Aircraft location method

FIELD: physics, navigation.

SUBSTANCE: invention relates to satellite navigation and passive radar. The disclosed method of locating an aircraft is characterised by ground-based stationary navigation receivers receiving direct beams of repeating radio signal transmissions emitted by navigation satellites, from which coordinates of the navigation receivers on the ground are calculated and refined; using a group of spaced-apart navigation receivers with predetermined dislocation coordinates, which transmit information received from navigation satellites to a computer for calculating the coordinates of the aircraft; the aircraft is detected using at least two navigation satellites visible to the receivers and at least two corresponding navigation receivers upon detecting a radio shadow represented by abrupt weakening of the radio signal from the first navigation satellite or complete loss thereof at the corresponding first navigation receiver and simultaneously from the second navigation satellite at the second navigation receiver; wherein the computer records the time of detecting the radio shadow by the first and second navigation receivers, using a preceding radio shadow, the full radio signal respectively from the first and second navigation satellites, containing the accurate universal time of atomic clocks at each navigation satellite, and an accurate range-finding code, which enables to filter out adverse reflected radio signals corresponding to abrupt increase in range for the corresponding navigation satellite and navigation receiver pair; for said recorded time of detecting a radio shadow, coordinates of the first and second navigation satellites are recorded, as well as known constant coordinates of the first and second navigation receivers confirmed by each reception of a radio signal from the navigation satellite; the first and navigation satellites and navigation receivers used can be any of a system of a navigation satellite and a group of navigation receivers; two lines in space are therefore recorded at said moment in time, one of which passes through the obtained coordinates of the first navigation satellite and known coordinates of the first navigation receiver, and the second passes through the obtained coordinates of the second navigation satellite and known coordinates of the second navigation receiver; the coordinates of the point of intersection of said two lines are determined, said coordinates being the coordinates of the detected aircraft at the corresponding detected moment in time; further, coordinates of the aircraft at other moments in time are determined similarly and tracked, thereby forming a path.

EFFECT: broader functional capabilities.

1 dwg

 

The invention relates to the field of satellite navigation and passive radar and can be used for detection and tracking of aircraft.

There is a method of radar aircraft (BC), characterized by the emission of a radar using the included him pulse transmitter of the radar pulse, the receive reflected from BC of the radar pulse through also included in the radar receiver and determining the distance BC from the radar time delay of the reflected radar pulse that is received by a receiver, since the radiation transmitter corresponding radar pulse, as well as directions on BC (Dictionary of Amateur radio. Meters, Energy, 1966, P.464).

The lack of a widely used well-known fashion radar is a relatively high technical complexity (and therefore the cost) of modern radars and radar stations with relatively complex transmitting and receiving devices.

Costs are significantly reduced (approximately 50%), if for BC detection is possible in the procedure of passive radar without the use of a radio transmitter to receive the receiver corresponding to the position of the BC radio signals, for example radio signals of navigation satellites (NS), modified for distribution prevent them BC and represents radio shadow.

The closest to the technical nature of the claimed invention is a Method of reducing the effects of multipath propagation of radio navigation satellites" (application No. 2011121327/07(031563) IPC G01S 19/07 from 27.05.2011, the decision on the grant of a patent), which is characterized by terrestrial stationary receivers of radio signals emitted by the NA on which the calculated location coordinates of the receivers.

There is a method aimed at reducing the effect of multipath propagation of radio signals NA, not intended and does not allow to determine the coordinates of BC.

The technical result and the purpose of the invention is to expand the functional capabilities of the known invention is the provision of a possibility to determine the coordinates of BC by terrestrial stationary GPS receivers (NP) modified by the influence of BC radio signals radiated by the national Assembly.

The technical result and the goal is achieved by the fact that the way locations BC, characterized by terrestrial stationary GPS receivers (TM) direct rays duplicate parcels of radio signals emitted from the national Assembly, which calculate and specify the coordinates of a location on earth NP, and that for detection of BC use the group posted a TM with a pre-defined coordinate dislocate is, transmitting the received accident information in the calculator to calculate the coordinates of BC, and the BC detection is carried out using at least two visible receivers of the national Assembly and at least two corresponding NP at the time of detection and registration of the radio shadow, which represents an abrupt weakening of the signal from the first NA or loss on the corresponding first NP and at the same time from the second national Assembly at the second NP, the computer recorded the time of detection of the radio shadow first and second NP, using the preceding radio shadow full signal from the first and second NA that contain the exact single time atomic clock, located on each of the national Assembly, and accurate ranging code to filter out harmful reflected radio signals, which corresponds to a sharp increase in the range for a respective pair of NS and NP, also register for the registered point-in-time detection of the radio shadow of the coordinates of the first and second NA known and unchanged and reiterate each reception signal from the NA coordinates of the first and second NP as the first and second NA and NP can be any of the systems NA and NP group, therefore, be registered at the above time the two lines in space, one of which passes h is the cut obtained coordinates of the first of the national Assembly and the known coordinates of the first NP, and the second one through the coordinates of the second national Assembly and the known position of the second NP, then determine the coordinates of the point of intersection of these two lines, which are the location coordinates detected BC to the appropriate registered time, then similarly determine the coordinates of BC for other points in time and accompany them, forming the appropriate route.

In Fig.1 shows a sketch illustrating the principle of operation of this method.

In Fig.1 shows a system 1 NS 1.1, 1.2, 1.24..., group 2 NP 2.1, 2.2, 2.3 ... the first 3 direct linking NA 1.1 and NP 2.1, the second straight 4 connecting NS 1.2 NP 2.2, point 5 finding BC1, point 6 finding BC2 and third straight 7 connecting the NA 1.2 and NP 2.3.

The way the location of the aircraft (BC) 5, characterized by the reception of terrestrial stationary GPS receivers (TM) 2 direct rays 3 and 4 duplicate parcels of radio signals emitted by the navigation satellites (NS) 1, which calculate and specify the coordinates of a location on earth NP, while for the detection of BC 5 use group 2 posted NP 2.1, 2.2 predefined coordinate deployment of transmission received from NS 1.1, 1.2 information on the calculator to calculate the coordinates of BC 5, moreover, the detection of BC 5 is carried out using at least two visible receivers NS 1.1 and 1.2 not less than on the ear corresponding NP 2.1 and 2.2 at the time of detection and registration of the radio shadow, representing abrupt attenuation of the radio signal from the first NA 1.1 or loss on the corresponding first NP 2.1 and simultaneously from the second NA 1.2 on the second NP 2.2, the computer recorded the time of detection of the radio shadow first and second NP 2.1 and 2.2, using the preceding radio shadow full signal from the first and second NA 1.1 and 1.2 contain the exact single time atomic clocks located at each NS 1.11.2, and accurate ranging code to filter out harmful reflected radio signals, which corresponds to a sharp increase in the range for a respective pair of NS and NP, also register for the registered point-in-time detection of the radio shadow of the coordinates of the first and second NA 1.1 and 1.2 and famous unchanged and reiterate each reception signal from the NA coordinates of the first and second NP 2.1 and 2.2, as the first and second NA and NP can be any of the system 1 NS and group 2 NP, thus, are registered at the above time the two lines 3 and 4 in space, one of which passes through the coordinates of the first NA 1.1 and the known coordinates of the first NP 2.1, and the second one received the coordinates of the second NS 1.2 and the known position of the second NP 2.2, then determine the coordinates of the point ruggedness, demand of the Oia these two straight 3 and 4, which is the coordinate of the detected BC 5 corresponding to the registered time, then similarly determine the coordinates of BC for other points in time and accompany them, forming the appropriate route.

The method is as follows.

The method can use any of the existing navigation systems (GPS, GALILEO or GLONASS or any combination. Simultaneous use of all navigation systems increases the reliability of the method. For simplicity, let's only use of the Russian global navigation satellite system (GLONASS) NS 1.1, 1.2, 1.24..., each of which with a height of about 20 thousand km radiates towards the earth, together covering the entire globe, periodic radio signals at its carrier frequency. In each such radiomobile among other extensive data contains the exact time of radiation radiopacity, the exact position of the national Assembly at the time of radiation radiopacity and the ranging code, allowing any point on the earth any NP to determine its location.

Let also used group 2 NP 2.1, 2.2, 2.3, ... with such sensitivity, in such quantity and so placed that the emergence of BC over a given surface, for example, on a particular object, the city or on any line, for example, on the boundary of g is the state led to the reception of the radio shadow from BC not less than two NP, and from no less than two different NA.

Then when BC1 in the above field at point 5 (Fig.1) will the perception of the receiver NP 2.1 radio shadow (leap attenuation of the radio signal from the NA 1.1 or disappearance), which passes on the computers of the time value of radiation NA 1.1 respective radiopacity and coordinates in space, the satellite received by the specified receiver. These data are associated and registered in the memory of computers. Similarly, in the same moment of time (or a valid approximate time that is easily identified by the special processor) receiver NP 2.2 perceives radiating from BC1 when receiving a signal from the NA 1.2 and sends the appropriate data to register in computers.

The coordinates of the position in space BC1 in the registered time is defined as the intersection point of two straight lines, connecting the two pairs of NS 1.1 - NP 2.1 and NA 1.2 - NP 2.2. For a rectangular coordinate system (in any other coordinate system can easily be formal conversion) for a given point in time the location of the BC-1 determine desired values of X, Y, Z. thus for a given point in time, the initial known values for the first direct coordinates NA 1.1 and NP 2.1, respectively, will be X1, Y1, Z1 and X2, Y2, Z2, and for the second straight coordinates NA 1.2 and NP 2.2 ratio is estwenno will be X3, Y3, Z3, X4, Y4, Z4.

Then, in accordance with analytical geometry in space (M. A. Profitable "Handbook of higher mathematics, Moscow, State publishing house of physical and mathematical literature, sixth edition, page 185) equations of the first and second direct will be, respectively:

X-X1 X2-X1=Y-Y1:Y2-Y1=Z-Z1:Z2-Z1 and

X-X3:X4-X3=Y-Y3:Y4-Y3=Z-Z3:Z4-Z3, where elementary substitutions determine the desired values of X, Y and Z.

The perception of the radio shadow from BC1 third, and so on, the receivers are used to Refine the detection of BC1. In the presence in a controlled space of the second BC2 (Fig.1, point 6) its coordinates are defined similarly using equations 3 and the first direct third straight 7. For BC3, etc. carry out similar calculations.

For each BC found in the subsequent moments of time similarly define their changing coordinates, shape their tracks and provide their support.

The way the location of an aircraft (AC), which is characterized by terrestrial stationary GPS receivers (TM) direct rays duplicate parcels of radio signals emitted by the navigation satellites (NS), which calculate and specify the coordinates of a location on earth NP, characterized in that for the detection of aircraft, use the group posted a TM with a pre-defined coordinate location, transmitting the floor is obtained from the NA information on the calculator to calculate the coordinates of the aircraft, moreover, the detection of aircraft is carried out using at least two visible receivers of the national Assembly and at least two corresponding NP at the time of detection and registration of the radio shadow, which represents an abrupt weakening of the signal from the first NA or loss on the corresponding first NP and at the same time from the second national Assembly at the second NP, the computer recorded the time of detection of the radio shadow first and second NP, using the preceding radio shadow full signal from the first and second NA that contain the exact single time atomic clocks located at each of the national Assembly, and accurate ranging code, allows you to filter out harmful reflected radio signals, which corresponds to a sharp increase in the range for a respective pair of NS and NP, also register for the registered point-in-time detection of the radio shadow of the coordinates of the first and second NA known and unchanged and reiterate each reception signal from the NA coordinates of the first and second NP as the first and second NA and NP can be any of the systems NA and NP group, therefore, be registered at the above time the two lines in space, one of which passes through the coordinates of the first of the national Assembly and the known coordinates of the first NP, while the WTO is th - through the obtained coordinates of the second national Assembly and the known position of the second NP, then determine the coordinates of the point of intersection of these two lines, which are the location coordinates of the detected AC corresponding to the registered time, then similarly define the coordinates for aircraft other moments of time and accompany them, forming the corresponding track.



 

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