Method for stabilising time position of an ultrabandwidth signal and a live object monitoring locator for carrying out said method

• US 7,809,077 B2
• Filed: 09/26/2005
• Issued: 10/05/2010
• Est. Priority Date: 09/28/2004
• Status: Expired due to Fees

• 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
• Primary Examiner(s): Payne; David C
• Assistant Examiner(s): File; Erin M
• Application Number:
  US11/720,134
• Publication Number:
  US 20080220732A1
• Time in Patent Office: 1,835 Days
• Field of Search: 375/295, 327/291, 332/106, 341/20
• US Class Current: 375/295
• 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 first reference ultra-wideband signal thus forming a shaped ultra-wideband signal,

emitting the shaped ultra-wideband signal to space,

receiving a received ultra-wideband signal,

processing the received ultra-wideband signal by mixing it with a second reference ultra-wideband signal thus forming a correlated ultra-wideband signal, wherein,

while processing the received ultra-wideband signal, said second reference ultra-wideband signal being delayed by a time during which an initial position of a check point in a middle range between maximum and minimum voltages of the correlated ultra-wideband signal being set,

regularly monitoring a position of said check point, and when the position of said check point shifts from the initial position, a delay in emitting the shaped ultra-wideband signal to space is changed for resetting the position of said check point to the initial position.

2. The method according to claim 1, characterized in that the initial position of the check point is set before receiving next received ultra-wideband signals reflected from an object by emitting the shaped ultra-wideband signal directly to an area where the next received ultra-wideband signals reflected from the object are received.

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

4. The method according to claim 1, characterized in that a pulse packet is used as the ultra-wideband signal, wherein the form of each pulse corresponds to one period of a harmonic vibration.

5. The method according to claim 4, characterized in that the pulse packet of pseudo-random sequence is used as the ultra-wideband signal.

6. A method for stabilizing time position of an ultra-wideband signal, comprising:

shaping an ultra-wideband signal according to a first reference ultra-wideband signal thus forming a shaped ultra-wideband signal,

emitting the shaped ultra-wideband signal to space,

receiving a received ultra-wideband signal,

processing the received ultra-wideband signal by mixing it with a second reference ultra-wideband signal thus forming a correlated ultra-wideband signal, wherein,

while processing the received ultra-wideband signal, said second reference ultra-wideband signal being delayed by a time during which an initial position of a check point in a middle range between maximum and minimum voltages of the correlated ultra-wideband signal being set,

regularly monitoring a position of said check point, and

when the position of said check point shifts from the initial position, a delay in emitting the shaped ultra-wideband signal to space is changed for resetting the position of said check point to the initial position

characterized in that a position of the check point in the range of the correlated ultra-wideband signal having the maximum steepness is taken as the position of the check point,

a value of reference correlated voltage Uco is measured in the check point, and

when a current value of correlated voltage Uc differs from the value of reference correlated voltage Uco, a delay in emitting to space of a formed ultra-wideband signal is changed so as to take into account the current value of correlated voltage Uc, wherein

for negative steepness of the correlated ultra-wideband signal at the check point and Uc>

Uco, the delay being decreased,

for negative steepness of the correlated ultra-wideband signal at the check point and Uc<

Uco, the delay is increased,

for positive steepness of the correlated ultra-wideband signal at the check point and Uc>

Uco, the delay is increased,

for positive steepness of the correlated ultra-wideband signal at the check point and Uc<

Uco, the delay is decreased.

7. The method according to claim 6, characterized in that the stabilization parameter e is set, which is selected on the condition that the Uco voltage exceeds a noise level Un at the said check point.

8. A locator for monitoring living beings, comprising

connected in series a clock pulse generator, a pseudorandom sequence pulse generator, a first adjustable delay unit, a first ultra-wideband signal pulse shaper made controllable, and a transmitting antenna,

further comprising a second adjustable delay unit, a second ultra-wideband signal pulse shaper, a mixer, an amplifier, and a receiving antenna, wherein

an input of said second adjustable delay unit being connected to an output of said pseudorandom sequence pulse generator,

an output of said second adjustable delay unit being connected to an input of said second ultra-wideband signal pulse shaper,

the output of said second ultra-wideband signal pulse shaper being connected to a first input of said mixer,

said receiving antenna being connected to an input of the said amplifier, and

an output of said amplifier being connected to a second input of said mixer,

further comprising connected in series an adjustable amplifier, a band-pass filter, and an analogue-to-digital converter,

wherein an input of said adjustable amplifier being connected to an output of said mixer,

further comprising a processing unit and a capacitor, wherein

one output of said capacitor being connected to the output of said mixer and the other output of said capacitor being connected to a housing,

a clock input of said processing unit being connected to an output of said clock pulse generator and the control input of said processing unit being connected to an output of said analogue-to-digital converter,

the processing unit is made with five control outputs, wherein

its first control output is connected to a control input of the first ultra-wideband signal pulse shaper,

its second control output is connected to a control input of the first adjustable delay unit,

its third control output is connected to a control input of the second adjustable delay unit,

its fourth control output is connected to a control input of the adjustable amplifier, and

its fifth control output is connected to a control input of the pseudorandom sequence pulse generator,

wherein the processing unit is made with the possibility of selecting a modulated component corresponding to the pulse or breath rate of a living being,

said processing unit is made with the possibility to provide 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,

said processing unit is made with the possibility to provide changing a delay according to the control input of the second adjustable delay unit for the purpose of fixing a check point position at the middle range between the maximum and minimum voltages of a correlated signal at the capacitor,

said processing unit is made with the possibility of memorizing the check point position and changing a delay according to the control input of the first adjustable delay unit when the check point position is changed,

said processing unit is made with the possibility to provide changing the delay according to the control input of the second adjustable delay unit for the purpose of ranging a living being, and

said processing unit is made with the possibility to provide 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 the living being is increased.