| 摘要 |
PROBLEM TO BE SOLVED: To achieve a Doppler frequency estimation device capable of relatively precisely setting a Doppler frequency at an initial point of time of tracking with a simple configuration and low-load processing. SOLUTION: A control unit 35 acquires code correlation data for every prescribed code phase difference over the entire code as primary search processing, and detects a code phase that becomes the maximum code correlation data. Then, the control unit 35 acquires code correlation data for each prescribed code phase difference within a search range set from results of the primary search processing, and detects a code phase that becomes the maximum code correlation data. The control unit 35 calculates a Doppler frequency, namely a frequency error between a carrier frequency for search and an actual carrier frequency from a time interval and the amount of code shift from a code phase that becomes the maximum code correlation data in primary search processing to a code phase that becomes the maximum code correlation data in first secondary search processing. COPYRIGHT: (C)2011,JPO&INPIT
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