Object sensing apparatus
First Claim
1. An object sensing apparatus comprising:
- transmission/reception section for transmitting an electromagnetic wave to a predetermined region and for receiving a reflection wave of the transmitted electromagnetic wave reflected from an object;
object sensing section for sensing the object based upon a reception signal received by the transmission/reception section; and
abnormal condition judging section for judging an abnormal condition based upon a signal level of the reception signal received by the transmission/reception section, wherein the transmission/reception section is capable of switching an FM-CW mode in which a frequency of an electromagnetic wave to be transmitted can be continuously modulated, and a CW mode in which the frequency of the electromagnetic wave to be transmitted is not modulated; and
the abnormal condition judging section judges an abnormal condition based upon a signal level of a reception signal in the FM-CW mode and a signal level of a reception signal in the CW mode.
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Accused Products
Abstract
While an FM-CW mode for sensing an object, in which a frequency of an electromagnetic wave transmitted from a transmission/reception antenna 6 is continuously modulated, and also, a CW mode for judging an abnormal condition, in which the frequency of the electromagnetic wave to be transmitted from the transmission/reception antenna 6 is not modulated are switched, an abnormal condition judging section judges an abnormal condition when a signal level of a reception signal of the FM-CW mode is smaller than, or equal to a first judging threshold value, and also, a signal level of a reception signal in the CW mode is smaller than, or equal to a second judging threshold value which is higher than the first judging threshold value.
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Citations
6 Claims
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1. An object sensing apparatus comprising:
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transmission/reception section for transmitting an electromagnetic wave to a predetermined region and for receiving a reflection wave of the transmitted electromagnetic wave reflected from an object;
object sensing section for sensing the object based upon a reception signal received by the transmission/reception section; and
abnormal condition judging section for judging an abnormal condition based upon a signal level of the reception signal received by the transmission/reception section, wherein the transmission/reception section is capable of switching an FM-CW mode in which a frequency of an electromagnetic wave to be transmitted can be continuously modulated, and a CW mode in which the frequency of the electromagnetic wave to be transmitted is not modulated; and
the abnormal condition judging section judges an abnormal condition based upon a signal level of a reception signal in the FM-CW mode and a signal level of a reception signal in the CW mode. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification