Method for Stabilising Time Position of an Ultrabandwidth Signal and a Live Object Monitoring Locator for Carrying Out Said Method

• US 20080220732A1
• Filed: 09/26/2005
• Published: 09/11/2008
• Est. Priority Date: 09/28/2004
• Status: Active Grant

• Current Assignee: Gairat Saidkhakimovich Ikramov, Life Sensor Co., Ltd.
• Original Assignee: Gairat Saidkhakimovich Ikramov, Life Sensor Co., Ltd.
• Inventors: Kuramshev, Sergei Vasilevich, Andriyanov, Aleksandr Vladimirovich, Ikramov, Gairat Saidkhakimovich
• Granted Patent: US 7,809,077 B2
• Time in Patent Office: Days
• US Class Current: 455/114.3
• CPC Class Codes: A61B 5/0507 using microwaves or terahertz waves
• CPC Class Codes: G01S 13/0209 Systems with very large relative bandwidth, i.e. larger than 10 %, e.g. baseband, pulse, carrier-free, ultrawideband

Abstract

The invention relates to search and rescue service and can be used for debris active sounding. Said invention makes it possible to improve interference protection related to a temperature, the operator hands motion and trembling effecting the locator operation. The inventive method consists in forming an ultrabandwidth signal (UBW) according to a reference signal, in emitting the thus formed UBW signal to space, in receiving the UBW signal, in processing the UBW signal by correlating it with a reference UBW signal, wherein while processing the received UBW signal, the reference UBW signal is delayed for a time during which the initial position of a check point on a middle section between the maximum and minimum voltage of the correlated signal is set, in periodically monitoring the position of said check point and in modifying the space emission delay of the formed UBW signal when the check point position shifts from the initial position thereof, thereby resetting the check point position.

Claims

1. A method for stabilizing time position of an ultra-wideband signal, comprising shaping an ultra-wideband signal according to a reference signal, emitting a formed ultra-wideband signal to space, receiving an ultra-wideband signal, processing a received ultra-wideband signal by correlating it with said reference ultra-wideband signal, wherein, while processing a received ultra-wideband signal, the said reference ultra-wideband signal being delayed by a time during which an initial position of a check point in a middle range between the maximum and minimum voltages of the correlated signal is set, regularly monitoring a position of said check point, and after the position of the said check point shifts as compared to the initial one a delay in emitting to space the formed ultra-wideband signal is changed, thus resetting the check point position.

2. A method according to claim 1, characterized in that an initial position of a said check point is set before receiving next ultra-wideband signals reflected from an object by emitting a shaped ultra-wideband signal directly into a space area of receiving next ultra-wideband signals reflected from an object.

3. A method according to claim 1, characterized in that an initial position of the said check point is set when an ultra-wideband signal reflected from an immovable object is received.

4. A method according to claim 1, characterized in that as the position of a check point its position in the range of the correlated signal having the maximum steepness is taken, a Uco value of reference correlated voltage is measured at that point, and if current Uc values of correlated voltage become different from the Uco value of the reference correlated voltage, a delay in emitting to space of a formed ultra-wideband signal is changed so as to take into account the current Uc value of correlated voltage, at negative steepness of a correlated signal at the check point and if Uc>

Uco a delay being decreased, and if Uc<

Uco, a delay is increased, or, at positive steepness of a correlated signal at the check point and if Uc>

Uco, a delay being increased, and if Uc<

Uco a delay is decreased.

5. A method according to claim 4, characterized in that the stabilization parameter e is set, which is selected on the condition that Uco voltage exceeds a Un noise level at the said check point.

6. A method according to claim 1, characterized in that a pulse packet is used as an ultra-wideband signal, the form of each pulse corresponding to one period of a harmonic vibration.

7. A method according to claim 6, characterized in that a pulse packet of pseudo-random sequence is used as an ultra-wideband signal.

8. A locator for monitoring living beings, comprising a clock pulse generator, a pseudorandom sequence pulse generator, the first adjustable delay unit, the first ultra-wideband signal pulse shaper made controllable, a transmitting antenna, which are connected in series, the second adjustable delay unit, the second ultra-wideband signal pulse shaper, a mixer, an amplifier, a receiving antenna, the input of the said second adjustable delay unit being connected to the output of the said pseudorandom sequence pulse generator and the output of the said delay being connected to the input of the said second ultra-wideband signal pulse shaper which output being connected to the first input of the said mixer, the said receiving antenna being connected to the input of the said amplifier which output being connected to the second input of the said mixer, an adjustable amplifier, a band-pass filter, an analogue-to-digital converter, which are connected in series, the input of the said adjustable amplifier being connected to the output of the said mixer, a processing unit and a capacitor, one output of the said capacitor being connected to the output of the said mixer and the other output being connected to the housing, the clock input of the said processing unit being connected to the output of the said clock pulse generator and its control input being connected to the output of the said analogue-to-digital converter, the processing unit is made with five control outputs, the first control output of the processing unit is connected to the control input of the first ultra-wideband signal pulse shaper, its second control output is connected to the control input of the first adjustable delay unit, its third control output is connected to the control input of the second adjustable delay unit, its fourth control output is connected to the control input of the adjustable amplifier, and its fifth control output is connected to the control input of the pseudorandom sequence pulse generator, the processing unit is made with the possibility of selecting a modulated component corresponding to the pulse or breath rate of a living being, the said processing unit being made so as to ensure shaping of ultra-wideband signal pulse packets with the possibility of regularly switching on/off according to the control input of the first ultra-wideband signal pulse generator, the said processing unit being made so as to ensure changing a delay according to the control input of the second adjustable delay unit for the purpose of fixing a check point position at a middle range between the maximum and minimum voltages of a correlated signal at the capacitor, the said processing unit being made with the possibility of memorizing that check point position and changing a delay according to the control input of the first adjustable delay unit when that check point position is changed, the said processing unit being made so as to ensure changing a delay according to the control input of the second adjustable delay unit for the purpose of ranging a living being, and the said processing unit being made so as to ensure changing a gain coefficient of the adjustable amplifier for the purpose of compensating for attenuation of an ultra-wideband signal received by the receiving antenna if a distance to a living being is increased.