Method for evaluation of accuracy in detection of radio-wave radiation source location by passive range-difference system

FIELD: physics, measurement.

SUBSTANCE: invention is related to the field of passive radio location and is intended for performance of full-scale tests of pilot samples of passive range-difference system (RDS) in case of absence of one of receiving posts. Substance of suggested method consists in the fact that mutual-correlation measurement of RRS signals time delays received by master and slave receiving posts, and missing slave receiving post is additionally imitated by definition of its location coordinates, which is symmetrical to location of slave receiving post relative to the line "master receiving post - RRS", and as RRS signal received by imitated slave receiving post, signal is used from existing slave receiving post, and then RRS location is defined by full-scale test method.

EFFECT: provides for possibility to evaluate accuracy in detection of radio-wave radiation source (RRS) location by passive RDS in case of one receiving posts in not available in its composition.

2 dwg

 

The invention relates to the field of passive radar, and is intended for field tests of prototypes passive differential-ranging system (RDS) in the absence in it of one of the receiving stations.

Prototypes of equipment coming on advanced, state, interagency testing can do is not complete, and contain separate components (GOST RV 15.210-2001, Military equipment. Tests of prototypes of products and experienced repair items. The main provisions, Gosstandart of Russia, M., 2001).

There is a method of evaluating the accuracy of determining the location of Iran's passive RDS, including mutual-correlation measurement of time delays of the signal IRI received the master and the slave receiving posts, statistical processing of results of measurements and evaluation of location accuracy of the IRI by the formula ("Radio system"./ Edited Umetalieva. M.: Vysshaya SHKOLA, 1990, str-240)

where σr- the standard error of measurement location IRI;

C is the speed of radio wave propagation;

στ- the standard error of measurement of time delays of the signal IRI;

φ is the angle of intersection of lines of position (hyperbole);

ψ1, ψ2 - base angles of the first and second the art of receiving posts.

This method is implemented using a simulation mathematical modeling. In the base simulation mathematical modeling is the replacement of a real physical system, its approximate representation of the algorithm and associated software that plays on the computer of the interesting aspects of the functioning of the original system (Vterezia.we, Art. "Information support of electronic systems in conditions of conflict." IBRIR, M., 2001, p.66-87).

The method is experimental-theoretical and disadvantages before full-scale test. A real physical system, the paths, the signals do not participate in the test specifications which affect the accuracy of location. For example, the second channel correlator, computing device, path propagation r14, r24etc.

The method requires the development of additional measurement equipment for each test sample.

Closest to the proposed method to the technical essence and achieved a positive result is a method of evaluating the accuracy of determining the location of Iran's passive RDS with three receiving positions, including mutual-correlation measurement of time delays of the signal, Iran received two pairs of receiving stations, one of which leading to the, and on the known coordinates of the receiving stations to determine the location of the IRI. (Theoretical fundamentals of radar./ Edited Aderman. The owls. radio, M, 1970, str-497).

This method does not determine the location of Iran in the absence of one of the receiving stations, which is typical during the pre-state and inter-Agency tests.

The technical result - ensuring assess the accuracy of the positioning of the emitters passive RDS in the absence in it of one of the receiving stations.

The technical result is achieved by the known method of evaluating the accuracy of determining the location of Iran's passive RDS, including mutual-correlation measurement of time delays of the signal IRI adopted the master and the slave receiving posts, and additionally mimic the missing slave receiving the post, which define the coordinates of its location, which is symmetrical to the location of the slave receiving the post relative to the line leading to receiving post - IRI", and the signal quality in Iran, accepted the simulated slave receiver post, use the signal from the current slave receiving the post, and then evaluate the accuracy of location of the IRI.

The analysis of the prior art reveals that technical solutions characterized by sookun the STU signs, identical to all characteristics contained in proposed by the applicant claims to be missing, that indicates compliance of the claimed invention to the eligibility criterion of "novelty".

Search results known solutions in this and related areas of technology, with the purpose of revealing of signs consistent with the distinctive features of the proposed device, showed that public sources are not identified solutions that have the signs consistent with its distinguishing characteristics. The prior art also has not been confirmed by the known influence of the distinctive features of the invention specified by the applicant, the technical result. Therefore, the claimed invention meets the condition of "inventive step".

The proposed solution is industrially applicable as a set of characterizing characteristics provides the possibility of its existence, efficiency and reproducibility, so as to implement the proposed technical solution can be used known materials and equipment.

Figure 1 shows the scheme of the mutual placement of elements RDS, necessary to assess the accuracy of the location of the IRI.

Figure 2 shows the structural diagram of the device RDS implementing the claimed method, where 1 - Iran; 2 - senior reception of the first post; 3 - the slave receiving the post; 4 - simulated receiving post; 5 - channel correlator; 6 - computing device. The dashed line shows the missing elements, lines of communication devices, thick line - advanced communication actions that implement the method.

Implementation of the method contains the calculation of the coordinates of the simulated slave receiving post 4 and entered into the computing device 5.

The coordinates of the simulated slave receiving post 4 (x4, y4determine from the condition of symmetry for the location of the current slave receiving post 4 relative to the line leading to receiving post - IRI" (figure 1):

where r24, r23- the distance between the receiving stations (base) system;

r14, r13- the distance from the corresponding slave receiving posts to Iran;

(x2, y2), (x3, y3), (x4, y4) - rectangular coordinates of the respective receiving positions;

(x1, y1) rectangular coordinates Iran.

The system of equations (2) has a positive solution regarding x4,4:

The calculated coordinates of the simulated slave receiving post 4 (x4, y4) injected into the computing device 6.

Mutual-correlation measurement of time delays of the signal IRI 1, taken the lead 2 and slave 3 and 4 receiving positions in the device RDS, is solved by finding the time difference between the signals in two-channel correlator, in which the correlation functions take the maximum value

where τ is a function of the time shift is introduced in one of the signals;

T is the integration time.

As signal IRI 1 adopted by simulating the slave receiver post 4, the method uses a signal IRI 1 from the current receiving post S(t-τ4)=S(t-τ3). Practically this action is implemented by using an additional connection of the output current of the slave post 3 to the input of the second channel correlator 5. Equality delay signal IRI 1 in two channels of the correlator 5 (τ42)=(τ32) corresponds in location to the two symmetrical branches of hyperbole regarding the host receiving the post 2, and the point of their intersection determines the location of the IRI 1 (x1,1).

From the symmetry conditions of the locations of the slave receiving posts 3, 4 the point of intersection of the hyperbola branches will lie on the line of symmetry (figure 1).

During testing, the location of the IRI 1 pick on the line of symmetry and the coordinates (x1,1)' pre-determine with a high degree of accuracy, for example by using the satellite the new navigation system.

With the help of the device RDS measured coordinates IRI 1 (x1, y1and compare with the pre-defined (x1,1)', and then determine the accuracy characteristics RDS.

From the expression (1) when ψ1=ψ2=ψ, standard error of measurement location IRI will be

Changing the location of Iran, define the boundaries of the working area RDS, σrσr0,where σr0the maximum RMS error of measurement location Erie, which makes sense operation RDS.

Thus, the proposed method allows in-situ method to assess the accuracy of the positioning of the IRI to conduct tests of a prototype passive RDS in the absence in it of one of the receiving stations.

A method of evaluating the accuracy of the positioning of the emitters passive differential-ranging system including a leading and a valid slave reception positions, characterized in that simulate additional slave reception post by defining the coordinates of the symmetry conditions for the location of the current slave receiving the post relative to the line leading to receiving post - emitters", as signal emitters adopted emitir is subject to slave receiver post, use the signal from the current slave receiving station, and with the accuracy of the positioning of the emitters are estimated by mutually-correlation measurement of time delays of signal emitters taken a leading force slave and simulated slave receiving posts passive differential-ranging system, and the equality of the delay signal, the received current slave and simulated slave receiving posts, corresponds in location to the two symmetrical branches of hyperbole regarding the host receiving the post, and the point of their intersection determines the location of the emitters.



 

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