Radar system for local positioning
First Claim
1. A method of determining the position of a device relative to an active landmark, comprising:
- transmitting a pulse having a polarization and a first carrier signal frequency from the device;
receiving a return signal over a period of time, wherein the return signal includes a return modulated pulse from the active landmark and the receiving includes preferentially receiving return signals having the polarization; and
processing the return signal so as to isolate the return modulated pulse from the return signal and to determine a range from the device to the active landmark.
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Accused Products
Abstract
A positioning system includes one or more active landmarks and a device. The device transmits an electromagnetic pulse having a polarization and receives return signals over a period of time. The device may preferentially receive return signals having the polarization. The return signals include at least one return modulated pulse from at least one active landmark. The device processes the return signals to isolate the return modulated pulse from the return signals and to determine a range from the device to the active landmark. The device optimally moves in a particular direction while receiving the return signals, detects a Doppler shift in the return modulated pulse portion of the return signals and determines an angle between the particular direction and a straight line between the device and the active landmark.
44 Citations
63 Claims
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1. A method of determining the position of a device relative to an active landmark, comprising:
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transmitting a pulse having a polarization and a first carrier signal frequency from the device;
receiving a return signal over a period of time, wherein the return signal includes a return modulated pulse from the active landmark and the receiving includes preferentially receiving return signals having the polarization; and
processing the return signal so as to isolate the return modulated pulse from the return signal and to determine a range from the device to the active landmark. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A positioning system, comprising
an active landmark, wherein the active landmark includes a modulator; - and
a device configured to transmit an electromagnetic pulse having a polarization and a first carrier signal frequency, to receive a return signal including a return modulated pulse from the active landmark over a period of time, to process the return signal so as to isolate the return modulated pulse from the return signal and to determine a range from the device to the active landmark;
wherein the device preferentially receives return signals having the polarization. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63)
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Specification