| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a Dappler positioning apparatus by which an irregularity in a Doppler amount is suppressed even when the C/N ratio of a signal in an intermediate-frequency band is degraded and by which a receiving position can be computed with good accuracy. SOLUTION: Reception frequencies which are output from a carrier reproducer 4 and a carrier measuring device 5 are stored in a reception-frequency storage part 9, and a fixed-pattern detector 12 detects that a fixed pattern is contained in demodulation data by a data demodulator 3. Then, data on the reception frequencies stored in the reception-frequency storage part 9 before and after its detection in terms of time are averaged and processed by an averaging device 10 so as to be output to a Doppler-amount computing part 6. The Doppler-amount computing part 6 finds a Doppler amount on the basis of the averaged and processed reception frequencies and on the basis of a transmission frequency contained in the demodulation data, and a positioning computing and processing part 7 computes a reception position on the basis of the Doppler amount.</p> |
