PULSE RADAR DEVICE
First Claim
1. A pulse radar device, comprising:
- a continuous wave generation circuit generating a continuous wave of a prescribed high frequency;
a transmission circuit receiving the continuous wave generated by the continuous wave generation circuit and modulating the continuous wave into a pulse signal;
a transmitting antenna repeatedly emitting the pulse signal from the transmission circuit into space at a prescribed emission period;
two or more receiving antennas receiving reflected signals from the pulse signal emitted from the transmitting antenna reflecting off of an object to be measured;
two or more amplifiers respectively amplifying the received reflected signals that have been received by the two or more receiving antennas so as to output respective amplified signals;
a signal selection switch receiving the respective amplified signals and switching between said respective amplified signals at a prescribed switching period so as to sequentially select and output the amplified signals originating from one of the receiving antennas at the prescribed switching period;
a mixer receiving said selected amplified signals sequentially outputted from the signal selection switch, the mixer down-converting said selected amplified signals by using the continuous wave input from the continuous wave generation circuit so as to output a baseband signal;
a frequency analyzer analyzing the baseband signal from the mixer and outputting information about the object detected from the baseband signal; and
a high pass filter provided after the signal selection switch and before the frequency analyzer, the high pass filter causing DC and other low frequency components that are lower than a prescribed frequency in the baseband signal to be removed before reaching the frequency analyzer.
1 Assignment
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Accused Products
Abstract
The objective of the present invention is to use a simple circuit configuration and simple signal processing to provide a pulse radar device with which it is possible to reduce the impact of local signal carrier leakage on a received signal, and which makes it possible to perform high precision angle measurement using a multi-beam system. In order to measure the angle of an object, a pulse radar device is provided with at least two receiving antennas, and a reception circuit is provided with a signal selection switch for selectively switching between received signals received by the receiving antennas. The received signal contains a local signal leakage component, and a DC level of the received signal varies with the switching of the signal selection switch. In order to eliminate the impact of such DC level variations, a high-pass filter is disposed between a mixer and a frequency analyzer.
9 Citations
17 Claims
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1. A pulse radar device, comprising:
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a continuous wave generation circuit generating a continuous wave of a prescribed high frequency; a transmission circuit receiving the continuous wave generated by the continuous wave generation circuit and modulating the continuous wave into a pulse signal; a transmitting antenna repeatedly emitting the pulse signal from the transmission circuit into space at a prescribed emission period; two or more receiving antennas receiving reflected signals from the pulse signal emitted from the transmitting antenna reflecting off of an object to be measured; two or more amplifiers respectively amplifying the received reflected signals that have been received by the two or more receiving antennas so as to output respective amplified signals; a signal selection switch receiving the respective amplified signals and switching between said respective amplified signals at a prescribed switching period so as to sequentially select and output the amplified signals originating from one of the receiving antennas at the prescribed switching period; a mixer receiving said selected amplified signals sequentially outputted from the signal selection switch, the mixer down-converting said selected amplified signals by using the continuous wave input from the continuous wave generation circuit so as to output a baseband signal; a frequency analyzer analyzing the baseband signal from the mixer and outputting information about the object detected from the baseband signal; and a high pass filter provided after the signal selection switch and before the frequency analyzer, the high pass filter causing DC and other low frequency components that are lower than a prescribed frequency in the baseband signal to be removed before reaching the frequency analyzer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification