SYNTHETIC APERTURE RADAR SYSTEM AND METHOD FOR LOCAL POSITIONING
First Claim
1. A method of determining the position of a device relative to a landmark, comprising:
- transmitting a pulse from the device, the pulse having a particular polarization;
receiving a return signal over a period of time, the return signal including a reflected pulse from the landmark, the receiving including preferentially receiving signals having the particular polarization; and
processing the return signal so as to isolate the reflected pulse from the return signal and to determine a range from the device to the landmark;
wherein the reflected pulse from the landmark has a polarization substantially the same as the particular polarization and the return signal includes components not having the particular polarization.
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Accused Products
Abstract
A positioning system includes a passive, isotropic reflecting landmark at a fixed position and a device. The device transmits an electromagnetic pulse having a circular polarization and receives a return signal over a period of time. The return signal includes a reflected pulse from the reflecting landmark. The processes the return signal to isolate the reflected pulse from the return signal and to determine a range from the device to the reflecting landmark. The reflecting landmark includes a first passive reflector, a second passive reflector, and a static structure configured to statically position the second passive reflector at an angle relative to the first passive reflector. The device optionally moves in a particular direction while receiving the return signal, detects a Doppler shift in the reflected pulse portion of the return signal, and determines an angle between the particular direction and a straight line between the device and the landmark.
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Citations
29 Claims
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1. A method of determining the position of a device relative to a landmark, comprising:
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transmitting a pulse from the device, the pulse having a particular polarization;
receiving a return signal over a period of time, the return signal including a reflected pulse from the landmark, the receiving including preferentially receiving signals having the particular polarization; and
processing the return signal so as to isolate the reflected pulse from the return signal and to determine a range from the device to the landmark;
wherein the reflected pulse from the landmark has a polarization substantially the same as the particular polarization and the return signal includes components not having the particular polarization. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A positioning system, comprising
a passive, isotropic reflecting landmark at a fixed position; - and
a device configured to transmit an electromagnetic pulse, the pulse having a polarization;
the device further configured to receive a return signal over a period of time, the return signal including a reflected pulse from the landmark, and to process the return signal so as to isolate the reflected pulse from the return signal and to determine a range from the device to the landmark;
the reflecting landmark comprising;
a first passive reflector for reflecting electromagnetic pulses;
a second passive reflector for reflecting electromagnetic pulses; and
a static structure configured to statically position the second passive reflector at an angle relative to the first passive reflector, wherein the angle is about 90°
. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A positioning system, comprising
a passive, isotropic reflecting landmark at a fixed position; - and
a device configured to transmit an electromagnetic pulse, the pulse having a particular polarization;
the device further configured to receive a return signal over a period of time, the return signal including a reflected pulse from the landmark, and to process the return signal so as to isolate the reflected pulse from the return signal and to determine a range from the device to the landmark;
wherein the reflecting landmark is configured to reflect the electromagnetic pulse so as to produce the reflected pulse with a polarization substantially the same as the particular polarization.
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Specification