| CPC G01S 13/58 (2013.01) | 14 Claims |
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1. A radar apparatus, comprising:
signal generation circuitry, which, in operation, generates a baseband signal;
code generation circuitry, which, in operation, generates a plurality of code sequences;
phase rotation circuitry, which, in operation, adds phase rotation based on used code sequences among the plurality of code sequences to the baseband signal and generates a plurality of transmission signals that has been code-multiplexed; and
a plurality of transmission antennas, which, in operation, transmits the plurality of transmission signals, respectively, wherein
a code length of each of the plurality of code sequences is larger than a code multiplexing number with respect to the plurality of transmission signals,
the plurality of code sequences includes the used code sequences and unused code sequences, the used code sequences are one or more pairs and the unused code sequences are two or more code sequences,
each pair of the used code sequences are a set of codes in which odd-numbered code elements are identical between the used code sequences in each pair and even-numbered code elements are code-inverted between the used code sequences in each pair, or a set of codes in which the even-numbered code elements are identical between the used code sequences in each pair and the odd-numbered code elements are code-inverted between used code sequences in each pair, and
the unused code sequences differ from the used code sequences.
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