Multipath signal determination method, signal suitability determination method, positioning operation method, program, and multipath signal determination circuit
AssigneeSeiko Epson Corporation
InventorMakoto Murakami
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Abstract
A multipath signal determination method includes carrying out correlation operation between a received signal of a positioning signal spread-modulated with a spread code and a replica signal of the spread code with respect to each of IQ components at a predetermined sampling phase interval, and determining whether the received signal is a multipath signal or not, in accordance with a plot position in the case where each correlation value in each of the sampling phases is sequentially plotted on an IQ coordinate.
Claims6
A multipath signal determination method comprising:
- carrying out a correlation operation between a received signal of a positioning signal spread-modulated with a spread code and a replica signal of the spread code with respect to each of IQ components at a predetermined sampling phase interval;
- determining whether the received signal is a multipath signal or not, in accordance with a plot position when each correlation value in each of the sampling phases is sequentially plotted on an IQ coordinate, wherein the determining whether the received signal is the multipath signal or not includes determining that the received signal is the multipath signal when the plot position sequentially plotted on the IQ coordinate has a shape of a closed curve;
- and
- determining suitability of the received signal for use in positioning operation in accordance with an extent of the closed curve.
A multipath signal determination method comprising:
- carrying out a correlation operation processing plural times with the lapse of time, in which the correlation operation is carried out between a received signal of a positioning signal spread-modulated with a spread code and a replica signal of the spread code with respect to each of IQ components at a predetermined sampling phase interval;
- carrying out selection of a peak correlation value from correlation values in each of the sampling phases for each of the plural times of the correlation operation processing;
- and
- determining whether the received signal is a multipath signal or not, in accordance with a positional change in the peak correlation value on an IQ coordinate with the lapse of time, wherein the determining of whether the received signal is the multipath signal or not includes determining that the received signal is the multipath signal when the change in position of the peak correlation value on the IQ coordinate with the lapse of time is an arcuate change in position.
A multipath signal determination circuit having a processor that executes:
- correlation operation between a received signal of a positioning signal spread-modulated with a spread code and a replica signal of the spread code with respect to each of IQ components at a predetermined sampling phase interval;
- and
- determination of whether the received signal is a multipath signal or not, in accordance with a plot position when each correlation value in each of the sampling phases is sequentially plotted on an IQ coordinate, wherein the determination whether the received signal is the multipath signal or not includes determination of a fact that the received signal is the multipath signal when the plot position sequentially plotted on the IQ coordinate has a shape of a closed curve;
- and
- determination of suitability of the received signal for use in positioning operation in accordance with an extent of the closed curve.
Dependencies are inferred from the claim text.