CN109975752A - A kind of phase shift rangefinder method - Google Patents
A kind of phase shift rangefinder method Download PDFInfo
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- CN109975752A CN109975752A CN201910229575.3A CN201910229575A CN109975752A CN 109975752 A CN109975752 A CN 109975752A CN 201910229575 A CN201910229575 A CN 201910229575A CN 109975752 A CN109975752 A CN 109975752A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
- G01S11/02—Systems for determining distance or velocity not using reflection or reradiation using radio waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
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Abstract
The present invention relates to wireless distance finding and field of locating technology, disclose a kind of phase shift rangefinder method.It creates through the invention, it can be based on the local distance to measuring distance of target equipment of measuring difference of phases between receiving and transmitting signal, and in ranging process, due to being to carry out ranging using interaction response mode, measuring distance of target equipment be can specify to receive and feed back modulated signal, so that ranging has specified property or directive property, and the adverse effect that will not be interfered with air quality during transmitting-receiving due to sinusoidal modulation signal, therefore in final signal processing without the problems such as considering multipath reflection and multipath fading, so that the requirement in terms of data-handling capacity can be substantially reduced in range unit side, it only needs to pass through analog-modulated, demodulation, phase demodulation and simple operation processing can be obtained final distance measurement result, it can be conducive to low-cost design hardware, it is particularly suitable for RFID of Internet-of-things positioning system.
Description
Technical field
The invention belongs to wireless distance finding and field of locating technology, and in particular to one kind is suitable for RFID of Internet-of-things positioning system
Phase shift rangefinder method.
Background technique
Wireless distance finding is a kind of distance measuring method based on electromagnetic wave application technology, in wireless location, wireless measurement, wireless spy
The fields such as survey have a wide range of applications.After completing wireless distance finding, range information can be further utilized, is realized to target
Messaging parameter is adaptively adjusted etc. in locating and tracking.Wireless distance finding is a kind of important distance measuring method, with infrared distance measurement, laser
The technologies such as ranging are compared, and wireless distance finding can organically combine together with wireless communication system, form communication distance measuring integration
System.With becoming increasingly popular for wireless network, wireless distance finding technology will be got more and more applications.
Radio frequency identification, RFID (Radio Frequency Identification) technology, also known as radio frequency identification are
A kind of communication technology, is commonly called as electronic tag, and specific objective can be identified by radio signals and reads and writes related data.Current RFID
Technology has been widely used in every field, for example, sale of goods, transport, production, waste management, postal tracking, aviation row
The fields such as Li Guanli, vehicle toll management, traditional paper tape bar code because its storage capacity is small, cannot rewrite the disadvantages of, knowing
Other field, is slowly substituted by RFID system.
One typical RFID of Internet-of-things positioning system is by locating base station, locator and target positioning device (i.e. electronics
Label) composition, wherein the locator be used to obtain using wireless distance finding technology it is local to the space of target positioning device away from
From locating base station is used for the known location according to locator and its space length to target positioning device, passes through at such as 3 points
The exact position of the acquisition target positioning device such as location algorithm.Existing wireless distance finding technology be generally basede on wireless signal reflection or
RSSI (Received Signal Strength Indication, received signal intensity instruction) carries out ranging, the former due to
Lack directive property or specified property (carrying out ranging for some specific positioning target device), and needs to consider that multipath reflection is asked
Topic, thus it is more demanding to the data-handling capacity of ranging side, it is unfavorable for low-cost design locator and locating base station, while
Reflection ranging can not be carried out to hidden target positioning device；Although the latter can survey hidden target positioning device
Away from, but need to consider influence of the propagation path to signal fadeout (such as the greasy weather is larger to wireless signal influence of fading, and fine day
It is smaller to wireless signal influence of fading) and multipath fading problem, therefore equally the data-handling capacity of range unit side is wanted
It asks higher, is unfavorable for low-cost design locator and locating base station, seriously constrain specifically answering for RFID of Internet-of-things positioning system
With and promote, Internet of Things of be not particularly well suited for being arranged in the places such as the mountain area or harbour and coverage area between 30M~3KM
In net RFID location system, it is therefore necessary to provide a kind of ability of data processing require it is low and conducive to low-cost design hardware
New distance measuring method or new range unit and new definition method or new definition system.
Summary of the invention
In order to solve existing range unit side data processing capability requirements in the presence of RFID of Internet-of-things positioning system
The problems such as high and hardware cost is big, it is an object of that present invention to provide a kind of phase type surveys suitable for RFID of Internet-of-things positioning system
Away from method.
The technical scheme adopted by the invention is as follows:
A kind of phase shift rangefinder method, includes the following steps:
S101. ranging initiation message is generated, wherein the ranging initiation message includes the first measuring distance of target device address
Information, the first measuring distance of target device address information, which is used to indicate, to be needed to immediately enter the measuring distance of target of ranging response mode and sets
It is standby；
S102. the ranging initiation message is transmitted wirelessly on the first channel；
S103. sinusoidal modulation signal and descending carrier signal are generated, wherein the frequency of the sinusoidal modulation signal between
Between 10K~1MHz, the frequency of the descending carrier signal is between 300M~3GHz；
S104. analog-modulated is carried out to the sinusoidal modulation signal and the descending carrier signal, obtains the modulated letter of downlink
Number；
S105. the downlink modulated signal is transmitted wirelessly on the downlink channel；
S106. up channel, uplink modulated signal of the wireless receiving from measuring distance of target equipment, wherein on described are listened to
Row modulated signal is in measuring distance of target equipment side to the sinusoidal modulation signal and generation demodulated from the downlink modulated signal
Up-link carrier signal carry out modulated signal obtained from analog-modulated, the frequency of the up-link carrier signal between 300M~
Between 3GHz；
S107. the Sine Modulated that the sinusoidal modulation signal demodulated from the uplink modulated signal is from a locally generated is believed
Number carry out phase demodulation, obtain phase difference；
S108. the local distance to measuring distance of target equipment is calculated according to following formula:
In formula, Δ φ is phase difference, f0For the frequency of the sinusoidal modulation signal, Δ t is fixing process delay, and c is light
Speed.
Optimization, the ranging initiation message also includes down channel unique identification and/or up channel unique identification.
Optimization, when the first measuring distance of target device address information indicates multiple measuring distance of target equipment, the ranging
Initiation message also includes and the one-to-one up channel unique identification of each measuring distance of target equipment.
Optimization, the ranging initiation message also includes ranging starting duration information, wherein the ranging starting duration
Information is used to indicate the maximum time that measuring distance of target equipment maintains ranging response mode.
Optimization, further include following steps before the step S106:
S601. measuring distance of target equipment is after receiving the ranging initiation message, if it is determined that the first measuring distance of target equipment
Address information and local device address matching then enter ranging response mode: executing subsequent step S602~S604；
S602. monitors downlink channel, and when wireless receiving is to the downlink modulated signal, from the downlink modulated signal
In demodulate sinusoidal modulation signal；
S603. the sinusoidal modulation signal demodulated from the downlink modulated signal and the up-link carrier locally generated are believed
Number carry out analog-modulated, obtain uplink modulated signal；
S604. the uplink modulated signal is transmitted wirelessly on the uplink channel.
It advanced optimizes, further includes following steps before the step S601:
S600. measuring distance of target equipment is after receiving specified wakeup message, and the first channel is listened in starting, wherein the finger
Determining wakeup message includes and the matched specified wake-up device address information in measuring distance of target device address.
Optimization, after the step S105, if not receiving the uplink modulated signal within the significant response time,
It terminates and transmits wirelessly the downlink modulated signal.
Optimization, further include following steps after the step S108:
S109. ranging end message is generated, and transmits wirelessly the ranging end message on a second channel, wherein institute
Stating ranging end message includes the second measuring distance of target device address information, and the second measuring distance of target device address information is used for
Instruction needs to be immediately finished the measuring distance of target equipment of ranging response mode.
It advanced optimizes, if in the ranging initiation message including measuring distance of target equipment group address message, institute
Stating the second measuring distance of target device address information is measuring distance of target tables of equipment address contents or measuring distance of target device cluster address contents.
It advanced optimizes, the ranging end message also includes long letter when continuing waiting for duration information or sleeping immediately
Breath, wherein described to continue waiting for duration information and be used to indicate that measuring distance of target equipment is needed to continue to listen to the duration of working channel, institute
It states sleep duration information immediately and is used to indicate the duration for needing measuring distance of target equipment to immediately enter sleep pattern.
The invention has the benefit that
(1) the invention provides a kind of novel phase shift rangefinder method, can be based between receiving and transmitting signal
The local distance to measuring distance of target equipment of measuring difference of phases, and in ranging process, due to being carried out using interaction response mode
Ranging, it is possible to specify measuring distance of target equipment receives and feeds back modulated signal, so that ranging has specified property or directive property, and by
In the adverse effect that sinusoidal modulation signal will not be interfered during transmitting-receiving with air quality, therefore in final signal processing
Shi Wuxu considers the problems such as multipath reflection and multipath fading, so that can substantially reduce in range unit side in data-handling capacity side
The requirement in face, it is only necessary to which being handled by analog-modulated, demodulation, phase demodulation and simple operation can be obtained final distance measurement result, can be conducive to
Low-cost design hardware is particularly suitable for RFID of Internet-of-things positioning system；
(2) the phase shift rangefinder method also have can multiple target simultaneously ranging, be conducive to measuring distance of target device energy conservation and
The advantages that flexible in application, is convenient for practical promotion and application.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the flow diagram of phase shift rangefinder method provided by the invention.
Fig. 2 is the coherent signal waveform diagram of phase shift rangefinder method provided by the invention.
Fig. 3 is the correlated channels time diagram of phase shift rangefinder method provided by the invention.
Fig. 4 is the structural schematic diagram of the range unit provided by the invention for realizing phase shift rangefinder.
Fig. 5 is the structural schematic diagram of the range-measurement system provided by the invention for realizing phase shift rangefinder.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the present invention is further elaborated.It should be noted that for this
The explanation of a little way of example is used to help understand the present invention, but and does not constitute a limitation of the invention.It is disclosed herein specific
Structure and function details is only used for description example embodiments of the present invention.However, this hair can be embodied with many alternative forms
It is bright, and be not construed as limiting the invention in embodiment set forth herein.
It will be appreciated that though term first, second etc. can be used herein to describe various units, these units are not answered
When being limited by these terms.These terms are only used to distinguish a unit and another unit.Such as it can be single by first
Member is referred to as second unit, and similarly second unit can be referred to as first unit, real without departing from example of the invention
Apply the range of example.
It should be appreciated that the terms "and/or", only a kind of incidence relation for describing affiliated partner, expression can be with
There are three kinds of relationships, for example, A and/or B, can indicate: individualism A, individualism B exist simultaneously tri- kinds of situations of A and B,
The terms "/and " are to describe another affiliated partner relationship, indicate may exist two kinds of relationships, can be with for example, A/ and B
Indicate: two kinds of situations of individualism A, individualism A and B, in addition, character "/" herein, typicallying represent forward-backward correlation object is
A kind of "or" relationship.
It should be appreciated that when by unit referred to as with another unit " connection ", " connected " or " coupling " when, it can with it is another
A unit is directly connected or couples or temporary location may exist.Relatively, it is referred to as with another unit " directly when by unit
It is connected " or when " direct-coupling ", temporary location is not present.It should explain in a similar manner for describing the relationship between unit
Other words (for example, " ... between " to " between directly existing ... ", " adjacent " is to " direct neighbor " etc.).
Terms used herein are only used for description specific embodiment, and are not intended to limitation example embodiments of the present invention.
As it is used herein, singular "a", "an" and "the" is intended to include plural form, unless context is explicitly indicated
Contrary.It should also be understood that term " includes ", " including ", "comprising", and/or " containing " are as used herein,
Specified stated feature, integer, step, operation, unit and/or component existence, and be not excluded for it is one or more its
His feature, quantity, step, operation, unit, component and/or their combination existence or increase.
It will be further noted that the function action occurred may be with the sequence of attached drawing appearance in some alternative embodiments
It is different.Such as it depends on substantially being executed concurrently in related function action, or sometimes can be with
Opposite sequence executes continuously show two figures.
Specific details is provided, in the following description in order to which example embodiment is understood completely.However ability
Domain those of ordinary skill is it is to be understood that implementation example embodiment without these specific details.Such as it can be
System is shown in block diagram, to avoid with unnecessary details come so that example is unclear.It in other instances, can not be with need not
The details wanted shows well-known process, structure and technology, to avoid making example embodiment unclear.
Embodiment one
As shown in Figures 1 to 3, the phase shift rangefinder method provided in this embodiment can be, but not limited to include following step
Suddenly.
S101. ranging initiation message is generated, wherein the ranging initiation message includes the first measuring distance of target device address
Information, the first measuring distance of target device address information, which is used to indicate, to be needed to immediately enter the measuring distance of target of ranging response mode and sets
It is standby.
In the step S101, the ranging initiation message for inform recipient's (i.e. measuring distance of target equipment) immediately into
Enter ranging response mode: then first monitors downlink channel and wireless receiving downlink modulated signal are obtained according to the downlink modulated signal
To uplink modulated signal, the uplink modulated signal is finally transmitted wirelessly on the uplink channel.The up channel and the downlink
Channel is respectively the dedicated channel different from subsequent first channel, they can be defaulted by standard agreement, can also be in the survey
Away from being specified in initiation message, that is, optimize, the ranging initiation message also include down channel unique identification and/or on
Row channel unique identification, wherein the down channel unique identification is used to indicate the downlink letter that measuring distance of target equipment needs to listen to
Road, the up channel unique identification is used to indicate the up channel that measuring distance of target equipment carries out feedback response, so as to reality
Now the purpose of dynamic agreement down channel and/or up channel, application flexibility are strong.
In the step S101, for the purpose of quick distance measurement, can disposably it start simultaneously to multiple ranging mesh
Marking device carries out phase shift rangefinder, and for multiple measuring distance of target equipment, they can listen to the same downlink simultaneously
Channel, but in order to avoid multiple uplink modulated signals occur interferes with each other problem, it is necessary to it is directed to each measuring distance of target equipment
Corresponding up channel is specified, that is, is optimized, when the first measuring distance of target device address information indicates that multiple measuring distance of target are set
When standby, the ranging initiation message also includes and the one-to-one up channel unique identification of each measuring distance of target equipment.
In the step S101, for energy saving purpose, optimization, the ranging initiation message also includes ranging starting
Duration information, wherein the ranging starting duration information is used to indicate the maximum that measuring distance of target equipment maintains ranging response mode
Duration.Thus it can make measuring distance of target equipment after entering ranging response mode, if under not receiving wirelessly on the down channel
Row modulated signal does not receive other end messages yet, can exit ranging response mould according to the ranging starting duration information timing
Formula so as to timely suspend mode or is transferred to other modes.
S102. the ranging initiation message is transmitted wirelessly on the first channel.
Measuring distance of target equipment in the step S102, for energy saving purpose, in RFID of Internet-of-things positioning system
(i.e. electronic tag) generally periodically suspend mode and can listen to first channel, ensure that starting measuring distance of target equipment
Carry out ranging response mode, optimization, on the first channel and within the first period continuity the period send multiple surveys
Away from initiation message, wherein the duration of first period is greater than the sleep cycle of measuring distance of target equipment, and the sleep cycle includes
The sending cycle of the sleep time of measuring distance of target equipment and the first channel sense duration, the ranging initiation message is less than ranging mesh
First channel sense duration of marking device.Due to first period duration be greater than measuring distance of target equipment sleep cycle and
The sending cycle of the ranging initiation message is less than the first channel sense duration of measuring distance of target equipment, it can be ensured that measuring distance of target
Equipment can completely receive the ranging initiation message in the first channel sense duration of any one sleep cycle, prevent
Now starting is omitted.Citing, if a length of 100ms when first channel sense, the sleep time is 3900ms, then ranging mesh
The sleep cycle of marking device is 4 seconds, and the sending cycle may be designed as 60ms (assuming that the transmission duration of the ranging initiation message
For 50ms, the time slot spacing of 10ms is reserved), the duration of first period may be designed as 4020ms, can continuously transmit 67 times
The ranging initiation message.It advanced optimizes, the ranging initiation message also includes the first period duration information and current
Message tranmitting data register information, wherein the current message tranmitting data register information is used to indicate from the initial time of the first period
To the timestamp of current message sending instant.It is configured by aforementioned information, non-ranging target device or measuring distance of target equipment are obtaining
After taking the first period duration information and current message tranmitting data register information, it is known that ranging initiation message described in epicycle
The end time is sent, it is possible thereby to which a longer dormancy time is arranged, is conducive to device energy conservation, especially for non-ranging target
Equipment or completed uplink modulated signal feedback measuring distance of target equipment (may be simply referred to as distance-measuring equipment) for, due to being not necessarily to
Ranging response is carried out, is waken up again after can directly sleeping transmission.
In the step S102, since the ranging initiation message can externally inform it for survey by message Frame Properties
Away from initiation message, therefore for measuring distance of target equipment, it may not be necessary to know the identity of the sender of the ranging initiation message
And/or the group identities of recipient, therefore optimize, the ranging initiation message also may include source address invalid bit and/or
Measuring distance of target equipment group address invalid bit, wherein the source address invalid bit is used to indicate in the ranging initiation message not
There are source address information, measuring distance of target equipment group address invalid bit is used to indicate to be not present in the ranging initiation message
Measuring distance of target equipment group address message, the source address information are used to indicate the identity of the sender of the ranging initiation message, institute
State the group identity that measuring distance of target equipment group address message is used to indicate measuring distance of target equipment.Pass through aforementioned ranging initiation message
Address default configuration, can effectively shorten message-length (can generally shorten 4 bytes or 8 bytes) and send duration, can not only mention
High channel utilization rate, can also effectively shorten the first channel sense duration of measuring distance of target equipment, further be conducive to device energy conservation.
S103. sinusoidal modulation signal and descending carrier signal are generated, wherein the frequency of the sinusoidal modulation signal between
Between 10K~1MHz, the frequency of the descending carrier signal is between 300M~3GHz.
In the step S103, the sinusoidal modulation signal and the descending carrier signal can pass through existing crystal oscillator list
Member and related multiplier unit generate.
S104. analog-modulated is carried out to the sinusoidal modulation signal and the descending carrier signal, obtains the modulated letter of downlink
Number.
In the step S104, analog-modulated is conventional modulation techniques, such as amplitude modulation technique, phase-modulation skill
Art or frequency modulating technology etc., as shown in Figures 2 and 3, citing use amplitude modulation technique.
S105. the downlink modulated signal is transmitted wirelessly on the downlink channel.
In the step S105, since the present embodiment is to carry out phase shift rangefinder, in order to ensure final distance measurement result is
It is accurate believable, preferably need to guarantee half of range unit to the spacing of measuring distance of target equipment no more than the sinusoidal modulation signal
A wavelength, optimization, make effective covering radius of the downlink modulated signal no more than described by transmission power control mode
The half wavelength of sinusoidal modulation signal, i.e., it is modulated to limit the downlink by transmission power control mode (it is the prior art)
Effective covering radius of signal, it can be ensured that only the measuring distance of target equipment in coverage area can respond feeding back uplink modulated signal,
Keep final distance measurement result correctly credible.In addition, also correcting final distance measurement result in combination with existing RSSI ranging technology.
After the step S105, considering measuring distance of target equipment, there may be disappear because not receiving the ranging starting such as
The case where ceasing or receive the reasons such as the downlink modulated signal and not successfully feeding back uplink modulated signal, in order to avoid meaningless energy
Amount consumes and continues ranging, optimization, if not receiving the uplink modulated signal within the significant response time, terminates nothing
Line sends the downlink modulated signal.
S106. up channel, uplink modulated signal of the wireless receiving from measuring distance of target equipment, wherein on described are listened to
Row modulated signal is in measuring distance of target equipment side to the sinusoidal modulation signal and generation demodulated from the downlink modulated signal
Up-link carrier signal carry out modulated signal obtained from analog-modulated, the frequency of the up-link carrier signal between 300M~
Between 3GHz.
Before the step S106 and in measuring distance of target equipment side, also need to include the following steps: that S601. measuring distance of target is set
It is standby after receiving the ranging initiation message, if it is determined that the first measuring distance of target device address information and local device address
Match, then enter ranging response mode: executing subsequent step S602~S604；S602. monitors downlink channel, and arrived in wireless receiving
When the downlink modulated signal, sinusoidal modulation signal is demodulated from the downlink modulated signal；S603. to from the downlink
It adjusts the sinusoidal modulation signal demodulated and the up-link carrier signal locally generated in signal to carry out analog-modulated, it is modulated to obtain uplink
Signal；S604. the uplink modulated signal is transmitted wirelessly on the uplink channel.In addition, if continuous not within the first period
Property the period send multiple ranging initiation messages, then need before the step S601, wake up measuring distance of target equipment, i.e.,
Further include following steps: for S600. measuring distance of target equipment after receiving specified wakeup message, the first channel is listened in starting, wherein
The specified wakeup message includes and the matched specified wake-up device address information in measuring distance of target device address.Described specify is called out
Message of waking up is used to send on waking up channel and the measuring distance of target equipment of wake-up period sleep, ensures that and wakes up ranging mesh
Marking device can refer to the ranging initiation message in the sending method waken up on channel, repeat no more in this.
S107. the Sine Modulated that the sinusoidal modulation signal demodulated from the uplink modulated signal is from a locally generated is believed
Number carry out phase demodulation, obtain phase difference.
In the step S107, phase demodulation specifically can be carried out to two sinusoidal modulation signals using existing phase discriminator, obtain phase
Potential difference.
S108. the local distance to measuring distance of target equipment is calculated according to following formula:
In formula, Δ φ is phase difference, f0For the frequency of the sinusoidal modulation signal, Δ t is fixing process delay, and c is light
Speed.
In the step S108, Δ t is that the fixing process necessary to measuring distance of target equipment side and range unit side is prolonged
When, it can be measured in advance by routine experiment.It, can be based between receiving and transmitting signal from there through abovementioned steps S101~S108
The local distance to measuring distance of target equipment of measuring difference of phases, and in ranging process, due to be using interaction response mode into
Row ranging, it is possible to specify measuring distance of target equipment receives and feeds back modulated signal, so that ranging has specified property or directive property, and
Due to the adverse effect that sinusoidal modulation signal will not be interfered during transmitting-receiving with air quality, at final signal
Without the problems such as considering multipath reflection and multipath fading when reason, so that can substantially reduce in range unit side in data-handling capacity
The requirement of aspect, it is only necessary to which being handled by analog-modulated, demodulation, phase demodulation and simple operation can be obtained final distance measurement result, can benefit
In low-cost design hardware, it is particularly suitable for RFID of Internet-of-things positioning system.
After the step S108, in order to notify measuring distance of target equipment to obtain distance measurement result in time, on continuing
Pass the uplink modulated signal, optimization, further include following steps: S109. generates ranging end message, and on a second channel
Transmitting wirelessly the ranging end message, wherein the ranging end message includes the second measuring distance of target device address information,
The second measuring distance of target device address information is used to indicate the measuring distance of target equipment for needing to be immediately finished ranging response mode.Institute
Stating second channel can be channel identical with first channel, can also be different.Measuring distance of target equipment is receiving the survey
After end message, if it is determined that the second measuring distance of target device address information and local device address matching, then exit ranging
Response modes.It advanced optimizes, multiple measuring distance of target equipment is carried out if being started simultaneously by the ranging initiation message
Then there is the case where being completed at the same time multiple ranging tasks in ranging, in order to reduce the duration that measuring distance of target equipment listens to second channel,
Conducive to terminal device energy conservation, if therefore including measuring distance of target equipment group address message, institute in the ranging initiation message
Stating the second measuring distance of target device address information is measuring distance of target tables of equipment address contents or measuring distance of target device cluster address contents.This
Outside, sleep is listened to or is entered in order to indicate that the next step movement of measuring distance of target equipment is to continue with, advanced optimize, the survey
It also include to continue waiting for duration information or duration information of sleeping immediately away from end message, wherein long letter when continuing waiting for
Breath, which is used to indicate, needs measuring distance of target equipment to continue to listen to the duration of working channel, and the duration information of sleep immediately is used to indicate
Measuring distance of target equipment is needed to immediately enter the duration of sleep pattern.Measuring distance of target equipment after receiving the ranging end message,
Can continue to listen to working channel according to the duration information that continues waiting for, to complete other tasks, or according to it is described immediately
Sleep duration information timing dormancy, so as to energy conservation.It is described to continue waiting for duration information and the duration information of sleeping immediately is set
Mode is set not limit.
To sum up, it using phase shift rangefinder method provided by the present embodiment, has the following technical effect that
(1) a kind of novel phase shift rangefinder method is present embodiments provided, it can be based on the phase between receiving and transmitting signal
The local distance to measuring distance of target equipment of potential difference measurement, and in ranging process, due to being surveyed using interaction response mode
Modulated signal is received and feeds back away from, it is possible to specify measuring distance of target equipment, so that ranging has specified property or directive property, and due to
The adverse effect that sinusoidal modulation signal will not be interfered during transmitting-receiving with air quality, therefore in final signal processing
The problems such as without considering multipath reflection and multipath fading, so that can be substantially reduced in terms of data-handling capacity in range unit side
Requirement, it is only necessary to by analog-modulated, demodulation, phase demodulation and simple operation handle can be obtained final distance measurement result, can be conducive to low
Cost Design hardware is particularly suitable for RFID of Internet-of-things positioning system；
(2) the phase shift rangefinder method also have can multiple target simultaneously ranging, be conducive to measuring distance of target device energy conservation and
The advantages that flexible in application, is convenient for practical promotion and application.
Embodiment two
As shown in figure 4, a kind of range unit for realizing one the method for previous embodiment is present embodiments provided, including the
One carrier signal generation unit, sinusoidal modulation signal generation unit, the first analog-modulated unit, the first wireless transmit/receive units,
One analog demodulator unit, phase demodulation unit and first control unit；
The first carrier signal generation unit communicates to connect the first control unit, for single in first control
Under the control of member, descending carrier signal and up-link carrier signal are generated, wherein the descending carrier signal and the up-link carrier
The frequency of signal is respectively interposed between 300M~3GHz；
The sinusoidal modulation signal generation unit communicates to connect the first control unit, for single in first control
Under the control of member, sinusoidal modulation signal is generated, wherein the frequency of the sinusoidal modulation signal is between 10K~1MHz；
The first analog-modulated unit communicates to connect the first carrier signal generation unit and the sinusoidal tune respectively
Signal generation unit processed, for the sinusoidal modulation signal from the sinusoidal modulation signal generation unit and from described first
The descending carrier signal of carrier signal generation unit carries out analog-modulated, obtains downlink modulated signal；
First wireless transmit/receive units communicate to connect the first control unit and the first analog-modulated list respectively
Member, for being transmitted wirelessly on the first channel from the first control unit under the control of the first control unit
Ranging initiation message, and the downlink modulated signal from the first analog-modulated unit is transmitted wirelessly on the downlink channel,
And listen to up channel and uplink modulated signal of the wireless receiving from measuring distance of target equipment, wherein the ranging starting disappears
Breath includes the first measuring distance of target device address information, and the first measuring distance of target device address information is used to indicate needs immediately
Into the measuring distance of target equipment of ranging response mode, the uplink modulated signal is in measuring distance of target equipment side to from the downlink
The sinusoidal modulation signal demodulated in modulated signal and the up-link carrier signal of generation carry out modulating letter obtained from analog-modulated
Number；
The first analog demodulator unit communicates to connect the first carrier signal generation unit and first nothing respectively
Line Transmit-Receive Unit, for up-link carrier signal of the basis from the first carrier signal generation unit to from first nothing
The uplink modulated signal of line Transmit-Receive Unit is demodulated；
The phase demodulation unit communicates to connect the first analog demodulator unit respectively and the sinusoidal modulation signal generates list
Member, for sinusoidal modulation signal that is from the first analog demodulator unit and being demodulated from the uplink modulated signal
Phase demodulation is carried out with the sinusoidal modulation signal from the sinusoidal modulation signal generation unit, obtains phase difference；
The first control unit communicates to connect the phase demodulation unit, for generating the ranging initiation message, Yi Ji
After obtaining the phase difference from the phase demodulation unit, the local distance to measuring distance of target equipment is calculated according to following formula:
In formula, Δ φ is phase difference, f0For the frequency of the sinusoidal modulation signal, Δ t is fixing process delay, and c is light
Speed.
Optimization, the ranging initiation message also includes down channel unique identification and/or up channel unique identification.
Optimization, when the first measuring distance of target device address information indicates multiple measuring distance of target equipment, the ranging
Initiation message also includes and the one-to-one up channel unique identification of each measuring distance of target equipment.
Optimization, the ranging initiation message also includes ranging starting duration information, wherein the ranging starting duration
Information is used to indicate the maximum time that measuring distance of target equipment maintains ranging response mode.
Optimization, the ranging initiation message also include source address invalid bit and/or measuring distance of target equipment group address without
Imitate position, wherein the source address invalid bit, which is used to indicate in the ranging initiation message, is not present source address information, the survey
It is used to indicate away from target device group address invalid bit and measuring distance of target equipment group address letter is not present in the ranging initiation message
Breath, the source address information are used to indicate the identity of the sender of the ranging initiation message, measuring distance of target equipment group address
Information is used to indicate the group identity of measuring distance of target equipment.
Optimization, the first control unit is also used to after transmitting wirelessly the downlink modulated signal, if effectively ringing
The uplink modulated signal is not received in seasonable, then controls first wireless transmit/receive units and terminate the wireless transmission downlink
Modulated signal.
Optimization, the first control unit is also used to after the local distance to measuring distance of target equipment is calculated, raw
At ranging end message, and controls first wireless transmit/receive units and transmit wirelessly the ranging on a second channel and terminate to disappear
Breath, wherein the ranging end message includes the second measuring distance of target device address information, the second measuring distance of target equipment
Location information is used to indicate the measuring distance of target equipment for needing to be immediately finished ranging response mode.
It advanced optimizes, if in the ranging initiation message including measuring distance of target equipment group address message, institute
Stating the second measuring distance of target device address information is measuring distance of target tables of equipment address contents or measuring distance of target device cluster address contents.
It advanced optimizes, the ranging end message also includes long letter when continuing waiting for duration information or sleeping immediately
Breath, wherein described to continue waiting for duration information and be used to indicate that measuring distance of target equipment is needed to continue to listen to the duration of working channel, institute
It states sleep duration information immediately and is used to indicate the duration for needing measuring distance of target equipment to immediately enter sleep pattern.
The technical detail and technical effect of the present embodiment are consistent with the content of embodiment one, repeat no more in this.
Embodiment three
As shown in figure 5, present embodiments providing a kind of range-measurement system including range unit described in previous embodiment two, also
Including measuring distance of target equipment, wherein the measuring distance of target equipment includes the second wireless transmit/receive units, the second carrier signal generation list
Member, the second analog demodulator unit, the second analog-modulated unit and the second control unit；
Second wireless transmit/receive units communicate to connect second control unit, in second control unit
Under control, listens to the first channel and receive ranging initiation message and monitors downlink channel from the range unit and connect
The downlink modulated signal from the range unit is received, and wireless transmission comes from second analog-modulated on the uplink channel
The uplink modulated signal of unit；
The second carrier signal generation unit communicates to connect second control unit, for single in second control
Under the control of member, descending carrier signal and up-link carrier signal are generated, wherein the descending carrier signal and the up-link carrier
The frequency of signal is respectively interposed between 300M~3GHz；
The second analog demodulator unit communicates to connect second wireless transmit/receive units and second carrier wave letter respectively
Number generation unit, for according to the up-link carrier signal from the second carrier signal generation unit to coming from second nothing
The downlink modulated signal of line Transmit-Receive Unit is demodulated；
The second analog-modulated unit communicates to connect the second analog demodulator unit and second carrier wave letter respectively
Number generation unit, for sine that is from the second analog demodulator unit and being demodulated from the downlink modulated signal
Modulated signal and up-link carrier signal from the second carrier signal generation unit carry out analog-modulated, and it is modulated to obtain uplink
Signal；
Second control unit is used for after receiving the ranging initiation message from second wireless transmit/receive units, if
Determine the first measuring distance of target device address information in the ranging initiation message and local device address matching, then controls described the
Two wireless transmit/receive units and the second carrier signal generation unit enter ranging response mode.
The technical detail and technical effect of the present embodiment are consistent with the content of embodiment one, repeat no more in this.
The present invention is not limited to above-mentioned optional embodiment, anyone can show that other are each under the inspiration of the present invention
The product of kind form.Above-mentioned specific embodiment should not be understood the limitation of pairs of protection scope of the present invention, protection of the invention
Range should be subject to be defined in claims, and specification can be used for interpreting the claims.
Claims (10)
1. a kind of phase shift rangefinder method, which comprises the steps of:
S101. ranging initiation message is generated, wherein the ranging initiation message includes the first measuring distance of target device address letter
Breath, the first measuring distance of target device address information, which is used to indicate, to be needed to immediately enter the measuring distance of target of ranging response mode and sets
It is standby；
S102. the ranging initiation message is transmitted wirelessly on the first channel；
S103. sinusoidal modulation signal and descending carrier signal are generated, wherein the frequency of the sinusoidal modulation signal between 10K~
Between 1MHz, the frequency of the descending carrier signal is between 300M~3GHz；
S104. analog-modulated is carried out to the sinusoidal modulation signal and the descending carrier signal, obtains downlink modulated signal；
S105. the downlink modulated signal is transmitted wirelessly on the downlink channel；
S106. up channel, uplink modulated signal of the wireless receiving from measuring distance of target equipment, wherein the uplink is are listened to
Adjusting signal is in measuring distance of target equipment side to the upper of the sinusoidal modulation signal and generation demodulated from the downlink modulated signal
Row carrier signal carries out modulated signal obtained from analog-modulated, the frequency of the up-link carrier signal between 300M~3GHz it
Between；
S107. the sinusoidal modulation signal sinusoidal modulation signal demodulated from the uplink modulated signal being from a locally generated into
Row phase demodulation obtains phase difference；
S108. the local distance to measuring distance of target equipment is calculated according to following formula:
In formula, Δ φ is phase difference, f0For the frequency of the sinusoidal modulation signal, Δ t is fixing process delay, and c is the light velocity.
2. a kind of phase shift rangefinder method as described in claim 1, it is characterised in that:
The ranging initiation message also includes down channel unique identification and/or up channel unique identification.
3. a kind of phase shift rangefinder method as described in claim 1, it is characterised in that:
When the first measuring distance of target device address information indicates multiple measuring distance of target equipment, the ranging initiation message is also wrapped
Containing with the one-to-one up channel unique identification of each measuring distance of target equipment.
4. a kind of phase shift rangefinder method as described in claim 1, it is characterised in that:
The ranging initiation message also includes ranging starting duration information, wherein the ranging starting duration information is for referring to
Show that measuring distance of target equipment maintains the maximum time of ranging response mode.
5. a kind of phase shift rangefinder method as described in claim 1, it is characterised in that:
Further include following steps before the step S106:
S601. measuring distance of target equipment is after receiving the ranging initiation message, if it is determined that first measuring distance of target device address
Information and local device address matching then enter ranging response mode: executing subsequent step S602~S604；
S602. monitors downlink channel, and when wireless receiving is to the downlink modulated signal, it is solved from the downlink modulated signal
Recall sinusoidal modulation signal；
S603. to the sinusoidal modulation signal demodulated from the downlink modulated signal and the up-link carrier signal locally generated into
Row analog-modulated obtains uplink modulated signal；
S604. the uplink modulated signal is transmitted wirelessly on the uplink channel.
6. a kind of phase shift rangefinder method as claimed in claim 5, it is characterised in that:
Further include following steps before the step S601:
S600. for measuring distance of target equipment after receiving specified wakeup message, the first channel is listened in starting, wherein described specify is called out
Awake message package contains and the matched specified wake-up device address information in measuring distance of target device address.
7. a kind of phase shift rangefinder method as described in claim 1, it is characterised in that:
After the step S105, if not receiving the uplink modulated signal within the significant response time, wireless hair is terminated
Send the downlink modulated signal.
8. a kind of phase shift rangefinder method as described in claim 1, it is characterised in that:
Further include following steps after the step S108:
S109. ranging end message is generated, and transmits wirelessly the ranging end message on a second channel, wherein the survey
It include the second measuring distance of target device address information away from end message, the second measuring distance of target device address information is used to indicate
Need to be immediately finished the measuring distance of target equipment of ranging response mode.
9. a kind of phase shift rangefinder method as claimed in claim 8, it is characterised in that:
If in the ranging initiation message including measuring distance of target equipment group address message, the second measuring distance of target equipment
Address information is measuring distance of target tables of equipment address contents or measuring distance of target device cluster address contents.
10. a kind of phase shift rangefinder method as claimed in claim 8, it is characterised in that:
The ranging end message also includes to continue waiting for duration information or duration information of sleeping immediately, wherein the continuation
Waiting time information, which is used to indicate, needs measuring distance of target equipment to continue to listen to the duration of working channel, long letter when sleeping immediately
Breath is used to indicate the duration for needing measuring distance of target equipment to immediately enter sleep pattern.
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