The way barometric altitude determination and device for its implementation

 

The invention relates to ground-based navigation technique and can be used to determine the height at an arbitrary point of the route relative to the initial point of movement on Board the vehicle or other ground rolling object when conducting geodetic, topographic and other types of shooting as while driving and while parked. The method consists in successive measurements for the source and each intermediate route points of the atmospheric pressure and air temperature, the processing of the measurement results with the determination of the height of each intermediate point of the route. Before the ground motion of a moving object during a stop at the starting point of the route for some time measure atmospheric pressure by the pressure sensor. Save the obtained values of atmospheric pressure in the storage device. During this period of time, during which write values of the atmospheric pressure measured by the timer. Since the beginning of the motion record in the storage device is stopped. Recorded in the storage device barometric pressure is calculated creeu the route point on the relevant formulas. The determination of the corrections to the measured value of the atmospheric pressure and altitude at each point of the route is done with the help of a calculator aboard the ground of a moving object in real time and during the movement of terrestrial mobile object and in the Parking lot. Device for height measurement includes an atmospheric pressure sensor, air temperature sensor, calculator, mass storage device, the motion sensor and timer, which are interconnected in an appropriate way. The technical result consists in increasing the accuracy of the determination of the height, reducing the cost of equipment, obtaining information about the current height value in real time aboard the ground of a moving object in motion and parked. 2 S. p. f-crystals, 1 Il.

The group of inventions relates to the field of ground-based navigation equipment and can be used to determine the height at an arbitrary point of the route relative to the starting point of the route on Board the vehicle or other ground rolling object (NGOs) in the implementation of geodetic, topographic and other types of shooting areas as while driving, and the time measurement of atmospheric pressure and meteorological parameters as aboard NGOs, and on a fixed base station that is installed in the base point of the pressure stroke, the absolute height of which is known; - the calculation of the pressure difference on the Board of the NGOs in relation to a reference point; calculating by the barometric formula elevations NGOs.

In this case, all calculations are performed after completion of the pressure stroke, and to transmit information to the base station on the side (regular) station and mutual synchronization of the stations connect them via a communications interface.

The described method has the following disadvantages: - to implement the method, you must have two sets of equipment, which increases cost and reduces reliability; - to perform calculations and information exchange with the base station NGOs should return the end point of the route to the base station, which increases the total time required for measurements and thus reduces productivity; it is impossible timely information about the height of onboard NGOs in the process, because information processing is carried out after completion of the pressure stroke.

A prototype of the proposed method is a method of barometric leveling on auto. St. 1825980 [2], including the CSOs pressure and temperature, processing of results of measurements with finding barometric stage, preliminary exceedance values in each intermediate point barometric move relative to the starting point, the definition of the amendments to the computed value of the barometric level by more measurements of the second point relative to the first measured the vertical distance and the calculation of the amendments on the relevant formulas.

This method is characterized by considerable uncertainty, defined by changes in atmospheric pressure over time. In addition, for measurements necessary to stop NGOs.

The invention is directed to reducing the time information about the current height value, obtaining information in real time aboard the NGOs in the process of moving and parked, reducing the error to determine the height determined by the change in atmospheric pressure over time.

This technical result in the implementation of the invention is achieved in that before moving NGOs for some time is the continuous measurement of atmospheric pressure and recording the received prekraschaetsya.

Then calculates the average rate of change of atmospheric pressure according to the formulawhere n is the number recorded in the storage device values of atmospheric pressure, an even integer, Vp- the average rate of change of atmospheric pressure, PA;
Pu- the atmospheric pressure (PA) having a sequence number u= (n/2)+1;
Pn- the atmospheric pressure, having a sequence number n, PA;
P1- the atmospheric pressure, having a sequence number 1, PA;
Pkthe value of atmospheric pressure. PA with sequence number k=n/2;
t0- recording time values of atmospheric pressure in the storage device C.

Next, determine the correction to the measured atmospheric pressure value at each point of the route according to the following formula
Pi= -AVpti, (2)
wherePi- amendment to the measured value of the atmospheric pressure, PA;
A - factor calibration;
Vp- the average rate of change of atmospheric pressure, PA;
ti- the length of time from the beginning of the movement until Costigan the>
where Hi- height in the i-th point of the route, m;
H0well - known height at the starting point of the route, m;
T0- the air temperature at the starting point of the route,o;
Ti- the air temperature in the i-th point of the route,oC;
P0- atmospheric pressure at the starting point of the route, PA;
Pi- atmospheric pressure in the i-th point of the route, PA;
Pi- amendment to the measured value of the atmospheric pressure PA.

The determination of the corrections to the measured atmospheric pressure value according to the formula (2) and the height at each point of the route by the formula (3) produced with the assistance of the evaluator, to be placed aboard the ground rolling object that allows you to define these values in real-time while driving and while parked object.

As R0in the formula (3) is the last value of the atmospheric pressure measured before starting the movement of the object at the starting point of the route.

The physical essence of the invention consists in the following. When the object is moving along the route on the amount of atmospheric pressure, measured on Board of an object is affected by two factors: izmeny factor, as the impact of weather changes the value of the atmospheric pressure Pithat leads to errors in the determination of the height Hi). The proposed solution is aimed at compensating errors in the determination of height caused by exposure to weather conditions. For this purpose it is offered during the stay, when the height of the object unchanged and the amount of atmospheric pressure, measured onboard the object is only affected by the weather conditions, to determine the average rate of change of atmospheric pressure Vp. The value of Vpshows the average rate of change of atmospheric pressure under the influence of weather conditions. Then the object starts to move along the route. At each point of the route in which you want to determine the height, first determine the amount of amendmentPicompensating the influence of weather conditions, according to the formula (2), and then calculate the height Hiby the formula (3). This assumes that the average rate of change of atmospheric pressure Vpduring the movement does not change. The calibration factor And allows you to more accurately account for the influence of weather conditions during the measurements in different geographical areas at different times gototraining points on the calibration plot. The criterion for the correctness of the choice of the coefficient a is the minimum mean-square error of determination of the height of the control points by the claimed method.

We offer the barometric method for determining the height allows you to:
to reduce exposure time and thereby increase productivity, since there is no need to return the end point of the route to the base station;
- obtain information about the current height value in real time aboard the NGOs in the process of moving and Parking lots;
to reduce the error in the determination of the height determined by the change in atmospheric pressure over time.

Known system barometric leveling of the patent 2104487 [1], comprising a base and at least one regular barometric devices, each of which contains a unit of measurement of meteorological parameters.

The disadvantages of this system are as follows:
- the need for two sets of equipment, which increases cost and reduces reliability;
- the necessity of returning the NGOs with the end point of the route to the base station for connecting the base pressure of the instrument with the public via the communication interface and the second and thus reduces productivity;
- the impossibility of timely information about the height of onboard NGOs in the process, because information processing is carried out after completion of the pressure stroke.

A device - meter height for aircraft on author. St. 1485049 [3]. This device, which is the prototype of the proposed contains a pressure sensor, air temperature sensor and the number of nodes, providing processing of the data. The device enables the determination of the height of the aircraft above the ground level at the point of takeoff.

This meter height does not take into account the change in atmospheric pressure over time, which reduces the accuracy of the determination of the height.

The drawing shows a block diagram of a device that implements the proposed barometric method of determining height.

The technical result is achieved in that in a device for measuring altitude, barometric method containing an atmospheric pressure sensor, air temperature sensor and the transmitter, put the memory device, the motion sensor and timer, and the outputs of the sensors of atmospheric pressure and air temperature are connected respectively to the first and second ports of the computer and the storage device, oram functioning of the device implements the method of barometric altitude determination, above.

The device comprises an atmospheric pressure sensor 1, the air temperature sensor 2, the transmitter 3, storage device 4, the motion sensor 5, a timer 6. The transmitter 3 receives the values of atmospheric pressure and air temperature sensors 1 and 2, writes the values of atmospheric pressure in the storage device 4, calculates the average rate of change of atmospheric pressure by the formula (1), and calculates the adjustment value to the measured atmospheric pressure value at each point of the route by the formula (2), calculates the height of each point of the route by the formula (3), communicates with the on-Board Central computer NGOs (computer). The motion sensor 5 generates a signal "Movement" in the NGO movement and the signal "Parking" - during a stop. The timer 6 carries out the timing.

The device operates as follows.

Once the NGO is at the start point of the route and on the device power from the computer to the transmitter 3 is entered, the height of the starting point. As with motion sensor 5 in the transmitter 3 receives the signal "Parking" (NGOs is not moving), the computer 3 after entering But starts the timer 6 at the timing of the accumulation of data and still is to an NGO starts to move, with motion sensor 5 in the transmitter 3 receives the signal "Movement", in which the transmitter 3 stops the timer 6, and stops recording the barometric pressure in the storage device 4. Then the calculator 3 calculates the average rate of change of atmospheric pressure by the formula (1), the time t0read from timer 6.

Next, the computer 3 starts the timer 6 for counting time elapsed from the beginning of the route, calculates at predetermined points of the route amendment to the measured atmospheric pressure value according to the formula (2) and height according to the formula (3), the time tiwhen carrying out calculations by formula (2) is read from the timer 6.

The proposed device to determine the height that implements the above method barometric altitude determination, allows you to:
to improve the accuracy of the determination of the height due to the compensation rate of change of atmospheric pressure,
to reduce the cost of equipment, because for measurements need only one set of equipment placed on NGOs,
to ensure the determination of the height in real time aboard the NGOs in the process of moving and parked.

The effect is as described device. As shown by the experimental results, the proposed method can reduce the error in the determination of the height determined by the change in atmospheric pressure at time 2. . . 5 meters for 50 minutes of driving at the time of measurement of the rate of change of atmospheric pressure for 10 minutes.

LITERATURE
1. RF patent 2104487, 14.06.95, G 01 C 5/06, BI 4, 1998, page 353.

2. The copyright certificate of the Russian Federation 1825980, 09.04.90, 5 G 01 C 5/06, BI 25, 1993, page 59.

3. USSR author's certificate 1485049, 27.04.87, G 01 L 7/12, G 01 C 5/06, BI 21, 1989, page 177.


Claims

1. The way barometric determination of the height at an arbitrary point of the route of terrestrial mobile object relative to the starting point of the route, which consists in the successive measurement of the source and each intermediate route points of the atmospheric pressure by the pressure sensor and air temperature through the temperature sensor, the processing of the measurement results with the determination of the height of each intermediate point of the route, characterized in that before the ground motion of a moving object during a stop at the starting point of the route for some time produce a continuous measurement of the atmosphere is to be placed in the storage device, during this period of time, during which write values of the atmospheric pressure measured by the timer, since the beginning of the motion record in the storage device stop, recorded in the storage device barometric pressure to calculate the average rate of change of atmospheric pressure according to the formula

where n is the number recorded in the storage device values of atmospheric pressure, an integer is an even number;
Vp- the average rate of change of atmospheric pressure, PA;
Pu- the atmospheric pressure (PA) having a sequence number u= (n/2)+1;
Pn- the atmospheric pressure, having a sequence number n, PA;
P1- the atmospheric pressure, having a sequence number 1, PA;
Pk- the atmospheric pressure (PA) having a sequence number k=n/2;
t0- recording time values of atmospheric pressure in the storage device,
determine a correction to the measured atmospheric pressure value at each point of the route by the formula
Pi=AndVpti,
where
where Ni- height in the i-th point of the route, m;
H0well - known height at the starting point of the route, m;
T0- the air temperature at the starting point of the route,o;
Ti- the air temperature in the i-th point of the route,o;
P0- atmospheric pressure at the starting point of the route, PA;
Pi- atmospheric pressure in the i-th point of the route, PA;
Pi- amendment to the measured value of the atmospheric pressure PA,
and the definition of the amendments to the measured value of the atmospheric pressure and altitude at each point of the route is done with the help of a calculator aboard the ground of a moving object in real time during the movement of terrestrial mobile object, and in the Parking lot.

2. Device for measuring the height at an arbitrary point of the route of terrestrial mobile object relative activities is the temperature of the air, the evaluator, and the outputs of the sensors of atmospheric pressure and air temperature are connected respectively to the first and second ports of the transmitter, characterized in that it introduced a storage device, the motion sensor and timer, and a storage device, a motion sensor and a timer connected respectively to the third, fourth and fifth ports of the transmitter, and the algorithm of functioning of the device implements the method of barometric altitude determination under item 1.

 

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