Measuring apparatus and measuring method
First Claim
1. A measuring apparatus for measuring at least a distance from an object, comprising:
- a transmitting means for alternately modulating amplitudes of a first continuous wave having a first frequency and a second continuous wave having a second frequency,wherein the transmitting means modulates amplitudes for transmitting a transmission signal as a carrier wave using an AM signal;
an AM producing means for producing the AM signal used for the amplitude modulation;
a receiving means for receiving a reflection signal of the transmission signal transmitted from the transmitting means and reflected by the object to be measured as a receipt signal;
a first distance calculating means for;
detecting a phase difference between a first Doppler signal for the first continuous wave and a second Doppler signal for the second continuous wave from the receipt signal received by the receiving means, andcalculating a distance from the object to be measured according to a first method using the detected phase difference;
a second distance calculating means for;
demodulating the receipt signal received by the receiving means into the AM signal,detecting a phase difference between the AM signal after demodulation and the AM signal produced from the AM producing means, andcalculating a distance from the object to be measured according to a second method using the detected phase difference; and
a determining means for determining a final distance measurement result based on the distance calculated by the first distance calculating means and the distance calculated by the second distance calculating means.
1 Assignment
0 Petitions
Accused Products
Abstract
A measuring apparatus for measuring a distance from an object to be measured has, a transmitting means for alternately modulating amplitudes of a first continuous wave having a first frequency and a second continuous wave having a second frequency for transmitting a transmission signal as a carrier wave using an AM signal. The AM signal is produced by an AM producing circuit for modulating the amplitudes. The transmission signal is reflected as a reflection signal by the object to be measured and received by a receiving circuit. A first distance calculating circuit calculates the distance using a phase difference between the first and second continuous waves. A second distance calculating circuit is used for demodulating the receipt signal, detecting a phase difference, and calculating a distance from the object to be measured using the detected phase difference. A determining circuit determines a final distance measurement based on the above calculations.
-
Citations
4 Claims
-
1. A measuring apparatus for measuring at least a distance from an object, comprising:
-
a transmitting means for alternately modulating amplitudes of a first continuous wave having a first frequency and a second continuous wave having a second frequency, wherein the transmitting means modulates amplitudes for transmitting a transmission signal as a carrier wave using an AM signal; an AM producing means for producing the AM signal used for the amplitude modulation; a receiving means for receiving a reflection signal of the transmission signal transmitted from the transmitting means and reflected by the object to be measured as a receipt signal; a first distance calculating means for; detecting a phase difference between a first Doppler signal for the first continuous wave and a second Doppler signal for the second continuous wave from the receipt signal received by the receiving means, and calculating a distance from the object to be measured according to a first method using the detected phase difference; a second distance calculating means for; demodulating the receipt signal received by the receiving means into the AM signal, detecting a phase difference between the AM signal after demodulation and the AM signal produced from the AM producing means, and calculating a distance from the object to be measured according to a second method using the detected phase difference; and a determining means for determining a final distance measurement result based on the distance calculated by the first distance calculating means and the distance calculated by the second distance calculating means. - View Dependent Claims (2, 3)
-
-
4. A method of for measuring at least a distance from an object, comprising the steps of:
-
alternately modulating amplitudes of a first continuous wave having a first frequency and a second continuous wave having a second frequency for transmitting a transmission signal as a carrier wave using an AM signal; receiving a reflection signal of the transmission signal reflected by the object to be measured as a receipt signal; detecting a phase difference between a first Doppler signal for the first continuous wave and a second Doppler signal for the second continuous wave from the receipt signal, calculating a distance from the object to be measured according to a first method using the detected phase difference; demodulating the receipt signal into the AM signal, detecting a phase difference between the AM signal after demodulation and the AM signal used for the amplitude modulation, calculating a distance from the object to be measured according to a second method using the detected phase difference; and determining a final distance measurement result based on the distance calculated by the first method and the distance calculated by the second method.
-
Specification