CN110166064B - Novel Gaussian passband intermediate frequency receiver - Google Patents
Novel Gaussian passband intermediate frequency receiver Download PDFInfo
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- CN110166064B CN110166064B CN201811558865.4A CN201811558865A CN110166064B CN 110166064 B CN110166064 B CN 110166064B CN 201811558865 A CN201811558865 A CN 201811558865A CN 110166064 B CN110166064 B CN 110166064B
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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
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
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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
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/12—Neutralising, balancing, or compensation arrangements
Abstract
The invention provides a novel Gaussian passband intermediate frequency receiver which consists of a front stage and a rear stage and comprises a low noise amplifier, an attenuation matching network, a front stage Gaussian filter, a rear stage Gaussian filter, a numerical control attenuator, a broadband gain amplifier and a broadband mixer, wherein the front stage and the rear stage are connected with the low noise amplifier; the low noise amplifier is connected with the attenuation matching network, the preceding stage Gaussian filter, the numerical control attenuator, the broadband gain amplifier and the broadband mixer to form a first stage process, and then is sequentially connected with the broadband gain amplifier, the attenuation matching network, the succeeding stage Gaussian filter, the numerical control attenuator, the broadband gain amplifier and the final stage drive amplifier to form a second stage process. The invention is based on the Gaussian filter, and achieves the purposes of reducing the noise power in the signal passband of the receiver and eliminating the impact and ringing phenomena of the modulation pulse signal by utilizing the characteristics of small in-band group delay fluctuation, high phase linearity and the like of the filter. Meanwhile, the broadband design is adopted, and the information quantity of available signals is increased so as to improve the detection accuracy of a receiver system.
Description
Technical Field
The invention relates to a novel Gaussian passband intermediate frequency receiver.
Background
In the working process of the semi-active radar seeker, due to the fact that the irradiated signal spectrum is not pure, phase noise in the signal, local oscillator phase noise sidebands which are modulated to enter a signal channel and clutter signals easily enter a speed gate, and a receiver system cannot detect the minimum target signal. Therefore, how to reduce noise power, phase noise sidebands and clutter in a signal channel of a receiver system, namely, the anti-leakage and clutter technology, is one of the technical difficulties in the development process of the semi-active radar seeker. For how to improve the visibility index of a receiver system, the common method is to compress a speed gate or a signal channel bandwidth to reduce the power of phase noise irradiating a leakage signal and a clutter signal entering a signal channel and reduce the influence of the system on the target detection capability.
Usually, in the design of an intermediate frequency receiver, a narrowband design is generally adopted, and the channel bandwidth is between 1kHz and 5kHz, so that the phase noise power of an irradiation leakage signal entering a signal channel is greatly reduced, the visibility under leakage and the visibility under clutter of a guide receiver system can be effectively improved, and the circuit schematic block diagram is shown in fig. 1. In a narrow band intermediate frequency receiver design, the passband bandwidth is determined by the narrow band filter bandwidth. However, due to the transfer function characteristics of the narrow-band filter, the group delay fluctuation of the signal at the sideband of the passband is large, and the in-band group delay fluctuation is as shown in fig. 2. It can be seen from the figure that the group delay fluctuation at the sideband of the pass band is large, the signal distortion is serious, the phase noise in the signal channel is deteriorated, and the noise power is increased. Meanwhile, the narrow-band filter has the characteristics of serious impulse response and step response, so that the front end and the rear end of the modulation pulse have serious impact and ringing phenomena, and the loss of signal information content in the pulse width is caused. Therefore, although the intermediate frequency receiver designed by the narrow band filter can effectively reduce the noise power of the irradiation leakage signal entering the signal channel, the noise power in the channel is increased due to the characteristic of the narrow band filter, and the visibility and other indexes under the system leakage cannot be greatly improved.
Disclosure of Invention
In order to solve the technical problem, the invention provides a novel Gaussian passband intermediate frequency receiver which consists of a front stage and a rear stage and comprises a low noise amplifier, an attenuation matching network, a preceding stage Gaussian filter, a subsequent stage Gaussian filter, a numerical control attenuator, a broadband gain amplifier and a broadband mixer; the low noise amplifier is connected with the attenuation matching network, the preceding stage Gaussian filter, the numerical control attenuator, the broadband gain amplifier and the broadband mixer to form a first stage process, and then is sequentially connected with the broadband gain amplifier, the attenuation matching network, the succeeding stage Gaussian filter, the numerical control attenuator, the broadband gain amplifier and the final stage drive amplifier to form a second stage process.
The invention is realized by the following technical scheme.
The invention provides a novel Gaussian passband intermediate frequency receiver which consists of a front stage and a rear stage and comprises a low noise amplifier, an attenuation matching network, a front stage Gaussian filter, a rear stage Gaussian filter, a numerical control attenuator, a broadband gain amplifier and a broadband mixer, wherein the front stage and the rear stage are connected with the low noise amplifier; the low noise amplifier is connected with the attenuation matching network, the preceding stage Gaussian filter, the numerical control attenuator, the broadband gain amplifier and the broadband mixer to form a first stage process, and then is sequentially connected with the broadband gain amplifier, the attenuation matching network, the succeeding stage Gaussian filter, the numerical control attenuator, the broadband gain amplifier and the final stage drive amplifier to form a second stage process.
The low noise amplifier amplifies a front end input signal.
The attenuation matching network comprises a resistor R1, a resistor R2, a resistor R3, a capacitor C1 and a capacitor C2, wherein the resistor R1, the resistor R2 and the resistor R3 form a pi-type attenuation network, and the capacitor C1 and the capacitor C2 are respectively connected with the pi-type network in parallel at two ends of the attenuation matching network to adjust the circuit distribution parameters of the input end and the output end of the filter. The attenuation matching network isolates the filter from the broadband amplifier or the broadband mixer, reduces frequency offset caused by broadband change, and simultaneously adjusts the matching of the input end and the output end of the filter and eliminates the influence of circuit board distribution parameters on the band-shaped linearity of the passband.
The pre-stage Gaussian filter filters the intermediate frequency signal, ensures the linearity of a signal channel Gaussian band shape, and reduces in-band and sideband phase noise.
The post-stage Gaussian filter filters the intermediate frequency signal, ensures the linearity of a Gaussian band shape of a signal channel, and reduces in-band and sideband phase noise.
The numerical control attenuator receives the digital attenuation signal, adjusts the attenuation of the attenuator and expands the dynamic range of the signal channel gain.
The broadband gain amplifier expands the channel gain and performs gain amplification on signals.
The broadband mixer converts the frequency of the signal.
The final drive amplifier drives the circuit and buffers and isolates incoming signals.
The invention has the beneficial effects that: based on the Gaussian filter, the filter has the characteristics of small in-band group delay fluctuation, high phase linearity, smooth unit impulse response and unit step response and the like, and achieves the purposes of reducing the noise power in the signal pass band of the receiver and eliminating the impact and ringing phenomena of the modulation pulse signal. Meanwhile, the broadband design is adopted, and the information quantity of available signals is increased so as to improve the detection accuracy of a receiver system.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a schematic circuit diagram of the attenuation matching network of the present invention.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
A novel Gaussian passband intermediate frequency receiver consists of a front stage and a rear stage and comprises a low noise amplifier, an attenuation matching network, a front stage Gaussian filter, a rear stage Gaussian filter, a numerical control attenuator, a broadband gain amplifier and a broadband mixer; the low noise amplifier is connected with the attenuation matching network, the preceding stage Gaussian filter, the numerical control attenuator, the broadband gain amplifier and the broadband mixer to form a first stage process, and then is sequentially connected with the broadband gain amplifier, the attenuation matching network, the succeeding stage Gaussian filter, the numerical control attenuator, the broadband gain amplifier and the final stage drive amplifier to form a second stage process.
The low noise amplifier amplifies a front end input signal.
The attenuation matching network comprises a resistor R1, a resistor R2, a resistor R3, a capacitor C1 and a capacitor C2, wherein the resistor R1, the resistor R2 and the resistor R3 form a pi-type attenuation network, and the capacitor C1 and the capacitor C2 are respectively connected with the pi-type network in parallel at two ends of the attenuation matching network to adjust the circuit distribution parameters of the input end and the output end of the filter. The attenuation matching network isolates the filter from the broadband amplifier or the broadband mixer, reduces frequency offset caused by broadband change, and simultaneously adjusts the matching of the input end and the output end of the filter and eliminates the influence of circuit board distribution parameters on the band-shaped linearity of the passband.
The pre-stage Gaussian filter filters the intermediate frequency signal, ensures the linearity of a signal channel Gaussian band shape, and reduces in-band and sideband phase noise.
The numerical control attenuator receives the digital attenuation signal, adjusts the attenuation of the attenuator and expands the dynamic range of the signal channel gain.
The broadband gain amplifier expands the channel gain and performs gain amplification on signals.
The broadband mixer converts the frequency of the signal.
The post-stage Gaussian filter filters the mixed signals, the filtering range of the post-stage Gaussian filter is different from that of the pre-stage Gaussian filter, the linearity of Gaussian band shapes of signal channels is guaranteed after filtering, and in-band and sideband phase noises are reduced.
The final drive amplifier drives the circuit and buffers and isolates incoming signals.
The invention adopts the structure of 'attenuation matching network-Gaussian filter-attenuation matching network', the front and back attenuation matching networks respectively adjust the capacitance and resistance parameters in the attenuation matching network according to the matching of the input/output ends of the filter, and the influence of the distribution parameters of the circuit board on the band-shaped linearity of the pass band is eliminated, thereby improving the linearity of the output waveform.
The working principle of the invention is as follows: the first intermediate frequency signal is input into a low noise amplifier for gain amplification and then enters an attenuation matching network, the capacitance and resistance parameters of the front attenuation matching network and the rear attenuation matching network are adjusted according to the waveform of the signal to improve the waveform linearity, the signal is transmitted to a preceding stage Gaussian filter for filtering, a Gaussian curve waveform signal is output, the output signal and an external digital attenuation signal respectively enter two channels of a numerical control attenuator, the attenuation amount is adjusted by the digital attenuation signal to control the channel gain dynamic range of the whole receiver, the output signal enters a broadband gain amplifier for gain further amplification, the output signal and an externally input second local oscillation signal are subjected to frequency conversion in a broadband mixer to output a second intermediate frequency signal, the second intermediate frequency signal enters the broadband gain amplifier for gain amplification, the output signal enters the attenuation matching network again, the capacitance, the resistance and the like of the front attenuation matching network and the rear attenuation matching network are adjusted according to, Resistance parameters improve waveform linearity, signals are transmitted to a post-stage Gaussian filter for filtering, signals with Gaussian curve waveforms are output, the signals enter one channel of a numerical control attenuator, external digital attenuation signals are input into the other channel to control attenuation, the dynamic range of channel gain of a receiver is adjusted, the output signals are subjected to gain amplification through a broadband gain amplifier, and finally the output signals are output to a post-stage signal processor through a final-stage driving amplifier for signal processing.
Claims (4)
1. The utility model provides a novel gaussian passband intermediate frequency receiver comprises front and back two-stage, including low noise amplifier, decay matching network, preceding stage gaussian filter, back level gaussian filter, numerical control attenuator, broadband gain amplifier, broadband mixer, its characterized in that: the low noise amplifier, the attenuation matching network, the preceding Gaussian filter, the numerical control attenuator and the broadband gain amplifier are sequentially connected to form a first-stage process, the broadband gain amplifier, the attenuation matching network, the subsequent Gaussian filter, the numerical control attenuator, the broadband gain amplifier and the final-stage drive amplifier are sequentially connected to form a second-stage process, and the broadband mixer is used for connecting the first-stage process and the second-stage process;
the preceding stage Gaussian filter filters signals, ensures the linearity of Gaussian banding of a signal channel, and reduces in-band and sideband phase noises;
the post-stage Gaussian filter filters signals, ensures the linearity of Gaussian banding of a signal channel, and reduces in-band and sideband phase noises;
the numerical control attenuator receives the digital attenuation signal, adjusts the attenuation of the attenuator and expands the dynamic range of the signal channel gain;
the broadband gain amplifier expands the channel gain and performs gain amplification on the signal;
the broadband mixer converts the frequency of the signal.
2. A novel gaussian passband if receiver as defined in claim 1 wherein: the low noise amplifier amplifies a front end input signal.
3. A novel gaussian passband if receiver as defined in claim 1 wherein: the attenuation matching network comprises a resistor R1, a resistor R2, a resistor R3, a capacitor C1 and a capacitor C2, wherein the resistor R1, the resistor R2 and the resistor R3 form a pi-type attenuation network, and the capacitor C1 and the capacitor C2 are respectively connected with the pi-type network in parallel at two ends of the attenuation matching network to adjust the circuit distribution parameters of the input end and the output end of the filter.
4. A novel gaussian passband if receiver as defined in claim 1 wherein: the final drive amplifier drives the circuit and buffers and isolates incoming signals.
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| CN201811558865.4A CN110166064B (en) | 2018-12-19 | 2018-12-19 | Novel Gaussian passband intermediate frequency receiver |
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| CN201811558865.4A CN110166064B (en) | 2018-12-19 | 2018-12-19 | Novel Gaussian passband intermediate frequency receiver |
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| CN110166064B true CN110166064B (en) | 2021-04-30 |
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| TW374271B (en) * | 1998-04-23 | 1999-11-11 | Winbond Electronics Corp | GFSK radio frequency transceiver of ISM band |
| US20030050014A1 (en) * | 2001-09-10 | 2003-03-13 | Cain Peter John | Measurement of wideband signals |
| US7158772B1 (en) * | 2002-01-18 | 2007-01-02 | Lsi Logic Corporation | Filter for broadcast receiver tuner |
| CN103401828A (en) * | 2013-07-30 | 2013-11-20 | 四川九洲空管科技有限责任公司 | DPSK radio frequency demodulating receiver |
| CN104410410B (en) * | 2014-11-27 | 2017-09-01 | 江汉大学 | A kind of pulse signal source device |
| CN205232205U (en) * | 2015-12-01 | 2016-05-11 | 陕西烽火实业有限公司 | Digital ultrashort wave anti jamming unit and system |
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Effective date of registration: 20230117 Address after: 550009 No.7 Honghe Road, economic and Technological Development Zone, Guiyang City, Guizhou Province Patentee after: Aerospace Jiangnan Group Co.,Ltd. Patentee after: GUIZHOU AEROSPACE ELECTRONIC TECHNOLOGY Co.,Ltd. Address before: 550009, Honghe Road, Xiaohe District, Guizhou, Guiyang 7 Patentee before: GUIZHOU AEROSPACE ELECTRONIC TECHNOLOGY Co.,Ltd. |
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