CN113670311A - Indoor pedestrian state perception and positioning tracking system, method, equipment and medium - Google Patents
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Abstract
The invention provides an indoor pedestrian state perception and positioning tracking system, which comprises: the mobile terminal is provided with a plurality of mobile terminals; the mobile terminal comprises an inertia measurement module, a sensor acquisition module, a communication module, a serial port module and a monitoring application module; the sensor acquisition module acquires real-time data generated by the inertia measurement module and then sends the real-time data to the monitoring application module through the serial port module; the monitoring application module reads the real-time data of the serial port module and analyzes and judges the real-time data; the real-time status information and the information of the floor where the monitored personnel are located can be checked through connecting the communication module. The invention can realize real-time monitoring and position positioning tracking of indoor pedestrian states, does not need to arrange a monitoring environment in advance, does not need to restrict the monitored pedestrian condition in advance, has low cost and strong reliability, is expected to provide a brand new research direction for indoor positioning, and has profound and remote significance.
Description
Technical Field
The invention relates to the technical field of indoor navigation, in particular to a system, a method, equipment and a medium for sensing, positioning and tracking indoor pedestrian states.
Background
It is known that the GPS/BD positioning and navigation system cannot be normally used indoors due to various factors such as complicated indoor environments and signal interference. However, in real life, people are mostly indoor, and therefore, it is a research hotspot of scientists to study the indoor personnel state and to perform indoor high-precision positioning and tracking. Along with the proposal that the state is greatly promoting novel intelligent city construction, the adoption of data calculation and analysis acquired by an inertial sensor (IMU sensor) to realize behavior recognition of indoor personnel is also a new research direction in the field of mode recognition, and has wide application prospect in monitoring the real-time state of old people in a nursing home, monitoring the indoor state of prisoners and assisting the disaster relief of hospitals and indoor firefighters.
Through retrieval, patent document CN108444473B discloses a pedestrian indoor track positioning method, which includes the following steps of acquiring three-axis acceleration, three-axis angular velocity and three-axis magnetic induction intensity under a carrier coordinate system by using a sensor as a data source, wherein the three axes are an X axis, a Y axis and a Z axis; step counting and gait detection are carried out; calculating a course angle, and correcting the course angle based on the main direction: when a straight line is taken, correcting a course angle by using a heuristic random drift elimination method; when a curve is traced, offset compensation is carried out by using an extended Kalman filter, and a course angle is corrected; establishing a nonlinear step length estimation model according to the triaxial acceleration, and calculating the step length in the advancing process; and calculating the walking track and position of the pedestrian according to the gait, the number of the advancing steps, the course angle and the step length. Although this prior art also uses nine-axis sensor data to locate the indoor pedestrian trajectory, it does not relate to and address the monitoring of the behavior state of the monitored person and the information of the height of the monitored person.
Patent document CN104634345B discloses an indoor track tracking method with adaptive step length, which judges whether the vehicle is in a walking state by setting the initial speed and the end speed of each step to be zero, and if so, collects the number of accelerations in each step, and calculates and obtains the step length of the first step according to the acceleration and the sampling time of the acceleration; and combining the direction of each step, and superposing the vectors of each step to obtain the motion track. The prior art estimates the step length of the pedestrian by adopting a self-adaptive mechanism, has the defects of obvious defect, large calculated amount and single realized function.
Patent document CN107976187B discloses an indoor trajectory reconstruction method and system fusing an IMU and a visual sensor, including: receiving real-time acquisition data sent by an IMU; predicting and optimizing the motion trail of the pedestrian according to the real-time collected data; receiving indoor environment information acquired by a visual sensor; and positioning and correcting the motion trail of the pedestrian according to the indoor environment information and the real-time collected data, and reconstructing to obtain the final motion trail of the pedestrian. In the prior art, IMU data is used for indoor track reconstruction, but the height and weight ratio of pedestrians need to be preset in an actual method and an implementation process, so that the prior art is not universal and is difficult to be practically applied.
Therefore, it is necessary to develop a high-precision indoor positioning system and method with low cost, low power consumption, high stability and no need of arranging a monitoring environment in advance.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a system, a method, equipment and a medium for sensing, positioning and tracking the indoor pedestrian state, so that the real-time monitoring and position positioning and tracking of the indoor pedestrian state are realized, the monitoring environment does not need to be arranged in advance, the condition of the monitored pedestrian does not need to be restrained in advance, the cost is low, the reliability is strong, a brand new research direction is expected to be provided for indoor positioning, and the system, the method, the equipment and the medium have profound significance.
The invention provides an indoor pedestrian state perception and positioning tracking system, which comprises: the mobile terminal is provided with a plurality of mobile terminals; the mobile terminal comprises an inertia measurement module, a sensor acquisition module, a communication module, a serial port module and a monitoring application module; the sensor acquisition module acquires real-time data generated by the inertia measurement module and then sends the real-time data to the monitoring application module through the serial port module; the monitoring application module obtains the state information of the monitored personnel and the information of the floor where the monitored personnel are located by reading the real-time data of the serial port module and analyzing and judging the real-time data; the real-time status information and the information of the floor where the monitored personnel are located can be checked through connecting the communication module.
Preferably, the inertial measurement module generates three-axis acceleration values, three-axis gyroscope values, three-axis magnetometers and barometer values in real time.
Preferably, the sensor acquisition module accesses a register of the inertial measurement module in real time through a serial bus protocol, and obtains real-time data generated by the inertial measurement module by reading a value of the register.
Preferably, the sensor acquisition module adopts a single chip microcomputer or an ARM processor.
The invention provides an indoor pedestrian state perception and positioning tracking method, which comprises the following steps:
step S1: the communication module is connected to check the real-time state information and the information of the floor where the monitored personnel are located;
step S2: the sensor acquisition module acquires real-time data generated by the inertia measurement module;
step S3: the sensor acquisition module transmits real-time data to the monitoring application module through the serial port module after acquiring the real-time data;
step S4: the monitoring application module reads the real-time data of the serial port module and analyzes and judges the real-time data.
Preferably, in step S2, the sensor acquisition module obtains real-time triaxial acceleration value, triaxial gyroscope value, triaxial magnetometers value, and barometer value data by reading the value of the register of the inertial measurement module, and integrates and packages the data and transmits the data through the serial port module.
Preferably, step S4 includes:
step S4.1: after the triaxial acceleration value passes through a low-pass filter, integrating triaxial acceleration and subtracting gravity acceleration to obtain a resultant acceleration;
step S4.2: the barometer value is converted into a height value data,pHis the atmospheric pressure value corresponding to the height H, and the unit is Pa, p0Is standard altitude atmospheric pressure, with a corresponding altitude of 0;
step S4.3: the data values on the carrier coordinate system are acquired by accessing the register of the inertial measurement unit module, and the acquired data are subjected to coordinate system conversion before algorithm addition.
According to the present invention, a computer-readable storage medium is provided, in which a computer program is stored, which, when being executed by a processor, carries out the above-mentioned method steps.
According to the indoor pedestrian state sensing and positioning and tracking device provided by the invention, the indoor pedestrian state sensing and positioning and tracking system or the computer readable storage medium storing the computer program is included.
Preferably, the device further comprises an inertia measurer, wherein the inertia measurer is provided with the model number ADIS 16488A.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the floor information of indoor personnel is brought into the indoor personnel state detection range for the first time through the real-time monitoring and position positioning tracking of the indoor pedestrian state.
2. According to the invention, the information such as the walking steps and the step length of the personnel is calculated by utilizing the acquired data acquired by the inertia measurement module in an indoor environment, the physical characteristic information of the monitored object does not need to be set in advance, and the method has the advantages of strong universality, high accuracy and wide application range.
3. The invention utilizes the collected data to calculate the real-time state of the personnel, including static state, walking state, running state, lying state and the like, and can master and know the state information of the monitored object in real time through the communication module.
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Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a block diagram of an indoor pedestrian state sensing and location tracking system according to the present invention;
fig. 2 is a flow chart of indoor pedestrian motion state perception determination in the invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
As shown in fig. 1, the present invention provides an indoor pedestrian state sensing and positioning tracking system, which includes: the mobile terminal is provided with a plurality of mobile terminals.
The mobile terminal comprises an inertia measurement module, a sensor acquisition module, a communication module, a serial port module and a monitoring application module; the sensor acquisition module acquires real-time data generated by the inertia measurement module and then sends the real-time data to the monitoring application module through the serial port module; the monitoring application module reads the real-time data of the serial port module and analyzes and judges the real-time data; the real-time status information and the information of the floor where the monitored personnel are located can be checked through connecting the communication module.
The inertial measurement module can generate a triaxial acceleration value, a triaxial gyroscope value, a triaxial magnetometers value and an barometers value in real time. The sensor acquisition module accesses a register of the inertia measurement module in real time through a serial bus protocol, and obtains real-time data generated by the inertia measurement module by reading the value of the register. The sensor acquisition module adopts a single chip microcomputer or an ARM processor.
The invention also provides an indoor pedestrian state perception and positioning tracking method, which comprises the following steps:
step S1: the real-time status information and the information of the floor where the monitored personnel are located can be checked through connecting the communication module. The inertial measurement module can generate triaxial acceleration values, triaxial gyroscope values, triaxial magnetometers and barometer data in real time.
Step S2: the sensor acquisition module acquires real-time data generated by the inertia measurement module; the sensor acquisition module accesses a register of the inertia measurement module in real time through a serial bus protocol, obtains the current triaxial acceleration value, triaxial gyroscope value, triaxial magnetometers value and barometer value data by reading the value of the register, integrates and packages the data, and sends the data through a serial port module; the sensor acquisition module is a single chip microcomputer or an ARM processor.
Step S3: the sensor acquisition module transmits real-time data to the monitoring application module through the serial port module after acquiring the real-time data;
step S4: and the monitoring application module reads the real-time data of the serial port module and analyzes and judges the real-time data. Specifically, as shown in fig. 2, the method includes the following steps:
step S4.1: and after the triaxial acceleration value passes through a low-pass filter, integrating triaxial acceleration and subtracting gravity acceleration to obtain a resultant acceleration so as to avoid errors caused by the acceleration in the gravity direction. Before the personnel state is judged, three acceleration threshold values are set, the personnel state is judged to be in a static state when the combined acceleration is smaller than a first acceleration threshold value, the personnel state is judged to be in a walking state when the combined acceleration is larger than the first acceleration threshold value and smaller than a second acceleration threshold value, and the personnel state is judged to be in a running state when the combined acceleration is larger than the second acceleration threshold value and smaller than a third acceleration threshold value.
Step S4.2: the barometer value is converted into a height value data,pHis the atmospheric pressure value corresponding to the height H, and the unit is Pa, p0Is standard altitude atmospheric pressure, with a corresponding altitude of 0; and when the combined acceleration value is greater than a third acceleration threshold value, the time of the last wave peak is greater than 0.4s, and the difference between the height value corresponding to the time of the last wave peak and the height value corresponding to the time of the monitored wave peak meets a certain condition, the state is a lying state.
Step S4.3: the data values on the carrier coordinate system are acquired by accessing the registers of the inertial measurement unit module, so that the acquired data are subjected to coordinate system conversion before algorithm addition is carried out. I.e. down-conversion from the carrier coordinate system (system b) to the navigation coordinate system (system n), i.e.WhereinIs a state transition matrix of the system, abIs a carrier coordinate system, anFor navigating the coordinate system, the specific formula is as follows:
wherein xb、yb、zbAre respectively the coordinate values, x, in the carrier coordinate systemn、yn、znThe coordinate values under the navigation coordinate system;
wherein,is a course angle, theta is a pitch angle, and gamma is a roll angle. The values of θ and γ are obtained by the sensor.
Where here is a quaternion coordinate transformation matrix representation, q0,q1,q2,q3And the four-element coefficient is the attitude four-element coefficient of the motion carrier.
wherein, amaxFor single step combined acceleration maximum, aminIs the minimum value of single-step intermediate acceleration, k and mu are undetermined coefficients, LsteplengthIn steps of a single step.
Wherein, XkIs the abscissa of time k, SkStep size at time k, θkIs the angle at time k.
The air pressure value is converted into a height value, the height value data at the moment of starting monitoring is recorded, when a monitored person goes upstairs or downstairs, the corresponding height value changes, and the height value recorded at the moment of starting monitoring are subjected to floor determination algorithm to perform floor positioning.
The invention makes statistics on the actual measurement data of indoor pedestrian state perception and positioning tracking as follows:
TABLE 1 motion State perception experiment
Table 1 shows the exercise status sensing experiment, 4 testers with different heights and weights and both men and women were selected to perform the experiments of 50 steps in a straight line, 50 steps in a running line and 10 times in a lying line respectively twice.
TABLE 2 floor location experiment data comparison
Table 2 shows comparison of floor positioning experimental data, in which a tester starts to walk up from a first-floor stair, records and measures height data when walking to a second-floor stair, and then continuously walks from the second-floor stair to the third-floor stair to record the height data again, and continuously walks from the third-floor stair to the fourth-floor stair to record the height data;
TABLE 3 indoor 100 m positioning experiment data comparison
Table 3 shows the comparison of indoor 100 m positioning experimental data, and three indoor buildings were selected, which are: indoor corridor, underground garage, shopping mall etc. compare more common indoor environment, 4 testers carry out the straight line respectively and walk 100 meters in three kinds of indoor environment, and the software will carry out pedestrian position tracking distance comparison in real time.
The invention further provides a computer-readable storage medium having a computer program stored thereon, which, when being executed by a processor, carries out the steps of the method as described above.
The invention further provides an indoor pedestrian state sensing and positioning and tracking device, which comprises the indoor pedestrian state sensing and positioning and tracking system or the computer-readable storage medium with the computer program stored therein. Also comprises an inertia measurer, and the model of the inertia measurer is 16488A.
The invention can analyze the track of the indoor personnel and also adds a motion state sensing system of the indoor personnel, thereby mastering the floor and motion posture of the personnel in real time. The invention has more comprehensive, specific and diversified performances.
The invention explains the implementation mode of detecting the motion attitude of the indoor pedestrian in detail and also increases the function of judging the floor information of the indoor pedestrian, and the invention has more comprehensive and concrete performance.
The invention adopts a more classical nonlinear step length estimation model in the step length estimation, and carries out certain correction on the model, thereby effectively reducing the gait detection error and improving the step length estimation precision.
Those skilled in the art will appreciate that, in addition to implementing the system and its various devices, modules, units provided by the present invention as pure computer readable program code, the system and its various devices, modules, units provided by the present invention can be fully implemented by logically programming method steps in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Therefore, the system and various devices, modules and units thereof provided by the invention can be regarded as a hardware component, and the devices, modules and units included in the system for realizing various functions can also be regarded as structures in the hardware component; means, modules, units for performing the various functions may also be regarded as structures within both software modules and hardware components for performing the method.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. An indoor pedestrian state perception and location tracking system, comprising: the mobile terminal is provided with a plurality of mobile terminals;
the mobile terminal comprises an inertia measurement module, a sensor acquisition module, a communication module, a serial port module and a monitoring application module;
the sensor acquisition module acquires real-time data generated by the inertia measurement module and then sends the real-time data to the monitoring application module through the serial port module;
the monitoring application module obtains the state information and the floor information of the monitored personnel by reading the real-time data of the serial port module and analyzing and judging the real-time data;
the communication module can be connected to check the real-time state information and the information of the floor where the monitored personnel are located.
2. The indoor pedestrian state sensing and location tracking system of claim 1, wherein the inertial measurement module generates three-axis acceleration values, three-axis gyroscope values, three-axis magnetometers and barometer values in real time.
3. The indoor pedestrian state sensing, positioning and tracking system according to claim 1, wherein the sensor acquisition module accesses a register of the inertial measurement module in real time through a serial bus protocol, and obtains real-time data generated by the inertial measurement module by reading a value of the register.
4. The indoor pedestrian state sensing, positioning and tracking system of claim 1, wherein the sensor acquisition module employs a single-chip microcomputer or an ARM processor.
5. An indoor pedestrian state perception and positioning tracking method is characterized by comprising the following steps:
step S1: the communication module is connected to check the real-time state information and the information of the floor where the monitored personnel are located;
step S2: the sensor acquisition module acquires real-time data generated by the inertia measurement module;
step S3: the sensor acquisition module transmits real-time data to the monitoring application module through the serial port module after acquiring the real-time data;
step S4: the monitoring application module reads the real-time data of the serial port module and analyzes and judges the real-time data.
6. The indoor pedestrian state sensing, positioning and tracking method according to claim 5, wherein in step S2, the sensor acquisition module obtains real-time three-axis acceleration value, three-axis gyroscope value, three-axis magnetometers value and barometer value data by reading the value of the register of the inertial measurement module, and integrates and packages the data and sends out the data through the serial port module.
7. The indoor pedestrian state sensing and location tracking method according to claim 6, wherein the step S4 includes:
step S4.1: after the triaxial acceleration value passes through a low-pass filter, integrating triaxial acceleration and subtracting gravity acceleration to obtain a resultant acceleration;
step S4.2: the barometer value is converted into a height value data,pHis the atmospheric pressure value corresponding to the height H, and the unit is Pa, p0Is standard altitude atmospheric pressure, with a corresponding altitude of 0;
step S4.3: the data values on the carrier coordinate system are acquired by accessing the register of the inertial measurement unit module, and the acquired data are subjected to coordinate system conversion before algorithm addition.
8. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method of any one of claims 5 to 7.
9. An indoor pedestrian state perception and location tracking device, comprising the indoor pedestrian state perception and location tracking system of any one of claims 1 to 4 or the computer readable storage medium of claim 8 having a computer program stored thereon.
10. The indoor pedestrian state sensing and location tracking device of claim 9, further comprising an inertial measurer, model number ADIS 16488A.
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