Range Measurement Apparatus and Method Using Chaotic Uwb Wireless Communication

• US 20080226072A1
• Filed: 05/25/2006
• Published: 09/18/2008
• Est. Priority Date: 12/08/2005
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Kim, Jae-Young, Lee, Cheol-Hyo
• Granted Patent: US 8,175,274 B2
• Time in Patent Office: Days
• 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

Provided is a range measurement apparatus and method based on chaotic ultra wideband (UWB) wireless communication. The apparatus includes a chaotic signal generating/modulating unit for generating/modulating chaotic signals and outputting them to a transceiving unit; a transceiver for transceiving radio signals; a detector for detecting the radio signals in forms of voltage signals; a transformer for sampling the analog voltage signals and outputting first digital signals of a predetermined level; a comparator for comparing levels of the analog voltage signals with a threshold value and outputting second digital signals; and a range measurement unit for calculating a leading edge, which is a moment when initial data of a packet payload arrive, by using the binary signals from transformation of the first digital signals based on the threshold and the second digital signals, and performing range measurement based on the leading edge. This research is applied to chaotic UWB wireless communication.

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 for generating and modulating chaotic signals and outputting the modulated chaotic signals to a transceiving unit;

a transceiving unit for transmitting/receiving radio signals;

a detecting unit for detecting the radio signals inputted from the transceiving unit in the form of voltage signals;

a transform unit for sampling the analog voltage signals inputted from the detecting unit and outputting first digital signals of a predetermined level;

a comparison unit for comparing levels of the analog voltage signals inputted from the detecting unit with a predetermined threshold value and outputting binary digital signals, which are second digital signals; and

a range measurement unit for calculating a leading edge, which is a moment when initial data of a packet payload arrive, by using the binary signals obtained in the transform unit from the transformation of the first digital signals based on the threshold value and by using the second digital signals outputted from the comparison unit, and performing a range measurement calculation based on the leading edge.

2. The apparatus as recited in claim 1, wherein the chaotic signal generating/modulating unit includes:

first and second differential amplifiers for receiving and amplifying positive voltage and negative voltage; and

a chaotic oscillator which includes a band pass filter for filtering output signals of the first and second differential amplifiers.

3. The apparatus as recited in claim 2, wherein the chaotic UWB signals generated in the chaotic oscillator have a center frequency of 4 GHz and a bandwidth ranging from 3 GHz to 5 GHz.

4. The apparatus as recited in claim 1, wherein the chaotic signal generating/modulating unit modulates the chaotic UWB signals having a predetermined data coding sequence by being coded with an additional bit added to originally generated data ‘

1’

or ‘

0.’

5. The apparatus as recited in claim 4, wherein the data coding sequence is ‘

1010’

with respect to data ‘

1,’ and

‘

1000’

with respect to data ‘

0.’

6. The apparatus as recited in claim 1, wherein the range measurement unit estimates a sampling moment of sampled data initially having a value ‘

1’

as an initial leading edge when the first digital signals outputted from the transform unit are transformed into binary signals formed of ‘

0’ and

‘

1’

based on the threshold value;

performs sub-sampling by a predetermined period based on the second digital signals outputted from the comparison unit between the sampled data at the estimated initial leading edge and sampled data right before the sampled data of the initial leading edge to thereby produce sub-sampled data; and

determines a final leading edge based on the sub-sampled data.

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

a) acquiring a leading edge, which is a moment when initial data of a packet payload arrive, by using binary signals obtained in a transform unit from transformation of first digital signals and by using second digital signals outputted from a comparison unit based on a predetermined threshold value; and

b) performing a range measurement calculation based on the leading edge,

wherein the range measurement apparatus includes;

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

a transceiving unit for transmitting/receiving radio signals;

a detecting unit for detecting the radio signals inputted from the transceiving unit in the form of voltage signals;

a transform unit for sampling the analog voltage signals inputted from the detecting unit and outputting first digital signals of a predetermined level;

a comparison unit for comparing levels of the analog voltage signals inputted from the detecting unit with a predetermined threshold value and outputting binary digital signals, which are second digital signals; and

a range measurement unit for calculating a leading edge, which is a moment when initial data of a packet payload arrive, by using the binary signals obtained in the transform unit from the transformation of the first digital signals based on the threshold value and by using the second digital signals outputted from the comparison unit, and performing a range measurement calculation based on the leading edge.

8. The method as recited in claim 7, wherein the step a) includes the steps of:

a1) estimating a sampling moment of sampled data initially having a value ‘

1’

as an initial leading edge when the first digital signals outputted from the transform unit are transformed into binary signals formed of ‘

0’ and

‘

1’

based on the threshold value;

a2) performing sub-sampling by a predetermined period based on the second digital signals outputted from the comparison unit between the sampled data at the estimated initial leading edge and sampled data right before the sampled data of the initial leading edge to thereby produce sub-sampled data; and

a3) determining a final leading edge based on the sub-sampled data.