Abstract A method and apparatus for measuring the distance traveled by and the speed of a moving object incorporating a frequency mixing system, in which both a transmitter and a receiver are mounted on a moving object to be measured and also at a fixed point so that, when one of the moving objects and the fixed point is assumed as a first point and the other as a second point, a radio wave having a first reference frequency fA and transmitted from the transmitter at the first point is received at the second point where a secondary frequency fC is generated with the sum of the first reference frequency fA received and an internally-generated second reference frequency fB, and this secondary frequency fC is then transmitted from the second point and is received at the first point where this received wave of the frequency fC is mixed with another secondary frequency having the same frequency as that of the secondary frequency fC, which is generated with the sum of the first reference frequency fA and another second reference frequency of the same frequency as that of the second reference frequency fB which is generated at the first point, so as to produce crests or valleys in the resultant waves, whereby in accordance with variations of the distance traveled between the first and second points, and information related to the wavelength of the secondary frequency fC is obtained which is then quantized to measure the distance traveled by and the travelling speed of the moving object.
A travel distance measuring method incorporating a frequency mixing system wherein a radio wave having a first reference frequency fA radiated from a transmitting source provided at a first point is received at a second point where a secondary frequency fC is produced with the sum of said first reference frequency fA and a second reference frequency fB internally produced at said second point to transmit said secondary frequency fC therefrom, and said secondary frequency fC is then received at said first point where said secondary frequency fC is mixed with another secondary frequency having the same frequency as that of said secondary frequency fC and produced with the sum of said first reference frequency fA and another second reference frequency having the same frequency as that of said second reference frequency fB and produced at said first point so as to produce crests or valleys in the resulting waves, whereby in accordance with variations of the distance between said first and second points, travel distance information related to the wavelength of said secondary frequency fC is obtained and quantized to thereby measure the distance traveled by the moving object.
Claim 2
Dependent Claim
190 words
A travel distance measuring method incorporating a frequency mixing system wherein a radio wave having a first reference frequency fA radiated from a transmitting source provided at a first point is received at a second point where a secondary frequency fC is produced with the sum of said first reference frequency fA and a second reference frequency fB internally produced at said second point to transmit said secondary frequency fC therefrom, and said secondary frequency fC is then received at said first point where said secondary frequency fC is mixed with another secondary frequency having the same frequency as that of said secondary frequency fC and produced with the sum of said first reference frequency fA and another second reference frequency having the same frequency as that of said second reference frequency fB and produced at said first point so as to produce crests or valleys in the resulting waves, whereby in accordance with variations of the distance between said first and second points, travel distance information related to the wavelength of said secondary frequency fC is obtained and quantized to thereby measure the distance traveled by the moving object.
Claim 3
Dependent Claim
68 words
A travel distance measuring apparatus comprising: a circuit for quantizing the distance information related to the wavelength of the secondary frequency fC obtained according to the travel distance measuring method as set forth in claim 1, and a counter for counting the number of the output quantization pulses from said circuit, whereby the distance traveled by a moving object in the direction connecting the two points is measured.
Claim 4
Dependent Claim
52 words
A travel speed measuring apparatus comprising: a circuit for producing an electrical output proportional to the number of the output quantization pulses produced per unit time by the quantization circuit as set forth in Claim 2, whereby the speed of a moving object in the direction connecting the two points is measured.