CN117233701A - Radar radio frequency receiving method and radar radio frequency system adapting to strong clutter environment - Google Patents
Radar radio frequency receiving method and radar radio frequency system adapting to strong clutter environment Download PDFInfo
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- CN117233701A CN117233701A CN202311160421.6A CN202311160421A CN117233701A CN 117233701 A CN117233701 A CN 117233701A CN 202311160421 A CN202311160421 A CN 202311160421A CN 117233701 A CN117233701 A CN 117233701A
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Abstract
The invention discloses a radar radio frequency receiving method and a radar radio frequency system adapting to a strong clutter environment, wherein an intermediate frequency signal generated by an RF transmitting link is divided into two paths, one path of signal is sent to a transmitting antenna, the other path of signal forms an inverse delay signal to be subjected to analog superposition with an echo signal, or the radar radio frequency system generates a clutter suppression signal to replace the inverse delay signal to be subjected to analog superposition with the echo signal, or the clutter suppression signal is subjected to analog superposition with the inverse delay signal and the echo signal, and then the signal is sent to the RF receiving link to suppress strong clutter in the echo signal. The system comprises an FPGA, an RF transmitting link, an RF receiving link, a power divider, an inverter, a delay line, a synthesizer and a clutter suppression signal transmitting link. The invention can directly subtract clutter by matching and suppressing the strong clutter in the echo signal, and realize the ultra-large dynamic linear matching receiving of analog and digital.
Description
Technical Field
The invention relates to the field of radar radio frequency systems, in particular to a radar radio frequency receiving method and a radar radio frequency system which are adaptive to a strong clutter environment.
Background
About nineties of the twentieth century, the united states first developed a hand-held detection radar which can penetrate through a wall of a building or other fixed object to detect a target behind the wall, and can warn when a life body moves behind the wall.
For the through-wall radar radio frequency system, the system generally comprises a receiving and transmitting active array surface for improving the transmitting energy and the receiving signal-to-noise ratio (SNR), wherein the active array surface comprises an RF transmitting link and an RF receiving link, the FPGA forms a transmitting signal through the RF transmitting link and sends the transmitting signal to a transmitting antenna, and an echo signal of a target is received through the receiving antenna and sent to the RF receiving link and finally sent to the FPGA through the RF receiving link. During transmitting, the transmitting wave beam synthesis of pitch angle in space azimuth is completed by configuring different transmitting wave waveform phases and transmitting time, and as the array is provided with multiple units, the energy after wave beam synthesis has great benefit during transmitting, and the detecting power is improved; meanwhile, the flexible and rapid scanning of the transmitting beam can be realized by configuring the transmitting delay and the initial phase of the array surface transmitting unit. During receiving, amplitude-phase weighting is carried out on the data of the receiving channel to realize receiving wave beams, and the target detection efficiency is improved.
The device must transmit and receive, when transmitting, the electromagnetic wave needs to pass through the wall, the energy attenuation is very big after the electromagnetic wave passes through the wall, the echo is reflected after the electromagnetic wave acts on the life body behind the wall, the echo also needs to pass through the wall and then is transmitted to the receiving antenna, the electromagnetic wave needs to pass through the wall twice in the process, and the energy of the echo reflected by the life body behind the wall is very small, so the electromagnetic wave energy really reaching the receiving antenna is very weak. On the other hand, when the electromagnetic wave is emitted to act on the wall for the first time, there is an emitted echo, the echo component is complex, the superposition of echo of all sections of the wall is realized, the echo energy is very high, the echo belongs to a strong signal, and the echo component which is not needed by the system is realized. In addition to the above components, other stationary (e.g., subsequent second wall, etc.) echoes are superimposed with multipath, etc., to form the actual echo signal. Therefore, the echo signals obtained in the through-wall radar radio frequency system actually comprise strong clutter signals and target weak echo signals, and target detection needs to be carried out by matching correlation from echoes according to the characteristic information of organisms.
Moreover, the RF transmitting link and the RF receiving link of the radar radio frequency system often need to work in a time-sharing manner or work simultaneously, wherein for an application scene similar to a wall penetrating radar, when the system works, due to the existence of a wall, echo signals have strong clutter related to a fixed distance, when the system works, all echo signals need to be received, pulse-to-pulse two-dimensional FFT is performed, characteristic information such as heartbeat of a living body is utilized to detect the living signals behind the wall, the application scene requires that the echo signals of the super-strong wall can be received simultaneously, and also requires that extremely weak living body echo information is required to be received, so that the RF receiving link needs to work in a linear state.
Because any device can cause nonlinear distortion in a saturated state, additional phase nonlinearity is generated, subsequent signal filtering and feature extraction are affected, the analog device is generally required to have larger input P-1 and output P-1 for analog radio frequency devices, and higher requirements are also provided for gain allocation of a receiving link, so that a high dynamic receiving link with low noise coefficient can be realized on the basis of reasonable design. Whereas for a digitizer device, especially an ADC, the ADC is required to have a high resolution and thus the challenge is even greater. In order to improve key technical indexes, a general system requires a high instantaneous bandwidth of operation, even reaching GHz or above, which requires that the ADC operates at a high sampling rate, and the resolution of the ADC is closely related to the sampling rate, and the higher the sampling rate is, the lower the resolution is, and the higher the power consumption, the price and the like are, which contradicts the application scene.
How to realize the ultra-large dynamic linear matching receiving of analog and digital under the premise of limited ADC resolution at present is the core content of the invention.
Disclosure of Invention
The invention provides a radar radio frequency receiving method and a radar radio frequency system adapting to a strong clutter environment, which are used for solving the problems that the radar radio frequency system used for application scenes such as through-wall radars in the prior art is limited by ADC resolution and can not realize ultra-large dynamic linear matching receiving of analog and digital.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the method comprises the steps of dividing an intermediate frequency signal generated by an RF transmitting link of a radar radio frequency system into two paths of signals, sending one path of signals to the transmitting antenna, inverting and delaying the other path of signals to form an inverted delay signal, carrying out analog superposition on the inverted delay signal and an echo signal, sending the inverted delay signal to an RF receiving link of the radar radio frequency system, and inhibiting strong clutter in the echo signal through the inverted delay signal, so that the strong clutter is matched and inhibited by the RF receiving link before dynamic saturation compression, and further realizing unsaturated linear operation of the RF receiving link.
Furthermore, a clutter suppression signal transmitting link is additionally arranged in the radar radio frequency system and is used for generating clutter suppression signals, after the clutter suppression signals replace the inverse delay signals to be subjected to analog superposition with echo signals, or after the clutter suppression signals are subjected to analog superposition with the inverse delay signals and the echo signals, the clutter suppression signals are sent to an RF receiving link of the radar radio frequency system, so that strong clutter in the echo signals is suppressed, and the unsaturated linear operation of the RF receiving link is realized.
Further, after the other path of signal separated by the intermediate frequency signal generated by the RF transmitting link is inverted and attenuated, the signal is delayed to form an inverted delay signal.
Further, the delay time when the delay is performed is adjusted according to the distance between the radar radio frequency system and the target.
Further, the RF transmit chain and the RF receive chain operate simultaneously or in a time-sharing manner.
Furthermore, the clutter suppression signal transmitting link supports digital predistortion compensation through FPGA digital baseband algorithm processing.
The radar radio frequency system comprises an FPGA, an RF transmitting link, an RF receiving link, a transmitting antenna and a receiving antenna, wherein the FPGA generates intermediate frequency signals through the RF transmitting link, the radar radio frequency system further comprises a power divider, an inverter, a delay line and a synthesizer, the power divider divides the intermediate frequency signals into two paths, one path of signals output by the power divider are transmitted to the transmitting antenna, the other path of signals output by the power divider are input to the inverter, signals output by the inverter are transmitted to the synthesizer through the delay line, echo signals received by the receiving antenna are transmitted to the synthesizer, and signals output by the synthesizer are transmitted to the FPGA through the RF receiving link.
Further, the device also comprises an attenuator, wherein a signal output by the inverter is sent to the attenuator, and a signal output by the attenuator is sent to the synthesizer through a delay line.
Further, the delay line is an adjustable delay line with adjustable delay time.
Further, the FPGA generates clutter suppression signals through the clutter suppression signal transmitting link, and the clutter suppression signals are sent to the synthesizer.
Compared with the prior art, the invention has the beneficial effects that:
in the invention, a single analog branch is used for dividing a transmitting signal into one path, and the transmitting signal is synthesized with an echo signal after inversion, attenuation and delay; the clutter suppression signal supporting digital predistortion compensation is realized in a single digital branch through an FPGA digital baseband algorithm, the ultra-large dynamic receiving requirement is realized through a single analog branch, a single digital branch and an analog branch combined with a digital branch method, the strong clutter application requirement is adapted, the clutter is directly subtracted by an RF receiving link through the matching suppression of the strong clutter in echo signals, the dynamic requirement of the receiving link is reduced, the use index requirement of a receiving link device is reduced, the whole RF receiving link does not need high input and output P-1, the distortion nonlinearity of the receiving signal is reduced, and the ultra-large dynamic linear matching receiving of analog and digital is realized on the premise of limited ADC resolution, so that the signal-to-noise ratio SNR of a radar receiving beam signal can be effectively improved.
Drawings
Fig. 1 is a schematic diagram of a radar radio frequency system according to an embodiment of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the following detailed description will be given with reference to the accompanying drawings and examples, by which the technical means are applied to solve the technical problem, and the implementation process for achieving the corresponding technical effects can be fully understood and implemented. The embodiment of the invention and the characteristics in the embodiment can be mutually combined on the premise of no conflict, and the formed technical scheme is within the protection scope of the invention.
It will be apparent that the described embodiments are merely some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It is noted that the terms "comprising" and "having" and any variations thereof in the description of the invention and the claims and the foregoing drawings are intended to cover non-exclusive inclusions.
As shown in fig. 1, the embodiment discloses a radar radio frequency system, which includes an FPGA, an RF transmitting link, an RF receiving link, a transmitting antenna T1, a receiving antenna T2, a low noise amplifier LNA, and a 1:2 power divider D, an inverting attenuator M, a delay line S, and a 1:3 synthesizer H, wherein:
the RF transmitting link comprises a digital-to-analog converter DAC1, a filtering mixing amplifying module L1 and a frequency converter PA1. The digital quantity input end of the digital-to-analog converter DAC is connected with the digital quantity output end of the FPGA, the filtering mixing amplification module L is composed of a filter, a mixer and an amplifier, the analog quantity output end of the digital-to-analog converter DAC is connected with the input end of the filtering mixing amplification module L, the output end of the filtering mixing amplification module L is connected with the input end of the frequency converter PA1, the output end of the frequency converter PA1 is connected with the input end of the power divider D, and one output end of the power divider D is connected with the transmitting antenna T1.
The inverting attenuator M consists of an inverter and an attenuator, the other output end of the power divider D is connected with the input end of the inverting attenuator M, and the output end of the inverting attenuator M is connected with one input end of the synthesizer H through a delay line S. The receiving antenna T2 is connected to an input of a low noise amplifier LNA, an output of which is connected to the other input of the synthesizer H.
The RF receiving link comprises an analog-to-digital converter ADC, a filtering mixing amplification module L2 and a frequency converter PA2, wherein the filtering mixing amplification module L2 is also composed of a filter, a mixer and an amplifier. The output end of the synthesizer H is connected with the input end of the frequency converter PA2, the output end of the frequency converter PA2 is connected with the input end of the filtering mixing amplifying module L2, the output end of the filtering mixing amplifying module L2 is connected with the analog input end of the analog-to-digital converter ADC, and the analog output end of the analog-to-digital converter ADC is connected with the analog input end of the FPGA.
In the RF transmitting link, the signal output by the FPGA is converted by the DAC1 to generate an intermediate frequency signal, and the intermediate frequency signal is filtered, mixed and amplified by the filtering mixing amplifying module L1 and then is sent to the frequency converter PA1, and then is sent to the power divider D after being converted by the frequency converter PA1.
The power divider D equally divides the input signal into two paths of identical signals, one path of the signals is sent to the transmitting antenna T1, the transmitting antenna T1 transmits the signals to a target such as a wall body, the other path of signals are formed after being attenuated in an inverted mode through the inverted attenuator M, and the signals are sent to the synthesizer H through the delay line S to form inverted delay signals.
The echo signal generated by the target is received by the receiving antenna T2 and then sent to the low-noise amplifier LNA, and is amplified by the low-noise amplifier LNA and then sent to the synthesizer H, so that the inverse delay signal and the echo signal are subjected to analog superposition through the synthesizer H. The signal output by the synthesizer H is sequentially subjected to frequency conversion by a frequency converter PA2 and filtering mixing amplification by a filtering mixing amplification module L2 in an RF receiving link, and then is sent to an FPGA after being converted by an analog-to-digital converter ADC.
In the radar radio frequency system of the embodiment, the delay line is a delay line with adjustable delay time, and the radar radio frequency system and targets with different intervals are suitable for the radar radio frequency system by adjusting the delay time.
As an improvement on the radar radio frequency system of the embodiment, a clutter suppression signal transmitting link is additionally arranged in the radar radio frequency system, and the clutter suppression signal transmitting link comprises a digital-to-analog converter DAC2, a filtering mixing amplifying module L3 and an amplifier. The digital quantity input end of the digital-to-analog converter DAC2 is connected with the digital quantity output end of the FPGA, the analog quantity output end of the digital-to-analog converter DAC2 is connected with the input end of the filtering mixing amplifying module L3, the output end of the filtering mixing amplifying module L3 is connected with the input end of the amplifier, and the output end of the amplifier is connected with the third input end of the synthesizer H. The FPGA generates clutter suppression signals of digital quantity and sends the clutter suppression signals into the digital-to-analog converter DAC2, the clutter suppression signals are converted into clutter suppression signals of analog quantity through the digital-to-analog converter DAC2, and the clutter suppression signals are sequentially filtered, mixed, amplified and amplified by the filtering, mixing and amplifying module L3 and then sent into the synthesizer H. And through FPGA digital baseband algorithm processing, the clutter suppression signal transmitting link supports digital predistortion compensation DPD.
The embodiment also discloses a radar radio frequency receiving method of the radar radio frequency system, which comprises the following steps:
and acquiring the measurement distance between the transmitting antenna T1 of the radar radio frequency system and the target, and if the acquired measurement distance is in the application range of the delay line S, adjusting the delay time of the delay line S to meet the measurement distance requirement between the transmitting antenna T1 of the radar radio frequency system and the target. And then the FPGA works, an intermediate frequency signal is generated through the RF transmitting link, the intermediate frequency signal is divided into two paths of signals through the power divider D, one path of signals is sent to the transmitting antenna T1, the other path of signals are subjected to inverse attenuation through the inverse attenuator M and then are delayed through the delay line S to form an inverse delay signal, and the inverse delay signal and an echo signal received by the receiving antenna T2 are subjected to simulation superposition through the synthesizer H and then are sent to the RF receiving link of the radar radio frequency system. The strong clutter in the echo signal is suppressed by the reverse delay signal, so that the strong clutter is matched and suppressed by the RF receiving link before dynamic saturation compression, and the target weak echo in the echo signal is sent into the FPGA by the RF receiving link, thereby realizing the unsaturated linear operation of the RF receiving link.
And if the acquired measurement distance exceeds the maximum distance in the application range of the delay line S, enabling the clutter suppression signal transmitting link to work, enabling the FPGA to generate clutter suppression signals through the clutter suppression signal transmitting link, and controlling the clutter suppression signals to replace the opposite-phase delay signals to be singly and simulatively overlapped with the echo signals through the synthesizer H, or controlling the clutter suppression signals, the opposite-phase delay signals and the echo signals to be simulatively overlapped through the synthesizer H and then sending the simulatively overlapped clutter suppression signals, the opposite-phase delay signals and the echo signals into the RF receiving link of the radar radio frequency system. The strong clutter in the echo signal is suppressed by the clutter suppression signal or the strong clutter in the echo signal is suppressed by the clutter suppression signal and the inverse delay signal, so that the strong clutter is matched and suppressed by the RF receiving link before dynamic saturation compression, and the target weak echo in the echo signal is sent to the FPGA by the RF receiving link, thereby realizing the unsaturated linear operation of the RF receiving link.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, and the examples described herein are merely illustrative of the preferred embodiments of the present invention and are not intended to limit the spirit and scope of the present invention. The individual technical features described in the above-described embodiments may be combined in any suitable manner without contradiction, and such combination should also be regarded as the disclosure of the present disclosure as long as it does not deviate from the idea of the present invention. The various possible combinations of the invention are not described in detail in order to avoid unnecessary repetition.
The present invention is not limited to the specific details of the above embodiments, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the protection scope of the present invention without departing from the scope of the technical concept of the present invention, and the technical content of the present invention is fully described in the claims.
Claims (10)
1. The radar radio frequency receiving method adapting to the strong clutter environment is characterized in that an intermediate frequency signal generated by an RF transmitting link of a radar radio frequency system is divided into two paths of signals, one path of signal is sent to a transmitting antenna, the other path of signal is inverted and delayed to form an inverted delay signal, the inverted delay signal and an echo signal are subjected to analog superposition and then sent to an RF receiving link of the radar radio frequency system, and the strong clutter in the echo signal is restrained through the inverted delay signal, so that the strong clutter is restrained by matching before dynamic saturation compression of the RF receiving link, and further unsaturated linear operation of the RF receiving link is realized.
2. The method for receiving radar radio frequency adapted to strong clutter environment according to claim 1, wherein a clutter suppression signal transmitting link is added in the radar radio frequency system for generating clutter suppression signals, and after the clutter suppression signals replace the inverse delay signals to be subjected to analog superposition with echo signals, or after the clutter suppression signals are subjected to analog superposition with the inverse delay signals and the echo signals, the clutter suppression signals are sent to an RF receiving link of the radar radio frequency system, so that strong clutter in the echo signals is suppressed, and unsaturated linear operation of the RF receiving link is realized.
3. The method for receiving radar radio frequency adapted to strong clutter according to claim 1 or 2, wherein the other signal divided by the intermediate frequency signal generated by the RF transmitting chain is delayed to form an inverted delay signal after being inverted and attenuated.
4. The radar radio frequency receiving method adapted to a strong clutter environment according to claim 1 or 2, wherein the delay time when the delay is performed is adjusted according to the distance between the radar radio frequency system and the target.
5. The radar radio frequency receiving method adapted to a strong clutter environment according to claim 1 or 2, wherein the RF transmitting link and the RF receiving link are operated simultaneously or time-division.
6. The method for receiving radar radio frequency adapted to strong clutter environment according to claim 2, wherein the clutter suppression signal transmitting link supports digital predistortion compensation by FPGA digital baseband algorithm processing.
7. The radar radio frequency system for realizing the radar radio frequency receiving method according to any one of claims 1-6, comprising an FPGA, an RF transmitting chain, an RF receiving chain, a transmitting antenna and a receiving antenna, wherein the FPGA generates intermediate frequency signals through the RF transmitting chain, the radar radio frequency system is characterized by further comprising a power divider, an inverter, a delay line and a synthesizer, the power divider divides the intermediate frequency signals into two paths, one path of signals output by the power divider is transmitted to the transmitting antenna, the other path of signals output by the power divider are input to the inverter, signals output by the inverter are transmitted to the synthesizer through the delay line, echo signals received by the receiving antenna are transmitted to the synthesizer, and signals output by the synthesizer are transmitted to the FPGA through the RF receiving chain.
8. The radar radio frequency system of claim 7, further comprising an attenuator, wherein the signal output by the inverter is fed to the attenuator, and wherein the signal output by the attenuator is fed to the synthesizer via a delay line.
9. The radar radio frequency system according to claim 7, wherein the delay line is an adjustable delay line with an adjustable delay time.
10. The radar radio frequency system of claim 7, further comprising a clutter suppression signal transmission link, wherein the FPGA generates a clutter suppression signal via the clutter suppression signal transmission link, and wherein the clutter suppression signal is fed to the synthesizer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311160421.6A CN117233701A (en) | 2023-09-11 | 2023-09-11 | Radar radio frequency receiving method and radar radio frequency system adapting to strong clutter environment |
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| CN202311160421.6A CN117233701A (en) | 2023-09-11 | 2023-09-11 | Radar radio frequency receiving method and radar radio frequency system adapting to strong clutter environment |
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