NZ725953B2 - Monitoring an object - Google Patents

Abstract

system for tracing of an object, comprises a communication unit (100) which in a normalcy is placed close to the object. The communication unit (100) contains a reader (110). a radio station (120) adapted to communication with a base station (130) and an electrical energy supply (140). The system furthermore has an ID unit (125) in or at the object. The ID unit (125) has a unique ID. and contains a receiver and a transmitter adapted to transmit the unique ID of the chip as a response to an incoming signal from the reader (110). An alarm circuit (115) is placed between the reader (110) and the radio station (120). Alarm circuit is configured to trigger an alarm if the reader does not receive a response from the ID unit. The communication unit (100) may further comprise means for determining the geographical position (position finder) of the radio station (120). In an application for monitoring of animals the energy supply (140) may be charged by a generator which converts motion energy to chemical energy in the energy supply (140). furthermore has an ID unit (125) in or at the object. The ID unit (125) has a unique ID. and contains a receiver and a transmitter adapted to transmit the unique ID of the chip as a response to an incoming signal from the reader (110). An alarm circuit (115) is placed between the reader (110) and the radio station (120). Alarm circuit is configured to trigger an alarm if the reader does not receive a response from the ID unit. The communication unit (100) may further comprise means for determining the geographical position (position finder) of the radio station (120). In an application for monitoring of animals the energy supply (140) may be charged by a generator which converts motion energy to chemical energy in the energy supply (140).

Description

MONITORING AN OBJECT The invention relates to a system and a method for monitoring of an object, more specifically a system which triggers an alarm and tracing in case of indication of theft.

There are many monitoring systems where an identity label is attached to an object, and where the position of the object is determined by means of wireless communication with the identity label. The motion of the object may be estimated by detecting the on of the object at different points of time.

Active and passive REID are examples of a technique which is used with identity labels.

IO e RFID means, that an RFID-chip receives a radio—frequency (RF) reading signal and uses the energy in the reading signal to return its ID and possibly other data.

This technique may for example be used for tracing of luggage on an airport by integrating an RFID-chip into a tag which is attached to luggage. Readers positioned along a conveyor belt can read the hips, and use the information to route the luggage to the right aircraft. A type commercially available passive RFlD-units has about 0.5 mm diameter and has as of a few cm. Both chip and antennas may have a ess of a few tenth of a mm. Such RFID-units can he delivered on film which can be stuck on a surface. Passive RFID are also used among others to identity labeling of animals by implanting a chip the size of a rice grain below the skin of the animal. The unique identity of the RFID chip may later be read out, for instance at a veterinarian, and being associated with the owner and other data in a database. Passive RFlD-chips may thus be relatively small-sized, and therefore are relatively easy to hide in or on an .

However, the range is a substantial constraint for use of passive RFID. The range for passive REID depends on the power of the reading signal, and is usually in the magnitude of a few meters or less.

With active RFID, the RFID-chip has a power supply of its own The range is thus not limited by the power of an incoming signal. d active RFID may need more energy than passive RFID, which means larger and heavier batteries or power supply via a cable.

GPRS (General Packet Radio System) and GPS (Global Positioning System) are examples of systems that can be used to determine the position of an .

GPRS bearing is a service which is offered by major mobile network , and is performed in that a mobile unit is connected to up to three base stations in the mobile network. The base stations determine the signal strength of the mobile unit. As the k owner knows the exact position of the base stations, it is possible to determine the position of the mobile unit by ulation. GPRS-positioning assumes that the mobile unit is switched on and connected to at least one base station. The positioning precision depends on the g between the base stations, and varies in today's GSM- network in Norway from about hundred meters in densely populated areas to a few ters in rural areas. Corresponding systems based on triangulation of a mobile unit may be implemented in different mobile networks, and it is expected that other systems will be preferred if, when or where the density of base ns is greater than in s GSM—network in Norway. It should also be appreciated that “triangulation” hereinafter is not limited to GPRS, but also comprises well~known bearing methods with hand-hold directive antennas which are independent of mobile networks.

GPS is a positioning system in which satellites with known orbital tracks broadcast radio signals with information about their track and precise information about when the signal was transmitted. A GPS receiver on the earth surface which receives signals from multiple satellites can use this information to ine its own position. The GPS receiver can calculate its position with precision of about 7m without corrective signals. The precision may be improved to about 2111 with corrective signals, and to some cm with special equipment. Iridium is a second satellite based positioning system with similar ties. Hereinafter “satellite based positioning system" is used for GPS, Iridium and other ite based oning systems. Common for these systems is that they have a precision of about 10111 or less, and that the broadcasted radio signals of the satellites must be able to reach a receiver.

Battery-powered tracing units which are hidden on or in an asset may for instance be used to locate an automobile, a boat, luggage or other asset after theft. Battery—powered tracing units may also be used to find a pet that has escaped or in a "fetter” with a tracing unit being used to check if a convicted person is located within a defined area.

Chipset and modules for the techniques described so far are commercially available, and prices and ions are constantly d. It is therefore desired to use existing technique as much as possible. A skilled man in the art might select a que which fits to the relevant application.

A general problem with battery-powered units is as mentioned that the amount of energy which can be stored in a battery is limited. It is therefore common to let the II mmulcmm:mNRFortthCUSXUIMMOJLl ian/203x electronics go into hibernation when it is not in active use. US 2004/034470 Al describes a tracing unit that has such a hibernation state in order to save energy, and which is activated by motion. Motion activation may be suitable for theft alarm, but does not fit to trigger wake-up of a tracing unit on an animal which constantly is in motion. Motion activation of a theft protection on, for instance, an automobile, bicycle or boat requires in addition that the user must remember switching off the theft protection prior to he/she moves the automobile, the bicycle or the boat. There is thus a need for a unit which is not activated by motion. ian patent NO 326999 Bl describes a system for monitoring animals where a collar is laid around the neck of an . The collar ses a GPS unit for position , and means for two-way communication with a peripheral communication unit. The system further comprises a communication unit for activation ofand reception of signals from a passive probe implanted into the body of the animal. The probe detects one or more physiological parameters in the animal and communicates these parameters to the communication unit. Alarm is given if a physiological parameter differs from predetermined values. The alarm may be an acoustic signal which is given by means ofa speaker integrated into the collar. This signal is intended to temporarily scare predators, and it is disclosed to be essential that a human arrives at the on shortly after the alarm has occurred. For this objective the alarm can also be sent as a radio signal to the peripheral communication unit.

It is desirable that embodiments ofthe present invention provide an improved system which solves one or more of the problems associated with the prior art.

According to a first aspect of the present invention, there is provided a system for monitoring ofan , comprising a communication unit with an electrical energy supply, a reader, a radio station adapted to communicate with a al over a communication network, and an alarm circuit; and an ID unit in or on the object, which ID unit has a unique ID and contains a receiver and a transmitter adapted to transmit the unique ID of the ID unit as a response to an incoming signal from the reader, and means for position finding, wherein the alarm t is configured to trigger an alarm if the reader does not receive a response from the ID unit, and wherein said communication unit has an ing mode and a g mode, and the communication unit is configured to start the g mode when the alarm is triggered by the alarm circuit.

According to a second aspect of the present invention, there is provided a method for monitoring an object by means of a system as described above comprising the steps of: using the alarm circuit to trigger the alarm ifthe reader does not receive a said response from the ID unit; and setting said communication unit in said tracing mode when the alarm is triggered by the alarm circuit.

An ID unit may be relatively small, and hereby easy to hide in or on an . For example a passive RFID-unit of a type mentioned in the introduction may be used in the invention. By the ID unit being hidden in or at the object, it can in some applications be used to identify the object and/or prove hip, for instance after theft or theft slaughter. A ication unit positioned close to the object can contain larger and/or other ents than a communication unit in or on the object. In a first embodiment the communication unit may e as low as possible power, is operated with energy from a small battery and is attached in a collar of a farm animal or pet. The battery may be charged by a generator which converts motion energy into electrical energy. A broken link between the ication unit and the ID unit may for instance indicate that the animal has ceased to move or that the collar is removed from the animal. In a second embodiment the ID unit may be hidden in a suitcase or other asset, and a battery-operated communication unit is placed in the same asset. A broken link between the communication unit and the ID unit may for instance indicate that the communication unit is removed by a thief who removes visible theft protection s or tracing units. In a third embodiment the communication unit may be mounted in a vehicle, a vessel and is operated with energy from a larger battery, for instance a 12V car y. Alternatively the communication unit may be mounted fixed, for instance in a garage or on a mooring space, and is ed with energy supplied from local mains via a fixed wiring. In this embodiment the alarm may be red when the vehicle or the vessel with the ID unit is removed from the communication unit such that the connection between them is lost. This can indicate theft of for instance a car, a bicycle, a vessel or similar.

In these and other embodiments an alarm may be triggered when the link between the communication unit and the ID unit is lost. The alarm may be sent over a mobile network and trigger a reaction shortly after it red. In a preferred embodiment the communication unit is connected to means for position finding, whereby it is possible to trace the communication unit after theft. Said means for position finding may also be used to locate an animal, an asset or a different object as needed.

The present invention will now be described, by way of non-limiting example only, with reference to the accompanying drawings, briefly described as follows.

Figure I shows a system according to an embodiment of the invention.

Figure 2 shows an embodiment with means for position finding.

Figure 3 shows a generator which may be used in ments of the invention.

The drawings are schematic ple drawings which are intended to illustrate the ion. They are thus not to scale, and a number of details are omitted for better clarity.

Figure 1 shows a system for monitoring an object 200, comprising a communication unit 100 placed close to the object. That can be in a collar strapped to an animal. In another application the communication unit 100 may be mounted in a garage or at a g space as a part of a supeiyisory system for a car, a bicycle, a boat and so forth.

The communication unit contains a reader 110, which in a preferred embodiment is capable of reading a passive hip, for ce of a type which is described in the introduction. A radio station 120 is adapted for communication with a base station 130.

The radio station 120 may for instance be a commercially available chipset which is operable to communicate with a base station 130 in the GSM network. Any existing and future network 150 for communication with mobile units can be used in the t invention. The network 150 is merely a means of transmitting an alarm to the owner or a central, such that it is possible to respond quickly when something happens. In figure 1 the owner or central is represented by a terminal 160, which is operable to receive an alarm, for instance a SMS-message, and transmit an instruction. This is described in more detail below.

An ical energy supply 140, for instance a battery pack or an outlet from the mains, supplies energy to the components in the communication unit. An energy supply 140 in the form of a battery pack may optionally be charged by a generator 300 (figure 3) The generator 300 may for ce convert motion energy into chemical energy in the battery pack, and being part of a system for monitoring animals. In such an application the battery will be charged when the animal is moving, and will not be charged when the animal is resting or is not moving for other reasons. Electrical energy will hereby be available from the energy supply 140, here the battery pack, when the animal with the tor 300 is not moving, while a generator 300 without battery would not be able to alert if the animal ceases to move. The generator is described in more detail in connection with figure 3 below.

The system further comprises an identity unit, hereinafter ID unit, 125 in or at the object, which ID unit 125 has a unique identity label, for instance a serial number or similar. The unique identity label is hereinafter called “unique ID” for convenience.

Additionally, the ID unit 125 contains in on to the unique ID also a receiver and a transmitter adapted to transmit the unique ID of the chip as a response to an incoming signal from the reader 1 10. As mentioned in the introduction, a passive RFID-chip may be ‘JI relatively small. It can thus be hidden relatively easy in or on an object. In a first application a passive RFID-unit may be placed under the skin of an . In different applications the RFID-chip may be hidden under the lining in a suitcase or in other e. on a vehicle, vessel or similar.

The object ive RFID is to avoid a bulky energy . In passive RFID the energy in a radio—frequency signal is used. The man skilled in the art knows that the energy in an omagnetic signal increases tionally with the frequency, and that it is possible to use various frequency bands where the most long-wave read-out signals yield shortest range. The frequency may be increased to for instance microwave level, which transfers more energy, which thus can be used for increased range if desired.

The man d in the art knows that inductive coupling between two coils can transfer energy, without the frequencies necessarily being in the RF range. Passive ID unit consequently means, that each unit which can receive energy wirelessly and use the received energy to return its unique ID, independent of the signal being radio ncy or not. When the ID unit 125 is hidden in or on the object, it can be used to identify the object and/or prove ownership, for instance after theft or theft slaughter. It can also be used to identity a pet that has escaped and been found, such that the owner can be informed.

In the first embodiment described above, no contact between ID unit 125 and the reader l 10 may indicate that the animal has lost the collar or that someone has removed the collar. In the ation where a small ID unit is hidden in the luggage or similar, no contact indicates that someone has removed the visible theft protection, that is the communication unit 100. In the third application the contact is lost between the ID unit 125 and the reader 1 10 when the vehicle or the vessel is removed from the fixed mounted communication unit 100. In all these cases lost contact between the reader 110 and ID- label 125 may te theft. An alarm circuit 1 15 is placed between the reader 110 and the radio station 120. The alami circuit 1 15 triggers an alarm when the reader 110 does not e contact with the ID unit 125. That can be an audible or visible alami, and/or a message which is sent to a predetermined receiver, represented by terminal 160, over the communication network 150. When the alarm is triggered, it is advantageous to reSpond quickly, such that the animal can get a new collar before it has moved too far or such that the chances to solve a theft or theft slaughter are increased. In preferred embodiments the alarm unit 115 therefore transmits a e through the communication network 150, for instance a SMS—message in a GSM~network. One possible consequence is that searches and/or tracing are d.

Some embodiments of the system have therefore means for position finding. This is described in more detail in connection with figure 2 below. Embodiments where the system lacks own means for position finding, and thus tracing, is particular suitable in ations where a vehicle or vessel is equipped with g means in advance, for instance a GPS unit that can be used to trace the object when the alarm is triggered. GPS- units with tracing functions are commercially available, and become constantly more common in cars and boats.

Generally, a terminal 160 may receive alarms 01' messages from the alarm circuit 115 through a communication network 150, and transmit instructions over the same network as illustrated by pointers between the radio station 120, the base n 130 the communication network 150 and the terminal 160 in figure 1. The terminal may for instance transmit instructions to the communication unit 100 to set the radio transmitter 120 in triangulation mode, as described in more detail below. Other transmitted instructions may go to a GPS unit outside the system which is bed here, for instance an instruction to said unted GPS-unit in a. car or boat to launch tracing. The alarm circuit 115 transmits as ned preferably an alarm through the communication network. In favourable embodiments the alarm circuit 115 has also control functions which can accept instructions, for instance via SMS—message, from an authorized user.

The instruction may for instance get the alarm circuit 1 15 to launch an audio signal such that it is most easily possible to locate the ication unit in the terrain, and/or enable tracing. Tracing may for ce be enabled by the ication unit 120 being set into triangulation mode, which is described in more detail below, and/or in that a relatively energy demanding on finding unit is activated and starts to determine its position based on satellite signals. In another example an instruction from an authorized user may stop the alarm when the user has forgotten that the theft alarm is ed on, and has driven or cycled away from the communication unit 100. Obviously, it is important that the authorized user is duly authenticated, such that no third party can switch off alarms or transmit other instructions to the alarm unit. The man skilled in the art knows that secure authentication requires something the user owns, for instance a cell phone with a unique identity in a network and/or a certificate, and something the user has knowledge about, for instance a PIN-code or a password. Methods and equipment for authentication are outside the scope of this ion, and the choice of suitable ent is thus left to the man skilled in the art.

In embodiments where the communication unit 100 is fixed mounted, one knows where the communication unit is located, and it is unnecessarily expensive to equip it with a on finding unit of its own. As described above, a position finding unit might already be installed in a e or vessel.

Figure 2 illustrates an embodiment suitable for deployments wherein the communication unit 100 is movable, for instance on an animal or in a suitcase. In figure 2 the communication unit 100 is equipped with means for position finding 170, which is used to ine the geographical position of the radio station 120, and thus the communication unit 100. Said means for position finding 170 may be in a first embodiment a radio transmitter which is used for ulation, for example by use of GPRS or handhold direction-sensitive aerials as described above. The radio transmitter 120 can be used for triangulation, and may for this objective have an (optional) triangulation mode. The idea here is that the communication unit l00 has an operating mode with relatively low energy consumption; where the energy consumption among others is limited by a power-saving function which de-activates the transmitter 120 most of the time, and where the radio station 120 is revived and connects to the network for example once an hour or more rarely. In triangulation mode the power-saving on is deactivated such that the transmitter 120 its more often, such that it is possible to ulate. Depending on the desired oning precision GPRS or similar may be replaced by, or be supplemented by a position finding unit, which itself determines its position by means of a satellite based positioning system. Said means for position finding 170 can in other words comprise for example receivers for GPS or Iridium in addition to or instead of a radio transmitter for triangulation. The desire for precise position must be weighted against the need to save energy in the cases where the energy supply 140 is a battery pack on an animal and not an outlet from the mains or a large car battery. It is left to the man skilled in the art ing an energy supply 140 and a possible position finding unit 170 which fits the relevant application.

Figure 3 is a principle drawing of a generator 300 which converts motion energy into electrical energy, and a communications unit 100 with a battery pack which corresponds to the electrical energy supply 140 in the appended patent claims. The generator 300 has a permanent magnet 310 which capable of being moved in a coil 320, for example forth and back as illustrated by double arrow. The letters N and S are merely intended to indicate that the element 320 is a permanent magnet with a north pole N and a south pole S. The polarity and the design otherwise has no special significance. When the magnet 310 is moved inside the coil 320, a current is induced, and the electrical energy is transferred to the battery pack which represents the electrical the energy supply 140 in the patent .

The permanent magnet 320 is in figure 3 suspended with a spring 330. The kinetic energy which can be erred from the generator 300 to the y 140 is proportional with the mass of the magnet and field strength. Permanent magnets based on one of the so-called rare-earth materials, that are element of the lanthanite-group or scandium or yttrium, are suitable due to relatively high field strength. Nowadays, for ce, a l neodymium-magnet may have a field strength of l - 1,4T and vely low price. The energy consumption of the ication unit 100 during 24 hours determines how much energy that must be transferred from the generator 300 during 24 hours. The energy consumption depends among others from how often it is desirable or necessary to communicate with the communication network 150 (figure 1), from mean distance to the base stations, that must be expected to increase in rural areas, and of con‘esponding frequency and power which is needed to update the status for the ID-chip 125. When the energy consumption throughout 24 hours is known, the mean power of the generator can be calculated. In non-moving applications it is possible to supply power of for ce 5 V x 80mA = 400mW from the ordinary mains. In applications where the generator 300 is mounted in a collar of an animal, supplied power may be estimated by dividing with the time one may expect that the animal is . ent species have different motion patterns and resting periods.

In addition a large animal can carry a larger generator than a cat or dog. The size has significance among others for the mass of the permanent magnet 310 and diameter of the coil 320. Such a greater mass and larger er is expected to compensate for, that big animals generally are expected to move slower than small animals.

It is possible to connect more sensors, for example a temperature measurement unit, a motion measurement unit, an accelerometer and/or a pulse measuring unit which can give thither information about the condition of an animal or a different . The sensors can be monitored and controlled, for instance h the alarm unit 115, the radio station 120 and the communication network 150 as described in connection with figure 1 above. The main tion for the number of sensors is nowadays the battery capacity, but it is expected that this may change as a uence of ss in miniaturezation and battery technology.

While various embodiments of the t invention have been described above, it should be understood that they have been presented by way of example only, and not by way of limitation. It will be apparent to a person skilled in the relevant art that various changes in form and detail can be made therein without departing from the spirit and scope of the invention. Thus, the present invention should not be limited by any of the above described exemplary embodiments. hout this specification and the claims which follow, unless the context requires otherwise, the word "comprise", and variations such as "comprises" and "comprising", will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.

The nce in this specification to any prior publication (or ation derived from it), or to any matter which is known, is not, and should not be taken as an acknowledgment or admission or any form of suggestion that that prior publication (or infonnation derived from it) or known matter forms part of the common general knowledge in the field of endeavour to which this specification relates.

THE

Claims (9)

CLAIMS DEFINING THE INVENTION ARE AS S:

1. System for monitoring of an object, comprising a communication unit with an electrical energy supply, a , a radio station adapted to communicate with a terminal over a communication k, and an alarm circuit; an ID unit in or on the object, which ID unit has a unique 1D and contains a receiver and a transmitter adapted to transmit the unique ID ofthe ID unit as a response to an incoming signal from the reader, and means for position finding, wherein the alarm circuit is configured to trigger an alarm ifthe reader does not receive a se from the ID unit, and wherein said communication unit has an operating mode and a tracing mode, and the communication unit is configured to start the tracing mode when the alarm is triggered by the alarm circuit.

2. System according to claim 1, wherein said means for position finding comprise means for triangulation, and said tracing mode includes a triangulation mode wherein the radio station transmits more often than when the communication unit is in operating mode.

3. System according to claim 2, wherein said means for triangulation includes means for determining signal strength associated with communication with a plurality of base stations with known positions.

4. System according to any one of the claims 1 to 3, wherein said means for position finding comprise means for satellite based positioning, and said g mode includes said means for satellite based positioning being active and determining its position based on satellite signals.

5. System according to any one of the claims 1 to 4, wherein the alarm circuit is configured to use the radio n to transmit an alarm through the communication k to the terminal and to receive an ction from the terminal, said instruction being an instruction to set the ication unit in tracing mode. l! \5\l\1n[cmo\CNNRPOan‘DCOSXU l614 504 l_ I docv 1 4.102121! l K

6. System according to any one of the claims 1 to 5, wherein said alarm circuit is connected to the reader and the radio station, and said means for position finding is part of or connected to said communication unit.

7. System according to any one of the preceding claims, further comprising a sensor attached to the object, and wherein the sensor is ed from a group consisting of a temperature measurement unit, motion measurement unit, an accelerometer and a pulse measuring unit.

8. Method for monitoring an object by means of a system according to any one of the preceding claims, comprising the steps of: using the alarm t to trigger the alarm ifthe reader does not receive a said response from the ID unit; and setting said ication unit in said g mode when the alarm is triggered by the alarm circuit.

9. Method according to claim 8, further comprising: using the radio station to transmit an alarm through the communication network to the terminal as part of the step of triggering the alarm; using the radio station to receive an instruction to set the communication unit in tracing mode from the terminal; and performing the step of setting the ication unit in a tracing mode only subsequent to receiving said instruction from the terminal.