EP3721255A2 - Procédé de mesure passive de propriétés de réflexion électromagnétiques de corps diffusants et procédé de génération d'au moins une cible synthétique pour radar tournant monostatique à travers une plateforme flottante - Google Patents

Procédé de mesure passive de propriétés de réflexion électromagnétiques de corps diffusants et procédé de génération d'au moins une cible synthétique pour radar tournant monostatique à travers une plateforme flottante

Info

Publication number
EP3721255A2
EP3721255A2 EP18815174.0A EP18815174A EP3721255A2 EP 3721255 A2 EP3721255 A2 EP 3721255A2 EP 18815174 A EP18815174 A EP 18815174A EP 3721255 A2 EP3721255 A2 EP 3721255A2
Authority
EP
European Patent Office
Prior art keywords
radar
antenna
signal
transmitter
scattering object
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP18815174.0A
Other languages
German (de)
English (en)
Inventor
Jochen Bredemeyer
Thorsten Schrader
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Brd Vertreten Durch Das Bmwi Dieses Vertreten Durch Den Praesidenten Der Physikalisch Technischen Bundesanstalt
Fcs Flight Calibration Services GmbH
Original Assignee
Brd Vertreten Durch Das Bmwi Dieses Vertreten Durch Den Praesidenten Der Physikalisch Technischen Bundesanstalt
Fcs Flight Calibration Services GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Brd Vertreten Durch Das Bmwi Dieses Vertreten Durch Den Praesidenten Der Physikalisch Technischen Bundesanstalt, Fcs Flight Calibration Services GmbH filed Critical Brd Vertreten Durch Das Bmwi Dieses Vertreten Durch Den Praesidenten Der Physikalisch Technischen Bundesanstalt
Publication of EP3721255A2 publication Critical patent/EP3721255A2/fr
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/021—Auxiliary means for detecting or identifying radar signals or the like, e.g. radar jamming signals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/003—Bistatic radar systems; Multistatic radar systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/06—Systems determining position data of a target
    • G01S13/42—Simultaneous measurement of distance and other co-ordinates
    • G01S13/426—Scanning radar, e.g. 3D radar
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
    • G01S13/76—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein pulse-type signals are transmitted
    • G01S13/767—Responders; Transponders
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/86—Combinations of radar systems with non-radar systems, e.g. sonar, direction finder
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/28—Details of pulse systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/40—Means for monitoring or calibrating

Definitions

  • the invention relates to a method for the passive measurement of electromagnetic reflection properties of scattering bodies with an existing, operationally used (ie operational) radar with a radar antenna for external fertilization of radar signals, a scattering object and a floating platform with position detection device , which has a suitable for the reception of the radar signal measuring antenna with two linear polarization planes and a connected to the measuring antenna, at least two-channel radio receiver.
  • an existing, operationally used (ie operational) radar with a radar antenna for external fertilization of radar signals, a scattering object and a floating platform with position detection device , which has a suitable for the reception of the radar signal measuring antenna with two linear polarization planes and a connected to the measuring antenna, at least two-channel radio receiver.
  • the invention further relates to a method for displaying a simulated radar target by a floating platform with azimuthal and radial extent, in which either a stored signal of the radar transmitter with the measured reflection properties of the above method or a si - mulated, synthetic signal emitted by a coherent transmitter from the floating platform and is effective in a wider azimuth angle range of the radar antenna.
  • the conductivity of the components of the wind turbine differs depending on the mast, nacelle, hub and rotor blades.
  • the size of today's WEA does not allow it to be used in its entirety in a defined electromagnetic environment, e.g. an absorber hall, to measure.
  • the complete irradiation of a fully developed outdoor wind turbine requires the installation of a sender of significant power at a greater distance from the litter object in order to illuminate it evenly, which in turn requires a permit to transmit. The effort for this would be very high overall.
  • the object of the present invention is to provide an improved method for the passive measurement of electromagnetic reflection properties of scattering bodies by a floating platform in order to measure and classify different scattering objects already constructed in the vicinity of operational radars in a height-dependent manner. This results in a database in which the scattering properties of the objects of interest are stored.
  • the radar signal itself and its backscatter are measured from a floating platform.
  • the generation of an artificial target succeeds in that, with knowledge of the real reflection properties or with electromagnetically simulated properties, these properties are transported by means of the floating platform to another location in the detection area of the same or a functionally identical radar at another location.
  • the transmission at this location constitutes a fictitious target and thus allows the examination of the operational usability of the radar and consequently of the compatibility with the planned object.
  • the method for the passive measurement of electromagnetic reflection properties of scattering bodies has the following steps:
  • Receiving the radar signal with the radio receiver of the floating platform at the at least one fixed measuring location Determining the relative reflectivity of the existing scattered object by correlation of the measured at the measurement location, superimposed by reflections of the scattered object radar signal with the known characteristic of the undisturbed radar signal and the characteristic of the radar antenna.
  • the characteristic of the undisturbed radar signal of the radar transmitter and the characteristic of the radar antenna of the radar transmitter can be detected by forming a pattern sequence for an autocorrelation function (AKF) of modulated pulses of the radar transmitter,
  • AMF autocorrelation function
  • the radar antenna and measuring antenna form the focal points of an ellipse.
  • the existing scattering object lies on the edge of this ellipse.
  • the measuring location and scattered object are irradiated to different degrees over time by the rotating radar antenna.
  • the floating platform has a measuring antenna with a known diagram (characteristic) and knows its horizontal orientation during the flight.
  • the characteristic of the radar antenna is also known from the previous measurement. Correcting the result of the autocorrelation (AKF) is then effected as a function of the instantaneous orientations of the radar antenna and the measuring antenna with their known characteristics. It is advantageous if an elevation scanning of the scattering object is carried out at a constant horizontal distance in a respectively specified height difference.
  • dynamic scattering ratios e.g., by moving components of the scattering object
  • dynamic scattering ratios can be determined which produce a microdoppler effect. It is conceivable to form a level difference between the direct radar signal and the reflection from the autocorrelation function (AKF) or to determine the difference for exactly one scattering object by applying a congruent mapping, if the reflection of only this one scattering object during the transit time of a pulse of the radar Signal is receivable.
  • AMF autocorrelation function
  • the level difference can be corrected with knowledge of the horizontal antenna diagrams of the radar antenna as well as the measuring antenna of the floating platform, depending on the alignment.
  • the modulation of the pulses can either be known. However, it can also be recorded by reference measurement in the vicinity of the radar transmitter in the undisturbed transmission channel by measurement with the floating platform or in some other way.
  • the emitted pulses can be expanded pulses of a pulse compression radar or else short, unmodulated pulses.
  • the application of the AKF is generally used to detect the pulses ("matched filter", also called optimal filter or correlation filter).
  • the determination of the reflectivity of a scattering object can take place either in the image area of the AKF or in the time domain by means of a congruent mapping of a measured and parameterizable simulated reflection.
  • the measuring method according to the invention takes place in the vicinity of the scattering objects at selectively selected spatial points which, owing to their position relative to the radar, use precisely these detours to various objects in such a way that they and the object of current interest can be separated. It makes use of the properties of the transmission signal.
  • Modern air traffic control and air defense radars use the principle of pulse compression. In this case, an expanded, long pulse with a large bandwidth time product is sent out and the principle of pulse compression applied to the high temporal and hence radial resolution by applying the AKF with a sequence of patterns (temporally discretized: h (k)). When used, the measurement procedure must have knowledge of this pattern sequence in order to perform pulse compression in turn.
  • method (3) is applicable to the emission of short, unmodulated pulses:
  • the sidelobe distance results. Since the direct signal of the radar will always be stronger than the reflection, its pulse compression always forms the main maximum for a receiving antenna without strong horizontal directivity, the reflections come later according to their detour time. If the respective round trip time is shorter than the length of the expanded radar pulse, the results of the autocorrelation functions are superimposed on the direct signal and the reflections in the image area of the pulse compression.
  • this detour running time must be chosen such that, for the correlation maximum of the reflections, the area adjacent to the main maximum of the direct signal is used with sufficiently attenuated side lobes or in the zeros.
  • the application of pulse compression can be dispensed with. It thus avoids its inherent disadvantage of superimposing the weaker reflections on the side lobes of the stronger signal in the image area and thus the restrictions on the usable detour time.
  • the signal property of the frequency modulation over the pulse length (LFM or NLFM) is exploited with a superposition of a later arriving, same signal from the reflection Sig.
  • the direct pulse is first received at the time to and at this time has the start frequency fo of its frequency modulation.
  • the weaker reflection of a scattering object which occurs later at time ti, in turn has the starting frequency fo and superimposes the direct pulse over its remaining duration.
  • the frequency changes in proportion to the propagation time, so that the complex-valued superposition of two such pulses produces a constant beat of the frequency
  • the aim of this method is to reproduce the measured course by superimposing two analytic signals in such a way that maximum congruency is achieved.
  • the degrees of freedom of the simulated superimposition are a) the time t.sub.i of the arrival of the reflection, b) the relative level, and c) the phase difference at time t.sub.i between the direct signal and the reflection.
  • the time ti a) results from the selected geometric constellation of the measurement.
  • Parameters b) and c) are iteratively adjusted until the ma- ximale congruence is reached. This can be done automatically by a computer algorithm.
  • the final result is the relative level of the reflection as well as the phase difference.
  • a radar transmitter with short, unmodulated pulses can also be used. In the time course of the individual pulse correlation, these distances also give the detour times. Since, however, less signal energy is emitted here than in the case of a long pulse, the signal-to-noise ratio drops significantly during the evaluation and thus increases the measurement uncertainty. Several received pulses are necessary to achieve the same signal-to-noise ratio.
  • the method (2) is preferable to the method (1), since it has a lower measurement uncertainty due to the avoidance of the overlay by side lobes of the stronger signal.
  • reliable determination of the congruence of (2) requires that no further strong reflections occur over the duration of the pulse and change the course of the beat.
  • the ratio between the illumination of the reflector and the location of the measurement must be known. For this purpose, several rounds of the radar are detected in a training mode and from this the rotational speed of the radar transmitter is derived. Furthermore, the horizontal diagrams of the radar antenna are recorded for the individual heights. In a 3D radar (eg air defense) These assumptions only apply if a specific vertical beam is constantly active and no switching is performed for a volume scan. When using the measuring method with such a radar, therefore, appropriate settings must be made.
  • the autocorrelation function (AKF) in the strongest compared to the direct signal of the radar. Due to the temporal stamping and with a known rotational speed, it is possible to deduce the difference angle between measuring location and reflector from the point of view of the radar. From this, a difference of the irradiated field strength can be derived with the known profile of the horizontal diagram, with which the read level difference from the measurement of the autocorrelation function (AKF) must be compensated. This gives the preliminary reflection factor.
  • the horizontal diagram of the measuring antenna must be known. If the measuring antenna points to a specific scattering object and the radar stands at a certain angle from the view of the measuring antenna, this difference must be added to the previously determined reflection factor of the object with the correct sign.
  • the passive measuring method can advantageously have the following steps:
  • the relative reflectivity of a scattering object in combination with the characteristic of the undisturbed radar signal of the radar transmitter and the characteristic of the radar antenna of the Radar transmitter is determined.
  • the relative reflectivity is measured for a real existing interfering object and spent this property of the echo signal to a location in the effective range of the same or another radar transmitter.
  • the relative reflectivity for simulating an echo of at least one planned interfering object is combined with the known or measured characteristic of the undisturbed radar signal of the radar transmitter and the characteristic of the radar antenna of the radar transmitter in order to obtain the signal sent by the reflection properties of the at least one planned (virtual) disturbing object as an artificial echo to the radar signal.
  • the simplest case is when exactly one interfering object is planned and the relative reflectivity of a comparable interfering object is measured with the same radar transmitter or at another action location with a radar transmitter of identical design.
  • the echo pulse measured for the existing jamming object can then be stored and sent out (essentially) unchanged at the reflection location of the planned jamming object.
  • the artificial echo pulse then has to be adjusted in its transmission level and its transmission time to the new distance from the radar and synchronized with the pulse transmission times of the radar transmitter.
  • each simulated scattering object in radially different distance than that of the actual ascent location additionally undergoes a certain time offset in the emission.
  • FIG. 2 shows a diagram of pulses on an ASR channel over an observation time
  • Figure 3 Diagram of a horizontal antenna characteristic with main and side lobes on the azimuth angle
  • FIG. 1 shows a sketch of an arrangement of an operational radar transmitter 1 with a radar antenna 2 and a scattering object 3.
  • a floating platform 4 with a measuring antenna 5 which is used to detect the pulse-compressed radar emitted by the radar antenna 2. Signal is set.
  • the floating platform 4 has a receiver 6 with real-time recognition, a memory and a position detection for the determination of the respective measuring location.
  • the floating platform 4 may additionally have a coherent transmitter 7.
  • FIG. 2 shows an exemplary diagram of measured pulses of an airport radar ASR over an observation time, i. the flight time of the floating platform 4.
  • a measurement of all radar pulses with temporal dating takes place.
  • the beam passages of the rotating radar antenna 2 can be seen, which repeat in the example every five seconds.
  • the revolution time for example, five seconds
  • Figure 3 shows a diagram of a horizontal antenna characteristic with main and side lobes on the azimuth angle. Each point corresponds to a measured, time-dated radar pulse with a specific level.
  • the horizontal one Antenna diagram with main and side lobes can be measured for each measuring height by time spreading and knowledge of the rotation time.
  • the temporal spread is plotted in the diagram of FIG. 3 as receiving power above the azimuth angle.
  • the constant revolution time eg 5 seconds
  • the linear relationship between the time of flight of the floating platform 4 (observation time) plotted on the upper X-axis and the azimuth angle on the lower X. -Axis is applied, produce.
  • FIG. 4 shows in the image region of the pulse compression over time the main maximum from the direct signal at Ops and at the planned locations with specific bypass times 2.3 s and 3.5 s the maximums of the reflections according to method (1).
  • the results of the autocorrelation functions of direct signal and the reflections overlap.
  • FIG. 5 shows in the upper diagram the measured pulse shape as a superimposition of the baseband from the direct signal of a linearly frequency-modulated expanded pulse with a reflected component, whereby a beat with constant frequency and amplitude arises over time.
  • FIG. 6 shows the reflection of a short pulse (0.8 ps) with a long detour time ⁇ t for the application of method (3), in which direct and reflected signals are clearly separable from one another. The relative amplitude of the reflection can be read off with approx. 6 dB.
  • the method for the passive measurement of electromagnetic reflection properties of scattering bodies has the following steps:
  • the modulation of the expanded pulses can be known. However, it can also be recorded by reference measurement in the vicinity of the radar transmitter in the undisturbed transmission channel by measurement with the floating platform or in another way.
  • the transmission signal of the so-called secondary radar can also be used as an application in air traffic control as a query at 1030 MHz in the operating mode "Mode S".
  • the autocorrelation function AKF of this bit sequence can be determined and derived therefrom, just as in the primary radar, a detour delay time.
  • a specified sequence of 56 or 112 data bits can also be generated, which has particularly favorable autocorrelation properties.
  • This data sequence can be transmitted intermittently by the interrogator in accordance with mode S, without the intended purpose of triggering mode S responses of the transponders in aircraft being disturbed, since the sequence of the data bits is additionally selected such that no transponder is therefrom can decode a valid query for answering.
  • the measured reflection properties of individual scattering objects are stored and actively transmitted from the floating platform to other locations in the detection area of the radar generates these artificial targets with the transmitter 7. This simulates the potential effect of the scattered objects at their intended locations.
  • a further correction is necessary because, with reduced distance to the radar, a greater reception field strength actually arises due to the lower free space attenuation of the electromagnetic wave. This can be achieved by additional attenuation of the signal level in the target generator.
  • the comparison of the measurement results of the reflection properties of scattering objects at different distances R1, R2,... Rn of the floating platform can be used to assess the far field properties of the reflection. If the distance R2 is twice as large as R1, then the field strength would have to be smaller by 6dB, which is reflected in just such a difference in the pulse compression.
  • the level measured with the floating platform is proportional to the falling electromagnetic field strength of the radar ("forward scatter").
  • the field strength is effective at a point at a certain distance and elevation to the radar.
  • Assuming the far field properties can be adjusted with a known vertical antenna diagram and a change in the radial distance to the radar of the transmission level of the target generator so that the reflective properties of the target can be transported depending on distance.
  • This azimuthal spread is only applicable if not by the nature of the radar antenna and the signal processing, a direction measurement such as performed by the monopulse method.
  • ATC radars do not use this technique in their primary section. In the case of military air defense radars, this is usually the case when the antenna is designed as a "phased array", even in the horizontal plane.
  • FIG. 7 shows a two-dimensional extension of the fictitious scattering body, starting from the rise point of the floating platform. It is known at a specific ascent location so the timing of the level distribution during the beam passage. This information can now be used to simulate the reflection of a target at another azimuth angle by time-synchronous variation of the transmission level, provided that the side lobes do not fall below the perceptibility threshold of the signal detection in the receiver. In the illustration of the horizontal antenna diagram in FIG. 3, this extends to -40 dB below the main maximum. A continuous angle range of about 16 ° from -8 ° to + 8 ° around the main beam direction can be covered.
  • the radar is fictitiously played through a beam passage of its main maximum, although the instantaneous main radiation direction of the radar is different.
  • the radar spread extends from a point to a surface representable in polar coordinates as shown in FIG. 7.
  • a frequency shift of the individual fictitious targets produces an artificial radial velocity as determined either by moving the entire target o, e.g. Rotation of the blades of wind turbines WEA may occur as Mikrodopp- ler effect. This can be found out by a special measurement of the "worst case" (see above).
  • the delay t1 of the target generator for radial movement and the level correction in the beam pass for tangential movement must be continuous be adjusted. This avoids that the radar discards the target and the lane by its own plausibility check.

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  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

L'invention concerne un procédé de mesure passive de propriétés de réflexion électromagnétiques de corps diffusants avec un émetteur radar existant (1) utilisé de manière fonctionnelle et comprenant une antenne radar (2) destinée à émettre des signaux radar, un objet diffusant (3) et une plate-forme flottante (4) pourvue d'un dispositif de détection de position qui comporte une antenne de mesure, adaptée à la réception de signal radar et comportant deux plans de polarisation linéaire (5), et un récepteur radio (6) à au moins deux canaux qui est relié à l'antenne de mesure.
EP18815174.0A 2017-12-05 2018-12-05 Procédé de mesure passive de propriétés de réflexion électromagnétiques de corps diffusants et procédé de génération d'au moins une cible synthétique pour radar tournant monostatique à travers une plateforme flottante Pending EP3721255A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017128917 2017-12-05
PCT/EP2018/083595 WO2019110642A2 (fr) 2017-12-05 2018-12-05 Procédé de mesure passive de propriétés de réflexion électromagnétiques de corps diffusants et procédé de génération d'au moins une cible synthétique pour radar tournant monostatique à travers une plateforme flottante

Publications (1)

Publication Number Publication Date
EP3721255A2 true EP3721255A2 (fr) 2020-10-14

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EP18815174.0A Pending EP3721255A2 (fr) 2017-12-05 2018-12-05 Procédé de mesure passive de propriétés de réflexion électromagnétiques de corps diffusants et procédé de génération d'au moins une cible synthétique pour radar tournant monostatique à travers une plateforme flottante

Country Status (2)

Country Link
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WO (1) WO2019110642A2 (fr)

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CN111025256A (zh) * 2019-12-26 2020-04-17 湖南华诺星空电子技术有限公司 一种机载雷达的微弱生命体征信号的检测方法及系统
CN112578345B (zh) * 2020-11-20 2024-06-14 福瑞泰克智能系统有限公司 一种雷达遮挡检测方法、装置、设备及存储介质
CN116224261B (zh) * 2023-05-08 2023-07-14 中国人民解放军63921部队 一种面向机载大口径雷达的零值标定方法

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WO2019110642A2 (fr) 2019-06-13

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