CN113219418A - High-isolation miniaturized cross-eye interference system implementation method - Google Patents
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Abstract
The invention relates to a cross-eye interference system, in particular to a high-isolation miniaturized cross-eye interference system implementation method, which comprises the steps of carrying out high-isolation design on a receiving and transmitting antenna group, generating a correction signal by utilizing a signal processing module, transmitting the correction signal to a radio frequency module, respectively coupling a path of radio frequency signal by each radio frequency module, transmitting the radio frequency signal to another radio frequency module, processing the received radio frequency signal by the radio frequency module, transmitting the radio frequency signal to the signal processing module, obtaining amplitude and phase calibration quantity by the signal processing module through a loop signal, carrying out amplitude and phase correction, carrying out reverse phase processing on the radar signal by the receiving and transmitting antenna group after receiving the radar signal, aiming at radar radiation by the other receiving and transmitting antenna group, and simultaneously aiming at the radar radiation by the receiving and transmitting antenna group; the technical scheme provided by the invention can effectively overcome the defects of poor isolation between the receiving and transmitting antennas and incapability of simultaneously ensuring amplitude and phase precision and interference effect in the prior art.
Description
Technical Field
The invention relates to a cross-eye interference system, in particular to a high-isolation miniaturized cross-eye interference system implementation method.
Background
The cross-eye interference principle is as shown in fig. 4, a transmission signal of an external radiation source is received by a receiving antenna of an interference source 1, the interference source 1 inverts the received signal, and then the received signal is forwarded to an interference source 2 and radiated by a transmitting antenna of the interference source 2; the received signal of the interference source 2 is forwarded to the transmitting antenna of the interference source 1 to radiate outwards. If the phase and amplitude consistency of the two transceiving loops can be ensured, because the space wave paths are the same, the two interference signals are subjected to phase reversal superposition at an external radiation source, so that a distorted magnetic field is generated, the wave front of the signals is changed, and the effect of angle deviation guiding is realized.
There are two implementations of the conventional cross-eye interference system:
(1) pure analog direct forwarding: two receiving and transmitting loops adopt pure analog devices, wherein one loop only has a power amplifier, and the other loop is provided with a power amplifier and an inverter. The scheme is simple to implement, is directly transmitted, has no digital storage and processing delay, and can ensure that target echoes and interference signals are within a range gate of the radar, but the scheme has the defects of extremely high requirement on the amplitude and phase of an analog device and certain drift of the amplitude and phase characteristics of each loop along with the change of temperature, so that the amplitude and phase consistency of the two loops is difficult to ensure, and the interference effect is greatly reduced;
(2) digital store and forward (DRFM): the scheme has a digital processing unit, and signals of the two loops are stored and forwarded in the digital processing unit. The technical scheme has the advantages that the amplitude-phase requirement of the device can be reduced by a design correction method, amplitude-phase control can be realized digitally, and the accuracy is high, but the technical scheme has the defect that a certain time delay exists after signals are stored and processed, so that target echoes and interference signals are possibly not in a range gate of the radar, and are confirmed by the radar to be two targets for respective tracking, and the effect of protecting the targets is not achieved.
Meanwhile, according to the working principle of the cross-eye interference system, the two schemes also have the problem of high receiving and transmitting isolation, in order to enable the target echo and the cross-eye interference signal to be in the same range gate, the cross-eye interference system requires the receiving and transmitting to work simultaneously, so the problem of the receiving and transmitting isolation needs to be solved, which is also a difficult point for realizing the cross-eye interference system, especially for a miniaturized system, because the distance of the receiving and transmitting antenna of the miniaturized system is small, the requirement of the receiving and transmitting to work simultaneously is difficult to achieve through space isolation.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects in the prior art, the invention provides a high-isolation miniaturized cross-eye interference system implementation method, which can effectively overcome the defects that in the prior art, the isolation between transmitting and receiving antennas is poor, and the amplitude and phase precision and the interference effect cannot be simultaneously ensured.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme:
a method for realizing a high-isolation miniaturized cross-eye interference system comprises the following steps:
s1, designing the high isolation of the transmitting and receiving antenna group;
s2, generating a correction signal by using the signal processing module, and sending the correction signal to the radio frequency modules, wherein each radio frequency module is respectively coupled with a path of radio frequency signal and sends the radio frequency signal to another radio frequency module;
s3, the radio frequency module processes the received radio frequency signal and sends the radio frequency signal to the signal processing module, and the signal processing module obtains amplitude and phase calibration quantity through the loop signal and performs amplitude and phase correction;
and S4, after the receiving and transmitting antenna group receives the radar signal, the radar signal is subjected to phase inversion processing, the other receiving and transmitting antenna group is used for aiming at the radar for radiation, and meanwhile, the radar signal received by the other receiving and transmitting antenna group is used for aiming at the radar for radiation.
Preferably, in S1, the high isolation design for the transceiver antenna group includes:
calculating the sensitivity Pr and the transmitting power Po of the receiver, and calculating the isolation requirement Isp according to the following formula:
Isp>Po-Pr+Dr。
preferably, the receiver sensitivity Pr is calculated according to the following formula:
Pr＝-114+10log10(B)+NF+Dr
wherein, B is the instantaneous bandwidth of the system, unit MHz, NF is the noise coefficient of the receiver, and Dr is the detection signal-to-noise ratio.
Preferably, the step S2 of generating the calibration signal by the signal processing module and sending the calibration signal to the rf module includes:
the FPGA in the signal processing module generates 2 paths of baseband correction signals, the baseband correction signals are converted into intermediate frequency signals after digital up-conversion and digital-to-analog converters, and the intermediate frequency signals are respectively sent to the transmitting channels of the 2 radio frequency modules.
Preferably, each rf module in S2 respectively couples out a rf signal to send to another rf module, including:
the intermediate frequency signal is converted into a radio frequency signal after being mixed and amplified in the radio frequency module, and each radio frequency module is coupled with one path of radio frequency signal respectively and is sent into a receiving channel of the other radio frequency module through a radio frequency cable.
Preferably, the processing of the received rf signal by the rf module in S3 and sending to the signal processing module includes:
the radio frequency module carries out down-conversion after receiving radio frequency signals through switch switching, the radio frequency signals are changed into intermediate frequency signals, and the intermediate frequency signals are sent into the signal processing module through the radio frequency cable, and receiving of 2 loop correction signals is completed.
Preferably, the signal processing module in S3 obtains the amplitude and phase calibration quantity through the loop signal, and performs amplitude and phase correction, including:
the signal processing module takes one of the loop signals as a reference to obtain the amplitude and phase adjustment CR1 of the other loop signal;
calculating the magnitude phase calibration quantity according to the following formula:
the amplitude-phase calibration quantity is CR1+ CR 2;
CR2 is the amplitude and phase adjustment amount of the antenna and the phase-stable cable not included in the calibration loop, and is obtained by a darkroom internal test.
Preferably, in S4, after the transceiving antenna group receives the radar signal, the radar signal is processed in reverse phase and directed to the radar radiation by the other transceiving antenna group, and the radar signal received by the other transceiving antenna group is directed to the radar radiation by the transceiving antenna group, including:
after receiving radar signals, receiving antennas of the transceiving antenna groups are subjected to down-conversion processing by the radio frequency module, intermediate frequency signals are sent to the signal processing module for digitalization and reverse phase processing, then digital-to-analog conversion is carried out in the signal processing module, the intermediate frequency signals are sent to the radio frequency module for up-conversion and amplification, and then are sent to a transmitting antenna of the other transceiving antenna group to aim at radar radiation;
after receiving the radar signal, the receiving antenna of the other transceiving antenna group carries out the process processing except phase inversion on the received signal through the radio frequency module and the signal processing module, and the transmitting antenna of the transceiving antenna group aims at the radar radiation;
interference signals transmitted by transmitting antennas of the two groups of transmitting and receiving antenna groups generate distorted phase wave fronts after being subjected to phase inversion superposition at radars, and stable cross eye interference is formed.
Preferably, the transceiving antenna group comprises a transceiving antenna group A and a transceiving antenna group B which have the same structure, polarization directions of the two transceiving antennas in the transceiving antenna group A and the transceiving antenna group B are both orthogonally arranged, wave-absorbing materials are coated outside each antenna, and a wave-absorbing partition plate is additionally arranged between the transceiving antenna group A and the transceiving antenna group B.
(III) advantageous effects
Compared with the prior art, the high-isolation miniaturized cross-eye interference system implementation method provided by the invention has the following advantages:
(1) through the measures of orthogonal polarization, wave-absorbing material coating, wave-absorbing partition plate addition and the like of the transmitting-receiving antenna group, and high-isolation design of the transmitting-receiving antenna group, the isolation between the transmitting-receiving antennas is greatly improved, so that the purpose of simultaneous transmitting and receiving work in a miniaturized cross eye interference system can be realized;
(2) amplitude and phase modulation is carried out on the digital signal, the digital signal is directly forwarded after modulation is finished, signal storage is not carried out, and a target echo and an interference signal are not divided into two signals by a radar;
(3) the invention provides a transmitting-receiving isolation design and a high-precision amplitude-phase correction method, which can simultaneously ensure the amplitude-phase precision and the interference effect.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic diagram of an interference signal generation path according to the present invention;
FIG. 2 is a simulation diagram of the isolation implementation of the receiving antenna and the transmitting antenna in the transceiving antenna group according to the present invention;
FIG. 3 is a simulation result of the isolation between two transceiving antenna groups in the present invention;
fig. 4 is a schematic diagram of cross-eye interference in the prior art.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A method for implementing a high-isolation miniaturized cross-eye interference system is disclosed, as shown in FIG. 1, and includes the following steps:
s1, designing the high isolation of the transmitting and receiving antenna group;
s2, generating a correction signal by using the signal processing module, and sending the correction signal to the radio frequency modules, wherein each radio frequency module is respectively coupled with a path of radio frequency signal and sends the radio frequency signal to another radio frequency module;
s3, the radio frequency module processes the received radio frequency signal and sends the radio frequency signal to the signal processing module, and the signal processing module obtains amplitude and phase calibration quantity through the loop signal and performs amplitude and phase correction;
and S4, after the receiving and transmitting antenna group receives the radar signal, the radar signal is subjected to phase inversion processing, the other receiving and transmitting antenna group is used for aiming at the radar for radiation, and meanwhile, the radar signal received by the other receiving and transmitting antenna group is used for aiming at the radar for radiation.
In S1, the high isolation design for the transmit-receive antenna group includes:
calculating the sensitivity Pr and the transmitting power Po of the receiver, and calculating the isolation requirement Isp according to the following formula:
Isp>Po-Pr+Dr。
the receiver sensitivity Pr is calculated according to:
Pr＝-114+10log10(B)+NF+Dr
wherein, B is the instantaneous bandwidth of the system, unit MHz, NF is the noise coefficient of the receiver, and Dr is the detection signal-to-noise ratio.
Taking the example that the transmitting power Po is 10W, the signal bandwidth B is 1000MHz, the noise coefficient NF of the receiver is 10, and the detection signal-to-noise ratio Dr is 13, the sensitivity Pr of the receiver is-61 dBm, and the isolation degree is required to satisfy the Isp of more than 88 dB.
In the technical scheme of the application, as shown in fig. 2, the transceiving antenna group comprises a transceiving antenna group a and a transceiving antenna group B which have the same structure, the polarization directions of the two transceiving antennas inside the transceiving antenna group a and the transceiving antenna group B are all orthogonally placed, the isolation degree is increased through orthogonal polarization, each antenna is externally coated with a wave-absorbing material, and a wave-absorbing partition plate is additionally arranged between the transceiving antenna group a and the transceiving antenna group B.
As shown in FIG. 3, the isolation between the horn antennas of 2-18GHz spaced by 0.5m can be up to 98dB or more by the high isolation design method, which meets the requirement of Isp >88dB in the above example.
In S2, the generating the calibration signal by the signal processing module and sending the calibration signal to the rf module includes:
the FPGA in the signal processing module generates 2 paths of baseband correction signals, the baseband correction signals are converted into intermediate frequency signals after digital up-conversion and digital-to-analog converters, and the intermediate frequency signals are respectively sent to the transmitting channels of the 2 radio frequency modules.
In S2, each rf module respectively couples out a rf signal and sends the rf signal to another rf module, including:
the intermediate frequency signal is converted into a radio frequency signal after being mixed and amplified in the radio frequency module, and each radio frequency module is coupled with one path of radio frequency signal respectively and is sent into a receiving channel of the other radio frequency module through a radio frequency cable.
The radio frequency module in S3 processes the received radio frequency signal, and sends the processed radio frequency signal to the signal processing module, including:
the radio frequency module carries out down-conversion after receiving radio frequency signals through switch switching, the radio frequency signals are changed into intermediate frequency signals, and the intermediate frequency signals are sent into the signal processing module through the radio frequency cable, and receiving of 2 loop correction signals is completed.
In S3, the signal processing module obtains an amplitude-phase calibration quantity through the loop signal, and performs amplitude-phase correction, including:
the signal processing module takes one of the loop signals as a reference to obtain the amplitude and phase adjustment CR1 of the other loop signal;
calculating the magnitude phase calibration quantity according to the following formula:
the amplitude-phase calibration quantity is CR1+ CR 2;
CR2 is the amplitude and phase adjustment amount of the antenna and the phase-stable cable not included in the calibration loop, and is obtained by a darkroom internal test.
In the technical scheme, amplitude and phase modulation is carried out on the digital signals, the signals are directly transmitted after the modulation is finished, signal storage is not carried out, and it is ensured that target echoes and interference signals are not divided into two signals by a radar. More importantly, the invention provides a receiving and transmitting isolation design and a high-precision amplitude and phase correction method, which can simultaneously ensure the amplitude and phase precision and the interference effect.
After the receiving and transmitting antenna group receives the radar signal, the radar signal is subjected to phase inversion processing, the other receiving and transmitting antenna group is used for aiming at the radar for radiation, and meanwhile the radar signal received by the other receiving and transmitting antenna group is used for aiming at the radar for radiation.
Fig. 4 shows a schematic diagram of cross-eye interference in the prior art. After receiving radar signals, receiving antennas of the receiving and transmitting antenna groups are subjected to down-conversion processing by the radio frequency module, intermediate frequency signals are sent to the signal processing module to be subjected to digital-to-analog conversion, and then are sent to the radio frequency module to be subjected to up-conversion and amplification and then are sent to a transmitting antenna of the other receiving and transmitting antenna group to aim at radar radiation.
After receiving the radar signal, the receiving antenna of the other receiving and transmitting antenna group carries out the above process except phase inversion on the received signal through the radio frequency module and the signal processing module, and the transmitting antenna of the receiving and transmitting antenna group aims at the radar radiation.
Interference signals transmitted by transmitting antennas of the two groups of transmitting and receiving antenna groups generate distorted phase wave fronts after being subjected to phase inversion superposition at radars, and stable cross eye interference is formed.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (9)
1. A method for realizing a high-isolation miniaturized cross-eye interference system is characterized by comprising the following steps: the method comprises the following steps:
s1, designing the high isolation of the transmitting and receiving antenna group;
s2, generating a correction signal by using the signal processing module, and sending the correction signal to the radio frequency modules, wherein each radio frequency module is respectively coupled with a path of radio frequency signal and sends the radio frequency signal to another radio frequency module;
s3, the radio frequency module processes the received radio frequency signal and sends the radio frequency signal to the signal processing module, and the signal processing module obtains amplitude and phase calibration quantity through the loop signal and performs amplitude and phase correction;
and S4, after the receiving and transmitting antenna group receives the radar signal, the radar signal is subjected to phase inversion processing, the other receiving and transmitting antenna group is used for aiming at the radar for radiation, and meanwhile, the radar signal received by the other receiving and transmitting antenna group is used for aiming at the radar for radiation.
2. The method of claim 1, wherein the method comprises: in S1, the high isolation design for the transmit-receive antenna group includes:
calculating the sensitivity Pr and the transmitting power Po of the receiver, and calculating the isolation requirement Isp according to the following formula:
Isp>Po-Pr+Dr。
3. the method of claim 2, wherein the method comprises: the receiver sensitivity Pr is calculated according to the following formula:
Pr＝-114+10log10(B)+NF+Dr
wherein, B is the instantaneous bandwidth of the system, unit MHz, NF is the noise coefficient of the receiver, and Dr is the detection signal-to-noise ratio.
4. The method of claim 1, wherein the method comprises: in S2, the generating the calibration signal by the signal processing module and sending the calibration signal to the rf module includes:
the FPGA in the signal processing module generates 2 paths of baseband correction signals, the baseband correction signals are converted into intermediate frequency signals after digital up-conversion and digital-to-analog converters, and the intermediate frequency signals are respectively sent to the transmitting channels of the 2 radio frequency modules.
5. The method of claim 4, wherein the method comprises: in S2, each rf module respectively couples out a rf signal and sends the rf signal to another rf module, including:
the intermediate frequency signal is converted into a radio frequency signal after being mixed and amplified in the radio frequency module, and each radio frequency module is coupled with one path of radio frequency signal respectively and is sent into a receiving channel of the other radio frequency module through a radio frequency cable.
6. The method of claim 5, wherein the method comprises: the radio frequency module in S3 processes the received radio frequency signal, and sends the processed radio frequency signal to the signal processing module, including:
the radio frequency module carries out down-conversion after receiving radio frequency signals through switch switching, the radio frequency signals are changed into intermediate frequency signals, and the intermediate frequency signals are sent into the signal processing module through the radio frequency cable, and receiving of 2 loop correction signals is completed.
7. The method of claim 6, wherein the method comprises: in S3, the signal processing module obtains an amplitude-phase calibration quantity through the loop signal, and performs amplitude-phase correction, including:
the signal processing module takes one of the loop signals as a reference to obtain the amplitude and phase adjustment CR1 of the other loop signal;
calculating the magnitude phase calibration quantity according to the following formula:
the amplitude-phase calibration quantity is CR1+ CR 2;
CR2 is the amplitude and phase adjustment amount of the antenna and the phase-stable cable not included in the calibration loop, and is obtained by a darkroom internal test.
8. The method of claim 1, wherein the method comprises: in S4, after the transceiving antenna group receives the radar signal, the radar signal is processed in reverse phase, and the other transceiving antenna group is directed to the radar radiation, and the radar signal received by the other transceiving antenna group is directed to the radar radiation by the transceiving antenna group, including:
after receiving radar signals, receiving antennas of the transceiving antenna groups are subjected to down-conversion processing by the radio frequency module, intermediate frequency signals are sent to the signal processing module for digitalization and reverse phase processing, then digital-to-analog conversion is carried out in the signal processing module, the intermediate frequency signals are sent to the radio frequency module for up-conversion and amplification, and then are sent to a transmitting antenna of the other transceiving antenna group to aim at radar radiation;
after receiving the radar signal, the receiving antenna of the other transceiving antenna group carries out the process processing except phase inversion on the received signal through the radio frequency module and the signal processing module, and the transmitting antenna of the transceiving antenna group aims at the radar radiation;
interference signals transmitted by transmitting antennas of the two groups of transmitting and receiving antenna groups generate distorted phase wave fronts after being subjected to phase inversion superposition at radars, and stable cross eye interference is formed.
9. The method for implementing a high-isolation miniaturized cross-eye interference system according to any one of claims 1-8, wherein: the receiving and transmitting antenna group comprises a receiving and transmitting antenna group A and a receiving and transmitting antenna group B which are identical in structure, the polarization directions of the two receiving and transmitting antennas in the receiving and transmitting antenna group A and the receiving and transmitting antenna group B are both orthogonally arranged, the outside of each antenna is coated with a wave-absorbing material, and a wave-absorbing partition plate is additionally arranged between the receiving and transmitting antenna group A and the receiving and transmitting antenna group B.
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