Back to results
US 12,625,229 B2Granted
Method and arrangement for evaluating a distance between at least two antenna units
AssigneeKoherent Oy
InventorsKari Leppänen, Jussi Salmi
Life of this patent
Estimating the term…
Abstract
A method for evaluating a distance between at least a first antenna unit and a second antenna unit by two-way transmission of at least two signals having different circular polarizations between the antenna units. Phase information is determined and used to determine at least a first phase sum and a second phase sum, where the phase sums are further utilized in determination of at least one distance indicator that is indicative of the distance between the first antenna unit and the second antenna unit.
Claims13
A method for evaluating a distance between at least a first antenna unit and a second antenna unit, the method comprising at least
- transmitting a first signal via the first antenna unit, said first signal comprising a first circular polarization,
- receiving the first signal at the second antenna unit,
- determining first phase information, said first phase information being indicative of a phase of the received first signal with respect to a local oscillator of a radio unit with which the second antenna unit is associated,
- transmitting a first response signal via the second antenna unit, said first response signal essentially corresponding to said first signal,
- receiving the first response signal at the first antenna unit,
- determining first response phase information, said first response phase information being indicative of a phase of the received first response signal with respect to a local oscillator of a radio unit with which the first antenna unit is associated,
- determining a first phase sum being indicative of a sum of the first phase information and the first response phase information,
- transmitting a second signal via one of the first or second antenna units, said second signal comprising a second circular polarization, the second circular polarization being opposite to the first circular polarization,
- receiving the second signal at the other of the first or second antenna unit,
- determining second phase information, said second phase information being indicative of a phase of the received second signal with respect to a local oscillator of the radio unit with which the receiving antenna unit is associated,
- transmitting a second response signal via the other of the first or second antenna units which has not transmitted the second signal, said second response signal essentially corresponding to said second signal,
- receiving the second response signal at the antenna unit that has transmitted the second signal,
- determining second response phase information, said second response phase information being indicative of a phase of the received second response signal with respect to the local oscillator of a radio unit with which the receiving antenna unit is associated,
- determining a second phase sum being indicative of a sum of the second phase information and the second response phase information, and
- determining at least one distance indicator that is indicative of the distance between the first antenna unit and the second antenna unit based on at least the first phase sum and second phase sum.
12 more elements
An arrangement for evaluating a distance between at least a first antenna unit and a second antenna unit, the arrangement comprising at least a first antenna unit associated with a first radio unit, a second antenna unit associated with a second radio unit, and a processor, wherein the arrangement is configured to
- transmit a first signal via the first antenna unit, said first signal comprising a first circular polarization,
- receive the first signal at the second antenna unit,
- determine first phase information, said first phase information being indicative of a phase of the received first signal with respect to a local oscillator of a radio unit with which the second antenna unit is associated,
- transmit a first response signal via the second antenna unit, said first response signal essentially corresponding to said first signal,
- receive the first response signal at the first antenna unit,
- determine first response phase information, said first response phase information being indicative of a phase of the received first response signal with respect to a local oscillator of a radio unit with which the first antenna unit is associated,
- determine a first phase sum being indicative of a sum of the first phase information and the first response phase information,
- transmit a second signal via one of the first antenna unit or second antenna unit, said second signal comprising a second circular polarization, the second circular polarization being opposite to the first circular polarization
- receive the second signal at the other of the first or second antenna unit,
- determine second phase information, said second phase information being indicative of a phase of the received second signal with respect to a local oscillator of the radio unit with which the receiving antenna unit is associated,
- transmit a second response signal via the other of the first or second antenna units, which has not transmitted the second signal, said second response signal essentially corresponding to said second signal,
- receive the second response signal at the antenna unit that has transmitted the second signal,
- determine second response phase information, said second response phase information being indicative of a phase of the received second response signal with respect to the local oscillator of a radio unit with which the receiving antenna unit is associated,
- determine a second phase sum being indicative of a sum of the second phase information and the second response phase information, and
- determine at least one distance indicator that is indicative of the distance between the first antenna unit and the second antenna unit based on at least the first phase sum and second phase sum.
12 more elements
Dependencies are inferred from the claim text.