Circuit and method for distance measurement between two nodes of a radio network
First Claim
1. A method for distance measurement between a first node and a second node of a radio network, the method comprising:
- transmitting a first signal with a first frequency by the first node that is received by the second node by downmixing to a first intermediate frequency;
determining a first value of a first phase for a first frequency value of the first frequency by the second node;
transmitting a second signal with a second frequency by the second node that is received by the first node by downmixing to a second intermediate frequency;
measuring a first value of a second phase for a first frequency value of the second frequency by the first node, the first frequency and the second frequency being changed in that a second frequency value of the first frequency and the first frequency value of the first frequency have a frequency difference and in that a second frequency value of the second frequency and the first frequency value of the second frequency have the frequency difference;
determining a second value of the first phase by the second node for the second frequency value of the first frequency;
determining a second value of the second phase by the first node for the second frequency value of the second frequency, wherein an amount of the first and second intermediate frequency is the same;
spacing apart the first frequency of the first signal and the second frequency of the second signal by the amount of the first and second intermediate frequency; and
calculating a distance between the first node and the second node from the first value and the second value of the first phase and from the first value and the second value of the second phase and from the frequency difference.
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Accused Products
Abstract
A circuit of a node of a radio network, and a method for distance measurement with a transceiver for receiving a first signal with a first frequency by downmixing to an intermediate frequency, with a phase measurement unit, which is set up to determine a first value of a first phase for a first frequency value of the first frequency. The transceiver is formed to transmit a second signal with a first frequency value of a second frequency for determining a first value of a second phase. The control circuit is set up to change the first frequency and the second frequency, in that a second frequency value of the first frequency and the first frequency value of the first frequency have a frequency difference, and whereby a second frequency value of the second frequency and the first frequency value of the second frequency have the frequency difference. The phase measurement unit is set up to determine a second value of the first phase for the second frequency value of the first frequency. The first frequency of the first signal and the second frequency of the second signal are spaced apart by an amount of the intermediate frequency.
40 Citations
10 Claims
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1. A method for distance measurement between a first node and a second node of a radio network, the method comprising:
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transmitting a first signal with a first frequency by the first node that is received by the second node by downmixing to a first intermediate frequency; determining a first value of a first phase for a first frequency value of the first frequency by the second node; transmitting a second signal with a second frequency by the second node that is received by the first node by downmixing to a second intermediate frequency; measuring a first value of a second phase for a first frequency value of the second frequency by the first node, the first frequency and the second frequency being changed in that a second frequency value of the first frequency and the first frequency value of the first frequency have a frequency difference and in that a second frequency value of the second frequency and the first frequency value of the second frequency have the frequency difference; determining a second value of the first phase by the second node for the second frequency value of the first frequency; determining a second value of the second phase by the first node for the second frequency value of the second frequency, wherein an amount of the first and second intermediate frequency is the same; spacing apart the first frequency of the first signal and the second frequency of the second signal by the amount of the first and second intermediate frequency; and calculating a distance between the first node and the second node from the first value and the second value of the first phase and from the first value and the second value of the second phase and from the frequency difference. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A circuit of a node of a radio network, the circuit comprising:
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a transceiver configured to receive a first signal with a first frequency by downmixing to an intermediate frequency; a phase measurement unit configured to measure a first value of a first phase for a first frequency value of the first frequency; and a control circuit; wherein the transceiver is configured to transmit a second signal with a first frequency value of a second frequency, wherein the control circuit is configured to change the first frequency and the second frequency, a second frequency value of the first frequency and the first frequency value of the first frequency have a frequency difference, and a second frequency value of the second frequency and the first frequency value of the second frequency have the frequency difference, wherein the phase measurement unit is configured to measure a second value of the first phase for the second frequency value of the first frequency, wherein the transceiver is configured to transmit the second signal with a second frequency value of the second frequency, wherein the first frequency of the first signal and the second frequency of the second signal are spaced apart by an amount of the intermediate frequency, and wherein the circuit is configured to perform at least one of transmitting the values of the first phase by the transceiver and receiving a first value of a second phase for the first frequency value of the second frequency and a second value of the second phase for the second frequency value of the second frequency. - View Dependent Claims (8, 9)
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10. A system having a first node and a second node of a radio network, the system configured to:
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transmit a first signal with a first frequency by the first node that is received by the second node by downmixing to a first intermediate frequency; determine a first value of a first phase for a first frequency value of the first frequency by the second node; transmit a second signal with a second frequency by the second node that is received by the first node by downmixing to a second intermediate frequency; measure a first value of a second phase for a first frequency value of the second frequency by the first node, the first frequency and the second frequency being changed in that a second frequency value of the first frequency and the first frequency value of the first frequency have a frequency difference and in that a second frequency value of the second frequency and the first frequency value of the second frequency have the frequency difference; determine a second value of the first phase by the second node for the second frequency value of the first frequency; determine a second value of the second phase by the first node for the second frequency value of the second frequency, wherein an amount of the first and second intermediate frequency is the same; space apart the first frequency of the first signal and the second frequency of the second signal by the amount of the first and second intermediate frequency; and calculate a distance between the first node and the second node from the first value and the second value of the first phase and from the first value and the second value of the second phase and from the frequency difference.
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Specification