US 8,619,929 B2 · Positioning signal reception device and control method of positioning signal reception device

Abstract

A positioning signal reception device receives a positioning signal transmitted from a position information satellite, and includes: a signal reception portion that obtains a reception signal by receiving the positioning signal; an A/D conversion portion that generates a digital signal by converting the reception signal into a digital form; a filter portion that subjects the digital signal to frequency separation, a characteristic of the filter portion being changeable; a filter characteristic change portion that changes the characteristic of the filter portion according to an operating state of the positioning signal reception device and an external environmental condition of the positioning signal reception device; and a code synchronization establishment portion that establishes synchronization of spreading codes contained in the reception signal.

Claims11

Dependent claims

A receiver that receives a positional signal from a positioning satellite to execute a positioning calculation, the receiver comprising:

a filter that filters the positional signal, the filter having a filter bandwidth within a certain bandwidth, wherein a phase characteristic and a frequency characteristic of the filter is changeable;
and
a filter configurer that configures the filter to make the filter bandwidth broader by flattening the phase characteristic over wide frequencies of the positional signal when the positioning satellite is synchronized beyond a predetermined period of time than when the positioning signal is not readily received by the receiver.

Dependencies are inferred from the claim text.

Positioning signal reception device and control method of positioning signal reception device

Life of this patent

Positioning signal reception device and control method of positioning signal reception device

Life of this patent

Abstract

Claims11