Range measurement apparatus and method using chaotic UWB wireless communication

• US 8,175,274 B2
• Filed: 05/25/2006
• Issued: 05/08/2012
• Est. Priority Date: 12/08/2005
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Lee, Cheol-Hyo, Kim, Jae-Young
• Primary Examiner(s): Cervetti, David Garcia
• Application Number:
  US12/065,124
• Publication Number:
  US 20080226072A1
• Time in Patent Office: 2,175 Days
• Field of Search: 380/263
• US Class Current: 380/263
• CPC Class Codes: G01S 13/0209 Systems with very large relative bandwidth, i.e. larger than 10 %, e.g. baseband, pulse, carrier-free, ultrawideband
• CPC Class Codes: G01S 13/106 using transmission of pulses having some particular characteristics G01S13/12, G01S13/22, G01S13/24, G01S13/26, G01S13/28 and G01S13/30 take precedence
• CPC Class Codes: G01S 13/74 Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
• CPC Class Codes: G01S 13/765 with exchange of information between interrogator and responder
• CPC Class Codes: H04L 27/001 using chaotic signals for secret or secure communication H04L9/001

Abstract

An apparatus for measuring a range based on a chaotic ultra wideband (UWB) wireless communication technology is disclosed. The Apparatus includes a chaotic signal generating/modulating unit, a transceiving unit, a detecting unit, a transform unit, a comparison unit, and a range measurement unit. The transform unit converts the analog voltage signal from the detecting unit into digital signals based on a first sampling period. The comparison unit compares the analog voltage signal from the detecting unit with a predetermined threshold value and to output a comparison signal. The range measurement unit is configured to calculate a time point corresponding to a leading edge, which is a moment when initial data of a packet payload arrive, by using the digital signals based on the threshold value and by using the comparison signal, and to perform a range measurement calculation based on the time point corresponding to the leading edge.

Claims

1. An apparatus for measuring a range based on a chaotic ultra wideband (UWB) wireless communication technology, comprising:

a chaotic signal generating/modulating unit configured to generate and modulate a chaotic signal and to output the modulated chaotic signal to a transceiving unit;

the transceiving unit configured to transmit the modulated chaotic signal or to receive a radio signal;

a detecting unit configured to output an analog voltage signal according to the received radio signal;

a transform unit configured to convert the analog voltage signal from the detecting unit into digital signals based on a first sampling period;

a comparison unit configured to compare the analog voltage signal from the detecting unit with a predetermined threshold value and to output a comparison signal; and

a range measurement unit configured to calculate a time point corresponding to a leading edge, which is a moment when initial data of a packet payload arrive, by using the digital signals based on the threshold value and by using the comparison signal, and to perform a range measurement calculation based on the time point corresponding to the leading edge.

2. The apparatus as recited in claim 1, wherein the chaotic signal generating/modulating unit is configured to modulate the chaotic signal based on a data sequence, the data sequence is generated by replacing data “

1”

or data “

0”

in a raw data sequence with predetermined data coding sequences, each of the predetermined data coding sequences has two or more bits.

3. The apparatus as recited in claim 2, wherein the data coding sequence is ‘

1010’

with respect to data ‘

1,’ and

‘

1000’

with respect to data ‘

0.’

4. An apparatus for measuring a range based on a chaotic ultra wideband (UWB) wireless communication technology, comprising:

a chaotic signal generating/modulating unit configured to generate and modulate a chaotic signal and to output the modulated chaotic signal to a transceiving unit;

the transceiving unit configured to transmit the modulated chaotic signal or to receive a radio signal;

a detecting unit configured to output an analog voltage signal according to the received radio signal;

a transform unit configured to convert the analog voltage signal from the detecting unit into digital data based on a first sampling period;

a comparison unit configured to compare the analog voltage signal from the detecting unit with a predetermined threshold value and to output a comparison signal; and

a range measurement unit configured to calculate a time point corresponding to a leading edge, which is a moment when initial data of a packet payload arrive, by using the digital data based on the threshold value and by using the comparison signal, and to perform a range measurement calculation based on the time point corresponding to the leading edge,

wherein the chaotic signal generating/modulating unit comprises;

a differential pair configured to receive and amplify a pair of differential voltage signals, the differential pair including a first amplifier and a second amplifier; and

a chaotic oscillator which includes a band pass filter configured to filter output signals of the first and second amplifiers.

5. The apparatus as recited in claim 4, wherein the chaotic signal generated by the chaotic oscillator has a center frequency of 4 GHz and a bandwidth ranging from 3 GHz to 5 GHz.

6. An apparatus for measuring a range based on a chaotic ultra wideband (UWB) wireless communication technology, comprising:

a chaotic signal generating/modulating unit configured to generate and modulate a chaotic signal and to output the modulated chaotic signal to a transceiving unit;

the transceiving unit configured to transmit the modulated chaotic signal or to receive a radio signal;

a detecting unit configured to output an analog voltage signal according to the received radio signal;

a transform unit configured to convert the analog voltage signal from the detecting unit into digital data based on a first sampling period;

a comparison unit configured to compare the analog voltage signal from the detecting unit with a predetermined threshold value and to output a comparison signal; and

a range measurement unit configured to calculate a time point corresponding to a leading edge, which is a moment when initial data of a packet payload arrive, by using the digital signals based on the threshold value and by using the comparison signal, and to perform a range measurement calculation based on the time point corresponding to the leading edge,

wherein the range measurement unit is configured to;

estimate a sampling moment of a datum of the digital data having value ‘

1’

immediately after a datum of the digital data having value ‘

0’

as an initial time point corresponding to the leading edge;

generate sub-sampled data by performing a sub-sampling according to a second sampling period shorter than the first sampling period on the comparison signal between the sampled moment of the datum having value ‘

1’ and

a sampled moment of the datum having value ‘

0’

; and

determine a final time point corresponding to the leading edge as the time point corresponding to the leading edge based on the sub-sampled data.

7. A method of measuring a range based on a chaotic ultra wideband (UWB) wireless communication technology in a range measurement apparatus, comprising:

acquiring a time point corresponding to a leading edge, which is a moment when initial data of a packet payload arrive, by using digital data obtained by a transform unit from transformation of an analog voltage signal and by using a comparison signal outputted from a comparison unit based on comparing the analog voltage signal with a predetermined threshold value; and

performing a range measurement calculation based on the time point corresponding to the leading edge,

wherein the range measurement apparatus includes;

a chaotic signal generating/modulating unit configured for generating and modulating a chaotic signal and outputting the modulated chaotic signal to a transceiving unit;

the transceiving unit configured for transmitting the modulated chaotic signal or receiving a radio signal;

a detecting unit for outputting the analog voltage signal according to the received radio signal;

the transform unit configured for converting the analog voltage signal from the detecting unit into digital data based on a first sampling period;

the comparison unit configured for comparing the analog voltage signal with the predetermined threshold value to output the comparison signal; and

a range measurement unit configured for calculating the time point corresponding to the leading edge by using the digital data based on the threshold value and by using the comparison signal, and for performing the range measurement calculation.

8. A method of measuring a range based on a chaotic ultra wideband (UWB) wireless communication technology in a range measurement apparatus, comprising:

acquiring a time point corresponding to a leading edge, which is a moment when initial data of a packet payload arrive, by using digital data obtained by a transform unit from transformation of an analog voltage signal and by using a comparison signal outputted from a comparison unit based on comparing the analog voltage signal with a predetermined threshold value; and

performing a range measurement calculation based on the time point corresponding to the leading edge,

wherein the range measurement apparatus includes;

a chaotic signal generating/modulating unit configured for generating and modulating a chaotic signal and outputting the modulated chaotic signal to a transceiving unit;

the transceiving unit configured for transmitting the modulated chaotic signal or receiving a radio signal;

a detecting unit for outputting the analog voltage signal according to the received radio signal;

the transform unit configured for converting the analog voltage signal from the detecting unit into digital data based on a first sampling period;

the comparison unit configured for comparing the analog voltage signal with the predetermined threshold value to output the comparison signal; and

a range measurement unit configured for calculating the time point corresponding to the leading edge by using the digital data based on the threshold value and by using the comparison signal, and for performing the range measurement calculation,

wherein the acquiring the time point corresponding to the leading edge comprises;

estimating a sampling moment of a datum of the digital data having value ‘

1’

immediately after a datum of the digital data having value ‘

0’

as an initial time point corresponding to the leading edge;

generating sub-sampled data by performing sub-sampling according to a second sampling period shorter than the first sampling period on the comparison signal between the sampled moment of the datum having value ‘

1’ and

a sampled moment of the datum having value ‘

0’

; and

determining a final time point corresponding to the leading edge as the time point corresponding to the leading edge based on the sub-sampled data.