RU91184U1 - SIGNAL SOURCE COORDINATE DETERMINATION DEVICE - Google Patents

Abstract

A device for determining the coordinates of the signal source, containing an alarm sensor, three antennas, two time difference meters, an indication unit, characterized in that it contains three alarm sensors, outputs 1, 2, 3 of which are connected via a radio channel to the inputs of antennas 4, 5, 6, outputs antennas 4, 5, 6 are connected to the inputs of amplifiers 7, 8, 9, the outputs of amplifiers 7, 9 are connected to the inputs of communication lines 10, 12, the output of communication line 10 is connected to the first input of the time difference meter 11, the output of amplifier 8 is connected to the second input time difference meter 11, you the communication line 12 is connected to the third input of the time difference meter 11, the output of which is connected to the input of the coordinate calculator of the signal sensors 13 and the second input of the coordinate calculator of the signal source 14, the output of the latter is connected to the second input of the display unit 15, the output of the coordinate calculator of the signal sensors 13 is connected with the first input of the source coordinate calculator 14 and the indication unit 15.

Description

The utility model relates to the field of radio navigation aids and can be used in specialized navigation systems. The technical result achieved is the ability to determine the coordinates of the signal source, the physical nature of which is determined by the nature of the functional tasks performed by the object. The signal can be: electromagnetic in the visible, infrared (thermal) and radio waves, acoustic, seismic, etc.

In known devices for determining the coordinates or azimuth of a source of radio emission (IRI) perform the following operations:

- have three antennas at the vertices of the triangle;

- receive an IRI signal to all three antennas;

- measure the difference in the time of reception of the signal of the IRI antenna, forming the measuring base;

- calculate either the azimuth of the IRI, or the coordinates of a point belonging to the position line, or the coordinates of the IRI.

In this case, the last operation is performed on the basis of the differential-ranging method of determining the location of the IRI.

In known devices for determining the coordinates or azimuth of the source of radio emission (IRI) perform the following operations:

- have three antennas at the vertices of the triangle;

- receive an IRI signal to all three antennas;

- measure the difference in the time of reception of the IRI signal to the antennas forming the measuring base;

- calculate either the azimuth of the IRI, or the coordinates of the IRI.

In this case, the last operation is performed on the basis of the differential-ranging method of determining the location of the IRI.

As a prototype of the selected device presented in figure 1 [1].

In this device, the difference in the time of reception of the signal from the source of radio emission is measured by antennas forming two measuring bases. The procedure for measuring the time difference, unfortunately, is not disclosed in this device. When transmitting a radio signal from the antenna to the difference meters, the propagation time should be taken into account, since the negation of this fact will lead to significant errors in determining the coordinates of the IRI. If we assume that the arrival time of the radio signal is fixed on each of the antennas, then it follows that each of the antennas should have a time standard, while the zero values of the time scales of all standards should be consistent. The technical implementation of setting time standards and harmonizing their scales is a complex and expensive task.

The prototype device is aimed only at determining coordinates (bearing) to a source of radio emission, the possibility of determining the coordinates of a signal source of a different physical nature is excluded. Known transceiver alarm systems, for example [3], converting a signal of a different physical nature into an electrical signal, followed by encoding it, transferring it to a radio frequency with radiation (Figure 3). In the proposed device, the transceiver alarm system is called an alarm sensor while maintaining the structure and functions. Signaling devices are installed on stationary objects and are used to fix the fact of the appearance of a signal source. The coordinates of the carrier of the signal source can be determined approximately from the known coordinates of the alarm sensor when they are in close proximity.

The disadvantages of the prototype are:

- the inability to determine the coordinates of the signal source of any physical nature;

- not accounting for the propagation time of the radio signal from the antennas to the time difference meters.

The purpose of the utility model is to provide the ability to determine the coordinates of the signal source and taking into account the propagation time of the radio signal from the antennas to the time difference meter.

The goal is achieved by performing the following sequence of actions.

1. After the remote installation of the alarm sensors thrown into the area of the alleged location of the signal source using delivery vehicles (projectile, rocket, plane), determine their rectangular coordinates, for which (Figure 5) receive the radio signal of each of the signal sensors with antennas A ₁ , A ₂ , A ₃ , after amplification, they relay radio signals from the side antennas A ₁ , A ₃ to the central A ₂ and measure the time differences ( , ) j = 1,2,3 arrival of electromagnetic energy to the antenna And ₂ :

a) from the first alarm sensor (Figure 5)

Where - the transit time of electromagnetic energy from the first signaling sensor to the i-th antenna (i = 1,2,3);

- the transit time of electromagnetic energy from the antenna "i" to the meter at the antenna And ₂ ;

b) from the second alarm sensor

c) from the third alarm sensor

By solving a system of equations, the coordinates are calculated:

a) the first alarm sensor ( )

where ( ) are the known coordinates of the antennas;

c = 3 ∗ 10 ⁸ m / s is the propagation velocity of electromagnetic energy;

b) the second alarm sensor ( )

c) the third alarm sensor ( )

We show the procedure for obtaining systems (4), (5), (6) using the first equation of system (4) as an example. When we multiply the right and left sides of equality (1) by the propagation velocity of the radio wave “c” we get:

Where - the distance between the first alarm sensor and the first (second) antenna.

Equation (7) is the equation of the difference-ranging method, taking into account the propagation time of the radio signal from the antennas A ₁ A ₃ to the time difference meter located at the central antenna A ₂ .

2. Transfer the source signal received by the signaling sensors to the radio frequency and relay from the 1st (2nd, 3rd) signaling sensor to the central antenna A ₂ and measure the difference in the time of arrival of the radio signal relative to the time of arrival at the central post (Fig. 6)

π

where t _id1 , t _id2 , t _id3 - the propagation time of the signal from the radiation source to the alarm sensors D ₁ , D ₂ , D _3, respectively;

t _d1a1 , t _d2a2 , t _d3a3 — propagation time of the radio signal from the alarm sensors SD ₁ , SD ₂ , LED ₃ to antennas A ₁ , A ₂ , A _3, respectively;

t _a1a2 , t _a3a2 - propagation time of the radio signal from antennas A ₁ , A ₃ to antenna A ₂ .

3. Calculate the propagation time of electromagnetic energy from the signal sensors to the antennas and between the antennas

and meanings

,

.

4. Calculate the difference in time of arrival of the signal from the source to the first and second signaling sensors and from the source to the third second signaling sensors (Fig.6):

,

.

5. Calculate the coordinates of the signal source by solving the system of equations

where a is the propagation speed of the signal generated by the source.

The composition of the claimed device includes (Figure 2):

1. antenna 1;

2. antenna 2;

3. antenna 3;

4. amplifier;

5. amplifier;

6. amplifier;

7. communication line;

8. time difference meter;

9. communication line;

10. calculator of coordinates of alarm sensors;

11. calculator coordinates of the signal source;

12. indication unit;

13. alarm sensors.

Figure 3 presents the structural diagram of the alarm sensor [4]. After the remote installation of three alarm sensors (blocks 1, 2, 3) in the area of the possible appearance of the signal source, their rectangular coordinates are determined. To this end, the radio signal emitted by each signaling sensor is received by antennas (blocks 4, 5, 6) and amplified (in blocks 7, 8, 9) and through communication lines (blocks 10, 12) from the first A ₁ (block 4) and the third A ₃ (block 6) antennas are relayed to the central And ₂ (block 5). Two time differences and (i = 1,2,3, dependencies (1), (2), (3)) forms a time difference meter (block 11) by the radio signal from each alarm sensor. The transmitter of coordinates of the signaling sensors (block 13), based on the known coordinates of the antennas, the measured time differences, solves the system (4), (5), (6) by determining the coordinates of the signaling sensors, which are fixed in the display unit (block 15) and fed to the source coordinate calculator signal (block 14).

With the advent of the signal source, to which the alarm sensors respond (blocks 1, 2, 3), the signal is transferred to the radio frequency and relayed from the first (second, third) sensor through the first (second, third) antenna (blocks 4, 5, 6) to the time difference meter (block 11), determine Δt _{1 ism} , Δt _{2 ism,} and the measured differences are fed to the 2 input of the signal source coordinate calculator (block 14).

In block 14: calculate the propagation time of the radio signal from the first (second, third) sensor to the first (second, third) antenna and between the side and central antennas in accordance with the dependence (9); calculate the difference in the time of arrival of the signal from the source to the first and second sensors and from the source to the third and second sensors according to the dependences (10).

The coordinates of the signal source (x _and , y _and ) are calculated by solving the system of equations (11). The obtained coordinates are fed to the display unit (block 15).

Thus, the claimed capabilities of the developed device for determining the coordinates of the signal source (sound, infrared, seismic, etc.) and for taking into account the propagation time of the radio signal from the antennas to the time difference meter are fulfilled.

List of sources used

1. Saibel A.G. Difference-range measuring method for determining the coordinates of a source of radio emission and the device realizing it. RF patent No. 2309420 dated 10.27.2007.

2. Saibel A.G. Difference-range measuring method of direction finding of a source of radio emission and device realizing it. RF patent No. 2298242 of 02.20.2005.

3. Bersenev A.I. Transceiver alarm system. RF patent №2025780 from 12.30.1994

4. Saibel A.G. Difference-range measuring method of direction finding of a source of radio emission and device realizing it. RF patent No. 2003118800 dated 02.20.2005.

Claims (1)

A device for determining the coordinates of a signal source, containing an alarm sensor, three antennas, two time difference meters, an indication unit, characterized in that it contains three alarm sensors, outputs 1, 2, 3 of which are connected by radio channel to the inputs of antennas 4, 5, 6, outputs antennas 4, 5, 6 are connected to the inputs of amplifiers 7, 8, 9, the outputs of amplifiers 7, 9 are connected to the inputs of communication lines 10, 12, the output of communication line 10 is connected to the first input of the time difference meter 11, the output of amplifier 8 is connected to the second input time difference meter 11, you the communication line 12 is connected to the third input of the time difference meter 11, the output of which is connected to the input of the coordinate calculator of the signaling sensors 13 and the second input of the coordinate calculator of the signal source 14, the output of the latter is connected to the second input of the display unit 15, the output of the coordinate calculator of the signaling sensors 13 is connected with the first input of the source coordinate calculator 14 and the indication unit 15.