processing the GPS signal samples stored in the memory to recover pseudorange information; and
a controller for controlling the operation of the receiver;
wherein the receiver has a dormant mode of operation in which received GPS signals are sampled and stored in the memory but the signal processor is not operative for recovering pseudorange information from the GPS signal samples, and an active mode of operation in which the signal processor is operative for recovering pseudorange information from the GPS signal samples, characterized in that the controller is arranged to cause a change from the dormant mode to the active mode in response to an instruction for a GPS position fix received by the receiver whilst the receiver is operating in the dormant mode.
8 Assignments
0 Petitions
Accused Products
Abstract
GPS receiver (1) is disclosed together a mobile unit especially in the form of a mobile cellular telephone (30) incorporating the same. The GPS receiver (1) comprises a GPS signal antenna (10) for receiving externally transmitted GPS signals; an analogue-to-digital converter (11) coupled to the antenna for sampling the received GPS signals; a memory (12) for storing the GPS signal samples; and a digital GPS signal processor (13, 14) for retrieving pseudorange information from the GPS signal samples stored in the memory (12). The receiver (1) has a dormant mode of operation in which received GPS signals are sampled and stored in the memory (12) but the signal processor (13, 14) is not operative for retrieving pseudorange information, and an active mode of operation in which the signal processor (13, 14) is operative for retrieving pseudorange information. Also, the receiver (1) is arranged to change from the dormant mode to the active mode in response to a instruction received from external to the receiver (1) and made whilst the receiver (1) is operating in the dormant mode.
-
Citations
22 Claims
-
1. A GPS receiver comprising:
-
a GPS signal antenna for receiving externally transmitted GPS signals;
an analogue-to-digital converter coupled to the antenna for sampling the received GPS signal;
a memory for storing the GPS signal samples;
a digital GPS signal processor for processing the GPS signal samples stored in the memory to recover pseudorange information; and
a controller for controlling the operation of the receiver;
wherein the receiver has a dormant mode of operation in which received GPS signals are sampled and stored in the memory but the signal processor is not operative for recovering pseudorange information from the GPS signal samples, and an active mode of operation in which the signal processor is operative for recovering pseudorange information from the GPS signal samples, characterized in that the controller is arranged to cause a change from the dormant mode to the active mode in response to an instruction for a GPS position fix received by the receiver whilst the receiver is operating in the dormant mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
-
18. A method of operating a GPS receiver comprising a GPS signal antenna for receiving externally transmitted GPS signals;
- an analogue-to-digital converter coupled to the antenna for sampling the received GPS signals;
a memory for storing the GPS signal samples;
a digital GPS signal processor for processing the GPS signal samples stored in the memory to recover pseudorange information; and
a controller for controlling the operation of the receiver, the method comprising the steps of;(i) in a dormant mode of operation, sampling and storing received GPS signals in the memory whilst the signal processor for recovering pseudorange information from the GPS signal samples is not operative; and
(ii) in response to an instruction for a GPS position fix received by the controller whilst the receiver is operating in the dormant mode, the controller causing a change from the dormant mode to an active mode of operation in which the signal processor for retrieving pseudorange information from the GPS signal samples becomes operative. - View Dependent Claims (19, 20, 21, 22)
- an analogue-to-digital converter coupled to the antenna for sampling the received GPS signals;
Specification