CN110932739B - A system and method for reducing communication and radar excitation signal error interference - Google Patents
A system and method for reducing communication and radar excitation signal error interference Download PDFInfo
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Abstract
本发明公开了一种降低通信和雷达激励信号误差干扰的系统及方法，该系统可以保留传统反向散射通信和雷达系统中常用的射频干扰对消模块，使得系统在接收终端反馈信号的同时不容易被激励终端的射频信号或其它射频信号所饱和。该系统可以不用高精度时钟源，降低了发射器和系统的成本和功耗；同时通过数字干扰消除子系统的构建，灵活调节时延相位的尺寸参数，降低无线通信信道的多普勒效应和多径效应对输入信号的干扰，从而提高终端反馈信号的信噪比，提高发射器到终端的激励距离，减小对射频干扰对消模块精度和性能的要求，同时通过兼容射频干扰对消模块来增强系统的适应性，适用于收发一体和收发分离架构的反向散射通信和雷达侦测。
The invention discloses a system and method for reducing the error interference of communication and radar excitation signals. The system can retain the radio frequency interference cancellation module commonly used in traditional backscatter communication and radar systems, so that the system does not receive feedback signals from terminals at the same time. Easily saturated by radio frequency signals or other radio frequency signals that excite the terminal. The system does not need a high-precision clock source, which reduces the cost and power consumption of the transmitter and the system; at the same time, through the construction of a digital interference cancellation subsystem, the size parameters of the delay phase can be flexibly adjusted to reduce the Doppler effect and the wireless communication channel. The multipath effect interferes with the input signal, thereby improving the signal-to-noise ratio of the terminal feedback signal, increasing the excitation distance from the transmitter to the terminal, and reducing the requirements for the accuracy and performance of the radio frequency interference cancellation module. To enhance the adaptability of the system, it is suitable for backscatter communication and radar detection with integrated transceiver and transceiver separation architecture.
Description
Technical Field
The invention belongs to the field of wireless communication, and particularly relates to a system and a method for reducing error interference of communication and radar excitation signals.
Background
In order to reduce complexity, cost and power consumption of the communication terminal of the internet of things and increase deployment density of the terminal, it is generally desirable to perform internet of things communication (such as RFID) in a backscattering communication mode, and the working principle of the communication terminal is similar to that of a radar reflected signal. Because the high-power-consumption radio frequency module for active transmission is removed, the cost and the power consumption of the communication terminal are greatly reduced by the backscattering communication, and the method has wide application prospect.
If the backscatter communication or radar is to be implemented, one of the main problems is that the target terminal does not actively transmit a radio frequency signal but reflects a radio frequency excitation signal, and the energy of a terminal feedback signal superimposed on the target terminal is much lower than that of the excitation signal due to the distance between the excitation signal source and the terminal, so that the excitation signal is an interference at a receiving end relative to the terminal feedback signal. How to remove this interference is a key factor in the realization of backscatter communications or radar.
For backscatter communications or radar, a variety of signals may be employed as the radio frequency excitation signal. The radio frequency excitation signal interference is not only the excitation signal itself, but also interference caused by various errors of the excitation signal, such as phase noise, frequency offset, spatial multipath and other errors of the excitation signal. In order to identify the terminal feedback signal, the terminal feedback signal usually has a certain difference from the excitation signal itself in frequency, time, phase and amplitude, so that the excitation signal itself is usually easier to cancel at the receiving end, but because the phase noise, frequency offset, spatial multipath and other errors of the excitation signal and the terminal feedback signal may be at the same frequency and the same time, the terminal feedback signal is usually much smaller in energy than the excitation signal, the phase noise, frequency offset, spatial multipath and other errors of the excitation signal are not easy to cancel at the receiving end, and the terminal feedback signal can generate large interference, resulting in a reduction in signal-to-noise ratio, and limiting the excitation distance from the transmitter to the terminal.
In order to reduce interference of radio frequency excitation signal errors in backscatter communication or radar detection and improve the distance from a transmitter to a terminal, in the prior art, a high-precision clock source is generally adopted, and the high-precision clock source comprises a high-precision crystal oscillator, a high-precision VCO and a PLL, so that an excitation signal generated by an excitation signal source has smaller errors such as phase noise, frequency offset and the like.
The technical scheme has the problems of high cost and large power consumption of the radio frequency circuit at the excitation end.
In order to reduce the interference of the radio frequency excitation signal error in the backscatter communication or radar detection and increase the distance from the transmitter to the terminal, the prior art generally adopts the radio frequency interference cancellation technology. The technology introduces a copied high-precision excitation signal (usually, a receiver and a transmitter share a clock source and correspond to a receiving-transmitting integrated radar and a backscattering communication receiving-transmitting common station, or transmits the copied excitation signal through wired connection and correspond to a receiving-transmitting separated radar and backscattering communication receiving-transmitting separated framework), and adjusts the time delay and the amplitude of the copied excitation signal on an analog radio frequency circuit, so that the amplitude of the copied excitation signal is the same as that of an excitation signal received by an air interface and the phase of the copied excitation signal is opposite to that of the excitation signal received by the air interface, thereby simultaneously reducing the interference of the excitation signal, phase noise and frequency offset.
The technical scheme has the problems that the precision of an analog radio frequency delay and amplitude regulating circuit is limited, the condition of multi-amplitude multi-delay/phase is difficult to realize, and the elimination of phase noise and frequency offset errors of radio frequency excitation signals is difficult to realize, so that even if the radio frequency excitation signals are eliminated, the incidental errors of the radio frequency excitation signals are still possibly larger, the signal-to-noise ratio of terminal feedback signals can be reduced, and the corresponding radio frequency devices have higher cost, larger volume and poorer integration level.
Disclosure of Invention
Aiming at the defects in the prior art, the system and the method for reducing the error interference of the communication and radar excitation signals solve the problem that the radio frequency excitation of the transmitter generates large interference on the feedback signals of the terminal.
In order to achieve the above object, the present invention adopts a technical solution of a system for reducing error interference of communication and radar excitation signals, comprising: a receiver and a transmitter;
the receiver is respectively in communication connection with the transmitter and the terminal;
the terminal is in communication connection with the transmitter.
Further: the receiver includes: the device comprises a digital processor, a first ADC acquisition module, a second ADC acquisition module, a filter and a receiving antenna;
the digital processor is respectively connected with the output end of the first ADC acquisition module and the output end of the second ADC acquisition module;
the input end of the first ADC acquisition module is respectively connected with the output end of the filter and the input end of the second ADC acquisition module;
the input end of the filter is connected with the receiving antenna;
the transmitter includes: a frequency source and a frequency converter;
the output end of the frequency source is connected with the input end of the frequency converter;
the frequency source is used for respectively transmitting radio frequency excitation to the frequency converter, the terminal and the receiving antenna;
the terminal is used for receiving the radio frequency excitation, generating a feedback signal according to the received radio frequency excitation and sending the feedback signal to the receiving antenna;
the frequency converter is used for generating second radio frequency excitation with different frequency with the radio frequency excitation according to the received radio frequency excitation and transmitting the second radio frequency excitation to the receiving antenna in a wireless communication mode;
the receive antenna is configured to receive the radio frequency excitation, the feedback signal, and the second radio frequency excitation.
Further: the receiver includes: the device comprises a digital processor, a first ADC acquisition module, a second ADC acquisition module and a receiving antenna;
the digital processor is respectively connected with the output end of the first ADC acquisition module and the output end of the second ADC acquisition module;
the input end of the second ADC acquisition module is connected with a receiving antenna;
the transmitter includes: a power divider and a frequency source;
the output end of the frequency source is connected with the input end of the power divider;
the frequency source is used for respectively transmitting radio frequency excitation to the power divider, the terminal and the receiving antenna;
the terminal is used for receiving radio frequency excitation, generating a feedback signal by the received radio frequency excitation and sending the feedback signal to the receiving antenna;
the power divider is used for generating a first radio frequency excitation with the same frequency as the radio frequency excitation according to the received radio frequency excitation and transmitting the first radio frequency excitation to the first ADC acquisition module in a wired communication mode;
the receiving antenna is used for receiving radio frequency excitation and feedback signals.
Further: the receiver includes: the device comprises a digital processor, a first ADC acquisition module, a second ADC acquisition module, a first filter, a second filter, a first receiving antenna and a second receiving antenna;
the digital processor is respectively connected with the output end of the first ADC acquisition module and the output end of the second ADC acquisition module;
the input end of the first ADC acquisition module is respectively connected with the output end of the first filter;
the input end of the first filter is connected with a first receiving antenna;
the input end of the second ADC acquisition module is connected with the output end of the second filter;
the input end of the second filter is connected with a second receiving antenna;
the transmitter includes: a frequency converter and a frequency source;
the output end of the frequency source is connected with the input end of the frequency converter;
the frequency source is used for respectively sending radio frequency excitation to the frequency converter, the terminal, the first receiving antenna and the second receiving antenna;
the frequency converter is used for generating second radio frequency excitation with different frequency with the radio frequency excitation according to the received radio frequency excitation and transmitting the second radio frequency excitation to the first receiving antenna and the second receiving antenna in a wireless communication mode;
the terminal is used for receiving radio frequency excitation, generating a feedback signal according to the received radio frequency excitation and respectively sending the feedback signal to the first receiving antenna and the second receiving antenna;
the first receiving antenna is used for receiving radio frequency excitation, second radio frequency excitation and feedback signals;
the second receive antenna is configured to receive a second radio frequency excitation, a radio frequency excitation, and a feedback signal.
Further: the digital processor includes: the device comprises an equalizer, an amplitude delay adjuster, a processing unit, a demodulator and an error processing unit;
the output end of the equalizer is connected with the first input end of the amplitude delay regulator, and the input end of the equalizer is connected with the output end of the error processing unit;
the output end of the amplitude delay regulator is connected with the first input end of the processing unit, and the second input end of the amplitude delay regulator receives the output signal of the first AD acquisition module and designates the signal as a first input signal;
the output end of the processing unit is respectively connected with the input end of the demodulator and the input end of the error processing unit, and the second input end of the processing unit receives the output signal of the second AD acquisition module and designates the signal as a second input signal.
Further: the processing unit is a subtracter.
Further: the processing unit is a mixer.
A method of reducing communication and radar excitation signal error interference, comprising the steps of:
s1, the control terminal does not transmit a feedback signal, and the first input signal is input into the amplitude delay regulator to carry out amplitude and delay regulation to obtain reference excitation;
s2, inputting the second input signal and the reference excitation into a processing unit for processing to obtain a residual signal;
s3, inputting the residual error signal into an error processing unit, and iterating the residual error signal by adopting an error calculation method to obtain an error signal;
s4, inputting the error signal into an equalizer for equalization operation to obtain an iteration control signal;
s5, adjusting the amplitude and the phase of the reference excitation through the iteration control signal;
s6, judging whether the error signal is smaller than a set threshold value, if so, keeping the scale parameters of the amplitude and the phase of the iterative control signal regulation reference excitation unchanged, completing the construction of the digital interference elimination subsystem, and jumping to the step S7, otherwise, jumping to S1;
s7, the second input signal carrying the terminal feedback signal is processed by the digital interference elimination subsystem, and the interference of the Doppler effect and the multipath effect of the wireless communication channel to the second input signal is reduced.
Further: the error calculation method in step S3 includes: a spectral analysis method and a filtering method.
A radio frequency interference cancellation module in a traditional backscattering communication and radar system can be reserved in the system, so that a terminal feedback signal received by the system is not easily saturated by fourth radio frequency excitation.
The system does not need to adopt a high-precision clock source, and reduces the cost and the power consumption of the transmitter.
Meanwhile, through the construction of the digital interference elimination subsystem, the size parameter of the time delay phase is flexibly adjusted, and the interference of the Doppler effect and the multipath effect of a wireless communication channel on an input signal is reduced, so that the signal-to-noise ratio of a terminal feedback signal is improved, the excitation distance from a transmitter to a terminal is improved, the requirements on the precision and the performance of a radio frequency interference cancellation module are reduced, meanwhile, the adaptability of the system is enhanced through the compatible radio frequency interference cancellation module, and the method is suitable for the backscatter communication and radar detection of a receiving-transmitting integrated structure and a receiving-transmitting separated structure.
Drawings
FIG. 1 is a block diagram of a system of embodiment 1;
FIG. 2 is a block diagram of a system of embodiment 2;
FIG. 3 is a block diagram of a system of embodiment 3;
FIG. 4 is a block diagram of a system of embodiment 4;
FIG. 5 is a block diagram of a system of embodiment 5;
FIG. 6 is a block diagram of a system of embodiment 6;
fig. 7 is a system block diagram of a digital interference cancellation subsystem.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
A system for reducing communication and radar excitation signal error interference, comprising: a receiver and a transmitter;
the receiver is respectively in communication connection with the transmitter and the terminal;
the terminal is in communication connection with the transmitter.
Example 1:
as shown in fig. 1, the receiver includes: the device comprises a digital processor, a first ADC acquisition module, a second ADC acquisition module, a filter and a receiving antenna;
the digital processor is respectively connected with the output end of the first ADC acquisition module and the output end of the second ADC acquisition module;
the input end of the first ADC acquisition module is respectively connected with the output end of the filter and the input end of the second ADC acquisition module;
the input end of the filter is connected with the receiving antenna;
the transmitter includes: a frequency source and a frequency converter;
the output end of the frequency source is connected with the input end of the frequency converter;
the frequency source is used for respectively transmitting radio frequency excitation to the frequency converter, the terminal and the receiving antenna;
the terminal is used for receiving the radio frequency excitation, generating a feedback signal according to the received radio frequency excitation and sending the feedback signal to the receiving antenna;
the frequency converter is used for generating second radio frequency excitation with different frequency with the radio frequency excitation according to the received radio frequency excitation and transmitting the second radio frequency excitation to the receiving antenna in a wireless communication mode;
the receive antenna is configured to receive the radio frequency excitation, the feedback signal, and the second radio frequency excitation.
The frequency source transmits radio frequency excitation, the receiving antennas of the terminal and the receiver can receive the radio frequency excitation, and useful signals are feedback signals transmitted by the terminal according to the received radio frequency excitation, so the radio frequency excitation received by the receiver is interference to the feedback signals, therefore, the frequency converter is adopted to convert the radio frequency excitation into second radio frequency excitation different in frequency with the radio frequency excitation, the receiving antennas receive the second radio frequency excitation, the feedback signals and the radio frequency excitation, then the second radio frequency excitation is sent to the filter, the second radio frequency excitation is separated out by the filter and then sent to the first ADC acquisition module, signals carrying the feedback signals and the radio frequency excitation are sent to the second ADC acquisition module, and the first ADC acquisition module and the second ADC acquisition module send the signals to the digital processor for processing.
Example 2:
as shown in fig. 2, the receiver includes: the device comprises a digital processor, a first ADC acquisition module, a second ADC acquisition module and a receiving antenna;
the digital processor is respectively connected with the output end of the first ADC acquisition module and the output end of the second ADC acquisition module;
the input end of the second ADC acquisition module is connected with a receiving antenna;
the transmitter includes: a power divider and a frequency source;
the output end of the frequency source is connected with the input end of the power divider;
the frequency source is used for respectively transmitting radio frequency excitation to the power divider, the terminal and the receiving antenna;
the terminal is used for receiving radio frequency excitation, generating a feedback signal by the received radio frequency excitation and sending the feedback signal to the receiving antenna;
the power divider is used for generating a first radio frequency excitation with the same frequency as the radio frequency excitation according to the received radio frequency excitation and transmitting the first radio frequency excitation to the first ADC acquisition module in a wired communication mode;
the receiving antenna is used for receiving radio frequency excitation and feedback signals.
The frequency source transmits radio frequency excitation, the power divider copies the radio frequency excitation to obtain first radio frequency excitation, and the first radio frequency excitation is transmitted to the first ADC acquisition module in a wired mode; the terminal receives the radio frequency excitation and transmits a feedback signal according to the radio frequency excitation; the receiving antenna receives the radio frequency excitation and feedback signals, sends the radio frequency excitation and feedback signals to the second ADC acquisition module, and acquires the signals through the second ADC acquisition module and the first ADC acquisition module and sends the signals to the digital processor.
Example 3:
as shown in fig. 3, the receiver includes: the device comprises a digital processor, a first ADC acquisition module, a second ADC acquisition module, a first filter, a second filter, a first receiving antenna and a second receiving antenna;
the digital processor is respectively connected with the output end of the first ADC acquisition module and the output end of the second ADC acquisition module;
the input end of the first ADC acquisition module is respectively connected with the output end of the first filter;
the input end of the first filter is connected with a first receiving antenna;
the input end of the second ADC acquisition module is connected with the output end of the second filter;
the input end of the second filter is connected with a second receiving antenna;
the transmitter includes: a frequency converter and a frequency source;
the output end of the frequency source is connected with the input end of the frequency converter;
the frequency source is used for respectively sending radio frequency excitation to the frequency converter, the terminal, the first receiving antenna and the second receiving antenna;
the frequency converter is used for generating second radio frequency excitation with different frequency with the radio frequency excitation according to the received radio frequency excitation and transmitting the second radio frequency excitation to the first receiving antenna and the second receiving antenna in a wireless communication mode;
the terminal is used for receiving radio frequency excitation, generating a feedback signal according to the received radio frequency excitation and respectively sending the feedback signal to the first receiving antenna and the second receiving antenna;
the first receiving antenna is used for receiving radio frequency excitation, second radio frequency excitation and feedback signals;
the second receive antenna is configured to receive a second radio frequency excitation, a radio frequency excitation, and a feedback signal.
The frequency source transmits radio frequency excitation, the terminal generates a feedback signal according to the received radio frequency excitation, and the frequency converter generates second radio frequency excitation according to the received radio frequency excitation; the second receiving antenna receives the second radio frequency excitation, the feedback signal and the radio frequency excitation and sends the second radio frequency excitation, the feedback signal and the radio frequency excitation to the second filter; the first receiving antenna receives the radio frequency excitation, the second radio frequency excitation and the feedback signal, and then for the feedback signal, the radio frequency excitation received by the second receiving antenna is an interference signal; the first receiving antenna sends the received signal to a first filter, the first filter filters out radio frequency excitation and a feedback signal, and only outputs second radio frequency excitation; the second filter receives second radio frequency excitation, a feedback signal and radio frequency excitation output by the second receiving antenna, the second filter filters the second radio frequency excitation, and the signal carrying the feedback signal and the radio frequency excitation is sent to the second ADC acquisition module; and the digital processor processes the digital signals transmitted by the second ADC acquisition module and the first ADC acquisition module.
Example 4:
as shown in fig. 4, the receiver includes: the device comprises a digital processor, a first ADC acquisition module, a second ADC acquisition module, a filter, a radio frequency interference cancellation module and a receiving antenna;
the digital processor is respectively connected with the output end of the first ADC acquisition module and the output end of the second ADC acquisition module;
the input end of the first ADC acquisition module is respectively connected with the output end of the filter, the first input end of the radio frequency interference cancellation module and the input end of the second ADC acquisition module;
the input end of the filter is connected with the output end of the radio frequency interference cancellation module;
the second input end of the radio frequency interference cancellation module is connected with a receiving antenna;
the transmitter includes: a frequency source and a frequency converter;
the output end of the frequency source is connected with the input end of the frequency converter;
the frequency source is used for respectively transmitting radio frequency excitation to the frequency converter, the terminal and the receiving antenna;
the terminal is used for receiving the radio frequency excitation, generating a feedback signal according to the received radio frequency excitation and sending the feedback signal to the receiving antenna;
the frequency converter is used for generating second radio frequency excitation with different frequency with the radio frequency excitation according to the received radio frequency excitation and transmitting the second radio frequency excitation to the receiving antenna in a wireless communication mode;
the receive antenna is configured to receive the radio frequency excitation, the feedback signal, and the second radio frequency excitation.
The frequency source transmits radio frequency excitation, the receiving antennas of the terminal and the receiver can both receive the radio frequency excitation, and the useful signal is a feedback signal transmitted by the terminal according to the received radio frequency excitation, so the radio frequency excitation received by the receiver is interference to the feedback signal, therefore, the frequency converter is adopted to convert the radio frequency excitation into second radio frequency excitation with different frequency, the receiving antenna receives the second radio frequency excitation, the feedback signal and the radio frequency excitation and then transmits the second radio frequency excitation to the radio frequency interference cancellation module, the partial interference of Doppler effect and multipath effect of a wireless communication channel to the signal is reduced, the second radio frequency excitation is separated by the filter and then respectively transmitted to the first ADC acquisition module and the radio frequency interference cancellation module as a reference signal of the radio frequency interference cancellation module, and the signal carrying the feedback signal and the radio frequency excitation is transmitted to the second ADC acquisition module, the first ADC acquisition module and the second ADC acquisition module send signals to the digital processor for processing.
Example 5:
as shown in fig. 5, the receiver includes: the device comprises a digital processor, a first ADC acquisition module, a second ADC acquisition module, a radio frequency interference cancellation module and a receiving antenna;
the digital processor is respectively connected with the output end of the first ADC acquisition module and the output end of the second ADC acquisition module;
the input end of the first ADC acquisition module is connected with the first input end of the radio frequency interference cancellation module;
the input end of the second ADC acquisition module is connected with the output end of the radio frequency interference cancellation module;
the second input end of the radio frequency interference cancellation module is connected with a receiving antenna;
the transmitter includes: a power divider and a frequency source;
the output end of the frequency source is connected with the input end of the power divider;
the frequency source is used for respectively transmitting radio frequency excitation to the power divider, the terminal and the receiving antenna;
the terminal is used for receiving radio frequency excitation, generating a feedback signal by the received radio frequency excitation and sending the feedback signal to the receiving antenna;
the power divider is used for generating first radio frequency excitation with the same frequency as the radio frequency excitation according to the received radio frequency excitation and transmitting the first radio frequency excitation to the first ADC acquisition module and the radio frequency interference cancellation module in a wired communication mode;
the receiving antenna is used for receiving radio frequency excitation and feedback signals.
The frequency source transmits radio frequency excitation, the power divider copies the radio frequency excitation to obtain first radio frequency excitation, and transmits the first radio frequency excitation to the first ADC acquisition module and the radio frequency interference cancellation module in a wired mode; the first radio frequency excitation is used as a reference signal of a radio frequency interference cancellation module; the terminal receives the radio frequency excitation and transmits a feedback signal according to the radio frequency excitation; the receiving antenna receives the radio frequency excitation and the feedback signal and sends the radio frequency excitation and the feedback signal to the radio frequency interference cancellation module, the radio frequency interference cancellation module can eliminate partial interference of Doppler effect and multipath effect of a wireless communication channel of the input signal, the received signal is sent to the second ADC acquisition module after being processed, and the signal is acquired by the second ADC acquisition module and the first ADC acquisition module and sent to the digital processor.
Example 6:
as shown in fig. 6, the receiver includes: the device comprises a digital processor, a first ADC acquisition module, a second ADC acquisition module, a first filter, a second filter, a radio frequency interference cancellation module, a first receiving antenna and a second receiving antenna;
the digital processor is respectively connected with the output end of the first ADC acquisition module and the output end of the second ADC acquisition module;
the input end of the first ADC acquisition module is respectively connected with the output end of the first filter and the first input end of the radio frequency interference cancellation module;
the input end of the first filter is connected with a first receiving antenna;
the input end of the second ADC acquisition module is connected with the output end of the radio frequency interference cancellation module;
the second input end of the radio frequency interference cancellation module is connected with the output end of the second filter;
the input end of the second filter is connected with a second receiving antenna;
the transmitter includes: a frequency converter and a frequency source;
the output end of the frequency source is connected with the input end of the frequency converter;
the frequency source is used for respectively sending radio frequency excitation to the frequency converter, the terminal, the first receiving antenna and the second receiving antenna;
the frequency converter is used for generating second radio frequency excitation with different frequency with the radio frequency excitation according to the received radio frequency excitation and transmitting the second radio frequency excitation to the first receiving antenna and the second receiving antenna in a wireless communication mode;
the terminal is used for receiving radio frequency excitation, generating a feedback signal according to the received radio frequency excitation and respectively sending the feedback signal to the first receiving antenna and the second receiving antenna;
the first receiving antenna is used for receiving radio frequency excitation, second radio frequency excitation and feedback signals;
the second receive antenna is configured to receive a second radio frequency excitation, a radio frequency excitation, and a feedback signal.
The frequency source transmits radio frequency excitation, the terminal generates a feedback signal according to the received radio frequency excitation, and the frequency converter generates second radio frequency excitation according to the received radio frequency excitation; the second receiving antenna receives the second radio frequency excitation, the feedback signal and the radio frequency excitation and sends the second radio frequency excitation, the feedback signal and the radio frequency excitation to the radio frequency interference cancellation module; the first receiving antenna receives the radio frequency excitation, the second radio frequency excitation and the feedback signal, and then for the feedback signal, the radio frequency excitation received by the second receiving antenna is an interference signal; the first receiving antenna sends the received signal to a first filter, the first filter filters out radio frequency excitation and a feedback signal, only outputs second radio frequency excitation, and respectively outputs the second radio frequency excitation to a first ADC acquisition module and a radio frequency interference cancellation module, and the second radio frequency excitation after passing through the first filter is used as a reference signal of the radio frequency interference cancellation module; the second filter receives second radio frequency excitation, a feedback signal and the radio frequency excitation output by the second receiving antenna, the second radio frequency excitation is filtered out through the second filter, the signal carrying the feedback signal and the radio frequency excitation is sent to the radio frequency interference cancellation module, partial interference on the signal is eliminated through the radio frequency interference cancellation module, and then the signal is sent to the second ADC acquisition module; and the digital processor processes the digital signals transmitted by the second ADC acquisition module and the first ADC acquisition module.
As shown in FIG. 7, the digital processor described in the system for embodiments 1 to 6 includes: the device comprises an equalizer, an amplitude delay adjuster, a processing unit, a demodulator and an error processing unit;
the output end of the equalizer is connected with the first input end of the amplitude delay regulator, and the input end of the equalizer is connected with the output end of the error processing unit;
the output end of the amplitude delay regulator is connected with the first input end of the processing unit, and the second input end of the amplitude delay regulator receives the output signal of the first AD acquisition module and designates the signal as a first input signal;
the output end of the processing unit is respectively connected with the input end of the demodulator and the input end of the error processing unit, and the second input end of the processing unit receives the output signal of the second AD acquisition module and designates the signal as a second input signal.
The processing unit is a subtracter or a mixer.
The embodiment of the invention also provides a method for reducing error interference of communication and radar excitation signals, which comprises the following steps:
s1, the control terminal does not transmit a feedback signal, and the first input signal is input into the amplitude delay regulator to carry out amplitude and delay regulation to obtain reference excitation;
s2, inputting the second input signal and the reference excitation into a processing unit for processing to obtain a residual signal;
s3, inputting the residual error signal into an error processing unit, and iterating the residual error signal by adopting an error calculation method to obtain an error signal;
s4, inputting the error signal into an equalizer for equalization operation to obtain an iteration control signal;
s5, adjusting the amplitude and the phase of the reference excitation through the iteration control signal;
s6, judging whether the error signal is smaller than a set threshold value, if so, keeping the scale parameters of the amplitude and the phase of the iterative control signal regulation reference excitation unchanged, completing the construction of the digital interference elimination subsystem, and jumping to the step S7, otherwise, jumping to S1;
s7, the second input signal carrying the terminal feedback signal is processed by the digital interference elimination subsystem, and the interference of the Doppler effect and the multipath effect of the wireless communication channel to the second input signal is reduced.
The error calculation method in step S3 includes: a spectral analysis method and a filtering method.
The invention has the beneficial effects that: a radio frequency interference cancellation module in a traditional backscattering communication and radar system can be reserved in the system, so that a terminal feedback signal received by the system is not easily saturated by fourth radio frequency excitation.
The system does not need to adopt a high-precision clock source, and reduces the cost and the power consumption of the transmitter.
Meanwhile, through the construction of the digital interference elimination subsystem, the size parameter of the time delay phase is flexibly adjusted, and the interference of the Doppler effect and the multipath effect of a wireless communication channel on an input signal is reduced, so that the signal-to-noise ratio of a terminal feedback signal is improved, the excitation distance from a transmitter to a terminal is improved, the requirements on the precision and the performance of a radio frequency interference cancellation module are reduced, meanwhile, the adaptability of the system is enhanced through the compatible radio frequency interference cancellation module, and the method is suitable for the backscatter communication and radar detection of a receiving-transmitting integrated structure and a receiving-transmitting separated structure.
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