The method of determining the horizontal range goals for emission scanning radar
(57) Abstract:The invention relates to radar. The scope of the invention can be ground radar mode passive detection and measurement of coordinates of the non-emitting targets. The technical result is an increase in accuracy of measuring the distance vsevyshnii air targets. The invention consists in that the height of the goal, in addition to the angle-scanning radar, the angle at the receiving position and the time delay of the reflected signal relative to the direct, additionally measured target position angle relative to the receiving position. 2 Il. The invention relates to the field of radar and can be used in terrestrial radio-mode passive detection and measurement of coordinates of the non-emitting targets.There is a method for passive determination of the range of destination using the signal search radar (L. B. Brant. Handbook on methods for jamming and anti-jamming systems with radar control, 1987).The essence of the method consists in the following. The radar station with known coordinates carries a circular scanning a narrow beam in the horizontal plane. At the receiving position definition is the time tthe passage of the beam of the radar station between the target and the receiving position:
< / BR>where T is the period of rotation of the antenna. Measure the difference between the distances radar - target - receiving position and radar - receiving position on the delay of the reflected signal relative to the direct. Using theorem of cosines to determine the range of targets R.The disadvantage of this method lies in the fact that should be known coordinates of the station.There is a method of determining the location of the radar, emitting radio pulses from a scanning antenna (patent EPO N 0342529, MKI 4 G 01 S 13/02, 13/87. The method of determining the location of the emitter signals).First, in the receiving position memorize the coordinates of several within direct visibility of points on the ground. Then measure the time delay of signals reflected from these points, since the reception of the pulse radiated radar. On the basis of the measured time lags calculate the probable location of the radar station and the corresponding reflected signals. The reflected signals are compared with stored data points on the ground.The disadvantage of this method is that defines the location of the only targets with radar.The source of the radio emits pulses using a scanning directional antenna. The pulses are encoded in accordance with the current angles of azimuth and location of the antenna. Reception position by using a directional antenna detects the azimuth of the detected target and decodes the angles of azimuth and location of the radiating antenna from the received reflected electromagnetic pulses. On the measured angles and the known location of the source of radio signals determine target coordinates.The disadvantage of this method is the necessity of knowledge at the receiving position of the code used by the source radio, and its location.As the prototype is set to the method described in (Munich A., Schecker E. Bistatic System Passively Tracks Radar Targets. Microwaves &RF. - 1991. - 30, N 9, P. 78-79, 82-83).The essence of the method is that at the receiving position (PFP) measure the angle , equal to the difference of the azimuths goals and PFP relative to the radar at the time of passage of the beam of the radar station between the target and PFP, angle , equal to the difference between the azimuth of the radar and the targets related to PFP using a directional antenna PFP and the difference between the distances radar - target - PFP and radar - PFP delay of the reflected signal Rel is of range-finding is the occurrence of errors in the event that if the target, the radar and the reception position does not lie in the horizontal plane. For the case of terrestrial location of the radar station and the receiving position more than the height of the goal, the greater the measurement error range.The technical result of the proposed method is to improve the accuracy of measuring the distance vsevyshnii air targets.The essence of the proposed method of determining the distance of the goal is that measure the difference between the azimuths PFP and objectives relative to the radar, the difference between the azimuth of the radar and the targets relative to the PFP, the difference between the distances radar - target - PFP and radar - PFP, as well as target position angle by using a directional antenna PFP, the horizontal range of the target is determined by the formula:
where the difference between the azimuths PFP and objectives relative to the radar;
the difference between the azimuth of the radar and the targets related to PFP;
- difference radar - target - PFP and radar - PFP;
- target position angle relative to the PFP.The essence of the method is illustrated by the following reasoning. Let the origin of the coordinate system aligned with the PFP, the OY axis directed through the radar, a OZ - straight up (Fig. 1). The values , , and are related to the coordinates of the radar and target as follows:
< / BR>< / BR>< / BR>< / BR>Express through the corners and sought-after transformations, we obtain the expression (2). In the particular case when the target lies in a horizontal plane = 0), we arrive at the formula (1).In Fig. 2 presents a diagram of the device for the implementation of the proposed method. It consists of the main antenna 1, antenna 2 meter 3 meter 4, myCitadel 5 and the computer 6. The method is implemented as follows. Highly directional beam of the main antenna 1 is directed at the target. Echo signals are received in the probe 3 and probe 4. The additional antenna 2 is directed to the emitting radar. Direct signals in the probe 3 and probe 4. In the measuring device 4 is determined by the difference in the delay of the echo relative to the direct. In the measuring device 3 is determined by the time interval between the moment of reception packs of echoes and the tutus direct pulses with known rotation period of the radar antenna, which can be measured in advance. In myCitadel 5 angle is calculated by finding the difference between the azimuths of the main antenna 1 and antenna 2. In the computer 6 receives values, , ,, and target position angle from the main antenna 1. The transmitter is determined by the horizontal distance goal R by the formula (2).Thus, this method allows for more accurate the first cast out the radiation scanning radar, namely, that measure the difference between the azimuth of the receiving position and the target relative to the radar, the difference between the azimuth of the radar and the targets relative to the receiving position, the distance difference STGS - target - receiving position and radar - receiving position, wherein the measured target position angle by using a directional antenna receiving position, the horizontal range of the target is determined by the formula
< / BR>where the difference between the azimuths of the receiving position and the target relative to the radar;
the difference between the azimuth of the radar and the targets relative to the receiving position;
l - difference radar - target - receiving position and radar - receiving position;
- target position angle relative to the receiving position.
FIELD: radar engineering and cellular communication systems for locating mobile stations.
SUBSTANCE: proposed method is distinguished from prior art in saving satellite measurement results incorporating abnormal errors and reducing weight of these erroneous measurements followed by repeated searching for subscriber's mobile station location using corrected weighting coefficient. This operation is executed until sum of weighed error measures corresponding to corrected location of subscriber's mobile station using refined weighting coefficients reduces below threshold value. Corrected estimate of subscriber's mobile station location obtained in this way is assumed as final estimate of subscriber's mobile station location.
EFFECT: enhanced precision and reliability of locating subscriber's mobile station.
3 cl, 5 dwg
FIELD: radio engineering, applicable for determination of the bearing and frequency of the source of radio signals in the systems of automatic detection of radio emissions.
SUBSTANCE: the method is based on reception of the signal of the source of radio emission by two antennas, whose focal axes are shifted relative to each other approximately by the width of the directional pattern, measurement of the frequency and amplitudes of the received signals and approximate estimation of the bearing of the radio signal by comparison of the amplitudes of the signals received by the antennas, the centers of aperture of the antennas are spaced at a distance exceeding the wavelength of the signal under inspection, approximate estimation of the bearing of the radio signal source is effected by subtraction of the ratio of the difference of the amplitudes of the signals received by the antennas to their sum simultaneously with measurement of the frequency and amplitudes of the signals received by the antennas, the phase shift between them is measured, several values of the bearing of the source of radio signals are calculated according to the measured difference of phases, they are compared with their approximate estimation of the bearing, the value of the bearing is selected from those calculated according to the difference of the phases, the closest to that determined by the ratio of the difference of the amplitudes to their sums, and taken as a bearing to the source of radio signal.
EFFECT: enhanced efficiency of direction finding and simplified realization due to the reduced number of antennas and receiving channels.
FIELD: radio engineering.
SUBSTANCE: method can be used for systems for finding of location of radio signal radiation sources. Method includes receiving of radio signal by means of three non-directional aerials which form ring-shaped equidistant mesh, measuring phase difference among signals from aerials for all the bases formed by reference and other aerials of mesh and finding of primary estimation of direction finding to the source taking those phase differences into account. Aerial signals are additionally and simultaneously conversed into sum-difference signals due to subtraction of reference aerial signal from signals of other aerials. Then signal differences received are added in the first channel and subtracted in the other one and complex amplitude of sum-difference signals Sm are measured. Amplitudes are conversed in the neighborhood of primary estimation of direction finding θ^ into complex angular spectrum of , where m=1, 2 is number of sum-difference channel, θ is possible values of direction finding to source of θ^-π/2<θ<θ^+π/2, D· 1(θ)= cos (√3πR/λ·sinθ)-exp(i3πR/λ·cosθ), D· 2(θ)= isin(√3πR/λ·sinθ)are directional patterns of sum-difference channels, λ is radiation wavelength, R is radius of mesh. Direction finding is estimated from location of maximum of complex angular spectrum module. Location of maximum of complex angular spectrum module is estimated relatively primary estimation of direction finding by introducing correction in form of relation of first and second derivatives, V(θ^)' and V(θ^)'' correspondingly, of module of complex angular spectrum for direction finding in point of its primary estimation of ▵θ= V(θ^)'/V(θ^)''. Values of first and second derivatives V(θ^)' and V(θ^)'' of module of complex angular spectrum are determined from values of complex angular spectrum in close neighborhood of primary estimation of direction finding V(θ^)'=(V(θ^+δ)-V(θ^-δ))/2δ, V(θ^)''= =(V(θ^+δ)-V(θ^-δ-2V(θ^))/δ², where δ is differentiation constant.
EFFECT: improved precision of direction finding.
3 cl, 5 dwg
FIELD: radio engineering, applicable for location of posthorizon objects by radiations of their radars, for example, of naval formations of battle ships with operating navigational radars with the aid of coastal stationary or mobile passive radars.
SUBSTANCE: the method consists in detection of radiations and measurement of the bearings (azimuths) with the use of minimum two spaced apart passive radars, and calculation of the coordinates of the sources of r.f. radiations by the triangulation method, determination of location is performed in three stages, in the first stage the posthorizon objects are searched and detected by the radiation of their radars at each passive radar, the radio engineering and time parameters of radar radiations are measured, the detected radars with posthorizon objects are identified by the radio engineering parameters of radiations and bearing, and continuous tracking of these objects is proceeded, the information on the objects located within the radio horizon obtained from each passive radar is eliminated, the working sector of angles is specified for guidance and tracking of the selected posthorizon object, in the second stage continuous tracking of one posthorizon object is performed at least by two passive radars, and the time of reception of each radar pulse of this object is fixed, in the third stage the period of scanning of this radar, the difference of the angles of radiation by the main radar beam of each passive radar and the range to the posthorizon object with due account made for the difference of the angles of radiation are determined by the bearings (azimuths) measured by the passive radar and the times of reception of each pulse of the tracked radar. The method is realized with the aid at least of two spaced apart passive radars, each of them has aerials of the channel of compensation of side and phone lobes, a narrow-band reflector-type aerial, series-connected noiseless radio-frequency amplifier, multichannel receiving device, device of primary information processing and measurement of carrier frequency, amplitude and time of reception of signals of the detected radar, device of static processing of information and measurement of the bearing, repetition period, duration of the train and repetition of the pulse trains and a device for calculation of the difference of the angle of radiation of the aerials of the passive radars by the detected radar.
EFFECT: reduced error of measurement of the coordinates of posthorizon sources of radio-frequency radiations.
3 cl, 5 dwg
FIELD: the invention refers to radiolocation and may be used in radio navigation, meteorology, geodesy.
SUBSTANCE: the declared arrangement allows determine the parameters of curvilinear trajectories on goniometrical data of a stationary direction finder and the initial distance to an object and this is an achievable technical result. The arrangement has a bearing forming block, an amplifiers block, a buffer storage device, a block of solving the system of linear algebraic equations, an evaluation block, a block of estimations of parameters of movement, a reflection arrangement, a synchronizer, a block of forming basic functions.
EFFECT: determines the parameters of curvilinear trajectories.
FIELD: the invention refers to radiolocation and may be used in radio navigation, meteorology and geodesy.
SUBSTANCE: the declared arrangement allows determine the parameters of curvilinear trajectories on goniometrical data of the single-channel mobile direction finder. The arrangement has a device of forming a bearing, a coefficients calculation block, an inertial navigational system block, a buffer storage device, a block of solving the system of linear algebraic equations, a block of calculation of rectangular coordinates of the target, a reflection arrangement.
EFFECT: determines the parameters of curvilinear trajectories.
FIELD: the invention refers to a system of mobile communication.
SUBSTANCE: the center of definition of the location of mobile objects receives an inquiry to define the locality of another object via the system 7 of transmitting signals or via the protocol network of transmission control/protocol of the internet, confirms identity and control definition of the locality of the subscriber; at that the center of identification of the locality of mobile objects directly requests its own register of locality the address of the commutation center in a current roaming zone of the subscriber. After receiving information about the roaming zone the center of definition of the location of mobile objects takes out information defining the locality of the object in the roaming zone from its own database, directly interacts with the commutation center and the center of defining the locality of the mobile object in the roaming zone, receives data about current location of the subscriber and returns the received information about the location to the inquiring object.
EFFECT: simplifiers pattern of actions in definition of locality.
FIELD: radio engineering, applicable for determination of the bearing of radio signal sources in the radio monitoring systems.
SUBSTANCE: the method is based on reception of the signal of the radio emission source by two aerials, whose focal axes are parallel, and the centers of the aerial aperture are distributed, measurement of the phase difference of the received signals at the aerial outputs, the received signals are transformed to signals of an intermediate frequency, approximately by 40 times lower than the frequency of the received signals, the difference of the phases of the intermediate frequency signals is measured, an approximate estimation of bearing θa to the source of radio emission is perforated, all the values of the bearing (or a part of them) are calculated, and the nearest of them to estimation θa is taken as the bearing to the radio emission source.
EFFECT: the ambiguity of the results of direction finding is eliminated at conservation of the accuracy of the direction finding in the preset sector of 180° without any increase of the number of the aerials and channels of processing of the received signals.
FIELD: physics; radio.
SUBSTANCE: invention may be used in radio frequency source fixing systems. Technical result is achieved as follows. Radio signal is received by five antennas, which form equispaced antenna array; complex cross-spectra of paired signals received by adjacent antennas are measured; signal 2D angular spectrum is generated; phase shifts of signals received by two adjacent antennas are determined. The latter is used to estimate azimuth and elevation angle of the radio signal source. Amplitude difference spectra of signals received by paired adjacent and non-adjacent antennas are measured. Together with phase shift-based azimuth estimation results, they are used to determine the radio signal source azimuth. The said device for the method implementation comprises five antennas interconnected in a specific way, radio-receiving unit, data storage unit, cross-spectra calculating device, cross-spectrum arguments calculating device (5-channel), as well as azimuth phase calculator, elevation angle calculator, calculation parameters sensor, clock-pulse generator, 2D angular spectrum calculator, single-valued phase shift calculator, amplitude difference spectrum calculator, azimuth amplitude calculator and azimuth calculator.
EFFECT: improved accuracy of direction finding and decresed time required for direction finding.
2 cl, 36 dwg
FIELD: physics, measuring.
SUBSTANCE: invention concerns field of devices for direction definition on a radiation source, in particular to devices for direction definition on a radiant of electromagnetic radiation. The device for direction localisation on the source of electromagnetic radiation, contains the truncated parabolic mirror, system of three round diaphragms, coaxial with the parabolic mirror, one of which, with small round paraxial hole, settles down in a plane of truncation of a parabolic mirror, second, continuous, on some distance from the first with possibility of travel along an axis of a parabolic mirror, the third, continuous diaphragm of variable radius, on some distance from the second diaphragm. The data units fixing presence of radiation in the given solid angle of space are located on the device output.
EFFECT: decrease in probability of detection of the device by resorts of a detection and ranging and simplification of adjustment of the device.
FIELD: radio engineering.
SUBSTANCE: method can be used for high precision measurement of coordinates of radio-frequency radiation sources which radiate continuous or quazi-continuous signals by means of flying vehicles. Method is based upon reception of signals from radio-frequency radiation sources at three flying vehicles, re-translation of signals to central processing board and calculation of coordinates of radio-frequency radiation sources from difference in radial velocities of flying vehicles. Signals being re-translated from flying vehicles are subject to additional mutual correlation processing. Difference in radial velocities is calculated on the base of measurement of compression factors determined by maximizing of mutual correlation function of signals re-translated from flying vehicles. Coordinates of radio-frequency radiation sources radiating wideband signals is provided.
EFFECT: widened functional capabilities.