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Ranging method and device to determine coordinates of radiation source. RU patent 2506605.

Ranging method and device to determine coordinates of radiation source. RU patent 2506605.
IPC classes for russian patent Ranging method and device to determine coordinates of radiation source. RU patent 2506605. (RU 2506605):

G01S5/00 - Position-fixing by co-ordinating two or more direction or position-line determinations; Position-fixing by co-ordinating two or more distance determinations
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FIELD: measurement equipment.

SUBSTANCE: invention relates to the field of determination of location of radiation sources. The specified result is achieved by the fact that at least in three mutually distanced points of reception, levels of a radio signal are measured from the source of radiation with available energy characteristics, which characterise the value of signal attenuation in the distribution channel, then, by the value of this attenuation, the distance is calculated from the object of radiation to each of the receiving stations, and using the coordinate information on location of the receiving stations, they calculate coordinates of the object of radiation. The device to determine Cartesian coordinates of the source of radiation includes at each point of reception: a non-directed antenna sensor of a half-wave vibrator; a radio receiver with an analog-digital converter at the outlet; metres of energy or amplitude of the received signal; a calculator of the distance from the source of radiation and one that combines data at receiving stations, a calculator of coordinates of the source of radiation. Coordinates of the radiation source are calculated according to formulas given in the text of invention description.

EFFECT: detection of coordinates of location of a source of radiation of available intensity in passive mode under conditions of no mutual time synchronisation of receiving stations.

2 cl, 2 dwg

 

The technical field to which the invention relates:

The invention relates to the field of positioning by matching in one coordinate system of three or more found distances (G01S 19/00) using radio waves (G01S 005/02) and can be used to provide a solution of navigation problems in air traffic control systems, marine navigation systems, the rescue service of ships, aircraft and other aircraft in distress. The level of technology:

Existing far-measuring methods for determining the location of objects of radio emission are based on measuring of phase or temporary delay of the wavefront at distribution of its radiation from the object to each of passive receivers [1]. Such measurements can be carried out only through the use of active query to radiation from a source with a strict time or phase synchronization between the receivers, which is a restriction on their use.

Another analogue of the invention is a difference-rangefinder method of definition of coordinates of the source of radio emission and realizing it device [2]:

The invention relates to the definition of the coordinates of the source of radio radiation (IRI) in space. The inventive as surfaces provisions Iran used the plane containing the line position of IRI, representing the intersection of two hyperbolic surfaces provisions of the relevant difference-temporal dimensions. The method is based on signal reception IRI four antennas, measuring three differences times of signal reception Iran antennas, forming the gage, post-processing the results of measurements in order to calculate the values of the parameters of the provisions of the Islamic Republic and calculating the coordinates of Iran as the point of intersection of the three planes provisions. The proposed device contains four antennas, which form three pair of measuring bases in mismatched planes, three characteristic calculator provisions of the IRI, the coordinates of the Islamic Republic in the form of the block of solving the system of linear equations and indication unit. Achievable technical result is to provide an unambiguous determination of linear coordinates of the object. Disadvantages of this method and devices as are necessary to strictly mutual timing reception points due to the necessity of measuring the time difference of the signal on each of the stations.

Third, a similar rangefinder way to determine the location of the radio station on a difference of the parish of the signal in time receiving points [3]. The invention relates to the field direction finding and can be used in the rescue service of ships, aircraft and other aircraft in distress. The purpose of the invention is increasing the accuracy of determining the location of running a radio station. This goal is achieved by the fact that at least three collection points located on the same line, measured moments of the arrival time of the signal running a radio station t a , t b and t c . Then, set the time delay of the parish of the signal at the other two points of the reception on the third. Time delay joining strength of the receiving points are calculated distance, passed radio signal, according to the formula

R i =cΔt i ,

where C is the speed of light, Dt i - lag time of the parish of the signal at the point of reception. After that calculated the distance from the reception points to the locations of the radio station by the formulas given in the description of the invention. This method also allows to make measurement location in the absence of timing between the adoptive points.

The prototype of the invention is a way to determine the location of the aircraft and the system, it handles described in [4]. On Earth there are three pulse radar stations whose coordinates are known precisely, and the planes are to be supplied . Measure three time τ 1 , t 2 , and t 3 signals between ground stations and aircraft and the appropriate distance R 1 , R 2 and R 3 . On the Central point of processing (COE) define the coordinates of the aircraft in a rectangular Cartesian coordinate system (figure 1). The system of equations linking the Cartesian coordinates of the source of radio emission and the distances measured in the present case has the following form:

; ;

Adopted the following location points of the system: points 1, 2, 3 - at the vertices of an equilateral triangle with sides equal to d, point 1 and 2 - axis symmetrically relative to the start, point 3 on the Y-axis at a distance from the origin and

. The angular position of the objects of observation is defined by the azimuth of the α and the elevation angle of?. This method requires the organization of the radio channel the request-response and mutual timing points of reception.

The essence of the invention:

The purpose of the invention consists in the definition of coordinates of emitters known intensity in passive mode in conditions of absence of the relative time synchronization points of reception.

This goal is achieved by the proposed rangefinder method of definition of coordinates of emitters according to the measurements in at least three mutually distant points of the reception of radio signals, which consists in the fact that at the points of produce definition of distance from the source of the radio emission to each of the points of reception and received by distances calculated coordinates of emitters, while taking points define the intensity of the signal source, and then largest intensities signals calculate the distance from the source of the radio emission to each of the points of largest signal attenuation on the track propagation from the source of the radio emission to reception point.

Distance measurement largest signal intensity is essential sign, because this measurement does not require mutual timing of collection points and can be done in the passive mode of collection points.

This goal is responsible for determining the Cartesian coordinates of the source of radio radiation (figure 1), which includes three spatially separated omnidirectional antenna type a vibrator 1, 2 and 3; three radio 4, 5 and 6; three analog-to-digital Converter 7, 8 and 9; three meter the signal energy 10, 11 and 12; three calculator distance of 13, 14 and 15 and the evaluator of the coordinates of the source of radio emission 19. The antenna 1, radio 4, analog-to-digital Converter 7, the energy of a signal 10 and calculator distance of 13 are connected in series to form the first receiver 16; antenna 2, radio 5, analog-to-digital Converter 8, the energy of a signal 11 and computer-range 14 are connected in series to form a second receiver 17; antenna 3, radio 6, analog-to-digital Converter 9, the energy of a signal 12 and computer-range 15 are connected in series to form a third receiver 18. First, second and third receptors are located in space in such a way that they form the vertices of an equilateral triangle with sides equal basis placement d (.2). The outputs of the first, second and third of devices are connected to the respective inputs on the transmitter of the Cartesian coordinates of the source of radio emission 19.

Device works as follows: the signals from the source of the radio emission taken each antenna, 1, 2 and 3 series is amplified in the respective receivers 4, 5 and 6; are converted into digitized in an analog-to-digital converters 7, 8 and 9. The received digital sequence served on the relevant evaluators of the energy of a signal 10, 11 and 12 representing digital agreed filters. Digital sequence with the release of energy calculators signal 10, 11 and 12 are served on the relevant evaluators of the range of 13, 14 and 15, determining the distance from the source of the radio emission to the appropriate receiver by calculating the ratio of

where IZ E - known value of the energy of a signal of a radio emission source, 's APRM - effective area of a radio antenna, E PRMi - energy signal received i-m radio, corresponding to the maximum response digital matched filter, G 0 - gain antenna of a radio emission source.

Received digital values of the distances from the source of the radio emission to the first R 1 , second R 2 and the third R 3 receivers, 16, 17 and 18 are served on the computer of the Cartesian coordinates of the source of radio emission 19, calculates the location of the source signal the results of these measurements by formulas

The ratio of (1) and (2) show that for the determination of emitters known intensity you need to know gain antenna source of radio emission; the antenna area of each radio receivers and signal energy that is taken by each of the receivers. This, in turn, means that the set of distinctive features is significant, i.e. the device complies with the objectives of the invention consists in that for the determination of emitters in passive mode, don't need mutual timing receivers.

Entered in the rangefinder method of definition of coordinates of emitters according to the measurements in at least three mutually distant points of the reception of radio signals process for determining the intensity of the source signal and calculate the distance from the source of the radio emission to each of the points of largest of these intensities signals are not used in any known ranging ways of positioning. Such a set of distinctive features missing and analogues in the prototype, which proves the compliance of the proposed method criterion of «novelty».

Therefore, when analyzing the level of technology is not detected objects, having the same set of features as the claimed invention, and therefore it is new.

Inventive level of the proposed method and device supported by the fact that in the result of the search is not identified the ways and devices, with signs that match the distinctive features of the invention. All traceable directions of improvement of the ranging system, reflected in scientific and technical literature, associated with the use phase or temporary information on the measuring signals. This means that the claimed invention does not arise obvious from the prior art, and, therefore, has an inventive level.

List of figures and drawings

Figure 1 shows the block diagram of the device definition of the Cartesian coordinates of the source of radio emission, where the numbers mark: 1, 2 and 3 - three spatially separated omnidirectional antenna type a vibrator; 4, 5 and 6 - three radios; 7, 8 and 9, three analog-to-digital Converter; 10, 11 and 12 three transmitter signal energy; 13, 14 and 15 - three transmitter range, 16, 17 and 18 of the first, second and third receptors, respectively, and 19 - calculator coordinates of the source of radio emission.

Figure 2 the drawing of position in space of the first (1), second (2) and the third (3) receptors. Ibid point M identified object of radio emission, the coordinates of which you want to define.

Information supporting the possibility of the invention.

Industrial applicability of the invention defined by the possibility of the realization of its assemblies and units of the state of the art. Consider the possibility of technical implementation on the example of construction of the airfield positioning system aircraft according to the automatic dependent observations-broadcast ADS-B. fitted with ADS-B aircraft transmitting every second over the air its characteristics during the whole way. The exactly known frequency radiation power transmitters and antenna characteristics, located on Board the aircraft.

For an example of the first, second and third receiving devices can be used:

1. Omnidirectional antenna type a vibrator 1, 2 and 3 - Russian antenna company radial (10 dBi). Description: http://adsbradar.ru/content/radial-1065-1134-mhz-antenna-vertikalnava-a10-1090

2. Radio 4, 5 and 6 include preamplifiers signal, in this case it can be low-noise amplifiers on the 1090 MHz company Kuhne electronic KU LNA 1090 (30 dB). Description: http://adsbradar.ru/KU-LNA-1090-A-TM-Super-Low-Noise-Amplifier-for-Avionics. Actually signal amplifiers and frequency converters are built under the dynamic range of the ADC and do not cause technical difficulties.

3. Market analog-to-digital converters (7, 8 and 9) for the application of saturated.

4. Digital implementation calculators energy of a signal (10, 11 and 12), calculators range (13, 14 and 15) and the evaluator of the coordinates of the source of radio radiation (19) can be ensured by microprocessors in accordance with the algorithms given in the description of the invention.

Thus, the claimed invention is industrially applicable. Can be used in all industries that require locating the sources of radiation in space, such as marine ground and air radio navigation, topography, geological prospecting and .. has advantages over known, associated with the lack of necessary time synchronization points of acceptance, which leads to its technical and economic efficiency.

Literature.

1. V.S. Kondratyev, A.F. Kotov, L.N. Markov «multi-station radio systems M: Radio and Communication, 1986, .220-228.

2. Patent №2309420 EN, Application №2006103054/09, 02.02.2006, Military space Academy named A.F. Mozhaisky (EN), Publ. 27.10.2007.

3. Patent №2096800 EN, Reg. application number: 93051121 Main codes IPC: G01S 005/02 Horny V.F.

4. Radar funds for the air defense systems of the 80-ies. - Electronics abroad, 1978, №2.

1. Rangefinder method of definition of coordinates of emitters according to the measurements in at least three mutually distant points of the reception of radio signals, which consists in the fact that at the points of produce definition of distance from the source radio emission from each of the points of reception and received by distances calculated coordinates of emitters, characterized in that in a passive mode in conditions of absence of mutual timing of reception points at the points of measure the intensity of the signal source in the form of the signal energy that is determined by the maximum response matched filter, and then largest intensities signals calculate the distance from the source of the radio emission to each of the points of largest signal attenuation on the track propagation from the source of the radio emission to the point reception.

2. Device for determination of the Cartesian coordinates of the source of radio emission, containing three spatially separated omnidirectional antenna type a vibrator; three radios; three analog-to-digital Converter and calculator coordinates of the source of radio emission, and the output of each omnidirectional antenna is connected to the input of the appropriate radio, and the output of each radio is connected to the input of the corresponding analog-to-digital Converter, and the antenna and the radio and analog-to-digital converters in space in such a way that they form the vertices of an equilateral triangle with sides equal basis placement, wherein the device additionally contains three transmitter signal energy that is made in the form of digital agreed filters, and three transmitter range, the output of analog-to-digital converters radios connected to the inputs of the relevant calculators energy of a signal, and the outputs calculators energy of the signal connected to the inputs of the relevant calculators range, the output of each of calculators range is connected to the corresponding input coordinate calculator the source of the radio emission.

 

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