Title: Perspective navigation system employing the inner comparisons of signal phases received on an aircraft by a plurality of sensors

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Claims: What is claimed is:

1. A system for displaying a perspective scene having a plurality of markers as viewed from a moving remote reference frame comprising:

a. means for transmitting signals having a reference frequency from the plurality of markers in a sequence;

b. a reference frequency source at the remote reference frame;

c. first, second, and third means for sensing in sequence the transmitted signals with the first, second, and third sensing means having a predetermined spacing at the remote reference frame;

d. a first measuring means, measuring the phase difference between the signals from the first and second sensing means;

e. a second measuring means, measuring the phase difference between the signals from the first and third sensing means;

f. a third measuring means, measuring the phase difference between the signals from the first sensing means and the reference frequency source;

g. means for computing the radial and angular positions of each marker with respect to the reference frame, the computing means being fed by the first, second, and third measuring means; and

h. means for displaying the positions fed by the computing means.

2. A system for displaying a perspective view according to claim 1 which further comprises time interval means for controlling the sequence for transmitting the signals.

3. A system for displaying a perspective view according to claim 2 wherein the means for displaying the positions comprise an oscilloscope having vertical and horizontal inputs fed by the computing means and an activating signal from the time interval means.

4. A method of displaying a perspective representation of an object from a remote and linearly moving reference frame comprising:

a. transmitting reference signals from beacons positioned about the object;

b. sensing the transmitted signals from first, second, and third sensors positioned on the moving reference frame;

c. phase comparing the signal from the first sensor with a signal from a reference frequency source;

d. phase comparing the signal from the first sensor with the signal from the second sensor;

e. phase comparing the signal from the first sensor with the signal from the third sensor;

f. computing perspective position coordinates based on the phase comparing; and

g. displaying the perspective position coordinates.

5. A method of viewing a perspective representation of an object according to claim 4 wherein the transmitting of the beacon signals is performed sequentially.

Other info:

Inventors: Lammers, Uve H. W. (Chelmsford, MA, US)

Application Number: 471934
Filing Date: 1974-05-21
Publication_date: 1976-04-20
Assignee:
Primary Class(es): 342/410 345/427, 701/17
Other Classes:
US Patent Ref:

2226860	Dec, 1940	Greig	343/118.
2463095	Mar, 1949	Wight et al.	343/108.
3237195	Feb, 1966	Schiffman	343/112.
3503071	Mar, 1970	Earp	343/112.

Other Refs:
Primary Examiner: Wilbur, Maynard R.
Assistant Examiner: Buczinski, S. C.
Attorney: Rusz; Joseph E., Siegel; Julian L.