CN107515387B - Double-excitation signal generation method and system - Google Patents
Double-excitation signal generation method and system Download PDFInfo
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- CN107515387B CN107515387B CN201710772192.1A CN201710772192A CN107515387B CN 107515387 B CN107515387 B CN 107515387B CN 201710772192 A CN201710772192 A CN 201710772192A CN 107515387 B CN107515387 B CN 107515387B
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Abstract
The invention relates to a method and a system for generating a dual excitation signal, wherein the method comprises the following steps: generating two paths of second intermediate frequency signals, and respectively carrying out up-conversion processing on the two paths of second intermediate frequency signals to obtain two paths of first intermediate frequency signals; generating at least one standard frequency signal, and selecting a target standard frequency signal from the at least one standard frequency signal according to a preset working mode; generating a broadband signal, generating a modulation signal according to the target standard frequency signal and the broadband signal, and performing corresponding processing on the modulation signal according to a preset working mode to obtain a local oscillator signal; and respectively carrying out up-conversion processing on the two paths of intermediate frequency signals and a local oscillator signal to obtain two paths of excitation signals, and controlling the output of the two paths of excitation signals according to the working mode. The invention enriches the working modes of the radar system and expands the working bandwidth of the radar system.
Description
Technical Field
The present invention relates to the field of signal processing technologies, and in particular, to a method and a system for generating dual excitation signals.
Background
The radar system comprises a signal generating system, a transmitter and the like, wherein the signal generating system generates an excitation signal, and the transmitter amplifies the excitation signal and transmits the amplified excitation signal. The radar system is only suitable for generating excitation signals with medium and small bandwidths under the influence of the bandwidth limitation of a transmitter and a signal generating system, the working bandwidth of the radar system is too narrow, the working mode of the radar system is single, and the function is not complete.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method and a system for generating a dual excitation signal aiming at the defects of the prior art.
The technical scheme for solving the technical problems is as follows: a dual excitation signal generation method, comprising:
generating two paths of second intermediate frequency signals, and respectively carrying out up-conversion processing on the two paths of second intermediate frequency signals to obtain two paths of first intermediate frequency signals;
generating at least one standard frequency signal, and selecting a target standard frequency signal from the at least one standard frequency signal according to a preset working mode;
generating a broadband signal, generating a modulation signal according to the target frequency marking signal and the broadband signal, and performing corresponding processing on the modulation signal according to the preset working mode to obtain a local oscillator signal;
and respectively carrying out up-conversion processing on the two paths of intermediate frequency signals and the local oscillator signal to obtain two paths of excitation signals, and controlling the output of the two paths of excitation signals according to the working mode.
The invention has the beneficial effects that: different target frequency marking signals are selected through different working modes, so that different target frequency marking signals are subjected to targeted processing, the working modes of the radar system are enriched, modulation signals are generated through the target frequency marking signals and the broadband signals, a local oscillator signal is obtained through processing, two generated intermediate frequency signals are subjected to up-conversion processing respectively with the local oscillator signal, two excitation signals are obtained, the bandwidth of the excitation signals is increased through controlling the output of the two excitation signals, and the working bandwidth of the radar system is expanded.
Another technical solution of the present invention for solving the above technical problems is as follows: a dual excitation signal generation system comprising:
the intermediate frequency signal generating circuit is used for generating two paths of second intermediate frequency signals and respectively carrying out up-conversion processing on the two paths of second intermediate frequency signals to obtain two paths of first intermediate frequency signals;
the target frequency marking signal selection circuit is used for generating at least one frequency marking signal and selecting the target frequency marking signal from the at least one frequency marking signal according to a preset working mode;
the local oscillator signal generating circuit is used for generating a broadband signal, generating a modulation signal according to the target frequency marking signal and the broadband signal, and correspondingly processing the modulation signal according to the preset working mode to obtain a local oscillator signal;
and the output control circuit is used for respectively carrying out up-conversion processing on the two paths of intermediate frequency signals and the local oscillator signal to obtain two paths of excitation signals and controlling the output of the two paths of excitation signals according to the working mode.
The invention has the beneficial effects that: different target frequency marking signals are selected through different working modes, so that different target frequency marking signals are subjected to targeted processing, the working modes of the radar system are enriched, modulation signals are generated through the target frequency marking signals and the broadband signals, a local oscillator signal is obtained through processing, two generated intermediate frequency signals are subjected to up-conversion processing respectively with the local oscillator signal, two excitation signals are obtained, the bandwidth of the excitation signals is increased through controlling the output of the two excitation signals, and the working bandwidth of the radar system is expanded.
Drawings
Fig. 1 is a schematic flowchart of a dual excitation signal generation method according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of a dual excitation signal generating method according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of a dual excitation signal generating system according to an embodiment of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, a dual excitation signal generating method provided in an embodiment of the present invention includes the following steps:
s1, generating two paths of second intermediate frequency signals, and respectively carrying out up-conversion processing on the two paths of second intermediate frequency signals to obtain two paths of first intermediate frequency signals;
s2, generating at least one standard frequency signal, and selecting a target standard frequency signal from the at least one standard frequency signal according to a preset working mode;
s3, generating a broadband signal, generating a modulation signal according to the target frequency marking signal and the broadband signal, and performing corresponding processing on the modulation signal according to the preset working mode to obtain a local oscillator signal;
and S4, performing up-conversion processing on the two paths of intermediate frequency signals and the local oscillator signal respectively to obtain two paths of excitation signals, and controlling the two paths of excitation signals to be output according to the working mode.
According to the double-excitation signal generation method provided by the embodiment of the invention, different target frequency marking signals are selected through different working modes, so that the different target frequency marking signals are subjected to targeted processing, the working modes of the radar system are enriched, modulation signals are generated through the target frequency marking signals and the broadband signals, a local oscillator signal is obtained through processing, two generated intermediate frequency signals and a local oscillator signal are subjected to up-conversion processing respectively to obtain two excitation signals, the bandwidth of the excitation signals is increased by controlling the output of the two excitation signals, and the working bandwidth of the radar system is expanded.
Preferably, as another embodiment of the present invention, as shown in fig. 2, in this embodiment, the S2 includes:
s21, generating a first frequency scaling signal, a second frequency scaling signal, a third frequency scaling signal and a fourth frequency scaling signal;
specifically, the frequency of the first frequency-labeled signal is fAThe frequency of the second frequency-labeled signal is fB1The frequency of the third frequency-marked signal is fB2The frequency of the fourth frequency-labeled signal is fB3。fAAnd fB1、fB2And fB3Each differing by one octave.
S22, when the working mode is the splicing mode, the first frequency marking signal is used as a target frequency marking signal;
s23, when the working mode is the independent mode, the second frequency scaling signal and the third frequency scaling signal are used as target frequency scaling signals;
s24, when the working mode is the power synthesis mode, the fourth frequency scaling signal is used as the target frequency scaling signal;
the frequencies of the first frequency scaling signal, the second frequency scaling signal, the third frequency scaling signal and the fourth frequency scaling signal are different.
In the embodiment, different target frequency signals are selected through different working modes, so that corresponding excitation signals are output, the working modes of the radar system are enriched, the working modes are not limited to a single-path transmitting mode any more, and the working modes are expanded into a splicing mode, an independent mode and a power synthesis mode.
Preferably, as another embodiment of the present invention, in this embodiment, the S3 includes:
when the working mode is the splicing mode, generating a first broadband signal, performing signal modulation according to a first standard frequency signal and the first broadband signal to generate a first modulation signal, and sequentially performing frequency doubling processing and frequency quadrupling processing on the first modulation signal to obtain a first local oscillator signal;
specifically, the first broadband signal has a center frequency fLFMBandwidth ofBw/4, performing signal modulation according to the first standard frequency signal and the first broadband signal to generate a first modulation signal, wherein the center frequency of the first modulation signal is fA-fLFMAnd the bandwidth is bw/4, the first modulation signal is sequentially subjected to frequency doubling processing and frequency quadrupling processing to obtain a first local oscillator signal, and the center frequency of the first local oscillator signal is fLO1-M1The bandwidth is 2 xbw, fLO1-M1＝4×2×(fA-fLFM)。
When the working mode is an independent mode, generating a first broadband signal, performing signal modulation according to a second standard frequency signal and the first broadband signal to generate a second modulation signal, performing signal modulation according to a third standard frequency signal and the first broadband signal to generate a third modulation signal, sequentially performing first filtering processing and quadruple frequency processing on the second modulation signal to obtain a second local oscillator signal, and sequentially performing the first filtering processing and quadruple frequency processing on the third modulation signal to obtain a third local oscillator signal;
specifically, signal modulation is carried out according to a second standard frequency signal and a first broadband signal to generate a second modulation signal, and the center frequency of the second modulation signal is fB1-fLFMAnd the bandwidth is bw/4, the second modulation signal is sequentially subjected to first filtering processing and quadruple frequency processing to obtain a second local oscillation signal, and the center frequency of the second local oscillation signal is fLO1-M2Bandwidth is bw, fLO1-M2＝4×(fB1-fLFM)。
Performing signal modulation according to the third standard frequency signal and the first broadband signal to generate a third modulation signal, wherein the center frequency of the third modulation signal is fB2-fLFMAnd the bandwidth is bw/4, the third modulation signal is sequentially subjected to first filtering processing and quadruple frequency processing to obtain a third local oscillation signal, and the center frequency of the third local oscillation signal is fLO1-M3Bandwidth is bw, fLO1-M3＝4×(fB2-fLFM)。
When the working mode is a power synthesis mode, generating a second broadband signal, performing signal modulation according to a fourth standard frequency signal and the second broadband signal to generate a fourth modulation signal, and sequentially performing second filtering processing and quadruple frequency processing on the fourth modulation signal to obtain a fourth local oscillator signal;
wherein the bandwidth of the second wideband signal is less than the bandwidth of the first wideband signal.
Specifically, the second broadband signal has a center frequency fLFMThe bandwidth is bw x/4, signal modulation is carried out according to the fourth standard frequency signal and the second broadband signal to generate a fourth modulation signal, and the center frequency of the fourth modulation signal is fB3-fLFMAnd the bandwidth is bw x/4, and the fourth modulation signal is sequentially subjected to second filtering processing and quadruple frequency processing to obtain a fourth local oscillator signal, wherein the center frequency of the fourth local oscillator signal is fLO1-M4The bandwidth is bw, fLO1-M4＝4×(fB3-fLFM)，bw*＜bw。
In the above embodiment, when the working mode is the splicing mode, the second frequency doubling and the fourth frequency doubling are performed on the modulation signal generated according to the first standard frequency signal, and the bandwidth of the obtained local oscillator signal is wider, so that the bandwidth of the excitation signal is increased, and the working bandwidth of the radar system is expanded.
Preferably, as another embodiment of the present invention, in this embodiment, the S4 includes:
when the working mode is a splicing mode, performing up-conversion processing on the two paths of first intermediate frequency signals and the first local oscillator signals respectively to obtain first excitation signals and second excitation signals, controlling the transmission parameters of the first excitation signals and the second excitation signals respectively, and controlling the first excitation signals and the second excitation signals to be spliced and output alternately;
specifically, the first excitation signal and the second excitation signal are controlled to be sequentially transmitted, so that a path of spliced transmission signal with the bandwidth of 2bw is formed and is transmitted through a radar system.
When the working mode is the independent mode, performing up-conversion processing on one of the two paths of first intermediate frequency signals and the second local oscillator signal to obtain a third excitation signal, performing up-conversion processing on the other of the two paths of first intermediate frequency signals and the third local oscillator signal to obtain a fourth excitation signal, controlling the transmission parameters of the third excitation signal and the fourth excitation signal respectively, and controlling the third excitation signal or the fourth excitation signal to be output;
specifically, the third excitation signal output or the fourth excitation signal output forms a two-way independent working mode.
And when the working mode is a power synthesis mode, performing up-conversion processing on the two paths of first intermediate frequency signals and the fourth local oscillator signal respectively to obtain two paths of fifth excitation signals, and controlling the two paths of fifth excitation signals to be output simultaneously.
Specifically, the frequency range of one path of the fifth excitation signal is fLO1-M4+fIF1A-bw 2 to fLO1-M4+fIF1A+ bw + 2; the frequency range of the other path of the fifth excitation signal is fLO1-M4+fIF1B-bw 2 to fLO1-M4+fIF1B+bw*/2。
In the above embodiment, when the operating mode is the splicing mode, the two paths of intermediate frequency signals and the local oscillator signal are subjected to up-conversion processing to obtain two paths of excitation signals, the transmission parameters of the two paths of excitation signals are controlled, and the two paths of excitation signals are controlled to be alternately output, so that the two paths of excitation signals can be combined into one path, the bandwidth of the excitation signals is increased, the operating bandwidth of the radar system is expanded, and when the operating mode is the independent mode or the power synthesis mode, the output time of the two paths of excitation signals is controlled, so that the operating mode of the radar system is enriched.
Preferably, as another embodiment of the present invention, in this embodiment, the separately controlling the transmission parameters of the first excitation signal and the second excitation signal includes:
controlling the transmission parameter of the first excitation signal to be within a first preset frequency range, controlling the transmission parameter of the second excitation signal to be within a second preset frequency range, and controlling the bandwidth of the first excitation signal to be the same as that of the second excitation signal;
specifically, the first predetermined frequency range is fLO1-M1+fIF1ABw/2 to fLO1-M1+fIF1A+ bw/2, the second predetermined frequency range is fLO1-M1+fIF1BBw/2 to fLO1-M1+fIF1B+bw+bw/2。
The controlling the emission parameters of the third and fourth excitation signals respectively comprises:
and controlling the transmission parameter of the third excitation signal to be within the third preset frequency range, controlling the transmission parameter of the fourth excitation signal to be within the fourth preset frequency range, and controlling the bandwidth of the third excitation signal to be the same as that of the fourth excitation signal.
In particular, the third predetermined frequency range is fLO1-M2+fIF1ABw/2 to fLO1-M2+fIF1A+ bw/2, fourth predetermined frequency range fLO1-M3+fIF1BBw/2 to fLO1-M3+fIF1B+bw/2。
In the above embodiment, the transmission parameter of the first excitation signal is within the first preset frequency range, the transmission parameter of the second excitation signal is within the second preset frequency range, the first excitation signal and the second excitation signal can be spliced into one signal, the bandwidth of the excitation signal is increased, the working bandwidth of the radar system is expanded, and the transmission parameter of the third excitation signal is within the third preset frequency range and the transmission parameter of the fourth excitation signal is within the fourth preset frequency range, so that the two excitation signals can be independently output.
Preferably, as another embodiment of the present invention, in this embodiment, the S1 includes:
generating two local oscillator signals, one of the two paths of two intermediate frequency signals and the other of the two paths of two intermediate frequency signals;
specifically, the frequency of one of the two intermediate frequency signals is fIF2AThe frequency of the other of the two paths of two intermediate frequency signals is fIF2BFrequency of two local oscillator signals is fLO2。
The frequency of one of the two paths of two intermediate frequency signals is close to the frequency of the other of the two paths of two intermediate frequency signals, and only a small difference exists.
And carrying out up-conversion processing on one of the two local oscillator signals and the two paths of two intermediate frequency signals to obtain one of the two paths of one intermediate frequency signals, and carrying out up-conversion processing on the other of the two local oscillator signals and the two paths of two intermediate frequency signals to obtain the other of the two paths of one intermediate frequency signals.
Specifically, one of the two paths of intermediate frequency signals has a frequency fIF1AWherein f isIF1A＝fIF2A+fLO2The frequency of the other of the two paths of the intermediate frequency signals is fIF1BWherein f isIF1B＝fIF2B+fLO2。
When the working mode is a splicing mode, the first excitation signal and the second excitation signal are influenced by the path of a hardware circuit and have delay difference, the first excitation signal and the second excitation signal are respectively compensated by adopting one of the two paths of first intermediate frequency signals and the other of the two paths of first intermediate frequency signals, the output first excitation signal and the output second excitation signal can be spliced into one path of splicing emission signal, and the one path of splicing emission signal is emitted through a radar system; similarly, when the operating mode is the power synthesis mode, the two paths of fifth excitation signals are affected by the path of the hardware circuit, so that the phase shift difference of the two paths of signals is caused, the two paths of fifth excitation signals are respectively compensated by one of the two paths of first intermediate frequency signals and the other one of the two paths of first intermediate frequency signals, and the output two paths of fifth excitation signals can be subjected to power synthesis.
In the above embodiment, two local oscillator signals and two intermediate frequency signals are respectively subjected to up-conversion processing to obtain two first intermediate frequency signals, so that compensation of two excitation signals is completed, the two excitation signals can be spliced into one channel, or independently output, or power synthesis is performed, and the working mode of the radar system is enriched.
As shown in fig. 3, an embodiment of the present invention provides a dual excitation signal generating system, including:
the intermediate frequency signal generating circuit is used for generating two paths of second intermediate frequency signals and respectively carrying out up-conversion processing on the two paths of second intermediate frequency signals to obtain two paths of first intermediate frequency signals;
the target frequency marking signal selection circuit is used for generating at least one frequency marking signal and selecting the target frequency marking signal from the at least one frequency marking signal according to a preset working mode;
the local oscillator signal generating circuit is used for generating a broadband signal, generating a modulation signal according to the target frequency marking signal and the broadband signal, and correspondingly processing the modulation signal according to the preset working mode to obtain a local oscillator signal;
and the output control circuit is used for respectively carrying out up-conversion processing on the two paths of intermediate frequency signals and the local oscillator signal to obtain two paths of excitation signals and controlling the output of the two paths of excitation signals according to the working mode.
According to the double-excitation-signal generating system provided by the embodiment of the invention, different target frequency signals are selected through different working modes, so that the different target frequency signals are subjected to targeted processing, the working modes of the radar system are enriched, modulation signals are generated through the target frequency signals and the broadband signals, a local oscillator signal is obtained through processing, two generated intermediate frequency signals and a local oscillator signal are subjected to up-conversion processing respectively to obtain two excitation signals, the bandwidth of the excitation signals is increased by controlling the output of the two excitation signals, and the working bandwidth of the radar system is expanded.
Preferably, as another embodiment of the present invention, as shown in fig. 3, in this embodiment, the target frequency scaling signal selection circuit includes:
a first frequency scaling signal generator for generating a first frequency scaling signal;
a second frequency scaling signal generator for generating a second frequency scaling signal, a third frequency scaling signal and a fourth frequency scaling signal;
specifically, the frequency of the first frequency scaling signal is different from the frequency of the second frequency scaling signal, the third frequency scaling signal or the fourth frequency scaling signal by an octave, so that the first frequency scaling signal generator and the second frequency scaling signal generator must be provided.
The standard frequency selection switch is used for taking the first standard frequency signal as a target standard frequency signal when the working mode is the splicing mode; when the working mode is the independent mode, the second frequency scaling signal and the third frequency scaling signal are used as target frequency scaling signals; when the working mode is a power synthesis mode, taking the fourth frequency scaling signal as a target frequency scaling signal;
the frequencies of the first frequency scaling signal, the second frequency scaling signal, the third frequency scaling signal and the fourth frequency scaling signal are different.
In the embodiment, different target frequency signals are selected through different working modes, so that corresponding excitation signals are output, the working modes of the radar system are enriched, the working modes are not limited to a single-path transmitting mode any more, and the working modes are expanded into a splicing mode, an independent mode and a power synthesis mode.
Preferably, as another embodiment of the present invention, as shown in fig. 3, the local oscillator signal generating circuit includes:
the broadband waveform generator is used for generating a first broadband signal when the working mode is a splicing mode or an independent mode, and generating a second broadband signal when the working mode is a power synthesis mode, wherein the bandwidth of the second broadband signal is smaller than that of the first broadband signal;
the modulator is used for carrying out signal modulation according to a first standard frequency signal and the first broadband signal to generate a first modulation signal when the working mode is the splicing mode; when the working mode is an independent mode, performing signal modulation according to a second standard frequency signal and the first broadband signal to generate a second modulation signal, and performing signal modulation according to a third standard frequency signal and the first broadband signal to generate a third modulation signal; when the working mode is a power synthesis mode, performing signal modulation according to a fourth standard frequency signal and the second broadband signal to generate a fourth modulation signal;
specifically, the modulator respectively performs frequency shifting on the first standard frequency signal, the second standard frequency signal and the third standard frequency signal according to the frequency of the first broadband signal, and performs frequency shifting on the fourth standard frequency signal according to the second broadband signal.
The mode selection switch is used for sending the first modulation signal to the frequency doubler when the working mode is the splicing mode, sending the second modulation signal and the third modulation signal to the second filter when the working mode is the independent mode, and sending the fourth modulation signal to the third filter when the working mode is the power synthesis mode;
the frequency doubler is used for carrying out frequency doubling processing on the first modulation signal when the working mode is the splicing mode;
the first filter is used for carrying out first filtering processing on the second modulation signal when the working mode is the independent mode;
the second filter is used for carrying out first filtering processing on the third modulation signal when the working mode is the independent mode;
the third filter is used for carrying out second filtering processing on the fourth modulation signal when the working mode is the power synthesis mode;
and the quadrupler is used for performing quadruple frequency processing on the first modulation signal subjected to double frequency processing, the second modulation signal subjected to first filtering processing, the third modulation signal subjected to first filtering processing and the fourth modulation signal subjected to second filtering processing respectively to obtain a first local oscillation signal, a second local oscillation signal, a third local oscillation signal and a fourth local oscillation signal.
In the above embodiment, when the working mode is the splicing mode, the second frequency doubling and the fourth frequency doubling are performed on the modulation signal generated according to the first standard frequency signal, and the bandwidth of the obtained local oscillator signal is wider, so that the bandwidth of the excitation signal is increased, and the working bandwidth of the radar system is expanded.
Preferably, as another embodiment of the present invention, as shown in fig. 3, the output control circuit includes:
the first secondary up-converter is used for performing up-conversion processing on one of the two paths of first intermediate frequency signals and the first local oscillator signal to obtain a first excitation signal when the working mode is the splicing mode; when the working mode is the independent mode, one of the two paths of first intermediate frequency signals and the second local oscillator signal are subjected to up-conversion processing to obtain a third excitation signal; when the working mode is a power synthesis mode, performing up-conversion processing on one of the two paths of first intermediate frequency signals and the fourth local oscillator signal to obtain a path of fifth excitation signal;
the second secondary up-converter is used for performing up-conversion processing on the other of the two paths of first intermediate frequency signals and the first local oscillator signal to obtain a second excitation signal when the working mode is the splicing mode; when the working mode is the independent mode, performing up-conversion processing on the other of the two paths of first intermediate frequency signals and the third local oscillator signal to obtain a fourth excitation signal; when the working mode is a power synthesis mode, performing up-conversion processing on the other of the two paths of first intermediate frequency signals and the fourth local oscillator signal to obtain another path of fifth excitation signal;
the first shaping switch is used for controlling the transmission parameter of the first excitation signal and controlling the output time of the first excitation signal when the working mode is the splicing mode; when the working mode is the independent mode, controlling the emission parameter of the third excitation signal and controlling the output of the third excitation signal; when the working mode is a power synthesis mode, controlling the output of the fifth excitation signal;
the second shaping switch is used for controlling the transmission parameter of the second excitation signal and controlling the output time of the second excitation signal when the working mode is the splicing mode; when the working mode is the independent mode, controlling the emission parameter of the fourth excitation signal and controlling the output of the fourth excitation signal; and when the working mode is the power synthesis mode, controlling the other path of the fifth excitation signal to be output.
In the above embodiment, when the operating mode is the splicing mode, the two paths of intermediate frequency signals and the local oscillator signal are subjected to up-conversion processing to obtain two paths of excitation signals, the transmission parameters of the two paths of excitation signals are controlled, and the two paths of excitation signals are controlled to be alternately output, so that the two paths of excitation signals can be combined into one path, the bandwidth of the excitation signals is increased, the operating bandwidth of the radar system is expanded, and when the operating mode is the independent mode or the power synthesis mode, the output time of the two paths of excitation signals is controlled, so that the operating mode of the radar system is enriched.
Preferably, as another embodiment of the present invention, in this embodiment, the first shaping switch is specifically configured to:
controlling the transmission parameter of the first excitation signal to be within a first preset frequency range, controlling the transmission parameter of the second excitation signal to be within a second preset frequency range, and controlling the bandwidth of the first excitation signal to be the same as that of the second excitation signal;
the second shaping switch is specifically configured to:
and controlling the transmission parameter of the third excitation signal to be within the third preset frequency range, controlling the transmission parameter of the fourth excitation signal to be within the fourth preset frequency range, and controlling the bandwidth of the third excitation signal to be the same as that of the fourth excitation signal.
In the above embodiment, the transmission parameter of the first excitation signal is within the first preset frequency range, the transmission parameter of the second excitation signal is within the second preset frequency range, the first excitation signal and the second excitation signal can be spliced into one signal, the bandwidth of the excitation signal is increased, the working bandwidth of the radar system is expanded, and the transmission parameter of the third excitation signal is within the third preset frequency range and the transmission parameter of the fourth excitation signal is within the fourth preset frequency range, so that the two excitation signals can be independently output.
Preferably, as another embodiment of the present invention, as shown in fig. 3, the intermediate frequency signal generating circuit includes:
the first narrow-band waveform generator is used for generating one of the two paths of the two intermediate-frequency signals;
the second narrow-band waveform generator is used for generating the other of the two paths of second intermediate frequency signals;
the second local oscillator signal generator is used for generating a second local oscillator signal;
the first primary up-converter is used for performing up-conversion processing on one of the two local oscillator signals and the two paths of the two intermediate frequency signals to obtain one of the two paths of the one intermediate frequency signals;
and the second primary up-converter is used for carrying out up-conversion processing on the other path of the two local oscillator signals and the two paths of the two intermediate frequency signals to obtain the other path of the two paths of the one intermediate frequency signals.
In the above embodiment, two local oscillator signals and two intermediate frequency signals are respectively subjected to up-conversion processing to obtain two first intermediate frequency signals, so that compensation of two excitation signals is completed, the two excitation signals can be spliced into one channel, or independently output, or power synthesis is performed, and the working mode of the radar system is enriched.
The functions performed by the components of the system have been described in detail in the above-mentioned embodiment, i.e. the dual excitation signal generation method, and are not described here again.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A dual excitation signal generation method, comprising the steps of:
generating two paths of second intermediate frequency signals, and respectively carrying out up-conversion processing on the two paths of second intermediate frequency signals to obtain two paths of first intermediate frequency signals;
generating at least one standard frequency signal, and selecting a target standard frequency signal from the at least one standard frequency signal according to a preset working mode;
generating a broadband signal, generating a modulation signal according to the target frequency marking signal and the broadband signal, and performing corresponding processing on the modulation signal according to the preset working mode to obtain a local oscillator signal;
and respectively carrying out up-conversion processing on the two paths of intermediate frequency signals and the local oscillator signal to obtain two paths of excitation signals, and controlling the output of the two paths of excitation signals according to the working mode.
2. The method of claim 1, wherein generating at least one scalar signal from which the target scalar signal is selected according to the predetermined operating mode comprises:
generating a first frequency scaling signal, a second frequency scaling signal, a third frequency scaling signal and a fourth frequency scaling signal;
when the working mode is the splicing mode, the first standard frequency signal is used as a target standard frequency signal;
when the working mode is the independent mode, the second frequency scaling signal and the third frequency scaling signal are used as target frequency scaling signals;
when the working mode is a power synthesis mode, taking the fourth frequency scaling signal as a target frequency scaling signal;
the frequencies of the first frequency scaling signal, the second frequency scaling signal, the third frequency scaling signal and the fourth frequency scaling signal are different.
3. The method of claim 2, wherein the generating a wideband signal, generating a modulation signal according to the target standard frequency signal and the wideband signal, and performing corresponding processing on the modulation signal according to the preset operating mode to obtain a local oscillator signal comprises:
when the working mode is the splicing mode, generating a first broadband signal, performing signal modulation according to a first standard frequency signal and the first broadband signal to generate a first modulation signal, and sequentially performing frequency doubling processing and frequency quadrupling processing on the first modulation signal to obtain a first local oscillator signal;
when the working mode is an independent mode, generating a first broadband signal, performing signal modulation according to a second standard frequency signal and the first broadband signal to generate a second modulation signal, performing signal modulation according to a third standard frequency signal and the first broadband signal to generate a third modulation signal, sequentially performing first filtering processing and quadruple frequency processing on the second modulation signal to obtain a second local oscillator signal, and sequentially performing the first filtering processing and quadruple frequency processing on the third modulation signal to obtain a third local oscillator signal;
when the working mode is a power synthesis mode, generating a second broadband signal, performing signal modulation according to a fourth standard frequency signal and the second broadband signal to generate a fourth modulation signal, and sequentially performing second filtering processing and quadruple frequency processing on the fourth modulation signal to obtain a fourth local oscillator signal;
wherein the bandwidth of the second wideband signal is less than the bandwidth of the first wideband signal.
4. The method according to claim 3, wherein the performing up-conversion processing on the two paths of first intermediate frequency signals and the one local oscillator signal respectively to obtain two paths of excitation signals, and controlling output of the two paths of excitation signals according to the working mode comprises:
when the working mode is a splicing mode, performing up-conversion processing on the two paths of first intermediate frequency signals and the first local oscillator signals respectively to obtain first excitation signals and second excitation signals, controlling the transmission parameters of the first excitation signals and the second excitation signals respectively, and controlling the first excitation signals and the second excitation signals to be spliced and output alternately;
when the working mode is the independent mode, performing up-conversion processing on one of the two paths of first intermediate frequency signals and the second local oscillator signal to obtain a third excitation signal, performing up-conversion processing on the other of the two paths of first intermediate frequency signals and the third local oscillator signal to obtain a fourth excitation signal, controlling the transmission parameters of the third excitation signal and the fourth excitation signal respectively, and controlling the third excitation signal or the fourth excitation signal to be output;
and when the working mode is a power synthesis mode, performing up-conversion processing on the two paths of first intermediate frequency signals and the fourth local oscillator signal respectively to obtain two paths of fifth excitation signals, and controlling the two paths of fifth excitation signals to be output simultaneously.
5. The method of claim 4, wherein the separately controlling the transmission parameters of the first and second excitation signals comprises:
controlling the transmission parameter of the first excitation signal to be within a first preset frequency range, controlling the transmission parameter of the second excitation signal to be within a second preset frequency range, and controlling the bandwidth of the first excitation signal to be the same as that of the second excitation signal;
the controlling the emission parameters of the third and fourth excitation signals respectively comprises:
and controlling the transmission parameter of the third excitation signal to be within a third preset frequency range, controlling the transmission parameter of the fourth excitation signal to be within a fourth preset frequency range, and controlling the bandwidth of the third excitation signal to be the same as that of the fourth excitation signal.
6. A dual excitation signal generation system, comprising:
the intermediate frequency signal generating circuit is used for generating two paths of second intermediate frequency signals and respectively carrying out up-conversion processing on the two paths of second intermediate frequency signals to obtain two paths of first intermediate frequency signals;
the target frequency marking signal selection circuit is used for generating at least one frequency marking signal and selecting the target frequency marking signal from the at least one frequency marking signal according to a preset working mode;
the local oscillator signal generating circuit is used for generating a broadband signal, generating a modulation signal according to the target frequency marking signal and the broadband signal, and correspondingly processing the modulation signal according to the preset working mode to obtain a local oscillator signal;
and the output control circuit is used for respectively carrying out up-conversion processing on the two paths of intermediate frequency signals and the local oscillator signal to obtain two paths of excitation signals and controlling the output of the two paths of excitation signals according to the working mode.
7. The system of claim 6, wherein the target-scale signal selection circuit comprises:
a first frequency scaling signal generator for generating a first frequency scaling signal;
a second frequency scaling signal generator for generating a second frequency scaling signal, a third frequency scaling signal and a fourth frequency scaling signal;
the standard frequency selection switch is used for taking the first standard frequency signal as a target standard frequency signal when the working mode is the splicing mode; when the working mode is the independent mode, the second frequency scaling signal and the third frequency scaling signal are used as target frequency scaling signals; when the working mode is a power synthesis mode, taking the fourth frequency scaling signal as a target frequency scaling signal;
the frequencies of the first frequency scaling signal, the second frequency scaling signal, the third frequency scaling signal and the fourth frequency scaling signal are different.
8. The system of claim 7, wherein the local oscillator signal generating circuit comprises:
the broadband waveform generator is used for generating a first broadband signal when the working mode is a splicing mode or an independent mode, and generating a second broadband signal when the working mode is a power synthesis mode, wherein the bandwidth of the second broadband signal is smaller than that of the first broadband signal;
the modulator is used for carrying out signal modulation according to a first standard frequency signal and the first broadband signal to generate a first modulation signal when the working mode is the splicing mode; when the working mode is an independent mode, performing signal modulation according to a second standard frequency signal and the first broadband signal to generate a second modulation signal, and performing signal modulation according to a third standard frequency signal and the first broadband signal to generate a third modulation signal; when the working mode is a power synthesis mode, performing signal modulation according to a fourth standard frequency signal and the second broadband signal to generate a fourth modulation signal;
the frequency doubler is used for carrying out frequency doubling processing on the first modulation signal when the working mode is the splicing mode;
the first filter is used for carrying out first filtering processing on the second modulation signal when the working mode is the independent mode;
the second filter is used for carrying out first filtering processing on the third modulation signal when the working mode is the independent mode;
the third filter is used for carrying out second filtering processing on the fourth modulation signal when the working mode is the power synthesis mode;
and the quadrupler is used for performing quadruple frequency processing on the first modulation signal subjected to double frequency processing, the second modulation signal subjected to first filtering processing, the third modulation signal subjected to first filtering processing and the fourth modulation signal subjected to second filtering processing respectively to obtain a first local oscillation signal, a second local oscillation signal, a third local oscillation signal and a fourth local oscillation signal.
9. The system of claim 8, wherein the output control circuit comprises:
the first secondary up-converter is used for performing up-conversion processing on one of the two paths of first intermediate frequency signals and the first local oscillator signal to obtain a first excitation signal when the working mode is the splicing mode; when the working mode is the independent mode, one of the two paths of first intermediate frequency signals and the second local oscillator signal are subjected to up-conversion processing to obtain a third excitation signal; when the working mode is a power synthesis mode, performing up-conversion processing on one of the two paths of first intermediate frequency signals and the fourth local oscillator signal to obtain a path of fifth excitation signal;
the second secondary up-converter is used for performing up-conversion processing on the other of the two paths of first intermediate frequency signals and the first local oscillator signal to obtain a second excitation signal when the working mode is the splicing mode; when the working mode is the independent mode, performing up-conversion processing on the other of the two paths of first intermediate frequency signals and the third local oscillator signal to obtain a fourth excitation signal; when the working mode is a power synthesis mode, performing up-conversion processing on the other of the two paths of first intermediate frequency signals and the fourth local oscillator signal to obtain another path of fifth excitation signal;
the first shaping switch is used for controlling the transmission parameter of the first excitation signal and controlling the output time of the first excitation signal when the working mode is the splicing mode; when the working mode is the independent mode, controlling the emission parameter of the third excitation signal and controlling the output of the third excitation signal; when the working mode is a power synthesis mode, controlling the output of the fifth excitation signal;
the second shaping switch is used for controlling the transmission parameter of the second excitation signal and controlling the output time of the second excitation signal when the working mode is the splicing mode; when the working mode is the independent mode, controlling the emission parameter of the fourth excitation signal and controlling the output of the fourth excitation signal; and when the working mode is the power synthesis mode, controlling the other path of the fifth excitation signal to be output.
10. The system of claim 9, wherein the first shaping switch is specifically configured to:
controlling the transmission parameter of the first excitation signal to be within a first preset frequency range, controlling the transmission parameter of the second excitation signal to be within a second preset frequency range, and controlling the bandwidth of the first excitation signal to be the same as that of the second excitation signal;
the second shaping switch is specifically configured to:
and controlling the transmission parameter of the third excitation signal to be within a third preset frequency range, controlling the transmission parameter of the fourth excitation signal to be within a fourth preset frequency range, and controlling the bandwidth of the third excitation signal to be the same as that of the fourth excitation signal.
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| CN101207403A (en) * | 2007-12-19 | 2008-06-25 | 哈尔滨工程大学 | Broadband radio frequency front end of intermediate wave frequency band high dynamic range |
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| CN101207403A (en) * | 2007-12-19 | 2008-06-25 | 哈尔滨工程大学 | Broadband radio frequency front end of intermediate wave frequency band high dynamic range |
| CN101435862A (en) * | 2008-07-29 | 2009-05-20 | 北京航空航天大学 | Up converter and signal processing method thereof |
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