RADAR DEVICE
First Claim
1. A radar device for transmitting a high-frequency transmission signal intermittently in a transmission cycle having a predetermined transmission period and a non-transmission period, receiving a signal reflected by a target by using a plurality of reception antennas, and detecting the target based on the reflected signal, the radar device comprising:
- a transmission signal generator which generates a transmission signal in baseband;
a RF transmitter which converts the transmission signal generated by the transmission signal generator into a high-frequency transmission signal;
a directional coupler which distributes the high-frequency transmission signal converted by the RF transmitter in accordance with a predetermined signal power ratio;
a level adjuster which adjusts the high-frequency transmission signal distributed by the directional coupler to a predetermined level;
a signal combiner which combines a signal output from the level adjuster and a reception signal received by the reception antennas;
a RF receiver which converts the signal combined by the signal combiner into a reception signal in the baseband;
a reference transmission signal generator which generates a reference transmission signal the same as the transmission signal generated by the transmission signal generator;
a correlation value calculator which calculates a correlation value between the reference transmission signal generated by the reference transmission signal generator and the reception signal converted by the RF receiver;
a phase shift quantity calculator which calculates a phase shift quantity in arbitrary one of the reception antennas based on the correlation value in a reference reception antenna which is specific one of the reception antennas and the correlation value in any one of the other reception antennas; and
a phase corrector which corrects a phase component of the correlation value in the arbitrary reception antenna based on the phase shift quantity calculated by the phase shift quantity calculator.
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Accused Products
Abstract
The disclosed technique includes transmitting a signal intermittently according to a transmission cycle having a predetermined transmission period and a non-transmission period; receiving the signal reflected from a target with reception antennas; and detecting the target from the reflected signal. A high-frequency transmission signal attenuated during the transmission period and a receipt signal received during the non-transmission period are combined together. A correlation value between a reference transmission signal and the receipt signal in the combined signal is calculated, and the amount of phase shift in an arbitrarily selected reception antenna is calculated from the correlation value of a reference reception antenna, and the correlation values of the other reception antennas. The phase component of the correlation value of the arbitrarily selected reception antenna is corrected on the basis of the amount of phase shift.
67 Citations
13 Claims
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1. A radar device for transmitting a high-frequency transmission signal intermittently in a transmission cycle having a predetermined transmission period and a non-transmission period, receiving a signal reflected by a target by using a plurality of reception antennas, and detecting the target based on the reflected signal, the radar device comprising:
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a transmission signal generator which generates a transmission signal in baseband; a RF transmitter which converts the transmission signal generated by the transmission signal generator into a high-frequency transmission signal; a directional coupler which distributes the high-frequency transmission signal converted by the RF transmitter in accordance with a predetermined signal power ratio; a level adjuster which adjusts the high-frequency transmission signal distributed by the directional coupler to a predetermined level; a signal combiner which combines a signal output from the level adjuster and a reception signal received by the reception antennas; a RF receiver which converts the signal combined by the signal combiner into a reception signal in the baseband; a reference transmission signal generator which generates a reference transmission signal the same as the transmission signal generated by the transmission signal generator; a correlation value calculator which calculates a correlation value between the reference transmission signal generated by the reference transmission signal generator and the reception signal converted by the RF receiver; a phase shift quantity calculator which calculates a phase shift quantity in arbitrary one of the reception antennas based on the correlation value in a reference reception antenna which is specific one of the reception antennas and the correlation value in any one of the other reception antennas; and a phase corrector which corrects a phase component of the correlation value in the arbitrary reception antenna based on the phase shift quantity calculated by the phase shift quantity calculator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 12, 13)
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10. The radar device according to claim further comprising:
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a second switch which switches whether inputting of the high-frequency transmission signal attenuated by the level adjuster to the signal combiner is blocked or not, wherein the switch controller controls the second switch so that whether inputting of the high-frequency transmission signal to the signal combiner is blocked or not, is switched in accordance with a cycle of sequentially changing the reception antennas.
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11. The radar device according to claim further comprising:
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an intersystem fixed phase error storage which stores intersystem fixed phase error from each of the reception antennas to the switch, wherein the phase shift quantity calculator corrects the phase shift quantity in any one of the other reception antennas inclusive of the intersystem fixed phase error stored in the intersystem fixed phase error storage.
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Specification