Unwrapping and prediction of distance and velocity measurements using carrier signals
First Claim
1. A measurement method, the method comprising:
- transmitting a first signal from an originator device to a transponder device, the first signal having a first carrier frequency;
determining a carrier phase of the first signal at the transponder device;
transmitting a second signal from the transponder device to the originator device, the second signal having a second carrier frequency;
determining a carrier phase of the second signal at the originator device;
estimating a relative distance between the originator device and the transponder device using the carrier phase of the first carrier signal and the carrier phase of the second carrier signal, wherein the relative distance wraps across an upper boundary and a lower boundary;
adjusting the relative distance by unwrapping the relative distance outside at least one of the upper boundary and the lower boundary; and
using the adjusted relative distance to determine a total distance between the originator device and the transponder device.
1 Assignment
0 Petitions
Accused Products
Abstract
Systems and methods for performing distance and velocity measurements, such as by using carrier signals, are disclosed. A measurement method may include transmitting a first signal from an originator device to a transponder device and determining a carrier phase of the first signal at the transponder device. The measurement method may also include transmitting a second signal from the transponder device to the originator device and determining a carrier phase of the second signal at the originator device. The measurement method may include estimating a relative distance between the originator device and the transponder device using the carrier phase of the first carrier signal, the carrier phase of the second carrier signal. The method may also include estimating the relative distance using a frequency difference. The method may include using an adjusted relative distance to determine a total distance between the originator device and the transponder device.
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Citations
24 Claims
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1. A measurement method, the method comprising:
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transmitting a first signal from an originator device to a transponder device, the first signal having a first carrier frequency; determining a carrier phase of the first signal at the transponder device; transmitting a second signal from the transponder device to the originator device, the second signal having a second carrier frequency; determining a carrier phase of the second signal at the originator device; estimating a relative distance between the originator device and the transponder device using the carrier phase of the first carrier signal and the carrier phase of the second carrier signal, wherein the relative distance wraps across an upper boundary and a lower boundary; adjusting the relative distance by unwrapping the relative distance outside at least one of the upper boundary and the lower boundary; and using the adjusted relative distance to determine a total distance between the originator device and the transponder device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A measurement system, comprising:
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an originator device including a first radio, the originator device being configured to transmit a first signal to a transponder device using the first radio, the first signal having a first carrier frequency; the transponder device including a second radio, the transponder device being configured to transmit a second signal to the originator device using the second radio, the second signal having a second carrier frequency; and a processor configured to estimate a relative distance between the originator device and the transponder device using a carrier phase of the first signal at the transponder device and a carrier phase of the second signal at the originator device, the relative distance being bounded by an upper boundary and a lower boundary, adjust the relative distance by unwrapping the relative distance outside at least one of the upper boundary and the lower boundary, and use the adjusted relative distance to determine a total distance between the originator device and the transponder device. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification