Satellite radiowave receiving device

摘要

A satellite radiowave receiving device includes: a receiving unit which receives a radiowave signal; a conversion unit which converts the radiowave signal into digital data; a detection/arithmetic operation unit which detects the satellite signal; a capturing unit which searches a reception frequency; a setting unit which sets a second bit number, and the number of parallel processing in which the predetermined arithmetic operation can be executed in parallel; and a specifying unit which specifies the reception frequency of the satellite signal, and the detection/arithmetic operation unit executes the predetermined arithmetic operation in parallel for the input signal data related to reception frequencies of which number is equal to or less than a predetermined number of maximum parallel processing, and the number of parallel processing is determined so that a total bit number is equal to or less than the maximum bit number/the number of maximum processing.

主权项

1. A satellite radiowave receiving device comprising:
a receiving unit which receives a radiowave signal of a frequency band including a transmission frequency of a satellite signal transmitted on a radiowave from a positioning satellite; a conversion unit which converts the radiowave signal received by the receiving unit into digital data; a detection/arithmetic operation unit which performs a predetermined arithmetic operation to detect the satellite signal in a predetermined reception frequency from the digital data; a capturing unit which:
(i) is configured for the detection/arithmetic operation unit to sequentially obtain input signal data related to reception frequencies, the reception frequencies being set at a first frequency interval across a first frequency range, by every 1 reception frequency at a first bit number equal to or less than a maximum bit number preset per data sample from the digital data, and to perform the predetermined arithmetic operation; and(ii) searches a reception frequency at which the satellite signal is detected based on a result of the predetermined arithmetic operation; a setting unit which sets:
(i) a second bit number equal to or less than the first bit number, the second bit number being determined in response to reception intensity in an event where the satellite signal is detected by the capturing unit; and(ii) the number of parallel processing in which the detection/arithmetic operation unit is configured to execute the predetermined arithmetic operation in parallel from the input signal data of the second bit number per data sample; and a specifying unit which:
(i) is configured for the detection/arithmetic operation unit to obtain input signal data, the input signal data being related to reception frequencies set at a second frequency interval narrower than the first frequency interval across a second frequency range including the reception frequency at which the satellite signal is detected by the capturing unit, by every reception frequency of the number of parallel processing at the second bit number per data sample from the digital data, and to perform the predetermined arithmetic operation in parallel; and(ii) specifies the reception frequency of the satellite signal based on a result of the predetermined arithmetic operation, wherein the detection/arithmetic operation unit is configured to execute the predetermined arithmetic operation in parallel for the input signal data related to reception frequencies of which number is equal to or less than a predetermined number of maximum parallel processing, and the number of parallel processing is determined so that a total bit number of the data samples of which number is the number of parallel processing is equal to or less than the maximum bit number and equal to or less than the number of maximum processing.