The method of detection of group objects
(57) Abstract:The invention relates to the field of radar and can be used in radar stations for air traffic control, airspace control. The basis of the invention is the technical task of discovering not resolved group of objects, separated by angular coordinates, which is achievable technical result. The solution is based on the use of properties, namely, that different methods of direction finding group not resolved objects give different bearings. For this purpose, the method of detection not resolved group of objects, based on direction finding, bearing carried out simultaneously in two or more ways and decide there is no unsettled group of objects, if the scatter of the obtained values of the bearing exceeds a threshold. The direction finding is performed using single-channel and q-switched methods. For this purpose, the bearing is determined by the direction of reception of radiation of airborne radio-electronic means and using single-channel or more, and monopulse methods. 2 C.p. f-crystals. The invention relates to about the of ntrolle airspace.In the process of management and control requires knowledge of the exact coordinates of all objects in space, to resolve objects separated by angular coordinates 1-2oto detect (recognize) group objects in the event are unable to resolve them.Resolution on the angular coordinates provide through the use of proper antenna sizes, since the resolution is determined by the width of the beam, a BOTTOM, which in turn is proportional to /d ( - wavelength radars; d is the linear dimension of the aperture of the antenna).The disadvantage of this method is that in the long wavelength range when the actual values of d it is impossible to provide the above resolution. In this case, the task is: at least detect the presence of the group object, and then may be called short-wave radar to resolve objects within a group (Patent N 2126543). Discover a group object on the basis of its finding.There are various ways of finding, for example, the direction finding of radio signals on-Board radio-electronic means of the object (the Reference radar, edited by M. of SKOLNIK, M., "Sov. radio", 1978, T. 4, S. 206). The fact of obtaining from b the detection of group object. The disadvantage of this method consist in the fact that groups of objects can emit only one object. For example, when paired object and the presence of radiation of only one of them has one bearing to the radiating object.Known single-way direction-finding object by measuring the angular position of the center of the package of the reflected signals (Theoretical fundamentals of radar, edited by J. D. Shirman, M., "Sov. radio", 1970, S. 274). The disadvantage of this method is that using this method will identify the coordinates of the center of the total package of the reflected signals from a group of objects, including these coordinates may correspond to a false position of the object. For example, when paired not resolved object, this method provides a bearing between objects (with equal power reflected signals). The most commonly used technical solution is the monopulse method of direction finding, in particular, based on the reception signals with the total pattern (CF) and differential (DN), on the comparison of the amplitudes of the received signals and determining pelengovogo direction (ibid., 301 S., 5.18, and A. I. Leonov, K. I. Fomichev. Monopulse radar, M, Radio and communications, 1984, S. 70-71, III). Largest detect the S. 302, 1st para. above), if it is zero, the direction DNcorresponds to the bearing.The disadvantage of this method is that it is not applicable for measurements if not resolved group of objects, separated by angular coordinates, because in this case there will be distortion of the phase front of the wave incident on the antenna, and the method may give false bearings.Let us consider this in more detail.1. The differential signal channel U0.There are three possible cases:
a) detected single object, DNrejected from bearing him;
b) has not resolved the group object, the direction DNnot the same as bearing any of the objects;
C) detected no unsettled group object, the direction DNcoincides with the bearing on one of the objects.2. U= 0
There are two cases:
a) detected a single object, the direction DNcoincides with the bearing;
b) has not resolved the group object, the direction DNnot the same no bearing on one of the objects (method gives "false" Peleng).From an analysis of these cases shows that when using the sum-dierence method elangovan is for finding a single object. Thus, the disadvantage of the considered methods of direction finding is that group objects, they can give a false bearing, the position of which depends on the composition of the group of objects and properties specific method of direction finding. It follows that the bearings on the group object, obtained in various ways, as a rule, do not match.The claimed invention is directed to the solution of the following problem: finding not resolved group of objects, separated by angular coordinates.This problem is solved based on the use of properties, namely, that different methods of direction finding group not resolved objects give different bearings.This result is achieved in that in the method of detection is not resolved group of objects, based on direction finding, according to the invention the bearing takes place simultaneously in two or more ways and decide there is no unsettled objects, if the scatter of the obtained values of the bearing exceeds the threshold value.The fact that the direction finding is performed using single-channel and q-switched methods.The fact that the bearing is determined by e.g. the aqueous ways.The essence of the invention consists in the following. When browsing space and the detection of, for example, two identical and no unsettled objects single-channel method provides a bearing between objects, and bearing the radiation on one of the objects. The values of the bearings will differ by an amount equal to half of the angular spacing of the objects that will be detected when comparing their values. If you have three objects, receiving radiation from the middle of the object and the symmetric position with respect to it two other possible sign of a group object. To reduce the probability of missing can be used additionally and monopulse method of direction finding. 1. Method detection not resolved group of objects, based on the bearing, wherein the bearing takes place simultaneously in two or more ways and decide there is no unsettled group of objects, if the scatter of the obtained values of the bearing exceeds the threshold value.2. The method according to p. 1, characterized in that the direction finding is performed using single-channel and q-switched methods.3. The method according to p. 1, characterized in that the bearing is determined by the direction of the reception radiation Board is
FIELD: electromagnetic reconnaissance.
SUBSTANCE: direction finder can be used for founding line of location of radio-frequency radiation sources. Observation of area in direction finder is performed due to movement of platform provided with aerial system fixed onto the platform. Axis of aerial system is oriented in perpendicular to movement of platform. Direction finder finds moment of time when the source is disposed at traverse of platform. To find that moment of time, which directly characterizes line of location of source, the aerial system two-step correlation output signal processing is used - first, in aerial correlator and then in multichannel trajectory correlator.
EFFECT: improved precision of finding of position.
FIELD: radar systems, in particular, angle-measuring two-position passive radar systems.
SUBSTANCE: the problem of identification of bearings of radio sources in the claimed method is solved as follows: on the basis of the values of bearings of radio sources measured in each of two receiving positions and own co-ordinates of the receiving positions the altitudes of the radio source with respect to each receiving position are found, then the difference of these altitudes is found. On the basis of dispersions of the errors of determination of the bearings of the radio sources in each receiving position the value of the identification threshold is determined. By the results of comparison of the mentioned difference of altitudes with the identification threshold a decision is taken on belonging of the bearings, measured by different receiving positions, to one radio source.
EFFECT: expanded potentialities of passive radar observation, since it becomes possible to identify the bearings of several radio sources even if they are in the same plane.
FIELD: radar detecting systems.
SUBSTANCE: method can be used for evaluation of parameters of parameters of movable radio-frequency radiation sources (RFRS). Angular coordinates of RFRS and coordinates of receiving positions (RP) and coordinates of RFRS are calculated in rectangular coordinate system. To estimate coordinates and projections of speed vectors of RFRS at axis of rectangular coordinate system the adaptive algorithms of α,β-filtration of results of generalized metering are used. Adaptation has to be the selection of values of gain factor in algorithms of filtration dependent on meanings of current errors of generalized metering provided by mutual movement of RP and RFSR. Filters can be reorganized easily by changing only two factors of amplification. Parameters of motion of RFRS can be estimated with specified level of estimation level; the errors do not depend on position of RFRS relatively RP.
EFFECT: improved precision.
2 dwg, 1 app
FIELD: physics; radiolocation.
SUBSTANCE: certain bistatic antireflective radar designed as spaced coupling point comprising series-connected transmitter and transmitting antenna and receiving station comprising series-connected receiving antenna and multiradiation pattern, receiver and operator working place (OWP), at that transmitting and receiving antennas are raised to the point ensuring direct line-of-sight and back-to-back directed, monostatic radar is mounted at receiving station with detection zone blocking detection zone of bistatic antireflective radar, and input-output of monostatic radar is connected to input-output of OWP, input of which is to be output of radar.
EFFECT: elimination of dead zone within detection zone of bistatic antireflective radar.
SUBSTANCE: transmitting ground position forms N partial beams at frequencies which differ from each other by a value greater than the maximum value of the Doppler frequency of the signal reflected from the target. One "wide" beam, forward signals of partial beams and signals reflected from the target are formed at the receiving position and then filtered, each in its own channel in accordance with the frequency of the emitted partial beams. The Doppler frequency of the received signals is determined. The direction of arrival of a signal from the transmitting position to the target is then determined using a mono-pulse method from the ratio of the amplitude of signals in receiving partial channels at the same reduced Doppler frequency in accordance with the direction-finding characteristic of the transmitting antenna. The device which realises the method consists of a ground transmitting position comprising a transmitter and a transmitting antenna, and a receiving position on a mother space vehicle and consisting of a receiving antenna, N band-pass filters, N receivers, N devices for rejecting the forward signal of the transmitter and clutter, N units for determining Doppler frequency, a unit for determining bearing, all connected in a certain way.
EFFECT: unambiguous and accurate determination of angular coordinates of a target.
2 cl, 3 dwg
FIELD: radio engineering.
SUBSTANCE: system includes device containing antenna and reflector with known location close to antenna, which transmits at least electromagnetic pulse having the frequency of carrier signal; at that, device receives the reflected signal during the time period; at that, reflected signal includes the pulse reflected from the object within the limits of area of radar detection of the device and at least one pulse of multi-beam transmission. Device processes the reflected signal in order to distinguish the reflected pulse and at least one pulse of multi-beam transmission from reflected signal. Device determines the distance from the device to the object and location of the device relative to the object. Distance is determined in compliance with the time of reception of the reflected pulse, and location is determined in compliance with the time of reception at least of one pulse.
EFFECT: improving determination accuracy of location.
24 cl, 10 dwg
SUBSTANCE: method of striking a target producing coherent interference by launching and guiding missiles fitted with an active radar seeker involves emitting a probe signal and receiving the signal reflected by the target, wherein two missiles are simultaneously directed onto the target, and emission of the probe signal and reception of the signal reflected by the target are reassigned between the missiles alternately; before launching missiles, the intervals for emitting probe signals and receiving reflected signals are synchronised such that intervals for emitting the signal of one missile match intervals for receiving the signal reflected from the target of the other missile. Switching intervals for emitting the signal and receiving the reflected signal is carried out with frequency higher than the bandwidth of the guidance system, and the frequency of switching emission and reception intervals is set primarily alternating. The missiles are guided into the target on "pliers" type maximally divergent trajectories.
EFFECT: improved method.
4 cl, 2 dwg
SUBSTANCE: space radio telescopes (RT) are placed in orbits with radii of up to 300 billion kilometres from the Sun and with different inclinations to ecliptic plane. Said RTs and ground RTs are grouped to make at least one radio interferometer with superlong base (SLBR) to seek for planets with lightning-active atmospheres. System of RTs incorporated with one SLBR is directed to the planet selected for analysis to receive electromagnetic radiation from lightning discharge in synchronism and with referencing to universal time system, particularly, electromagnetic radiation reflected from the planet underlying surface in the area of every discharge. Accumulated data from all RTs are transmitted by commands from surface control station to ground reception stations. Standard correlation process is used to process obtained data array and to construct the underlying surface images in the area of every lightning discharge. Multiple maps of local surface areas are combined to construct the surface map of the entire planet.
EFFECT: possibility to analyse the planets orbiting nearby stars located some 2000 light years from the Sun.
FIELD: radio engineering and communications.
SUBSTANCE: invention can be used in navigation and meteorological systems. Said result is achieved by the fact that the device contains thunder-storm finding device, indicator, the device consists of two individual thunder-storm measuring units and contains a variable delay line, two retainers of duration of the front part of signal, unit for determining time mismatch between two signals and read-only memory. Listed components are connected to each other in a certain manner.
EFFECT: reduced dimensions while preserving accuracy characteristics.
1 cl, 3 dwg