RU2496122C2 - Method of detecting single-loop parametric scatterers with nonlinear generation of synchronising signal - Google Patents

Method of detecting single-loop parametric scatterers with nonlinear generation of synchronising signal Download PDF

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RU2496122C2
RU2496122C2 RU2011105671/07A RU2011105671A RU2496122C2 RU 2496122 C2 RU2496122 C2 RU 2496122C2 RU 2011105671/07 A RU2011105671/07 A RU 2011105671/07A RU 2011105671 A RU2011105671 A RU 2011105671A RU 2496122 C2 RU2496122 C2 RU 2496122C2
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frequency
radio
pulse
signal
synchronizing
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RU2011105671A (en
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Николай Юрьевич Бабанов
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Государственное образовательное учреждение высшего профессионального образования "Нижегородский государственный инженерно-экономический институт"
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Abstract

FIELD: radio engineering, communication.
SUBSTANCE: in order to apply coherent integration when detecting single-loop parametric scatterers (SPS), a synchronising signal is emitted at the same time as pumping radio pulses at frequency f. When detecting SPS with natural frequency of parametric excitation of 0.5f, a synchronising radio pulse is emitted at frequency 0.25f. The response signal from the parametric scatterer is synchronised from a signal with frequency 0.5f, which is a spectral component at second harmonic frequency during nonlinear conversion of the synchronising radio pulse on a nonlinear element which is a component of the parametric scatterer, and high-frequency filling phases of synchronising radio pulses for alternative binary symbols of a selected binary encoding law differ by π/2. The synchronising radio pulse is emitted simultaneously or a little earlier than the pumping radio pulse. Under the effect of said radio pulses, nonlinear interference can arise on interfering nonlinear scatterers at a frequency of the received signal 0.5f. To compensate for said interference, an additional radio pulse with duration equal to the time of the synchronising radio pulse and phase differing by π/2 is emitted before or after the synchronising radio pulse at the same frequency.
EFFECT: improved method.
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Description

The invention relates to methods for detecting parametric scatterers.
Known by the [Radio complex search markers, patent RU 2108596 C1], a method for detecting parametric diffusers. The method allows to solve the problem of detecting objects, in particular people, marked with passive non-linear markers - transponders, which are used as parametric scatterers. The method consists in the fact that a parametric diffuser is previously placed on the search object. The region of space in which the search object can be located is irradiated with a probing signal at a frequency f, and a signal scattered by the marker at a subharmonic frequency equal to 0.5 f is received. If the detection threshold is exceeded, a decision is made about the presence of a search object in the detection zone.
This method has a significant drawback, namely, not sufficient efficiency, because either it is not possible to use a pulsed probe signal, or coherent reception of the scattered signal is not provided. This is due to the fact that upon excitation of each radio pulse scattered by the signal marker at the subharmonic frequency, two equally probable phase values differing by π are possible [P. Gorbachev. Signal Formation by a System of Passive Subharmonic Diffusers // Radio Engineering and Electronics, 1995, vol. 40, N11, pp. 1606-1610]. As a result, the signal scattered by the subharmonic is not coherent, even with a coherent probe signal. In addition, the strict ratio of the frequencies of the received and the probing signal limits the possibility of using the frequency resource.
Also known is a method for detecting single-circuit parametric scatterers according to [Non-linear passive marker - parametric scatterer, patent RU 2336538 C2]. The method consists in the fact that a single-circuit parametric diffuser is previously placed on the search object, namely on a life jacket. The region of space in which the search object can be located is irradiated by a probing signal at a frequency f, and a signal scattered by the marker at a subharmonic frequency equal to 0.5 f is received. If the detection threshold is exceeded, a decision is made about the presence of a search object in the detection zone.
The method does not allow the use of coherent signal accumulation in the receiver, since the phase of the generated signal at the frequency of parametric generation is random.
These shortcomings are overcome in the method for detecting single-circuit parametric scatterers, known from [S. Lartsov. A probe signal for detecting parametric scatterers // Radio Engineering, 2000, N5, pp. 8-12]. The method allows to solve the problem of detecting objects marked with passive nonlinear responder markers, which are used as single-circuit parametric scatterers.
The method consists in the fact that a single-circuit parametric scatterer is preliminarily placed on the search object, the region of space in which the search object can be located is irradiated with a probing signal, which, as a result of parametric generation in a single-circuit parametric diffuser, generates a sequence of packs of narrow-band coherent radio pulses of the scattered signal, each packet corresponds to the code word, and each radio pulse of the packet corresponds to the symbol of the selected binary law, the code a binary sequence, the elements of which correspond to π differing values of the phase of high-frequency filling of radio pulses, for this the probing signal includes a sequence of packs of narrow-band coherent rectangular radio pulses of a pump signal with a frequency of high-frequency filling / and pulse duration τ, in addition, the probing signal includes a sequence narrow-band coherent synchronizing radio pulses with a frequency of high-frequency filling f 1 and the duration of the radio pulse is τ 1 , while τ 1 is significantly less than τ, the high-frequency phase of the synchronizing radio pulse filling corresponds to the current ordinal symbol of the selected binary coding law, and the leading edge of the synchronizing pulse coincides with the leading edge of the pump pulse or is ahead of it by a time not exceeding τ 1 after the synchronizing a compensating radio pulse having the same amplitude and frequency of a high-frequency fill as the synchronizing radio pulse In this case, the phase of the high-frequency filling of the compensating radio pulse differs by π from the phase of the high-frequency filling of the synchronizing radio pulse, and a sequence of narrow-band coherent radio pulses of the scattered signal with a frequency of high-frequency filling equal to the frequency of parametric generation of the parametric scatterer 0.5 f is adopted, while coherent accumulation is achieved, which ensures maximum level of accumulation in accordance with the selected binary coding law, when shenii detection threshold decision is made about the presence in the area of detection of the search object.
The method allows for coherent signal accumulation in the receiving device, however, when it is implemented, synchronizing radio pulses at a frequency of 0.5 f are used to detect single-circuit parametric scatterers, which are coherent interference to the radio reception.
This disadvantage is eliminated in the method for detecting single-circuit parametric scatterers, known from [Abstract RU 2009118092 A to the application for invention, Method for detecting double-circuit or single-circuit parametric scatterers, date publ. November 20, 2010], which consists in the fact that a synchronizing signal is generated on a nonlinear element that is part of a parametric scatterer, for which, in addition to a pump signal with a frequency f, there are two auxiliary signals with frequencies f 1 and f 2 in t this, one of the products of nonlinear conversion of these auxiliary signals is 0.5f: 0.5f = nf 1 ± mf 2 , where n and m are integers
A feature of the implementation of the method is that when irradiating objects containing non-linear components with a probe signal containing spectral components with frequencies f 1 and f 2 , nonlinear scattering can result in non-linear interference at frequencies f P = nf 1 ± mf 2 . One of these interferences is scattered at a frequency of 0.5f and interferes with reception. To compensate for it, after the synchronizing radio pulses, compensating radio pulses with the parameters of the synchronizing radio pulses are emitted, but one of the compensating radio pulses at a frequency f 1 or f 2 has a phase opposite to that of the corresponding synchronizing radio pulse.
However, when implementing this method, the number of spectral components in the composition of the probe signal is increased to three.
This disadvantage is eliminated in the method for detecting single-circuit parametric scatterers with non-linear generation of a synchronizing signal, known from [Abstract RU 2009118092 A to the application for invention, Method for detecting double-circuit or single-circuit parametric scatterers, date publ. November 20, 2010], which consists in the fact that the synchronizing signal is generated on a nonlinear element that is part of the parametric scatterer by including in the probe signal, in addition to the pump signal with a frequency f, one auxiliary signal with a frequency of 1.5 f.
When objects containing non-linear components are irradiated with such a probe signal, non-linear interference can occur due to non-linear interaction of the radio pulse of the pump signal with frequency f and the synchronizing radio pulse with frequency 1.5 f. To eliminate non-linear interference, after the synchronizing radio pulses, a compensating radio pulse is emitted whose duration τ 2 is equal to the overlap time of the synchronizing radio pulse and the pump radio pulse, while the phase of the compensating radio pulse is opposite to the phase of the corresponding synchronizing radio pulse.
The method is chosen as a prototype and consists in the fact that a single-circuit parametric scatterer is preliminarily placed on the search object, the region of space in which the search object can be located is irradiated with a probing signal, which, as a result of parametric generation in a single-circuit parametric scatterer, is a sequence of packs of narrow-band coherent radio pulses of the response signal, each packet corresponds to a code word, and each radio pulse of the packet corresponds to the symbol of the selected bin of the coding law, which is a binary sequence, the elements of which correspond, differing by π, to the values of the phase of high-frequency filling of radio pulses, for this the probing signal includes a sequence of packs of narrow-band coherent rectangular radio pulses of a pump signal with a frequency of high-frequency filling f and pulse duration τ, in addition, a probing signal includes a sequence of narrow-band coherent synchronizing radio pulses with a high-frequency frequency nd filling f 1 and a duration radio pulse τ 1, where τ 2 is substantially less τ, the phase of the high-frequency synchronizing radio pulse corresponds to the current ordinal symbol selected binary coding law, and the rising edge timing rf pulse coincides with the leading edge radiopulse pump signal either ahead of it at the time, not exceeding τ 1, before or after the rf pulse timing compensating radiated RF pulse having the same timing as at radioimpul the amplitude and frequency of the high-frequency filling, while the high-frequency filling phase of the compensating radio pulse is π different from the high-frequency filling phase of the synchronizing radio pulse, the time interval from the leading edge of the first pulse of the pair of synchronizing and compensating radio pulses to the trailing edge of the second pulse of this pair is always less than τ, and the sequence is accepted narrow-band coherent radio pulses of the response signal with a frequency of high-frequency filling equal to the frequency the parametric generation of the 0.5f parametric scatterer, while coherent accumulation is performed, which ensures the maximum accumulation level in accordance with the selected binary coding law, when the detection threshold is exceeded, a decision is made about the presence of a search object in the detection zone, while the frequency of the high-frequency filling of synchronizing radio pulses f 1 is 1.5f, and the duration of the compensating radio pulse τ 2 is equal to the overlap time of the synchronizing radio pulse and the pump radio pulse.
The disadvantage of the prototype is that the synchronizing signal is always higher frequency than the pump signal, which limits the use of the frequency resource.
The invention has the task of developing a method for detecting single-circuit parametric scatterers with non-linear formation of a synchronizing signal. In this case, the synchronizing signal should be lower than the pump signal.
The disadvantage of the prototype is eliminated in the proposed method for the detection of single-circuit parametric scatterers with non-linear generation of a synchronizing signal, which consists in the fact that a single-circuit parametric scatterer is preliminarily placed on the search object, the area of the space in which the search object can be located is irradiated by a probe signal, which forms as a result of parametric generation in a single-circuit parametric scatterer, a sequence of packs of narrow-band coherent radio pulses of the response signal, with each packet corresponding to a code word, and each radio pulse of the packet corresponding to the symbol of the selected binary coding law, which is a binary sequence whose elements correspond, differing by π, to the phase values of the high-frequency filling of the radio pulses, for this the probe signal includes a sequence of packets of narrow-band coherent rectangular radio pulses of a pump signal with a high-frequency filling frequency f and pulse duration lsov τ, besides the probe signal comprises a sequence of narrowband coherent synchronizing RF pulse with a frequency of the high-frequency f 1 and a duration radio pulse τ 1 wherein τ 1 substantially smaller than τ, the phase of the high-frequency synchronizing radio pulse corresponds to the current ordinal symbol selected binary law encoding and leading edge synchronizing radio pulse coincides with the leading edge of the radio pulse of the pump signal or ahead of it for a time do not exceed it τ 1, before or after the synchronizing radio pulse emitted compensating RF pulse having the same that of the clock radio pulse amplitude and frequency of the high-frequency, the time period from the leading edge of the first pulse pair synchronizing and compensating RF pulse to the trailing edge of the second pulse of the pair is always less than τ, and a sequence of narrow-band coherent radio pulses of the response signal with a frequency of high-frequency filling equal to the frequency of the parameter the generation of a 0.5 f parametric scatterer, in this case coherent accumulation is performed, which ensures the maximum accumulation level in accordance with the selected binary coding law; when the detection threshold is exceeded, a decision is made about the presence of a search object in the detection zone, while the synchronization of the radio pulses of the response signal occurs from radio pulses that appear as a result of a nonlinear transformation of synchronizing radio pulses on a nonlinear element that is part of the parametric diffuser and are the second harmonic of the synchronizing radio pulses, for this the frequency of the high-frequency filling of the synchronizing radio pulses f 1 is 0.25f, the duration of the compensating radio pulse is equal to the duration of the synchronizing radio pulse, the phases of the high-frequency filling of the synchronizing radio pulse for alternative binary symbols of the selected binary coding law differ by π / 2, the phase of the high-frequency filling of the compensating radio pulse differs from the phase of the high-frequency π / 2 fillings of the synchronizing radio pulse.
The essence of the invention lies in the fact that synchronization occurs from the oscillation that appears as a result of a nonlinear transformation of the synchronizing pulse. Nonlinear conversion occurs on a nonlinear element that is part of the parametric scatterer. In particular, it can be a semiconductor diode, which is an element of a parametric generator. This clock signal is the second harmonic of the clock pulse. Accordingly, the frequency at which synchronization occurs is: 0.5f = 2 × 0.25f 1 ; the phases “imposed” upon synchronization of the response signal pulses for alternative symbols of the selected binary coding law differ by i, the phases of the signals generated as non-linear interference from synchronizing and compensating radio pulses and arriving at the receiver input differ by i and will be compensated in the receiver.
The claimed technical solution can be implemented using a detector of single-circuit parametric scatterers, the structural diagram of which is shown in Fig. 1, where 1 is a sinusoidal signal generator, 2 is a quadruple frequency multiplier, 3 is a phase modulator, 4 is an amplitude modulator, 5 is a reference generator pulses, 6 - shaper, 7, 8 - high-frequency amplifiers, 9, 10, 12 - antennas, 11 - parametric scatterer, 13 - high-frequency amplifier, 14 - analog-to-digital converter, 15 - signal processor, 16 - indicator.
Signal outputs 1 and 2 of the sinusoidal signal generator 1 are connected to the input from the frequency multiplier four times 2 and to the signal input 1 of the phase modulator 3. The frequency multiplier four times 2 is connected to the signal input 1 of the amplitude modulator 4. The output of the amplitude modulator 4 is connected to the input of the high-frequency amplifier 7. The output of the high-frequency amplifier 7 is connected to the input of the antenna 10.
The output of the phase modulator 3 is connected to the input of the high-frequency amplifier 8. The output of the high-frequency amplifier 8 is connected by the microwave path to the input of the antenna 9.
The reference pulse generator 5 is connected to the input of the shaper 6.
The output 1 of the shaper 6 is connected to the control input 2 of the amplitude modulator 4, the output 2 of the shaper 6 is connected to the control input 2 of the phase modulator 3. The output 3 of the shaper 6 is connected to the auxiliary input 2 of the signal processor 15.
The antenna 12 is connected to the input of the high-frequency amplifier 13 tuned to the frequency f / 2. The output of the high-frequency amplifier 13 is connected to the input 14 of the analog-to-digital converter 14. The output of the analog-to-digital converter 14 is connected to the signal input 1 of the signal processor 15, the output of the signal processor 15 is connected to the input of the indicator 16.
In the irradiation zone of the antennas 9, 10, 12 is a parametric diffuser 11.
The detector parametric scatterers works as follows.
The sine wave generator 1 generates a continuous signal at a frequency f / 2. This signal passes through the frequency multiplier four times 2 and enters the signal input 1 of the amplitude modulator 4. At the same time, this signal enters the signal input 1 of the phase modulator 3.
At the same time, the reference pulse generator 5 generates a clock sequence supplied to the input of the shaper 6. This clock sequence synchronizes the operation of the radiating part of the detector of parametric scatterers, its conditional waveform is shown in figure 2, curve 1.
The clock sequence in the shaper 6 is converted into a sequence of video control pulses of the phase modulator 3 and into a sequence of video control pulses of the amplitude modulator 4. In Fig. 2, curve 2 presents a conditional waveform of a pair of pulses of a sequence of video pulses of control of a phase modulator 3: the 1st pulse of the pair corresponds to a synchronizing video pulse, The 2nd pulse of the pair corresponds to a compensating video pulse. Figure 2, curve 3 presents the conditional waveform of the video pulse of the sequence of video pulses of the control of the amplitude modulator 4. In this case, the video pulse of the sequence of video pulses of the control of the amplitude modulator 4 contains information about the beginning and end of the radiation of the pump signal pulses. The first pulse of a pair of sequences of video pulses of control of the phase modulator 3 contains information about the value of the current symbol of the selected binary coding law: positive and negative polarities correspond to opposite symbols. The polarity of the 2nd pulse of a pair of a sequence of video pulses controlling a phase modulator is always opposite to the first.
The control signals of the amplitude modulator 4 are generated at the output 1 of the shaper 6 in the form of video pulses following each other after a certain period of time. All control signals dare the same duration and polarity. The position of the leading edge of the control video pulse of the amplitude modulator 4 is somewhat behind the leading edge of the first video pulse in the pair of the video control pulses of the phase modulator 3. The position of the leading edge of the control video pulse of the amplitude modulator 4 is determined by the position of the leading edge and corresponds to the specified pump pulse duration t.
The control signals of the phase modulator 3 are generated at the output 2 of the shaper 6 and fed to the control input 2 of the phase modulator 3. The phase modulator 3 generates a signal in accordance with the polarity of the control video pulses. As a result, a sequence of packs of narrow-band coherent pairs of consecutive auxiliary radio pulses with a high-frequency filling frequency f / 4, with a duration of each of the paired radio pulses τ 1 is formed , with τ 1 << τ. The phase of the first radio pulse from the pair is determined by the selected binary coding law. In this case, the symbol “1” corresponds to a zero phase value, and the symbol “0” corresponds to a phase value that differs by π / 2. The phase of the second radio pulse always differs from the phase of the first radio pulse by π / 2.
In Fig. 2, curve 4 shows a conditional waveform of a pair of radio pulses of a sequence of packs of narrow-band coherent pairs of auxiliary radio pulses following one after another: the first pulse of the pair corresponds to a synchronizing radio pulse, the second pulse of a pair corresponds to a compensating radio pulse.
The formed sequence of packs of narrow-band coherent pairs of successive auxiliary radio pulses with a high-frequency filling frequency f / 4 passes through a high-frequency amplifier 8 and antenna 9, with which it is radiated into space in the direction of the parametric scatterer 11.
On a parametric scatterer 11, a sequence of packets of narrow-band coherent pairs of consecutive auxiliary radio pulses is converted into a sequence of synchronizing and compensating radio pulses with a frequency f / 2, the first of which sets the phase of the response signal excited in the parametric scatterer. The conditional waveform of a pair of radio pulses of this sequence is presented in figure 2, curve 5.
Simultaneously, the control signals of the amplitude modulator 4 are fed to the control input 2 of the amplitude modulator 4. The amplitude modulator 4 in accordance with the control signal at the input 2 forms a sequence of rectangular radio pulses with a high-frequency filling frequency f.
As a result, a sequence of packs of narrow-band coherent rectangular radio pulses of a pump signal with a high-frequency filling frequency / and a duration of radio pulses τ is formed. This signal is amplified by the amplifier 7 and emitted by the antenna 10 in the direction of the parametric scattering 11. The conditional waveform of this sequence is shown in figure 2, curve 6.
On a parametric scatterer 11, a sequence of packs of narrow-band coherent radio pulses of the response signal is formed. Each radio pulse of this sequence corresponds to a symbol of the selected binary coding law.
The radio pulses of the scattered signal are received by the antenna 12, amplified by a high-frequency amplifier 13 and fed to the input of an analog-to-digital converter 14, where the input signal is digitized. The digitized signal is fed to the signal processor 15, where coherent accumulation is performed, providing the maximum level of coherent accumulation of the received signal corresponding to the selected binary coding law. The result of coherent accumulation is compared with a threshold, when exceeded, a signal is sent to indicator 16 about target detection.
As the generator of the sinusoidal signal 1, a standard generator G4-164 can be used. The doubler 2 can be made according to [S.A. Drobov, S.I. Bychkov. Radio transmitting devices // Sov.Radio, M., 1968, pp. 117-123]. Phase modulator 3 can be implemented according to [S.A. Drobov, S.I. Bychkov. Radio transmitting devices // Sov. Radio, M. 1968, pp. 299-335]. Amplitude modulator 4 can be implemented according to [S.A. Drobov, S.I. Bychkov Radio transmitting devices // Sov. Radio, M. 1968, pp. 240-277]. As a generator of reference pulses 5, a standard generator G5-28 can be used, 6 - the shaper can be implemented according to [V.G. Gusev, Yu.M. Gusev. Electronics // M. Higher School, 1991, 2nd edition revised and expanded, pp. 489-585]. As high-frequency amplifiers 7, 8, amplifiers from a standard generator G4-128 can be used. As antennas 9, 10, 12, antennas P6-33 can be used. The parametric diffuser 11 can be made on the basis of [patent RU 2108596 C1, Marker search radio complex]. As a high-frequency amplifier 13, a standard low-noise amplifier MAX 2640 can be used. As an analog-to-digital converter 14, an ZET 230 ADC can be used. As a signal processor 15, a TMS 320 C 2000 signal processor can be used. Coherent accumulation providing the maximum level accumulation in accordance with the selected binary coding law can be performed on the basis of [V.I. Tikhonov. Optimum signal reception. M. Radio and Communications, 1983, pp. 37-60]. As indicator 16, a Pentium 4-type computer can be used.
Thus, the proposed technical solution allows for the implementation of non-linear formation of a synchronizing signal. In this case, the synchronizing signal is lower frequency than the pump signal. Reflections of the synchronizing signal from the underlying surface and terrain objects can be eliminated on the basis of frequency selection.

Claims (1)

  1. A method for detecting single-circuit parametric scatterers with non-linear generation of a synchronizing signal, which consists in the fact that a single-circuit parametric scatterer is preliminarily placed on the search object, the region of space in which the search object can be located is irradiated with a probing signal, which forms a sequence of packets as a result of parametric generation in the single-circuit parametric scatterer narrow-band coherent radio pulses of the response signal, with each packet corresponds to a code word, and each radio pulse of the packet corresponds to a symbol of the selected binary coding law, which is a binary sequence whose elements correspond to π values of the phase of high-frequency filling of radio pulses, for this the probe signal includes a sequence of packs of narrow-band coherent rectangular radio pulses of a pump signal with a high-frequency filling frequency f and pulse duration t, in addition, the probe signal includes atelnost narrowband coherent synchronizing RF pulse with a frequency of the high-frequency f 1 and a duration radio pulse τ 1 wherein τ 1 substantially smaller than τ, the phase of the high-frequency synchronizing radio pulse corresponds to the current ordinal symbol selected binary law coding, but the rising edge timing rf pulse coincides with the leading edge of the radio pulse signal pump either ahead of it for a time not exceeding τ 1 before or after the synchronizing radio pulse a compensating radio pulse is emitted that has the same amplitude and frequency of high-frequency filling as the synchronizing radio pulse, the time interval from the leading edge of the first pulse of a pair of synchronizing and compensating radio pulses to the trailing edge of the second pulse of this pair is always less than τ, and a sequence of narrow-band coherent radio pulses of the response signal is received from the frequency of the high-frequency filling equal to the frequency of the parametric generation of the parametric scatterer 0.5f, at this produces coherent accumulation, which ensures the maximum level of accumulation in accordance with the selected binary coding law, when the detection threshold is exceeded, a decision is made about the presence of a search object in the detection zone, characterized in that the synchronization of the radio pulses of the response signal occurs from the radio pulses that appear as a result of non-linear synchronization conversion radio pulses on a nonlinear element that is part of the parametric scatterer, and are the second harmo Ikoyi synchronizing radio pulses, for this clock frequency of the high-frequency radio pulses f 1, f is 0.25, the duration of the compensating radio pulse duration equal to the synchronizing radio pulse phase high-frequency clock radio pulse for alternate binary symbols selected binary coding law differ by π / 2, the phase of the high-frequency compensating the radio pulse differs from the phase of the high-frequency filling of the synchronizing radio pulse to π / 2.
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US4757315A (en) * 1986-02-20 1988-07-12 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Method and apparatus for measuring distance
US5486830A (en) * 1994-04-06 1996-01-23 The United States Of America As Represented By The United States Department Of Energy Radar transponder apparatus and signal processing technique
RU94036233A (en) * 1994-09-28 1996-07-20 С.А. Бахарев Device for detecting and direction finding of low-frequency hydroacoustic radiations
RU2145424C1 (en) * 1999-06-21 2000-02-10 Воронежское конструкторское бюро антенно-фидерных устройств Method of detection of object ( versions )
EP1640745A2 (en) * 2004-09-24 2006-03-29 Meta System S.p.A. Obstacle detection method and system, particularly for systems for assisting the parking of vehicles
RU2336538C2 (en) * 2006-06-28 2008-10-20 Сергей Викторович Ларцов Non-linear passive marker-parameter diffuser
WO2010034933A1 (en) * 2008-09-23 2010-04-01 Universite Paris 13 System and method for detecting at least one object having a marker
RU2009118092A (en) * 2009-05-12 2010-11-20 Сергей Викторович Ларцов (RU) Method for detecting two-circuit or single-circuit parametric diffusers

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4757315A (en) * 1986-02-20 1988-07-12 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Method and apparatus for measuring distance
US5486830A (en) * 1994-04-06 1996-01-23 The United States Of America As Represented By The United States Department Of Energy Radar transponder apparatus and signal processing technique
RU94036233A (en) * 1994-09-28 1996-07-20 С.А. Бахарев Device for detecting and direction finding of low-frequency hydroacoustic radiations
RU2145424C1 (en) * 1999-06-21 2000-02-10 Воронежское конструкторское бюро антенно-фидерных устройств Method of detection of object ( versions )
EP1640745A2 (en) * 2004-09-24 2006-03-29 Meta System S.p.A. Obstacle detection method and system, particularly for systems for assisting the parking of vehicles
RU2336538C2 (en) * 2006-06-28 2008-10-20 Сергей Викторович Ларцов Non-linear passive marker-parameter diffuser
WO2010034933A1 (en) * 2008-09-23 2010-04-01 Universite Paris 13 System and method for detecting at least one object having a marker
RU2009118092A (en) * 2009-05-12 2010-11-20 Сергей Викторович Ларцов (RU) Method for detecting two-circuit or single-circuit parametric diffusers

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