CN111458684B - Two-point source coherent angle interference system and method - Google Patents
Two-point source coherent angle interference system and method Download PDFInfo
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- CN111458684B CN111458684B CN202010421006.1A CN202010421006A CN111458684B CN 111458684 B CN111458684 B CN 111458684B CN 202010421006 A CN202010421006 A CN 202010421006A CN 111458684 B CN111458684 B CN 111458684B
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- 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
- G01S7/38—Jamming means, e.g. producing false echoes
Abstract
The invention discloses a two-point source coherent angle interference system and a two-point source coherent angle interference method, and relates to the technical field of radar signal processing. Wherein, this system includes: the device comprises a first receiving link, a second receiving link, a first transmitting link, a second transmitting link and a control module; the first receiving link and the second receiving link are both provided with a receiving antenna and a microwave receiver and are used for receiving radar signals; the control module is used for generating an interference signal according to the received radar signal and dividing the interference signal into two paths which are respectively output to the first transmitting link and the second transmitting link; the control module is also used for adjusting the output phase difference and the output power of the interference signals transmitted by the two transmission links; the first and second transmitting chains are provided with microwave transmitters and transmitting antennas for transmitting the adjusted interference signals. Through the system, the effect of coherent angle interference of the two point sources is improved.
Description
Technical Field
The invention relates to the technical field of radar signal processing, in particular to a two-point source coherent angle interference system and a two-point source coherent angle interference method.
Background
The radar detection aims at obtaining information such as speed, distance and direction of a detected target, two-point source coherent angle interference is the most effective mode for destroying detection of target direction information by the radar, two interference point sources distributed in a space are used for transmitting interference signals, the two interference signals have a fixed phase relationship, coherent synthesis is carried out in the space, serious wave front phase distortion can be generated on the surface of an antenna opening of the radar, and therefore an angle tracking system of the monopulse radar is influenced.
The existing two-point source coherent angle interference implementation scheme mainly has two types: the first technical solution is shown in fig. 1, which uses two independent signal forwarding channels, so two pairs of transmitting and receiving antennas separated by a certain distance are required, and a 180-degree inverter is disposed in one of the channels. When a radar signal enters the system at a certain angle, the radar signal is transmitted through the two transmission channels to form an interference signal, the interference signal forms reverse phase superposition in the radar incoming wave direction, and the judgment of the radar angle measuring system on the signal arrival direction can be destroyed by the superposition effect, so that the angle interference effect is achieved; the second technical scheme is as shown in fig. 2, and the second technical scheme is that an independent receiving antenna is adopted to receive radar signals, the received radar signals are sent to a digital signal processing system, the digital signal processing system generates interference signals, the interference signals are divided into two paths, and the two paths of interference signals are transmitted through two independent transmitting antennas, wherein one path of interference signals is provided with a broadband adjustable phase shifter, 180-degree phase shift can be generated in a wide frequency band range, the effect of phase inversion superposition of the transmitting signals is achieved, and angle interference is implemented on a radar.
In the process of implementing the present invention, the inventor of the present invention finds that the existing two-point source coherent angle interference scheme has the following problems: the first solution, although theoretically simple, has some limitations in practical use. Firstly, the bandwidth of the 180-degree inverter is limited, and the inversion can be realized only in a narrow range, while the interference system is generally a broadband system, so the method has use limitation; secondly, the two microwave transceiving channels only play a role in receiving and forwarding, and do not have transceiving time sequence control, so that the problem of signal phase deviation caused by different transceiving delays can exist; and thirdly, the receiving antenna and the transmitting antenna are close to each other and are in a simultaneous working state, so that the crosstalk between the receiving and transmitting antennas is difficult to avoid, and the system cannot work normally. The second solution solves the problem of the timing control and the narrow bandwidth of the method for transmitting and receiving signals shown in fig. 1, but it also has the following problems: firstly, the method can only generate 180-degree phase shift in a certain direction of the perpendicular bisector of the two-point source, so that the method can only generate an angle interference effect aiming at the radar in a certain direction right ahead or right behind, and the usability of the method is limited; secondly, in the method, the two microwave transmitters have different gains, so that the radiation signal amplitudes of the two point sources are unequal, and the angle interference effect is influenced.
Therefore, in view of the above disadvantages, it is desirable to provide a new two-point source coherent angle interference system and method.
Disclosure of Invention
Technical problem to be solved
The invention aims to solve the technical problems of limited use, poor interference effect and the like of the conventional two-point source coherent angle interference scheme.
(II) technical scheme
In order to solve the above technical problem, in one aspect, the present invention provides a two-point source coherent angle interference system.
The two-point source coherent angle interference system comprises: the device comprises a first receiving link, a second receiving link, a first transmitting link, a second transmitting link and a control module; the first receiving link and the second receiving link are both provided with a receiving antenna and a microwave receiver and are used for receiving radar signals and sending one path of radar signals to the control module; the control module is used for generating an interference signal according to the received radar signal, dividing the interference signal into two paths, outputting one path of interference signal to the first transmitting link, and outputting the other path of interference signal to the second transmitting link; the control module is further configured to control the adjustable phase shifter disposed in at least one of the first transmission link and the second transmission link, so as to adjust an output phase difference of the interference signals transmitted by the two transmission links; the control module is further configured to control the adjustable attenuator arranged in at least one of the first transmission link and the second transmission link, so as to adjust output power of the interference signal transmitted by the two transmission links; the first transmitting chain and the second transmitting chain are also provided with microwave transmitters and transmitting antennas for transmitting the adjusted interference signals.
Optionally, at least one of the first receiving link and the second receiving link is further provided with an adjustable attenuator; the control module is further used for setting the attenuation value of the adjustable attenuator in the transmitting link to be the maximum value when the radar signal is received; the control module is further configured to set an attenuation value of an adjustable attenuator in the receiving link to a maximum value when the interference signal is transmitted.
Optionally, the system further comprises: a phase discrimination comparator; the phase discrimination comparator is used for measuring the phase difference of the radar signals output by the first receiving link and the second receiving link and outputting the phase difference to the control module; the control module is used for adjusting the adjustable phase shifter in the transmitting link according to the phase difference of the radar signals output by the first receiving link and the second receiving link and the inherent output signal phase difference between the first transmitting link and the second transmitting link, so that the output phase difference of the interference signals transmitted by the two transmitting links reaches a preset value.
Optionally, the system further comprises: the device comprises a signal down-conversion module and a signal up-conversion module; the signal down-conversion module is used for performing down-conversion on the radar signal to obtain an intermediate frequency signal before sending one path of radar signal to the control module; the control module is used for generating a modulation signal according to the intermediate frequency signal; and the signal up-conversion module is used for up-converting the modulation signal to obtain an interference signal and dividing the interference signal into two paths.
Optionally, the output phase difference of the interference signals transmitted by the two transmission links is 180 °.
Optionally, the output power ratio of the interference signals transmitted by the two transmission links is 1.
Optionally, the control module is a digital signal processing system.
In order to solve the above technical problem, in another aspect, the present invention further provides a two-point source coherent angle interference method.
The two-point source coherent angle interference method comprises the following steps: receiving radar signals through a first receiving link and a second receiving link, and sending one path of radar signals to a control module; the first receiving chain and the second receiving chain are both provided with a receiving antenna and a microwave receiver; the control module generates an interference signal according to a received radar signal, divides the interference signal into two paths, outputs one path of interference signal to a first transmitting link and outputs the other path of interference signal to a second transmitting link; the control module controls an adjustable phase shifter arranged on at least one of the first transmission link and the second transmission link so as to adjust the output phase difference of interference signals transmitted by the two transmission links; the control module controls the adjustable attenuator arranged on at least one of the first transmission link and the second transmission link so as to adjust the output power of the interference signals transmitted by the two transmission links; and transmitting the adjusted interference signal through a microwave transmitter and a transmitting antenna which are arranged on the first transmitting link and the second transmitting link.
Optionally, at least one of the first receiving link and the second receiving link is further provided with an adjustable attenuator; the method further comprises the following steps: when a radar signal is received, setting the attenuation value of an adjustable attenuator in a transmitting link to be a maximum value through the control module; and when the interference signal is transmitted, setting the attenuation value of the adjustable attenuator in the receiving link to be the maximum value through the control module.
Optionally, the method further comprises: measuring the phase difference of radar signals output by a first receiving link and a second receiving link through a phase discrimination comparator, and outputting the phase difference to the control module; the control module adjusts the output phase difference of the interference signals transmitted by the two transmission links, and comprises the following steps: the control module adjusts the adjustable phase shifter in the transmitting link according to the phase difference of the radar signals output by the first receiving link and the second receiving link and the inherent output signal phase difference between the first transmitting link and the second transmitting link, so that the output phase difference of the interference signals transmitted by the two transmitting links reaches a preset value.
(III) advantageous effects
The technical scheme of the invention has the following advantages: the invention provides a two-point source coherent angle interference system, which comprises: the device comprises a first receiving link, a second receiving link, a first transmitting link, a second transmitting link and a control module; the first receiving link and the second receiving link are both provided with a receiving antenna and a microwave receiver and are used for receiving radar signals and sending the radar signals to the control module; the control module is used for generating two paths of interference signals according to the two paths of received radar signals and respectively outputting the interference signals to the first transmitting link and the second transmitting link; the control module is also used for adjusting the output phase difference and the output power of the interference signals transmitted by the two transmission links; the first and second transmitting chains are provided with microwave transmitters and transmitting antennas for transmitting the adjusted interference signals. Through the system, the problems of limited use, poor interference effect and the like of the conventional two-point source coherent angle interference scheme are solved, so that two-point source interference signals have high coherence, and the effect of coherent angle interference of the two-point sources is improved.
Drawings
FIG. 1 is a schematic diagram of a two-point source coherent angle interference implementation in the first prior art;
FIG. 2 is a schematic diagram of a two-point source coherent angle interference implementation in the second prior art;
FIG. 3 is a schematic diagram of a two-point source coherent angle interference system according to a first embodiment of the present invention;
FIG. 4 is a schematic diagram of a two-point source coherent angle interference system according to a second embodiment of the present invention;
fig. 5 is a schematic diagram of a two-point source coherent angle interference method according to a third embodiment of the present invention.
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, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example one
Fig. 3 is a schematic diagram of a two-point source coherent angle interference system according to a first embodiment of the present invention. As shown in fig. 3, the two-point source coherent angle interference system provided by the embodiment of the present invention includes: a first receiving chain 100, a second receiving chain 200, a control module 300, a first transmitting chain 400 and a second transmitting chain 500.
The first receiving link 100 and the second receiving link 200 are both provided with a receiving antenna and a microwave receiver, and are configured to receive radar signals and send one of the radar signals to the control module 300. For example, a radar signal received by the first receive link may be sent to the control module; or the radar signal received by the second receive link may be sent to the control module.
The microwave receivers arranged in the first receiving chain 100 and the second receiving chain 200 are mainly used for amplitude limiting, filtering and amplifying radar signals received by the receiving antennas. In an alternative example, the operating frequency range of the microwave receiver may be in the range of 2GHz to 18GHz in order to better accommodate the operating frequency range of the radar signal.
The control module 300 is configured to generate an interference signal according to one received radar signal, divide the interference signal into two paths, output one of the interference signals to the first transmitting link 400, and output the other interference signal to the second transmitting link 500.
In an alternative example, the control module 300 may employ a digital signal processing system. After receiving the radar signal sent by the first receiving link 100 or the second receiving link 200, the control module 300 may process the radar signal based on a digital radio frequency storage technology to generate an interference signal; moreover, the control module may divide the interference signal into two paths, and send one path of the interference signal to the first transmitting link 400 and send the other path of the interference signal to the second transmitting link 500.
The first transmission chain 400 and the second transmission chain 500 are provided with an adjustable phase shifter, an adjustable attenuator, a microwave transmitter and a transmission antenna. The adjustable phase shifters and the adjustable attenuators arranged in the first transmission link 400 and the second transmission link 500 may be controlled by the control module 300 in real time, so as to adjust the phase and the output power between the interference signals transmitted by the two transmission links; the first transmission chain 400 and the second transmission chain 500 are provided with microwave transmitters and transmission antennas for transmitting the adjusted interference signals. In specific implementation, parameters such as control response time, adjustment precision and adjustment range of the adjustable phase shifter and the adjustable attenuator can be selected according to actual use requirements of the interference system. In an alternative example, to better ensure the real-time performance of radar signal reception and interference signal transmission switching, the control response time of the adjustable phase shifter is not greater than 200 nanoseconds.
In another embodiment of the present invention, an adjustable phase shifter may be provided in any of the first transmission chain 400 and the second transmission chain 500, and an adjustable attenuator may also be provided in any of the first transmission chain 400 and the second transmission chain 500.
The control module 300 is further configured to control the adjustable phase shifters disposed in the first transmission link 400 and the second transmission link 500, so as to adjust the output phase difference of the interference signals transmitted by the two transmission links.
In an optional example, the adjusting, by the control module 300, the output phase difference of the interference signals transmitted by the two transmission links specifically includes: the control module 300 adjusts the phase shifter in the transmission link according to the phase difference Δ θ of the radar signals output by the first receiving link 100 and the second receiving link 200 and the inherent output signal phase difference Δ ψ between the first transmission link 400 and the second transmission link 500, so that the output phase difference of the interference signals transmitted by the two transmission links reaches a preset value. The preset value of the output phase difference can be 180 degrees or-180 degrees, and can also be other values adjusted according to factors such as interference signal forms or delay differences of two microwave transmitters.
The control module 300 is further configured to control adjustable attenuators disposed in the first transmission link 400 and the second transmission link 500, so as to adjust output powers of the interference signals transmitted by the two transmission links.
In an optional example, the adjusting, by the control module 300, the output power of the interference signal transmitted by the two transmission links specifically includes: the control module 300 adjusts the adjustable attenuator in the transmitting link according to the output signal power ratio α of the two transmitting links, which is measured in advance, so that the ratio of the output powers of the interference signals transmitted by the two transmitting links reaches a preset value. The preset value of the ratio of the output power can be 1, or other values adjusted according to factors such as the form of interference signals, the precision of an adjustable attenuator, or the power difference of two microwave transmitters.
In the system provided by the embodiment of the invention, the double receiving links are adopted to receive radar signals, the double transmitting links transmit interference signals, the adjustable attenuator and the adjustable phase shifter are arranged on the transmitting links and are used for compensating the phase difference and the power difference of the interference signals output by the control module on the two transmitting links, and the phase difference and the power ratio of the two paths of interference signals can be dynamically adjusted according to different interference signal forms, so that the problems of limited use, poor interference effect and the like of the conventional two-point-source coherent angle interference scheme are solved, the two-point-source interference signals have strong coherence, the effect of coherent angle interference of the two points of sources is improved, and the system has strong flexibility and practicability.
Example two
Fig. 4 is a schematic diagram of a two-point source coherent angle interference system according to a second embodiment of the present invention. As shown in fig. 4, the two-point source coherent angle interference system provided by the embodiment of the present invention includes: the device comprises a first receiving chain 100, a second receiving chain 200, a control module 300, a first transmitting chain 400, a second transmitting chain 500, a phase detection comparator 600, a signal down-conversion module 700 and a signal up-conversion module 800.
In the embodiment of the present invention, the first receiving chain 100 includes: a receiving antenna 1, an adjustable attenuator and a microwave receiver; the second receiving chain 200 comprises: a receiving antenna 2, an adjustable attenuator and a microwave receiver. In addition, in another embodiment of the present invention, an adjustable attenuator may be disposed in any one of the first receiving chain 100 and the second receiving chain 200. Wherein the adjustable attenuator on the receive chain is controllable by the control module 300.
In an alternative embodiment, the adjustable attenuators in the first 100 and second 200 receive chains are placed between the receive antennas and the microwave receiver (as shown in fig. 4). In this optional embodiment, the receiving antenna 1 and the receiving antenna 2 receive radar signals, two paths of radar signals enter the microwave receiver through the adjustable attenuators on the receiving links, output signals of the microwave receiver on the two paths of receiving links enter the phase discrimination comparator 600, and an output signal of the microwave receiver on one path of receiving link enters the signal down-conversion module 700.
In another alternative embodiment, the adjustable attenuators in the first 100 and second 200 receive chains may also be located after the receive antennas and microwave receivers. In the optional embodiment, the receiving antenna 1 and the receiving antenna 2 receive radar signals, and the two paths of radar signals firstly pass through a microwave receiver on a receiving link and then enter an adjustable attenuator; the output signals of the adjustable attenuators in the two receiving links enter the phase detection comparator 600, and the output signal of the adjustable attenuator in one of the receiving links enters the signal down-conversion module 700.
The phase detection comparator 600 is configured to measure a phase difference between the radar signals output by the first receiving link 100 and the second receiving link 200, and output the phase difference to the control module 300. The input signal of the phase detection comparator 600 is a radar signal output by two receiving links, the output signal of the phase detection comparator 600 is a phase difference of two microwave signals, and the phase difference may be a digitally quantized signal or an analog voltage signal.
The signal down-conversion module 700 is configured to down-convert the radar signal on one receiving link before sending the radar signal to the control module 300, so as to obtain an intermediate frequency signal. The frequency of the intermediate frequency signal generated by the signal down-conversion module can be selected according to the sampling rate of the control module. For example, it may be a zero intermediate frequency signal or a non-zero intermediate frequency signal. In an alternative example, the maximum frequency of the intermediate frequency signal generated by the signal down-conversion module may be made not greater than 500MHz, taking into account the data processing capability of the control module.
And a control module 300, configured to generate a modulation signal according to the intermediate frequency signal. Illustratively, the control module 300 may employ a digital signal processing system. Further, the digital signal processing system may include devices such as an analog-to-digital converter, a programmable logic device, and a digital-to-analog converter, so as to perform functions such as analog signal reception, digital signal transmission, and external device control. In specific implementation, the sampling rate of the digital signal processing system can be selected according to the intermediate frequency signal selected by the signal up-conversion and the signal down-conversion.
The signal up-conversion module 800 is configured to up-convert the modulated signal to obtain an interference signal, divide the interference signal into two paths, output one path of the interference signal to the first transmitting link 400, and output the other path of the interference signal to the second transmitting link 500.
The first transmission chain 400 includes: the device comprises an adjustable attenuator, an adjustable phase shifter, a microwave transmitter and a transmitting antenna 1; the second transmit chain 500 comprises: adjustable attenuator, adjustable phase shifter, microwave transmitter, and transmitting antenna 2. The adjustable phase shifter and the adjustable attenuator in the two transmission links can be controlled by the control module 300 in real time to adjust the phase and the output power between the interference signals transmitted by the two transmission links.
In an alternative embodiment, an adjustable attenuator, an adjustable phase shifter, a microwave transmitter, and a transmitting antenna are sequentially disposed in the first transmitting chain 400 and the second transmitting chain 500. In this optional embodiment, the two interference signals output by the signal up-conversion module 800 sequentially pass through the adjustable attenuator and the adjustable phase shifter on the transmission link and then enter the microwave transmitter, and then the two interference signals output by the microwave transmitter are transmitted through the transmission antenna.
In another alternative embodiment, a microwave transmitter, an adjustable attenuator, an adjustable phase shifter, and a transmitting antenna are sequentially disposed in the first transmitting chain 400 and the second transmitting chain 500. In this optional embodiment, the two interference signals output by the signal up-conversion module 800 are sequentially transmitted through the transmitting antenna after passing through the microwave transmitter, the adjustable attenuator, and the adjustable phase shifter on the transmitting link.
The control module 300 is further configured to set an attenuation value of an adjustable attenuator in the transmission link to a maximum value when receiving the radar signal; and a control module 300, further configured to set an attenuation value of the adjustable attenuator in the receiving link to a maximum value when the interference signal is transmitted. By arranging the adjustable attenuators on the receiving link and the transmitting link and controlling the operation of the control module, the crosstalk of the transmitting and receiving antennas can be effectively prevented, and the performance of an interference system is improved.
In specific implementation, when the control module 300 performs switching control on the adjustable attenuators in the receiving link and the transmitting link, the control module may transmit an interference signal after receiving a complete radar signal; and the radar signal can be received and transmitted at the same time, namely the radar signal is received and the interference signal is transmitted and switched in real time. In an alternative example, in order to better ensure the effectiveness of interference, the switching time for receiving radar signals and transmitting interference signals can be not more than 3 microseconds, and the switching time can be dynamically adjusted.
The control module 300 is further configured to control the adjustable phase shifters disposed in the first transmission link 400 and the second transmission link 500, so as to adjust the output phase difference of the interference signals transmitted by the two transmission links.
In an optional example, the adjusting, by the control module 300, the output phase difference of the interference signals transmitted by the two transmission links specifically includes: the control module 300 adjusts the adjustable phase shifters in the two transmission links according to the phase difference Δ θ of the radar signals output by the first receiving link 100 and the second receiving link 200 measured by the phase detector comparator and the inherent output signal phase difference Δ ψ between the first transmission link 400 and the second transmission link 500 measured in advance (where the measured links may include a signal up-conversion module, a transmission adjustable attenuator, an adjustable phase shifter, a microwave transmitter, and a transmission antenna), so that the output phase difference of the interference signals transmitted by the two transmission links reaches a preset value. The preset value of the output phase difference can be 180 degrees or-180 degrees, and can also be other values adjusted according to factors such as interference signal forms or delay differences of two microwave transmitters.
The control module 300 is further configured to control adjustable attenuators disposed in the first transmission link 400 and the second transmission link 500, so as to adjust output powers of the interference signals transmitted by the two transmission links.
In an optional example, the adjusting, by the control module 300, the output power of the interference signal transmitted by the two transmission links specifically includes: the control module 300 adjusts the adjustable attenuator in the transmitting link according to the output signal power ratio α of the two transmitting links, which is measured in advance, so that the ratio of the output powers of the interference signals transmitted by the two transmitting links reaches a preset value. The preset value of the ratio of the output power can be 1, or other values adjusted according to factors such as the form of interference signals, the precision of an adjustable attenuator, or the power difference of two microwave transmitters.
In the system provided by the embodiment of the invention, the double receiving links are adopted to receive radar signals, the double transmitting links transmit interference signals, the adjustable attenuator and the adjustable phase shifter are arranged on the transmitting links and are used for compensating the phase difference and the power difference of the interference signals output by the control module on the two transmitting links, and the phase difference and the power ratio of the two paths of interference signals can be dynamically adjusted according to different interference signal forms, so that the problems of limited use, poor interference effect and the like of the conventional two-point-source coherent angle interference scheme are solved, the two-point-source interference signals have strong coherence, the effect of coherent angle interference of the two points of sources is improved, and the system has strong flexibility and practicability.
EXAMPLE III
Fig. 5 is a schematic diagram of a two-point source coherent angle interference method according to a third embodiment of the present invention. As shown in fig. 5, the method for interfering with the two point sources relative angle provided by the embodiment of the present invention includes:
and S101, receiving radar signals through the first receiving link and the second receiving link, and sending one path of radar signals to the control module.
The first receiving link and the second receiving link are provided with receiving antennas and microwave receivers and used for receiving radar signals and sending one path of radar signals to the control module. For example, a radar signal received by the first receive link may be sent to the control module; or the radar signal received by the second receive link may be sent to the control module.
The microwave receivers arranged in the first receiving chain 100 and the second receiving chain 200 are mainly used for amplitude limiting, filtering and amplifying radar signals received by the receiving antennas. In an alternative example, the operating frequency range of the microwave receiver may be in the range of 2GHz to 18GHz in order to better accommodate the operating frequency range of the radar signal.
Step S102, the control module generates an interference signal according to the received radar signal, divides the interference signal into two paths, outputs one path of the interference signal to the first transmitting link, and outputs the other path of the interference signal to the second transmitting link.
In an alternative example, the control module may employ a digital signal processing system. After receiving the radar signal sent by the first receiving link or the second receiving link, the control module can process the radar signal based on a digital radio frequency storage technology to generate an interference signal; and the control module can divide the interference signal into two paths, send one path of interference signal to the first transmitting link and send the other path of interference signal to the second transmitting link.
Step S103, the control module controls the adjustable phase shifter disposed in at least one of the first transmission link and the second transmission link to adjust the output phase difference of the interference signals transmitted by the two transmission links.
In an alternative embodiment, the first and second transmission chains are each provided with a tunable phase shifter. The adjustable phase shifters arranged on the first transmission link and the second transmission link can be controlled by the control module in real time to adjust the phase between the interference signals transmitted by the two transmission links. In another alternative embodiment, a tunable phase shifter may be provided in either of the first and second transmit chains. In specific implementation, parameters such as control response time, adjustment precision and adjustment range of the adjustable phase shifter can be selected according to actual use requirements of the interference system. In an alternative example, to better ensure the real-time performance of radar signal reception and interference signal transmission switching, the control response time of the adjustable phase shifter is not greater than 200 nanoseconds.
In an optional example, the adjusting, by the control module, the output phase difference of the interference signals transmitted by the two transmission links specifically includes: the control module adjusts the adjustable phase shifter in the transmitting link according to the phase difference delta theta of the radar signals output by the first receiving link and the second receiving link and the inherent output signal phase difference delta psi between the first transmitting link and the second transmitting link, so that the output phase difference of the interference signals transmitted by the two transmitting links reaches a preset value. The preset value of the output phase difference can be 180 degrees or-180 degrees, and can also be other values adjusted according to factors such as interference signal forms or delay differences of two microwave transmitters.
Step S104, the control module controls the adjustable attenuator arranged in at least one of the first transmission link and the second transmission link to adjust the output power of the interference signal transmitted by the two transmission links.
In an alternative embodiment, the first and second transmission chains are each provided with an adjustable attenuator. In another alternative embodiment, an adjustable attenuator may be provided in either of the first and second transmit chains. In specific implementation, parameters such as control response time, adjustment precision, adjustment range and the like of the adjustable attenuator can be selected according to actual use requirements of the interference system. In an alternative example, in order to better ensure the real-time performance of radar signal receiving and interference signal transmitting switching, the control response time of the adjustable attenuator is not more than 200 nanoseconds.
In an optional example, the adjusting, by the control module, the output power of the interference signal transmitted by the two transmission links specifically includes: the control module adjusts the adjustable attenuator in the transmitting link according to the output signal power ratio alpha of the two transmitting links which is measured in advance, so that the output power ratio of the interference signals transmitted by the two transmitting links reaches a preset value. The preset value of the ratio of the output power can be 1, or other values adjusted according to factors such as the form of interference signals, the precision of an adjustable attenuator, or the power difference of two microwave transmitters.
And step S105, transmitting the adjusted interference signal through a microwave transmitter and a transmitting antenna which are arranged on the first transmitting link and the second transmitting link.
In the method provided by the embodiment of the invention, the double receiving links are adopted to receive radar signals, the double transmitting links transmit interference signals, and the adjustable attenuator and the adjustable phase shifter are arranged on the transmitting links and are used for compensating the phase difference and the power difference of the interference signals output by the control module on the two transmitting links, and the phase difference and the power ratio of the two paths of interference signals can be dynamically adjusted according to different interference signal forms, so that the problems of limited use, poor interference effect and the like of the conventional two-point-source coherent angle interference scheme are solved, the two-point-source interference signals have strong coherence, the effect of coherent angle interference of the two points of sources is improved, and the method has strong flexibility and practicability.
Finally, it should be noted that: 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; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. A two-point source coherent angle jamming system, the system comprising: the device comprises a first receiving link, a second receiving link, a first transmitting link, a second transmitting link and a control module;
the first receiving link and the second receiving link are both provided with a receiving antenna and a microwave receiver and are used for receiving radar signals and sending one path of radar signals to the control module;
the control module is used for generating an interference signal according to the received radar signal, dividing the interference signal into two paths, outputting one path of the interference signal to the first transmitting link, and outputting the other path of the interference signal to the second transmitting link;
the control module is further configured to control the adjustable phase shifter disposed in at least one of the first transmission link and the second transmission link, so as to adjust an output phase difference of the interference signals transmitted by the two transmission links; the control module is further configured to control the adjustable attenuator arranged in at least one of the first transmission link and the second transmission link, so as to adjust output power of the interference signal transmitted by the two transmission links;
the first transmitting link and the second transmitting link are also provided with a microwave transmitter and a transmitting antenna for transmitting the adjusted interference signal;
at least one of the first receiving link and the second receiving link is also provided with an adjustable attenuator;
the control module is further used for setting the attenuation value of the adjustable attenuator in the transmitting link to be the maximum value when the radar signal is received; the control module is further configured to set an attenuation value of an adjustable attenuator in a receiving link to a maximum value when the interference signal is transmitted;
the system further comprises: a phase discrimination comparator;
the phase discrimination comparator is used for measuring the phase difference of the radar signals output by the first receiving link and the second receiving link and outputting the phase difference to the control module;
the control module is used for adjusting the adjustable phase shifter in the transmitting link according to the phase difference of the radar signals output by the first receiving link and the second receiving link and the inherent output signal phase difference between the first transmitting link and the second transmitting link, so that the output phase difference of the interference signals transmitted by the two transmitting links reaches a preset value.
2. The system of claim 1, further comprising: the device comprises a signal down-conversion module and a signal up-conversion module;
the signal down-conversion module is used for performing down-conversion on the radar signal to obtain an intermediate frequency signal before sending one path of radar signal to the control module;
the control module is used for generating a modulation signal according to the intermediate frequency signal;
and the signal up-conversion module is used for up-converting the modulation signal to obtain an interference signal and dividing the interference signal into two paths.
3. The system of claim 1 wherein the two transmit chains transmit interfering signals whose outputs are 180 ° out of phase.
4. The system of claim 1 wherein the output power ratio of the interference signals transmitted by the two transmit chains is 1.
5. The system of claim 1, wherein the control module is a digital signal processing system.
6. A two-point source coherent angle interference method is characterized by comprising the following steps:
receiving radar signals through a first receiving link and a second receiving link, and sending one path of radar signals to a control module; the first receiving chain and the second receiving chain are both provided with a receiving antenna and a microwave receiver;
the control module generates an interference signal according to a received radar signal, divides the interference signal into two paths, outputs one path of interference signal to a first transmitting link and outputs the other path of interference signal to a second transmitting link;
the control module controls an adjustable phase shifter arranged on at least one of the first transmission link and the second transmission link so as to adjust the output phase difference of interference signals transmitted by the two transmission links; the control module controls the adjustable attenuator arranged on at least one of the first transmission link and the second transmission link so as to adjust the output power of the interference signals transmitted by the two transmission links;
transmitting the adjusted interference signal through a microwave transmitter and a transmitting antenna which are arranged on a first transmitting link and a second transmitting link;
at least one of the first receiving link and the second receiving link is also provided with an adjustable attenuator; the method further comprises the following steps:
when a radar signal is received, setting the attenuation value of an adjustable attenuator in a transmitting link to be a maximum value through the control module; when an interference signal is transmitted, the attenuation value of the adjustable attenuator in the receiving link is set to be the maximum value through the control module;
the method further comprises the following steps:
measuring the phase difference of radar signals output by a first receiving link and a second receiving link through a phase discrimination comparator, and outputting the phase difference to the control module;
the control module adjusts the output phase difference of the interference signals transmitted by the two transmission links, and comprises the following steps: the control module adjusts the adjustable phase shifter in the transmitting link according to the phase difference of the radar signals output by the first receiving link and the second receiving link and the inherent output signal phase difference between the first transmitting link and the second transmitting link, so that the output phase difference of the interference signals transmitted by the two transmitting links reaches a preset value.
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