CN113794483A - Radio frequency front end of pulse compression missile-borne detector - Google Patents
Radio frequency front end of pulse compression missile-borne detector Download PDFInfo
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- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
- H04B1/1036—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters
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- H—ELECTRICITY
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- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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- H—ELECTRICITY
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
- H04B2001/1072—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal by tuning the receiver frequency
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Abstract
The invention discloses a radio frequency front end of a pulse compression missile-borne detector, which comprises an intermediate frequency signal source, a two-stage upper frequency mixing module, a two-stage lower frequency mixing module, a phase shifter, a first local oscillator signal source module, a second local oscillator signal source module, a circulator and an antenna, wherein the intermediate frequency signal source is connected with the two-stage upper frequency mixing module; the output end of the intermediate frequency signal source is connected with the two-stage upper frequency mixing module, the two-way output end of the first local oscillator signal source module is respectively connected with the phase shifter and the two-stage lower frequency mixing module, the two-way output end of the second local oscillator signal source module is respectively connected with the two-stage upper frequency mixing module and the two-stage lower frequency mixing module, the output end of the phase shifter is connected with the two-stage upper frequency mixing module, the antenna is respectively connected with the two-stage upper frequency mixing module and the two-stage lower frequency mixing module through the circulator, and the two-stage lower frequency mixing module outputs an echo intermediate frequency signal to be transmitted to the signal processing system. This radio frequency front end adopts two-stage up-conversion, carries out phase modulation to first order local oscillator low frequency signal, has realized that the phase modulation frequency reduces to the low frequency band from the high frequency band, has reduced the demand to moving looks ware performance.
Description
Technical Field
The invention relates to the field of missile-borne detectors, in particular to a radio frequency front end of a pulse compression missile-borne detector.
Background
With the application of digital receivers, modern signal processing techniques and various high-speed integrated processing devices, the electronic countermeasure equipment can analyze, process and identify the detector signals in near real time. This presents a serious challenge to tamper resistance for missile-borne probes. The linear frequency modulation and phase coding composite system detection system has the advantages of pseudo code phase modulation and frequency modulation, and is a detection system with stronger anti-interference capability.
When the traditional missile-borne detector realizes phase modulation, high-frequency-band signals are subjected to phase coding, so that the requirement of the detector on the performance of a phase shifter is high, and the realization is difficult. For example, a paper "a phase coding pulse compression V-band pulse doppler fuse design" of an airborne weapon (2021, 27 vol. 1) published by the zhanghong flag of the Chinese air missile research institute and the like, realizes a phase coding modulation method: the intermediate frequency signal is quadrupled to a V wave band, and then 0/pi phase modulation is realized through a two-stage high-speed single-pole double-throw switch. In addition, the pseudo code phase modulation and linear frequency modulation composite modulation fuse (2008, volume 29, 3 rd) published by encyclopedia of enchan, shinechuan and the like at the university of Nanjing rationality (Yunxingjian, Zhao, Huichang) is also phase-modulated in a high frequency band, and has great difficulty in realizing high precision of the phase shifter.
Disclosure of Invention
The invention aims to provide a radio frequency front end of a pulse compression missile-borne detector, which reduces the requirements on the performance of a phase shifter and realizes intra-pulse linear frequency modulation and phase coding time-sharing composite modulation.
The technical solution for realizing the purpose of the invention is as follows: a radio frequency front end of a pulse compression missile-borne detector is characterized in that intra-pulse linear frequency modulation and phase coding time-sharing composite modulation are carried out, a two-stage up/down frequency mixing structure is adopted, phase coding is carried out on a first local oscillator signal, and two-stage up-conversion is carried out on an intermediate frequency signal, the first local oscillator signal and a second local oscillator signal which are subjected to phase modulation, so that an intra-pulse phase coding transmitting signal is obtained;
the radio frequency front end of the detector comprises a first local oscillator signal source module, a second local oscillator signal source module, an intermediate frequency signal source, a two-stage upper frequency mixing module, a two-stage lower frequency mixing module, a phase shifter, a circulator and an antenna;
the output end of the intermediate frequency signal source is connected with the two-stage upper frequency mixing module, the two-way output end of the first local oscillator signal source module is respectively connected with the phase shifter and the two-stage lower frequency mixing module, the two-way output end of the second local oscillator signal source module is respectively connected with the two-stage upper frequency mixing module and the two-stage lower frequency mixing module, the output end of the phase shifter is connected with the two-stage upper frequency mixing module, the antenna is respectively connected with the two-stage upper frequency mixing module and the two-stage lower frequency mixing module through the circulator, and the two-stage lower frequency mixing module outputs an echo intermediate frequency signal to be transmitted to the signal processing system.
Compared with the prior art, the invention has the following remarkable advantages: the radio frequency front end of the pulse compression missile-borne detector performs phase modulation on a first local oscillator signal through two-stage frequency conversion, and performs two-stage up-conversion on an intermediate frequency signal, the phase-modulated first local oscillator signal and a second local oscillator signal to obtain an intra-pulse phase modulation transmitting signal; the phase modulation frequency is reduced from a high frequency band to a low frequency band, and the performance requirement on the phase shifter is reduced.
Drawings
The invention is described in further detail below with reference to the figures and specific embodiments.
FIG. 1 is a schematic diagram of the module composition of the radio frequency front end of the composite multi-system Ka-band pulse compression radar of the present invention.
FIG. 2 is a block diagram of a radio frequency front end system of the composite multi-system Ka-band pulse compression radar of the invention.
Detailed Description
As described in the background art, the chirp and phase-coded composite system detection system has the advantages of both pseudo code phase modulation and frequency modulation, and is a detection system with higher interference resistance. The traditional detector carries out phase modulation in a high-frequency section, has high requirements on the performance of a phase shifter and is difficult to realize. Therefore, the radio frequency front end of the pulse compression missile-borne detector disclosed by the invention performs phase modulation on the first local oscillator signal through two-stage frequency conversion, and performs two-stage up-conversion on the intermediate frequency signal, the phase-modulated first local oscillator signal and the phase-modulated second local oscillator signal to obtain an intra-pulse phase modulation transmitting signal. The phase modulation frequency is reduced from a high frequency band to a low frequency band, and the performance requirement on the phase shifter is reduced.
With reference to fig. 1 and 2, the radio frequency front end of the pulse compression missile-borne detector includes: the device comprises an intermediate frequency signal source, a two-stage upper frequency mixing module, a two-stage lower frequency mixing module, a phase shifter, a first local oscillator signal source module, a second local oscillator signal source module, a circulator and an antenna. And performing intra-pulse linear frequency modulation and phase coding time-sharing composite modulation, performing phase coding on the first local oscillator signal by adopting a two-stage up/down mixing structure, and performing two-stage up-conversion on the intermediate frequency signal, the phase-modulated first local oscillator signal and the phase-modulated second local oscillator signal to obtain an intra-pulse phase coding transmitting signal.
The intermediate frequency signal source is connected with the two-stage upper frequency mixing module, the first local oscillator signal source module outputs two paths of signals which are respectively connected with the phase shifter and the two-stage lower frequency mixing module, the phase shifter is connected with the two-stage upper frequency mixing module, and the second local oscillator signal source module outputs two paths of signals which are respectively connected with the two-stage upper frequency mixing module and the two-stage lower frequency mixing module. The output end of the two-stage upper frequency mixing module is connected with the circulator, the other two ports of the circulator are respectively connected with the antenna and the two-stage lower frequency mixing module, and the two-stage lower frequency mixing module outputs echo intermediate frequency signals and transmits the echo intermediate frequency signals to the signal processing system.
When linear frequency modulation is carried out in the vein, the intermediate frequency signal source generates a frequency f0Intermediate frequency signal S of +/-Delta f0(t) the phase shifter has a shift vector of 0 DEG, and the first local oscillator module generates a frequency f1First local oscillator signal S1(t)，f1Is L band or S band. The second local oscillator signal source module generates a frequency f2Second local oscillator signal S2(t), signal S0(t) and S1(t) up-conversion, filtering and power amplification processing are carried out by the first stage of the two-stage up-mixing module to obtain an up-conversion signal S3(t)，S3(t) and then the second local oscillator signal S2(t) is subjected to second-stage up-conversion, filtering and power amplification by a two-stage up-mixing module to obtain a transmitting signal S4And (t) transmitting the signal to an antenna through a circulator and transmitting the signal. When receiving signals, the antenna transmits the received echo signals to the two-stage down-mixing module through circulator switch control, and the echo signals are subjected to frequency mixing, filtering and amplification processing by the two-stage down-mixing module to obtain intermediate-frequency echo signals.
When the pulse phase code modulation is performed, the intermediate frequency signal source generates a frequency f0Of the intermediate frequency signal S0(t) phase shifter performs 0/pi phase modulation, signal S1(t) is modulated by a phase shifter to produce S5(t), intermediate frequency signal S0(t) and the signal S5(t) is subjected to first-stage up-conversion, filtering and power amplification by the two-stage up-mixing module to obtain a signal S6(t)，S6(t) and then the second local oscillator signal S2(t) second up-conversion, filtering and power amplification are carried out by the two-stage up-mixing module to obtain a transmitting signal S7(t) of (d). When receiving signals, the antenna transmits the received echo signals to the two-stage down-mixing module through circulator switch control, and the echo signals are subjected to frequency mixing, filtering and amplification processing by the two-stage down-mixing module to obtain intermediate-frequency echo signals.
Further, the intermediate frequency signal source is a direct digital frequency synthesizer DDS.
Further, the first local oscillation signal source module includes a voltage-controlled oscillator and a power divider. The output frequency of the voltage-controlled oscillator is f1The signal is divided into two parts by the power divider, one path of signal is connected with the phase shifter, and the other path of signal is connected with the two-stage down-mixing module.
Further, the second local oscillation signal source module includes a voltage-controlled oscillator, a quadrupler and a power divider. The output frequency of the voltage-controlled oscillator is f2The/4 signal is processed by a quadrupler to obtain the frequency f2The signal is divided into two parts by the power divider and is respectively connected with the two-stage up-mixing module and the two-stage down-mixing module.
Further, the two-stage up-mixing module comprises two mixers (MIX1, MIX2), two band-pass filters (BPF1, BPF2), and two power amplifiers (PA1, PA 2).
Further, the two-stage down-mixing module comprises a low noise amplifier LNA, two band pass filters (BPF3, BPF4), a low pass filter LPF, two mixers (MIX3, MIX4), and a power amplifier PA 3.
Furthermore, the power dividers in the first local oscillation signal source module and the second local oscillation signal source module are wilkins power dividers.
Intermediate frequency f generated by intermediate frequency signal source0The signal phase shifter has a first local oscillator frequency of f1The signals are phase-modulated, and the signals are up-converted and filtered by a mixer MIX1 and a filter BPF1 to obtain a frequency f0+f1The signal is amplified by a power amplifier PA1, and the frequency generated by the amplified signal and the second local oscillation signal source module is f2The signal is up-converted, filtered and amplified by a mixer MIX2, a filter BPF2 and a power amplifier PA2 to obtain a frequency f0+f1+f2Is transmitted. The transmitting signal is controlled by the switch of the circulator to be transmitted to the antenna and then is sent out through the antenna.
The receiving and transmitting antenna transmits the received echo signal to the low noise amplifier through the control of the circulator switch, the frequency generated by the amplified echo signal and the second local oscillation signal source module is f2The local oscillation signal is subjected to first-stage down-conversion through a mixer MIX3, the signal obtained by down-conversion sequentially passes through a band-pass filter BPF3 and a power amplifier PA3, and the output frequency of the power amplifier PA3 is f1+f0And f echo signal of1The local oscillator signal is subjected to secondary down-conversion through a mixer MIX4, and an output signal of a mixer MIX4 is subjected to a low-pass filter LPF to obtain an echo intermediate frequency signal.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
Examples
The embodiment of the invention provides a radio frequency front end of a multi-body time-sharing composite Ka-band pulse compression missile-borne detector. Fig. 1 is a schematic structural diagram of the present invention, and fig. 2 is a detailed structural diagram of the present invention, wherein the radio frequency front end of the multi-body time-sharing composite Ka-band pulse compression missile-borne detector comprises: the device comprises an intermediate frequency signal source, a two-stage upper frequency mixing module, a two-stage lower frequency mixing module, a phase shifter, a first local oscillator signal source module, a second local oscillator signal source module, a circulator and an antenna.
The intermediate frequency signal source is connected with the two-stage upper frequency mixing module, the first local oscillator signal source module outputs two paths of signals which are respectively connected with the phase shifter and the two-stage lower frequency mixing module, the phase shifter is connected with the two-stage upper frequency mixing module, and the second local oscillator signal source module outputs two paths of signals which are respectively connected with the two-stage upper frequency mixing module and the two-stage lower frequency mixing module. The output end of the two-stage upper frequency mixing module is connected with the circulator, the other two ports of the circulator are respectively connected with the antenna and the two-stage lower frequency mixing module, and the two-stage lower frequency mixing module outputs echo intermediate frequency signals and transmits the echo intermediate frequency signals to the signal processing system.
When linear frequency modulation is carried out in the pulse, the intermediate frequency signal source generates an intermediate frequency signal S with the frequency of 50MHz-150MHz0And (t), the phase shifter shift vector is 0 degrees, and the first local oscillation source module generates a first local oscillation signal with the frequency of 3 GHz. The second local oscillation signal source module generates a second local oscillation signal S with the frequency of 32GHz2(t), signal S0(t) and S1(t) up-conversion, filtering and power amplification processing are carried out by the first stage of the two-stage up-mixing module to obtain an up-conversion signal S3(t)，S3(t) and then the second local oscillator signal S2(t) is subjected to second-stage up-conversion, filtering and power amplification by a two-stage up-mixing module to obtain a transmitting signal S with the frequency of 35.1GHz +/-50 MHz4(t), signal S4And (t) transmitting the signal to an antenna through a circulator and transmitting the signal. When receiving signals, the antenna transmits the received echo signals to the two-stage down-mixing module through circulator switch control, and the echo signals are subjected to frequency mixing, filtering and amplification processing by the two-stage down-mixing module to obtain intermediate-frequency echo signals.
When the phase code modulation is performed in the pulse, the intermediate frequency signal source generates an intermediate frequency signal S with the frequency of 100MHz0(t) phase shifter performs 0/pi phase modulation, signal S1(t) is modulated by a phase shifter to produce S5(t), intermediate frequency signalNumber S0(t) and the signal S5(t) performing first-stage up-conversion, filtering and power amplification by two-stage up-mixing module to obtain signal S with frequency of 3.1GHz6(t), signal S6(t) and then the second local oscillator signal S2(t) carrying out second-stage up-conversion, filtering and power amplification by the two-stage up-mixing module to obtain a transmitting signal S with the frequency of 35.1GHz7(t) of (d). When receiving signals, the antenna transmits the received echo signals to the two-stage down-mixing module through circulator switch control, and the echo signals are subjected to frequency mixing, filtering and amplification processing by the two-stage down-mixing module to obtain intermediate-frequency echo signals.
The intermediate frequency signal source is a direct digital frequency synthesizer DDS.
The first local oscillation signal source module comprises a voltage-controlled oscillator and a power divider. The output frequency of the voltage-controlled oscillator is 3GHz, the signal is divided into two parts by the power divider, one part of the signal is connected with the phase shifter, and the other part of the signal is connected with the two-stage down-mixing module.
The second local oscillation signal source module comprises a voltage-controlled oscillator, a quadrupler and a power divider. The output frequency of the voltage-controlled oscillator is 8GHz, the signal is processed by a quadrupler to obtain a signal with the frequency of 32GHz, and the signal is halved by a power divider and respectively connected with the two-stage upper frequency mixing module and the two-stage lower frequency mixing module.
The two-stage up-mixing module comprises two mixers (MIX1, MIX2), two band-pass filters (BPF1, BPF2), and two power amplifiers (PA1, PA 2).
The two-stage down-mixing module comprises a low noise amplifier LNA, two band pass filters (BPF3, BPF4), a low pass filter LPF, two mixers (MIX3, MIX4) and a power amplifier PA 3.
The power divider in the first local oscillation signal source module and the second local oscillation signal source module is a Wilkins power divider.
The phase shifter performs phase modulation on a first local oscillation 3GHz signal by an intermediate frequency signal generated by an intermediate frequency signal source, the signals of the first local oscillation and the 3GHz signal are subjected to up-conversion and filtering processing by a mixer MIX1 and a filter BPF1 to obtain a signal with the frequency of 3.1GHz, the signal is amplified by a power amplifier PA1, and the amplified signal and a signal with the frequency of 32GHz generated by a second local oscillation signal source module are subjected to up-conversion and filtering amplification by a mixer MIX2, a filter BPF2 and a power amplifier PA2 to obtain a transmitting signal with the frequency of 35.1 GHz. The transmitting signal is controlled by the switch of the circulator to be transmitted to the antenna and then is sent out through the antenna.
The receiving and transmitting antenna transmits the received echo signal to the low noise amplifier through circulator switch control, the amplified echo signal and a local oscillator signal with the frequency of 32GHz generated by the second local oscillator signal source module are subjected to first-stage down conversion through a mixer MIX3, the signal obtained by down conversion sequentially passes through a band-pass filter BPF3 and a power amplifier PA3, the power amplifier PA3 outputs the echo signal with the frequency of 3.1GHz and the local oscillator signal with the frequency of 3GHz to be subjected to secondary down conversion through a mixer MIX4, and the output signal of the mixer MIX4 passes through a low pass filter LPF to obtain an echo intermediate frequency signal.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A radio frequency front end of a pulse compression missile-borne detector is characterized in that intra-pulse linear frequency modulation and phase coding time-sharing composite modulation are carried out, a two-stage up/down frequency mixing structure is adopted, phase coding is carried out on a first local oscillator signal, and two-stage up-conversion is carried out on an intermediate frequency signal, the first local oscillator signal and a second local oscillator signal which are subjected to phase modulation, so that an intra-pulse phase coding transmitting signal is obtained;
the radio frequency front end of the detector comprises a first local oscillator signal source module, a second local oscillator signal source module, an intermediate frequency signal source, a two-stage upper frequency mixing module, a two-stage lower frequency mixing module, a phase shifter, a circulator and an antenna;
the output end of the intermediate frequency signal source is connected with the two-stage upper frequency mixing module, the two-way output end of the first local oscillator signal source module is respectively connected with the phase shifter and the two-stage lower frequency mixing module, the two-way output end of the second local oscillator signal source module is respectively connected with the two-stage upper frequency mixing module and the two-stage lower frequency mixing module, the output end of the phase shifter is connected with the two-stage upper frequency mixing module, the antenna is respectively connected with the two-stage upper frequency mixing module and the two-stage lower frequency mixing module through the circulator, and the two-stage lower frequency mixing module outputs an echo intermediate frequency signal to be transmitted to the signal processing system.
2. The RF front-end of a pulse compression missile-borne detector as claimed in claim 1, wherein the IF signal source generates a frequency f when chirped in a pulse0Intermediate frequency signal S of +/-Delta f0(t) the phase shifter has a shift vector of 0 DEG, and the first local oscillator module generates a frequency f1First local oscillator signal S1(t)，f1Is L wave band or S wave band; the second local oscillator signal source module generates a frequency f2Second local oscillator signal S2(t), signal S0(t) and S1(t) performing a first up-conversion, filtering and power amplification process by the two-stage up-mixing module to obtain an up-conversion signal S3(t)；S3(t) and then the second local oscillator signal S2(t) second up-conversion, filtering and power amplification are carried out by the two-stage up-mixing module to obtain the frequency f0+f1+f2+/-Delta f transmit signal S4And (t) transmitting the signal to an antenna through a circulator and transmitting the signal.
3. The rf front end of a pulse compression missile-borne detector as claimed in claim 2, wherein when receiving a signal, the antenna transmits the received echo signal to the two-stage down-mixing module through the circulator switch control, and the echo signal is subjected to frequency mixing, filtering and amplification by the two-stage down-mixing module to obtain an intermediate frequency echo signal.
4. The RF front-end of a pulse compression missile-borne detector as claimed in claim 2, wherein the IF signal source generates a frequency f when modulated by intra-pulse phase coding0Of the intermediate frequency signal S0(t) phase shifter performs 0/pi phase modulation, signal S1(t) passing throughModulated by a phase shifter to generate S5(t) signal, intermediate frequency signal S0(t) are respectively associated with the signal S5(t) is subjected to first-stage up-conversion, filtering and power amplification by the two-stage up-mixing module to obtain a signal S6(t), signal S6(t) and then the second local oscillator signal S2(t) second up-conversion, filtering and power amplification are carried out by the two-stage up-mixing module to obtain the frequency f0+f1+f2Is transmitted signal S7(t), signal S4(t) and the signal S7And (t) the signals are alternately transmitted from the antenna in time-sharing mode, so that the linear frequency modulation and the phase coding time-sharing composite modulation in the pulse are realized.
5. The RF front end of a pulse compression missile-borne detector according to claim 4, characterized in that when receiving signals, the antenna transmits the received echo signals to the two-stage down-mixing module through the control of the circulator switch, and the echo signals are subjected to frequency mixing, filtering and amplification by the two-stage down-mixing module to obtain intermediate-frequency echo signals.
6. The rf front-end of a pulse compression missile-borne detector of claim 1, wherein the rf front-end is adapted for K-band and above.
7. The RF front end of a pulse compression missile-borne detector as claimed in claim 2 or 4, wherein the first local oscillator signal source module comprises a first voltage-controlled oscillator and a first power divider, and the output frequency of the first voltage-controlled oscillator is f1The signal is divided into two parts by the first power divider, one path of signal is connected with the phase shifter, and the other path of signal is connected with the two-stage down-mixing module.
8. The RF front end of a pulse compression missile-borne detector according to claim 2 or 4, characterized in that the second local oscillator signal source module comprises a second voltage-controlled oscillator, a quadrupler and a second power divider; the second voltage controlled oscillator outputs a frequency f2The/4 signal is processed by a quadrupler to obtain the frequency f2The signal is divided into two parts by the second power dividerThe two-stage up-mixing module and the two-stage down-mixing module are connected with each other.
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| CN113794483B (en) | 2022-06-28 |
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