CN110007297B - Method and device for measuring distance between transmitter and receiver - Google Patents

Method and device for measuring distance between transmitter and receiver Download PDF

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CN110007297B
CN110007297B CN201910204519.4A CN201910204519A CN110007297B CN 110007297 B CN110007297 B CN 110007297B CN 201910204519 A CN201910204519 A CN 201910204519A CN 110007297 B CN110007297 B CN 110007297B
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gain control
temperature
rssi
value
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CN110007297A (en
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杨辉
米杨
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Beijing Star Net Ruijie Networks Co Ltd
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Beijing Star Net Ruijie Networks Co Ltd
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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
    • G01S11/06—Systems for determining distance or velocity not using reflection or reradiation using radio waves using intensity measurements

Abstract

The invention provides a method and a device for measuring the distance between a transmitter and a receiver, wherein the method comprises the following steps: setting n temperature acquisition points, wherein the temperature of each temperature acquisition point is within a preset temperature range; at each temperature acquisition point, continuously transmitting radio frequency signals for t times by using a reference source, and acquiring a signal strength RSSI (received signal strength indicator) of the receiver and a real-time transmission gain control value of a transmitter, wherein the transmission power of the transmitter is stable and the radio frequency power output to the receiver by the reference source is stable; establishing a corresponding model between the signal strength RSSI and the real-time transmission gain control value according to the signal strength RSSI and the real-time transmission gain control value acquired t times at each temperature acquisition point; determining a temperature deviation compensation value according to the corresponding model; determining a distance between the transmitter and the receiver according to the temperature deviation compensation value. The beneficial effects are that, do not need extra temperature sensor, the scheme is with low costs.

Description

Method and device for measuring distance between transmitter and receiver
Technical Field
The present invention relates to the field of data communication, and in particular, to a method and apparatus for measuring a distance between a transmitter and a receiver.
Background
The Received Signal Strength Indication (RSSI) is an average Signal Strength Indication of the receiver input obtained by a receiver measurement circuit in a radio frequency communication system. The received signal strength indication is an optional part of the radio transmission layer and is used to determine the link quality of the transceiver system. The relationship between the transmit power and the receive power of a wireless signal can be expressed as: r (dbm) ═ a-10nlgr, R is the received signal strength indicator value, a is the received signal power at 1m distance of signal transmission, R is the distance between the transceiver units, and n is the propagation factor. The distance between the transmitter and the receiver can be estimated by obtaining the received signal strength indication value.
Changes in the ambient temperature can affect the propagation characteristics of the rf transceiver link, the electrical parameters of the rf transceiver, and so on. Thereby causing variation in RSSI characteristics and making the result of distance calculation between the transceiver units inaccurate. For the accuracy of the distance calculation result between the transmitter and the receiver, the temperature characteristic of the RSSI needs to be compensated.
The prior art compensates the temperature characteristic of the received signal strength indication of the receiver, and the main solutions at present are as follows:
one, direct measurement ambient temperature compensation
The method includes the steps of directly measuring the ambient temperature, selecting a temperature compensation coefficient from prestored temperature compensation coefficients corresponding to the normal temperature, the low temperature and the high temperature according to the current temperature, and performing temperature compensation on a Received Signal Strength Indication (RSSI) output signal according to the selected temperature compensation coefficient, so that the power of an RSSI input signal is obtained.
Second, compensation is carried out by optimizing circuit design
The circuit scheme and circuit parameters are optimized to improve the stability of the received signal strength measurements to temperature variations.
The prior art has problems in that the compensation method of directly measuring the ambient temperature is not effective and has a hysteresis effect due to uncertainty of the temperature field distribution and time delay of heat conduction. The compensation effect of the compensation method for optimizing the circuit design still has a space for improvement.
Disclosure of Invention
In order to solve the technical problem, the embodiment of the invention adopts the following technical scheme:
a method of measuring a distance between a transmitter and a receiver for use in a radio frequency communication unit having a receiver and a transmitter, comprising:
setting n temperature collection points, wherein n is a natural number greater than or equal to 2, and the temperature of each temperature collection point is within a preset temperature range;
at each temperature acquisition point, continuously transmitting radio frequency signals for t times by using a reference source, and acquiring a signal strength RSSI (received signal strength indicator) of the receiver and a real-time transmission gain control value of a transmitter, wherein the transmission power of the transmitter is stable, the radio frequency power output to the receiver by the reference source is stable, and t is a natural number greater than or equal to 2;
establishing a corresponding model between the signal strength RSSI and the real-time transmission gain control value according to the signal strength RSSI and the real-time transmission gain control value acquired t times at each temperature acquisition point;
determining a temperature deviation compensation value according to the corresponding model;
determining a distance between the transmitter and the receiver according to the temperature deviation compensation value.
Optionally, before the step of establishing a corresponding model between the RSSI and the real-time transmission gain control value according to the RSSI and the real-time transmission gain control value acquired t times at each temperature acquisition point, the method further includes:
averaging the RSSI of the receiver acquired t times at each temperature acquisition point;
averaging the real-time transmission gain control values of the transmitter acquired t times at each temperature acquisition point;
the step of establishing a corresponding model between the signal strength RSSI and the real-time transmission gain control value according to the signal strength RSSI and the real-time transmission gain control value acquired t times at each temperature acquisition point specifically comprises the following steps:
and establishing a corresponding model between the signal strength RSSI and the real-time transmission gain control value according to the average value of the signal strength RSSI and the average value of the real-time transmission gain control value acquired for t times at each temperature acquisition point.
Optionally, the step of averaging the RSSI of the receiver acquired t times at each temperature acquisition point specifically includes:
the RSSI of the receiver acquired t times at each temperature acquisition point is averaged by equation (1):
Figure BDA0001998542510000031
wherein i is 1,2, …, n; j ═ 1,2, …, t; ri,jThe RSSI of the receiver collected for the j time at the ith temperature collection point;
the step of averaging the real-time transmission gain control values of the transmitter acquired t times at each temperature acquisition point specifically comprises:
averaging the real-time transmit gain control values of the transmitter acquired t times at each temperature acquisition point by equation (2):
Figure BDA0001998542510000032
wherein i is 1,2, …, n; j ═ 1,2, …, t; t isi,jThe real-time emission gain control value of the emitter acquired at the jth temperature acquisition point is acquired;
the step of establishing a corresponding model between the signal strength RSSI and the real-time transmission gain control value according to the average value of the signal strength RSSI and the average value of the real-time transmission gain control value acquired t times at each temperature acquisition point specifically comprises the following steps:
establishing a corresponding model (3) between the signal strength RSSI and the real-time transmission gain control value according to the average value of the signal strength RSSI and the average value of the real-time transmission gain control value acquired for t times at each temperature acquisition point:
Figure BDA0001998542510000033
wherein s is a non-zero natural number; k is 1,2, …, s; a iskTo fit polynomial coefficients, Tk-1To the fitting polynomial (k-1 power of T).
Optionally, the step of determining the temperature deviation compensation value according to the corresponding model specifically includes:
fitting the corresponding model to obtain a monotonous relation curve formula (4) of the mean value of the RSSI along with the mean value change of the real-time transmission gain control value;
Figure BDA0001998542510000041
wherein the content of the first and second substances,
Figure BDA0001998542510000042
to be an estimate of the rf unit receiver RSSI to be compensated,
Figure BDA0001998542510000043
for the purpose of the coefficient estimation values,
and carrying out regression coefficient significance test on the monotonic relation curve to obtain an optimal model formula (5) fitted by the corresponding model:
Figure BDA0001998542510000044
wherein { m } - {1,2, …, s } - { l };
Figure BDA0001998542510000045
the estimated value of the RSSI of the radio frequency unit receiver to be compensated after the significance test;
Figure BDA0001998542510000046
a coefficient estimate retained after significance testing; t ism-1Multiple entries retained after significance testing; and l is a culled irrelevant or extremely weakly relevant multiple term subscript.
Substituting the optimal model into a formula (6) to obtain a temperature deviation compensation value:
Figure BDA0001998542510000047
wherein R isrefThe receiver receives the RSSI value output by the reference source for a particular constant temperature.
Delta R is a temperature deviation compensation value; g (T) indicates that the temperature offset compensation value is a function of the real-time transmit gain control value T;
optionally, the step of determining the distance between the transmitter and the receiver according to the temperature deviation compensation value specifically includes:
obtaining the current measured real-time emission gain control value, substituting the current measured real-time emission gain control value into a formula (6) to calculate the current temperature deviation compensation value delta Rreal；
Obtaining the RSSI value R of the current measurementrealThe currently measured RSSI value R is usedrealSubtracting the current temperature deviation compensation value DeltaRrealObtaining a temperature compensation result value;
substituting the temperature compensation result value into a relation formula (7) between the transmitting power and the receiving power of the wireless signal to calculate the distance r between the transmitter and the receiver;
Rreal-ΔRreal＝A-10nlgr (7)，
wherein A is the theoretical power of the received signal when the reference source establishes the transmitting power signal transmission distance of 1 meter, and n is the propagation factor.
The embodiment of the invention also provides a device for measuring the distance between a transmitter and a receiver, which is applied to a radio frequency communication unit with the receiver and the transmitter, and comprises the following components:
the device comprises a setting module, a temperature acquisition module and a control module, wherein the setting module is used for setting n temperature acquisition points, n is a natural number which is more than or equal to 2, and the temperature of each temperature acquisition point is within a preset temperature range;
the acquisition module is used for transmitting radio frequency signals by using a reference source for t times continuously at each temperature acquisition point, and acquiring the signal strength RSSI of the receiver and the real-time transmission gain control value of the transmitter, wherein the transmission power of the transmitter is stable, the radio frequency power output to the receiver by the reference source is stable, and t is a natural number greater than or equal to 2;
the establishing module is used for establishing a corresponding model between the signal strength RSSI and the real-time transmission gain control value according to the signal strength RSSI and the real-time transmission gain control value acquired t times at each temperature acquisition point;
the determining module is used for determining a temperature deviation compensation value according to the corresponding model;
and the distance measurement module is used for determining the distance between the transmitter and the receiver according to the temperature deviation compensation value.
Optionally, the apparatus further comprises:
the first calculation module is used for averaging the RSSI of the receiver acquired t times at each temperature acquisition point;
the second calculation module is used for averaging the real-time emission gain control values of the emitter acquired t times at each temperature acquisition point;
the establishing module is specifically configured to:
and establishing a corresponding model between the signal strength RSSI and the real-time transmission gain control value according to the average value of the signal strength RSSI and the average value of the real-time transmission gain control value acquired for t times at each temperature acquisition point.
Optionally, the first calculating module is specifically configured to:
the RSSI of the receiver acquired t times at each temperature acquisition point is averaged by equation (1):
Figure BDA0001998542510000061
wherein i is 1,2, …, n; j ═ 1,2, …, t; ri,jThe RSSI of the receiver collected for the j time at the ith temperature collection point;
the second calculation module is specifically configured to:
averaging the real-time transmit gain control values of the transmitter acquired t times at each temperature acquisition point by equation (2):
Figure BDA0001998542510000062
wherein i is 1,2, …, n; j ═ 1,2, …, t; t isi,jThe real-time emission gain control value of the emitter acquired at the jth temperature acquisition point is acquired;
the establishing module is specifically configured to:
establishing a corresponding model (3) between the signal strength RSSI and the real-time transmission gain control value according to the average value of the signal strength RSSI and the average value of the real-time transmission gain control value acquired for t times at each temperature acquisition point:
Figure BDA0001998542510000063
wherein s is a non-zero natural number; k is 1,2, …, s; a iskTo fit polynomial coefficients, Tk -1Is a fitting polynomial.
Optionally, the determining module is specifically configured to:
fitting the corresponding model to obtain a monotonous relation curve formula (4) of the mean value of the RSSI along with the mean value change of the real-time transmission gain control value;
Figure BDA0001998542510000064
wherein the content of the first and second substances,
Figure BDA0001998542510000065
to be an estimate of the rf unit receiver RSSI to be compensated,
Figure BDA0001998542510000066
for the purpose of the coefficient estimation values,
and carrying out regression coefficient significance test on the monotonic relation curve to obtain an optimal model formula (5) fitted by the corresponding model:
Figure BDA0001998542510000071
wherein { m } - {1,2, …, s } - { l };
Figure BDA0001998542510000072
the estimated value of the RSSI of the radio frequency unit receiver to be compensated after the significance test;
Figure BDA0001998542510000073
a coefficient estimate retained after significance testing; t ism-1Multiple entries retained after significance testing; and l is a culled irrelevant or extremely weakly relevant multiple term subscript.
Substituting the optimal model into a formula (6) to obtain a temperature deviation compensation value:
Figure BDA0001998542510000074
wherein, the receiver receives the RSSI value output by the reference source under a specific constant temperature.
Delta R is a temperature deviation compensation value; g (T) indicates that the temperature offset compensation value is a function of the real-time transmit gain control value T;
optionally, the ranging module is specifically configured to:
obtaining the current measured real-time emission gain control value, substituting the current measured real-time emission gain control value into a formula (6) to calculate the current temperature deviation compensation value delta Rreal；
Obtaining the RSSI value R of the current measurementrealThe currently measured RSSI value R is usedrealSubtracting the current temperature deviation compensation value DeltaRrealObtaining a temperature compensation result value;
substituting the temperature compensation result value into a relation formula (7) between the transmitting power and the receiving power of the wireless signal to calculate the distance r between the transmitter and the receiver;
Rreal-ΔRreal＝A-10nlgr (7)，
wherein A is the theoretical power of the received signal when the reference source establishes the transmitting power signal transmission distance of 1 meter, and n is the propagation factor.
The embodiment of the invention has the beneficial effect of making up the defects of accuracy problem and hysteresis effect caused by uncertainty of temperature field distribution and time delay of heat conduction in the direct measurement environment temperature compensation method in the prior art. The existing parameters of the radio frequency unit to be compensated are used for compensation, a temperature sensor is not required to be additionally arranged, and the scheme cost is low.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a method provided by an embodiment of the present invention;
FIG. 2 is a flow chart of a method provided by an embodiment of the present invention;
fig. 3 is a diagram illustrating a structure of an apparatus according to an embodiment of the present invention.
Fig. 4 is a diagram illustrating a structure of an apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides a method for measuring a distance between a transmitter and a receiver, which is applied to a radio frequency communication unit having a receiver and a transmitter, as shown in fig. 1, and includes:
s101, setting n temperature collection points, wherein n is a natural number greater than or equal to 2, and the temperature of each temperature collection point is within a preset temperature range;
s103, at each temperature acquisition point, continuously transmitting radio frequency signals for t times by using a reference source, and acquiring a signal strength RSSI (received signal strength indicator) of the receiver and a real-time transmission gain control value of a transmitter, wherein the transmission power of the transmitter is stable, the radio frequency power output to the receiver by the reference source is stable, and t is a natural number greater than or equal to 2;
s105, establishing a corresponding model between the RSSI and the real-time transmission gain control value according to the RSSI and the real-time transmission gain control value acquired t times at each temperature acquisition point;
s107, determining a temperature deviation compensation value according to the corresponding model;
and S109, determining the distance between the transmitter and the receiver according to the temperature deviation compensation value.
Optionally, in an embodiment of the present invention, before step S103, as shown in fig. 2, the method further includes:
s1031, averaging RSSI of the receiver acquired t times at each temperature acquisition point;
s1033, averaging the real-time emission gain control values of the emitter acquired t times at each temperature acquisition point;
correspondingly, the step S105 specifically includes:
and establishing a corresponding model between the signal strength RSSI and the real-time transmission gain control value according to the average value of the signal strength RSSI and the average value of the real-time transmission gain control value acquired for t times at each temperature acquisition point.
Optionally, in an embodiment of the present invention, the step S1031 specifically includes:
the RSSI of the receiver acquired t times at each temperature acquisition point is averaged by equation (1):
Figure BDA0001998542510000091
wherein i is 1,2, …, n; j ═ 1,2, …, t; ri,jThe RSSI of the receiver collected for the j time at the ith temperature collection point;
step S1033 is specifically:
averaging the real-time transmit gain control values of the transmitter acquired t times at each temperature acquisition point by equation (2):
Figure BDA0001998542510000092
wherein i is 1,2, …, n; j ═ 1,2, …, t; t isi,jThe real-time emission gain control value of the emitter acquired at the jth temperature acquisition point is acquired;
the step S105 specifically includes:
establishing a corresponding model (3) between the signal strength RSSI and the real-time transmission gain control value according to the average value of the signal strength RSSI and the average value of the real-time transmission gain control value acquired for t times at each temperature acquisition point:
Figure BDA0001998542510000101
wherein s is a non-zero natural number; k is 1,2, …, s; a iskTo fit toPolynomial coefficient, Tk-1To the fitting polynomial (k-1 power of T).
Optionally, in an embodiment of the present invention, the step S107 specifically includes:
fitting the corresponding model to obtain a monotonous relation curve formula (4) of the mean value of the RSSI along with the mean value change of the real-time transmission gain control value;
Figure BDA0001998542510000102
wherein the content of the first and second substances,
Figure BDA0001998542510000103
to be an estimate of the rf unit receiver RSSI to be compensated,
Figure BDA0001998542510000104
for fitting the polynomial coefficient estimation values, optionally, the corresponding models may be fitted according to the least square principle (the basic method of regression analysis in probability statistics, i.e., selecting fitting coefficients according to the principle that the sum of squares of errors between the observed values and the fitting estimation values is minimum).
Performing a regression coefficient significance test on the monotonic relation curve (which is a basic method of regression coefficient test in probability statistics, namely, constructing a test hypothesis, a statistic, and a test level and then judging whether to reject or accept the test hypothesis), to obtain the optimal model formula (5) fitted by the corresponding model, wherein the specific way to obtain the optimal model formula (5) fitted by the corresponding model may be: selecting finite value s, and eliminating multiple items which are irrelevant or extremely weak relevant (the selection of the inspection level value in the regression coefficient significance inspection represents the size of the relevance, and the inspection level value is generally selected to be 0.05)
Figure BDA0001998542510000105
Wherein the content of the first and second substances,
Figure BDA00019985425100001010
then equation (5) can be obtained:
Figure BDA0001998542510000106
wherein { m } - {1,2, …, s } - { l };
Figure BDA0001998542510000107
the estimated value of the RSSI of the radio frequency unit receiver to be compensated after the significance test;
Figure BDA0001998542510000108
a coefficient estimate retained after significance testing; t ism-1Multiple entries retained after significance testing; and l is a culled irrelevant or extremely weakly relevant multiple term subscript.
Substituting the optimal model into a formula (6) to obtain a temperature deviation compensation value:
Figure BDA0001998542510000109
wherein R isrefIn order for the receiver to receive the RSSI value of the reference source output at a certain constant temperature, the certain constant temperature may be 20 degrees.
Delta R is a temperature deviation compensation value; g (T) indicates that the temperature offset compensation value is a function of the real-time transmit gain control value T;
optionally, in an embodiment of the present invention, the step S109 specifically includes:
obtaining a currently measured real-time transmit gain control value TrealThe currently measured real-time transmission gain control value T is usedrealSubstituting formula (6) to calculate the current temperature deviation compensation value delta Rreal；
Obtaining the RSSI value R of the current measurementrealThe currently measured RSSI value R is usedrealSubtracting the current temperature deviation compensation value DeltaRrealObtaining a temperature compensation result value;
substituting the temperature compensation result value into a relation formula (7) between the transmitting power and the receiving power of the wireless signal to calculate the distance r between the transmitter and the receiver;
Rreal-ΔRreal＝A-10nlgr (7)，
wherein A is the theoretical power of the received signal when the reference source establishes the transmitting power signal transmission distance of 1 meter, and n is the propagation factor.
The embodiment of the invention has the beneficial effect of making up the defects of accuracy problem and hysteresis effect caused by uncertainty of temperature field distribution and time delay of heat conduction in the direct measurement environment temperature compensation method in the prior art. The existing parameters of the radio frequency unit to be compensated are used for compensation, a temperature sensor is not required to be additionally arranged, and the scheme cost is low.
An embodiment of the present invention further provides an apparatus for measuring a distance between a transmitter and a receiver, which is applied to a radio frequency communication unit having a receiver and a transmitter, as shown in fig. 3, and includes:
the setting module 301 is configured to set n temperature collection points, where n is a natural number greater than or equal to 2, and the temperature of each temperature collection point is within a preset temperature range;
an acquisition module 303, configured to transmit a radio frequency signal using a reference source for t consecutive times at each temperature acquisition point, and acquire a signal strength RSSI of the receiver and a real-time transmission gain control value of a transmitter, where transmission power of the transmitter is stable and radio frequency power output from the reference source to the receiver is stable, and t is a natural number greater than or equal to 2;
an establishing module 305, configured to establish a corresponding model between the RSSI and the real-time transmission gain control value according to the RSSI and the real-time transmission gain control value acquired t times at each temperature acquisition point;
a determining module 307, configured to determine a temperature deviation compensation value according to the corresponding model;
a ranging module 309, configured to determine a distance between the transmitter and the receiver according to the temperature deviation compensation value.
Optionally, in an embodiment of the present invention, as shown in fig. 4, the apparatus further includes:
a first calculating module 401, configured to average RSSI of the receiver acquired t times at each temperature acquisition point;
a second calculating module 403, configured to average the real-time transmission gain control values of the transmitter acquired t times at each temperature acquisition point;
the establishing module 305 is specifically configured to:
and establishing a corresponding model between the signal strength RSSI and the real-time transmission gain control value according to the average value of the signal strength RSSI and the average value of the real-time transmission gain control value acquired for t times at each temperature acquisition point.
Optionally, in an embodiment of the present invention, the first calculating module 401 is specifically configured to:
the RSSI of the receiver acquired t times at each temperature acquisition point is averaged by equation (1):
Figure BDA0001998542510000121
wherein i is 1,2, …, n; j ═ 1,2, …, t; ri,jThe RSSI of the receiver collected for the j time at the ith temperature collection point;
the second calculating module 403 is specifically configured to:
averaging the real-time transmit gain control values of the transmitter acquired t times at each temperature acquisition point by equation (2):
Figure BDA0001998542510000122
wherein i is 1,2, …, n; j ═ 1,2, …, t; t isi,jThe real-time emission gain control value of the emitter acquired at the jth temperature acquisition point is acquired;
the establishing module 305 is specifically configured to:
establishing a corresponding model (3) between the signal strength RSSI and the real-time transmission gain control value according to the average value of the signal strength RSSI and the average value of the real-time transmission gain control value acquired for t times at each temperature acquisition point:
Figure BDA0001998542510000131
wherein s is a non-zero natural number; k is 1,2, …, s; a iskTo fit polynomial coefficients, Tk-1To the fitting polynomial (k-1 power of T).
Optionally, the determining module 307 is specifically configured to:
fitting the corresponding model to obtain a monotonous relation curve formula (4) of the mean value of the RSSI along with the mean value change of the real-time transmission gain control value;
Figure BDA0001998542510000132
wherein the content of the first and second substances,
Figure BDA0001998542510000133
to be an estimate of the rf unit receiver RSSI to be compensated,
Figure BDA0001998542510000134
for coefficient estimation, optionally, the corresponding model may be fitted according to the least square principle (the basic method of regression analysis in probability statistics, that is, the fitting coefficient is selected according to the principle that the sum of the squares of the errors between the observed values and the fitting estimation values is the minimum).
Performing a regression coefficient significance test on the monotonic relation curve (which is a basic method of regression coefficient test in probability statistics, namely, constructing a test hypothesis, a statistic, and a test level and then judging whether to reject or accept the test hypothesis), and obtaining the optimal model formula (5) of the corresponding model fitting, wherein a specific way of obtaining the optimal model formula (5) of the corresponding model fitting may be: selecting finite value s, and eliminating multiple items which are irrelevant or extremely weak relevant (the selection of the inspection level value in the regression coefficient significance inspection represents the size of the relevance, and the inspection level value is generally selected to be 0.05)
Figure BDA0001998542510000135
Wherein the content of the first and second substances,
Figure BDA0001998542510000139
then equation (5) can be obtained:
Figure BDA0001998542510000136
wherein { m } - {1,2, …, s } - { l };
Figure BDA0001998542510000137
the estimated value of the RSSI of the radio frequency unit receiver to be compensated after the significance test;
Figure BDA0001998542510000138
a coefficient estimate retained after significance testing; t ism-1Multiple entries retained after significance testing; and l is a culled irrelevant or extremely weakly relevant multiple term subscript.
Substituting the optimal model into a formula (6) to obtain a temperature deviation compensation value:
Figure BDA0001998542510000141
wherein R isrefIn order for the receiver to receive the RSSI value of the reference source output at a certain constant temperature, the certain constant temperature may be 20 degrees.
Delta R is a temperature deviation compensation value; g (T) indicates that the temperature offset compensation value is a function of the real-time transmit gain control value T;
optionally, in an embodiment of the present invention, the ranging module 309 is specifically configured to:
obtaining a currently measured real-time transmit gain control value TrealThe currently measured real-time transmission gain control value T is usedreaSubstituting formula (6) to calculate the current temperature deviation compensation value delta Rreal；
Obtaining the RSSI value R of the current measurementrealThe currently measured RSSI value R is usedrealSubtracting the current temperature deviation compensation value DeltaRrealObtaining a temperature compensation result value;
substituting the temperature compensation result value into a relation formula (7) between the transmitting power and the receiving power of the wireless signal to calculate the distance r between the transmitter and the receiver;
Rreal-ΔRreal＝A-10nlgr (7)，
wherein A is the theoretical power of the received signal when the reference source establishes the transmitting power signal transmission distance of 1 meter, and n is the propagation factor.
The embodiment of the invention has the beneficial effect of making up the defects of accuracy problem and hysteresis effect caused by uncertainty of temperature field distribution and time delay of heat conduction in the direct measurement environment temperature compensation method in the prior art. The existing parameters of the radio frequency unit to be compensated are used for compensation, a temperature sensor is not required to be additionally arranged, and the scheme cost is low.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (4)

1. A method of measuring a distance between a transmitter and a receiver, for use in a radio frequency communication unit having a receiver and a transmitter, comprising:
setting n temperature collection points, wherein n is a natural number greater than or equal to 2, and the temperature of each temperature collection point is within a preset temperature range;
at each temperature acquisition point, continuously transmitting radio frequency signals for t times by using a reference source, and acquiring a signal strength RSSI (received signal strength indicator) of the receiver and a real-time transmission gain control value of a transmitter, wherein the transmission power of the transmitter is stable, the radio frequency power output to the receiver by the reference source is stable, and t is a natural number greater than or equal to 2;
establishing a corresponding model between the signal strength RSSI and the real-time transmission gain control value according to the signal strength RSSI and the real-time transmission gain control value acquired t times at each temperature acquisition point;
determining a temperature deviation compensation value according to the corresponding model;
determining a distance between the transmitter and the receiver according to the temperature deviation compensation value; before the step of establishing a corresponding model between the RSSI and the real-time transmission gain control value according to the RSSI and the real-time transmission gain control value acquired t times at each temperature acquisition point, the method further comprises:
averaging the RSSI of the receiver acquired t times at each temperature acquisition point;
averaging the real-time transmission gain control values of the transmitter acquired t times at each temperature acquisition point;
the step of establishing a corresponding model between the signal strength RSSI and the real-time transmission gain control value according to the signal strength RSSI and the real-time transmission gain control value acquired t times at each temperature acquisition point specifically comprises the following steps:
establishing a corresponding model between the signal strength RSSI and the real-time transmission gain control value according to the average value of the signal strength RSSI and the average value of the real-time transmission gain control value acquired t times at each temperature acquisition point; the step of averaging the RSSI of the receiver acquired t times at each temperature acquisition point specifically comprises:
the RSSI of the receiver acquired t times at each temperature acquisition point is averaged by equation (1):
Figure FDA0002777432320000021
wherein i is 1,2, …, n; j ═ 1,2, …, t; ri,jThe RSSI of the receiver collected for the j time at the ith temperature collection point;
the step of averaging the real-time transmission gain control values of the transmitter acquired t times at each temperature acquisition point specifically comprises:
averaging the real-time transmit gain control values of the transmitter acquired t times at each temperature acquisition point by equation (2):
Figure FDA0002777432320000022
wherein i is 1,2, …, n; j ═ 1,2, …, t; t isi,jThe real-time emission gain control value of the emitter acquired at the jth temperature acquisition point is acquired;
the step of establishing a corresponding model between the signal strength RSSI and the real-time transmission gain control value according to the average value of the signal strength RSSI and the average value of the real-time transmission gain control value acquired t times at each temperature acquisition point specifically comprises the following steps:
establishing a corresponding model (3) between the signal strength RSSI and the real-time transmission gain control value according to the average value of the signal strength RSSI and the average value of the real-time transmission gain control value acquired for t times at each temperature acquisition point:
Figure FDA0002777432320000023
wherein s is a non-zero natural number; k is 1,2, …, s; a iskTo fit polynomial coefficients, Tk-1Is a fitting polynomial; the step of determining a temperature deviation compensation value according to the corresponding model specifically includes:
fitting the corresponding model to obtain a monotonous relation curve formula (4) of the mean value of the RSSI along with the mean value change of the real-time transmission gain control value;
Figure FDA0002777432320000024
wherein the content of the first and second substances,
Figure FDA0002777432320000025
to be an estimate of the rf unit receiver RSSI to be compensated,
Figure FDA0002777432320000026
for the purpose of the coefficient estimation values,
and carrying out regression coefficient significance test on the monotonic relation curve to obtain an optimal model formula (5) fitted by the corresponding model:
Figure FDA0002777432320000031
wherein { m } - {1,2, …, s } - { l };
Figure FDA0002777432320000032
the estimated value of the RSSI of the radio frequency unit receiver to be compensated after the significance test;
Figure FDA0002777432320000033
a coefficient estimate retained after significance testing; t ism-1Multiple entries retained after significance testing; l is a plurality of item subscripts which are irrelevant or extremely weak to be eliminated;
substituting the optimal model into a formula (6) to obtain a temperature deviation compensation value:
Figure FDA0002777432320000034
wherein R isrefReceiving the RSSI value output by the reference source for the receiver at a specific constant temperature;
delta R is a temperature deviation compensation value; g (T) indicates that the temperature offset compensation value is a function of the real-time transmit gain control value T.
2. The method according to claim 1, wherein the step of determining the distance between the transmitter and the receiver from the temperature deviation compensation value comprises in particular:
obtaining the current measured real-time emission gain control value, substituting the current measured real-time emission gain control value into a formula (6) to calculate the current temperature deviation compensation value delta Rreal；
Obtaining the RSSI value R of the current measurementrealThe currently measured RSSI value R is usedrealSubtracting the current temperature deviation compensation value DeltaRrealObtaining a temperature compensation result value;
substituting the temperature compensation result value into a relation formula (7) between the transmitting power and the receiving power of the wireless signal to calculate the distance r between the transmitter and the receiver;
Rreal-ΔRreal＝A-10n lg r (7)，
wherein A is the theoretical power of the received signal when the reference source establishes the transmitting power signal transmission distance of 1 meter, and n is the propagation factor.
3. An apparatus for measuring a distance between a transmitter and a receiver, for use in a radio frequency communication unit having a receiver and a transmitter, comprising:
the device comprises a setting module, a temperature acquisition module and a control module, wherein the setting module is used for setting n temperature acquisition points, n is a natural number which is more than or equal to 2, and the temperature of each temperature acquisition point is within a preset temperature range;
the acquisition module is used for transmitting radio frequency signals by using a reference source for t times continuously at each temperature acquisition point, and acquiring the signal strength RSSI of the receiver and the real-time transmission gain control value of the transmitter, wherein the transmission power of the transmitter is stable, the radio frequency power output to the receiver by the reference source is stable, and t is a natural number greater than or equal to 2;
the establishing module is used for establishing a corresponding model between the signal strength RSSI and the real-time transmission gain control value according to the signal strength RSSI and the real-time transmission gain control value acquired t times at each temperature acquisition point;
the determining module is used for determining a temperature deviation compensation value according to the corresponding model;
the distance measurement module is used for determining the distance between the transmitter and the receiver according to the temperature deviation compensation value; the device further comprises:
the first calculation module is used for averaging the RSSI of the receiver acquired t times at each temperature acquisition point;
the second calculation module is used for averaging the real-time emission gain control values of the emitter acquired t times at each temperature acquisition point;
the establishing module is specifically configured to:
establishing a corresponding model between the signal strength RSSI and the real-time transmission gain control value according to the average value of the signal strength RSSI and the average value of the real-time transmission gain control value acquired t times at each temperature acquisition point; the first calculation module is specifically configured to:
the RSSI of the receiver acquired t times at each temperature acquisition point is averaged by equation (1):
Figure FDA0002777432320000041
wherein i is 1,2, …, n; j ═ 1,2, …, t; ri,jThe RSSI of the receiver collected for the j time at the ith temperature collection point;
the second calculation module is specifically configured to:
averaging the real-time transmit gain control values of the transmitter acquired t times at each temperature acquisition point by equation (2):
Figure FDA0002777432320000051
wherein i is 1,2, …, n; j ═ 1,2, …, t; t isi,jThe real-time emission gain control value of the emitter acquired at the jth temperature acquisition point is acquired;
the establishing module is specifically configured to:
establishing a corresponding model (3) between the signal strength RSSI and the real-time transmission gain control value according to the average value of the signal strength RSSI and the average value of the real-time transmission gain control value acquired for t times at each temperature acquisition point:
Figure FDA0002777432320000052
wherein s is a non-zero natural number; k is 1,2, …, s; a iskTo fit polynomial coefficients, Tk-1Is a fitting polynomial; the determining module is specifically configured to:
fitting the corresponding model to obtain a monotonous relation curve formula (4) of the mean value of the RSSI along with the mean value change of the real-time transmission gain control value;
Figure FDA0002777432320000053
wherein the content of the first and second substances,
Figure FDA0002777432320000054
to be an estimate of the rf unit receiver RSSI to be compensated,
Figure FDA0002777432320000055
for the purpose of the coefficient estimation values,
and carrying out regression coefficient significance test on the monotonic relation curve to obtain an optimal model formula (5) fitted by the corresponding model:
Figure FDA0002777432320000056
wherein { m } - {1,2, …, s } - { l };
Figure FDA0002777432320000057
the estimated value of the RSSI of the radio frequency unit receiver to be compensated after the significance test;
Figure FDA0002777432320000058
a coefficient estimate retained after significance testing; t ism-1Multiple entries retained after significance testing; l is a plurality of item subscripts which are irrelevant or extremely weak to be eliminated;
substituting the optimal model into a formula (6) to obtain a temperature deviation compensation value:
Figure FDA0002777432320000059
wherein R isrefReceiving the RSSI value output by the reference source for the receiver at a specific constant temperature;
delta R is a temperature deviation compensation value; g (T) indicates that the temperature offset compensation value is a function of the real-time transmit gain control value T.
4. The apparatus of claim 3, wherein the ranging module is specifically configured to:
obtaining the current measured real-time emission gain control value, substituting the current measured real-time emission gain control value into a formula (6) to calculate the current temperature deviation compensation value delta Rreal；
Obtaining the RSSI value R of the current measurementrealThe currently measured RSSI value R is usedrealSubtracting the current temperature deviation compensation value DeltaRrealTo obtain a temperatureDegree compensation result values;
substituting the temperature compensation result value into a relation formula (7) between the transmitting power and the receiving power of the wireless signal to calculate the distance r between the transmitter and the receiver;
Rreal-ΔRreal＝A-10n lg r (7)，
wherein A is the theoretical power of the received signal when the reference source establishes the transmitting power signal transmission distance of 1 meter, and n is the propagation factor.
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