Patent ID: 7620132

Claim:
A positioning signal reception device that receives a positioning signal transmitted from a position information satellite, comprising: 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 code synchronization establishment portion that establishes synchronization of spreading codes contained in the reception signal; and a filter characteristic change portion that changes the characteristic of the filter portion to a narrower band until the code synchronization has been stabilized due to an operating state of the positioning signal reception device or an external environmental condition of the positioning signal reception device, the narrower band being narrower compared to a bandwidth of the filter portion while the code synchronization is in a stable manner, the filter characteristic change portion changing the characteristic of the filter portion so that a bandwidth of a signal outputted from the filter portion becomes narrower during the time period from when the signal reception portion obtains the reception signal until the synchronization of the spreading codes is established and the synchronization comes to be maintained in a stable manner, the filter characteristic change portion changing the characteristic of the filter portion so that the bandwidth of the signal outputted from the filter portion becomes broader after the synchronization of the spreading codes is established and the synchronization is maintained in a stable manner.