POSITIONING DEVICE, ELECTRONIC INSTRUMENT, AND STORAGE MEDIUM STORING PROGRAM
First Claim
Patent Images
1. A positioning device comprising:
- a plurality of filters which differ in passband, each of the filters extracting a signal in a specific frequency band from a signal received by an RF reception circuit section which receives a GPS satellite signal;
storage sections which correspond to the respective filters, each of the storage sections storing a signal output from the corresponding filter; and
a positioning section which alternatively selects one of the storage sections and performs a specific positioning process based on the signal stored in the selected storage section.
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Abstract
Signals output from two filters included in a filter section 70 and differing in passband are respectively stored in different memories included in a memory section 80, and a positioning process is performed based on the signal stored in the memory. Specifically, the signal strength of a received signal is calculated by a coherent accumulation process and an incoherent accumulation process, and a signal system used for positioning is alternatively switched to a high-sensitivity system S1 or a high-accuracy system S2 as a result of determining whether or not the signal strength is equal to or greater than a threshold value.
19 Citations
15 Claims
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1. A positioning device comprising:
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a plurality of filters which differ in passband, each of the filters extracting a signal in a specific frequency band from a signal received by an RF reception circuit section which receives a GPS satellite signal; storage sections which correspond to the respective filters, each of the storage sections storing a signal output from the corresponding filter; and a positioning section which alternatively selects one of the storage sections and performs a specific positioning process based on the signal stored in the selected storage section. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A computer-readable storage medium storing a program for a device which includes a plurality of filters which differ in passband, each of the filters extracting a signal in a specific frequency band from a signal received by an RF reception circuit section which receives a GPS satellite signal, storage sections which correspond to the respective filters, each of the storage sections storing a signal output from the corresponding filter, and a processor which can execute a program,
the program causing the processor to function as: a positioning section which alternatively selects one of the storage sections and performs a specific positioning process based on the signal stored in the selected storage section. - View Dependent Claims (10, 11, 12, 13, 14, 15)
Specification