CN113300730A - Receiver unit of II instrument landing equipment course beacon far field monitoring equipment - Google Patents
Receiver unit of II instrument landing equipment course beacon far field monitoring equipment Download PDFInfo
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- CN113300730A CN113300730A CN202110676150.4A CN202110676150A CN113300730A CN 113300730 A CN113300730 A CN 113300730A CN 202110676150 A CN202110676150 A CN 202110676150A CN 113300730 A CN113300730 A CN 113300730A
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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
- H04B1/16—Circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/16—Multiple-frequency-changing
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
Abstract
The invention provides a receiver unit of a navigation beacon far-field monitoring device of a II instrument landing device, which comprises: the input rf amplifier is connected to the mixer, the frequency synthesizer is connected to the mixer, the mixer is further connected to the if amplifier circuit, the if amplifier circuit is further connected to the detector circuit, and the mixer includes: a first mixer, an input end of the first mixer is connected with an output end of the amplifier; the intermediate frequency amplifying circuit includes: the input end of the band-pass filter is connected with the output end of the first mixer, and the output end of the band-pass filter is connected with the input end of the first intermediate frequency amplifier; the detection circuit includes: the device comprises an AGC controller, a low-pass detector, an absolute value detection circuit, a second intermediate frequency amplifier, a second mixer and a local oscillator.
Description
Technical Field
The invention relates to the technical field of communication navigation, in particular to a receiver unit of a far-field monitoring device of a navigation beacon of a II instrument landing device.
Background
The receiver unit is a core unit of the course beacon far-field monitoring equipment, and the last-generation domestic instrument landing equipment is I-type equipment and does not have the function of far-field monitoring. The new generation of domestic instrument landing equipment is class II landing equipment which conforms to the international civil aviation accessory 10, and the new generation of domestic instrument landing equipment must have a course far-field monitoring function according to requirements, and the receiver unit is a necessary component for receiving a far-field monitoring signal and realizing the far-field monitoring function.
Disclosure of Invention
The object of the present invention is to solve at least one of the technical drawbacks mentioned.
To this end, the invention aims to provide a receiver unit of a II instrument landing equipment course beacon far-field monitoring equipment.
In order to achieve the above object, an embodiment of the present invention provides a receiver unit of a II instrument landing device heading beacon far-field monitoring device, including:
input to a radio frequency amplifier, a frequency synthesizer, a mixer, an intermediate frequency amplifying circuit and a detecting circuit,
said input RF amplifier being connected to said mixer, said frequency synthesizer being connected to said mixer, said mixer being further connected to said IF amplification circuit, said IF amplification circuit being further connected to said detector circuit,
wherein the frequency synthesizer comprises: the phase-locked loop frequency synthesizer, the low-pass filter, the voltage-controlled oscillator, the amplifier and the dual-mode prescaler, wherein the input end of the phase-locked loop frequency synthesizer is connected with a frequency setting instruction, the output end of the phase-locked loop frequency synthesizer is connected with the input end of the low-pass filter, the output end of the low-pass filter is connected with the input end of the voltage-controlled oscillator, the output end of the voltage-controlled oscillator is respectively connected with the input end of the amplifier and the input end of the dual-mode prescaler, and the output end of the dual-mode prescaler is connected with the input end of the phase-locked loop frequency synthesizer;
the mixer includes: a first mixer, an input end of the first mixer is connected with an output end of the amplifier;
the input radio frequency amplifier includes: the radio frequency mixer comprises a high-pass filter, an electrically tunable attenuator and a high-frequency amplifier, wherein the input end of the high-pass filter is connected with a radio frequency signal, the output end of the high-pass filter is connected with the input end of the electrically tunable attenuator, the output end of the electrically tunable attenuator is connected with the input end of the high-frequency amplifier, and the output end of the high-frequency amplifier is connected with the input end of the first mixer;
the intermediate frequency amplifying circuit includes: the input end of the band-pass filter is connected with the output end of the first mixer, and the output end of the band-pass filter is connected with the input end of the first intermediate frequency amplifier;
the detection circuit includes: the automatic gain control device comprises an AGC controller, a low-pass detector, an absolute value detection circuit, a second intermediate frequency amplifier, a second mixer and a local oscillator, wherein the second mixer is bidirectionally connected with the first intermediate frequency amplifier, the output end of the second mixer is connected with the input end of the second intermediate frequency amplifier, the output end of the second intermediate frequency amplifier is connected with the input end of the absolute value detection circuit, the output end of the absolute value detection circuit is connected with the input end of the low-pass detector, and the low-pass detector outputs a baseband signal; the output end of the low-pass detector is connected with the input end of the AGC controller, and the output end of the AGC controller outputs an AGC voltage signal to the first intermediate-frequency amplifier; and the AGC controller outputs control voltage to the electrically-regulated attenuator.
Further, a radio frequency signal from the host is connected to the high-pass filter through a high-frequency cable, the control voltage from the detector controls the attenuation of the electrically-tuned attenuator to the radio frequency signal, the output of the electrically-tuned attenuator is coupled to the input radio frequency amplifier through a capacitor, and the amplified radio frequency signal is fed to the frequency mixer to be mixed with the local oscillation signal.
Further, when the loop is locked, the voltage-controlled oscillator oscillates a sine wave, the frequency is a stable correct value, the waveform oscillated by the voltage-controlled oscillator is amplified by the amplifier and then input to the mixer as a local oscillation signal of the mixer, and a local oscillation frequency of the first radio frequency signal frequency 10.725MHz is generated according to the received radio frequency signal.
Further, an amplified radio frequency input signal is coupled to a first input of a mixer to which a local oscillator signal from a frequency synthesizer is applied at a second input of the mixer, wherein a difference frequency between the radio frequency input signal and the local oscillator signal forms a first intermediate frequency of 10.725MHz, the mixer outputs a local oscillator signal having a frequency of 10.725MHz lower than the radio frequency, and an output load of the mixer is comprised of a resonant circuit.
Further, the IF signal is applied via a crystal filter to an input of a first IF amplifier having a wideband amplifier therein and a gain applied to an AGC voltage control terminal of said first IF amplifier, said first IF amplifier output being resonant at 10.725MHz, the IF signal being coupled to said detector circuit.
Further, the second local oscillator and mixer comprises a crystal oscillator and a double balanced mixer, wherein the crystal oscillator has a frequency of 10.675MHz, the local oscillator frequency is fed to the LO terminal of the mixer, the 10.725MHz first intermediate frequency signal is fed to the RF terminal of the mixer, the difference frequency of the mixer is the second intermediate frequency of the receiver, namely 50kHz, the second intermediate frequency amplifying circuit is a non-tuned two-stage amplifier, and the second intermediate frequency amplifying circuit is composed of a two-stage broadband amplifier, and comprises: the front stage of the first stage amplifier is a low-pass filter which is used for suppressing sum frequency components in the output signal of the mixer.
Further, the absolute value detection circuit includes: the detector comprises a first broadband operational amplifier, a second broadband operational amplifier, a first diode and a second diode, wherein the first diode and the second diode are included in a feedback loop and used for eliminating temperature influence, and the detector is closer to linearity by the high gain of the operational amplifier and the adoption of a feedback technology;
the low-pass filter adopts a 3kHz low-pass filter, the low-pass filter is a second-order Butterworth filter and consists of an operational amplifier, the operational amplifier attenuates a second intermediate frequency component of 50kHz, therefore, a baseband signal consists of a direct-current component and a modulation component, and the adjustment and calibration of the direct-current component, the modulation degree and parameters are completed through an offset adjusting potentiometer of the operational amplifier.
Further, the AGC amplifier is composed of an operational amplifier, an absolute value detector is in a specific radio frequency input range, the gain of the operational amplifier and the direct current voltage of the operational amplifier keep a constant intermediate frequency level, modulation components are eliminated through an integrating capacitor, a radio frequency level output circuit is composed of an integrated operational amplifier, and when a radio frequency input signal changes from a minimum level to a maximum level, the integrated operational amplifier translates the AGC voltage of the operational amplifier into a direct current voltage changing from 0V to 5V.
Furthermore, the frequency synthesizer adopts a dual-mode CMOS large-scale monolithic phase-locked frequency synthesizer programmed by 16-bit parallel codes, and integrates a reference frequency divider, a reference oscillator, a digital phase discriminator and a logic control circuit.
Further, the mixer comprises a mixer, an intermediate frequency transformer and a capacitor in the resonant circuit, wherein the mixer is connected with the intermediate frequency transformer, the intermediate frequency transformer is connected with the capacitor, the amplified radio frequency input signal is coupled to a first input end of the mixer, the local oscillator signal from the frequency synthesizer is applied to a second input end, the difference frequency of the radio frequency input signal and the local oscillator signal forms a first intermediate frequency of 10.725MHz, and the local oscillator frequency output by the mixer is lower than the radio frequency 10.725 MHz; the output load of the mixer consists of a resonant circuit intermediate frequency transformer and a capacitor, and an intermediate frequency signal on the secondary side of the intermediate frequency transformer is coupled to the crystal filter.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a block diagram of a receiver unit of a II instrument landing device heading beacon far-field monitoring device according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of an input RF amplifier according to an embodiment of the present invention;
FIG. 3 is a circuit diagram of a mixer according to an embodiment of the invention;
fig. 4 is a circuit diagram of an intermediate frequency amplifying circuit according to an embodiment of the present invention;
fig. 5 is a circuit diagram of a frequency synthesizer according to an embodiment of the present invention;
fig. 6 is a circuit diagram of a detector circuit according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The invention relates to a receiver unit of a course beacon far-field monitoring device of a II instrument landing device, which is used as a receiver unit of a beacon far-field monitoring device. The receiver unit can be applied to the navigation beacon far-field monitoring equipment of the class II instrument landing equipment, and due to the adoption of the modular design, the performance is stable, the system performance requirement is met, and the far-field monitoring function is completed.
The invention relates to a receiver unit of a heading beacon far-field monitoring device of a II instrument landing device, which adopts an input radio frequency amplifier, a frequency synthesizer, a frequency mixer, an intermediate frequency amplifying circuit and a detection circuit. The baseband signal and the radio frequency level signal generated by the detection are transmitted to the monitor unit through the interface, and are processed digitally to obtain technical parameters. The operating frequency point of the course receiver is set by the software of the digital processing unit. The radio frequency signal is from a radio frequency input port of the device. Wherein: the input radio frequency amplifier is connected with the frequency mixer, the frequency synthesizer is connected with the frequency mixer, the frequency mixer is connected with the intermediate frequency amplifying circuit, and the intermediate frequency amplifying circuit is connected with the detection circuit. The detection circuit is characterized in that: including a second mixer, a second intermediate frequency amplifier, an absolute value detector, a 3kHz low pass filter, an AGC amplifier, and a radio frequency LEVEL (RF LEVEL) output circuit. Wherein: the second mixer is connected with a second intermediate frequency amplifier, the second intermediate frequency amplifier is connected with an absolute value detector, the absolute value detector is connected with a 3kHz low-pass filter, the 3kHz low-pass filter is connected with an AGC amplifier, and the AGC amplifier is connected with a radio frequency LEVEL (RF LEVEL) output circuit.
As shown in fig. 1, a receiver unit of a II instrument landing device heading beacon far-field monitoring device according to an embodiment of the present invention includes: input to rf amplifier 100, frequency synthesizer 200, mixer 300, if amplifier circuit 400 and detector circuit 500.
Specifically, input rf amplifier 100 is connected to mixer 300, frequency synthesizer 200 is connected to mixer 300, mixer 300 is further connected to intermediate frequency amplifier circuit 400, and intermediate frequency amplifier circuit 400 is further connected to detector circuit 500.
The frequency synthesizer 200 includes: the phase-locked loop frequency synthesizer 200, the low-pass filter, the voltage-controlled oscillator, the amplifier and the dual-mode prescaler, wherein the input end of the phase-locked loop frequency synthesizer 200 is connected with a frequency setting instruction, the output end of the phase-locked loop frequency synthesizer 200 is connected with the input end of the low-pass filter, the output end of the low-pass filter is connected with the input end of the voltage-controlled oscillator, the output end of the voltage-controlled oscillator is respectively connected with the input end of the amplifier and the input end of the dual-mode prescaler, and the output end of the dual-mode prescaler is connected with the input end of the phase-locked loop frequency synthesizer 200.
The mixer 300 includes: a first mixer 300, an input of the first mixer 300 being connected to an output of the amplifier.
The input radio frequency amplifier 100 includes: the radio frequency signal transmission device comprises a high-pass filter, an electrically tunable attenuator and a high-frequency amplifier, wherein the input end of the high-pass filter is connected with a radio frequency signal, the output end of the high-pass filter is connected with the input end of the electrically tunable attenuator, the output end of the electrically tunable attenuator is connected with the input end of the high-frequency amplifier, and the output end of the high-frequency amplifier is connected with the input end of the first mixer 300.
The intermediate frequency amplifying circuit 400 includes: a band pass filter and a first intermediate frequency amplifier, wherein an input terminal of the band pass filter is connected to an output terminal of the first mixer 300, and an output terminal of the band pass filter is connected to an input terminal of the first intermediate frequency amplifier.
The detector circuit 500 includes: the digital signal processing device comprises an AGC controller, a low-pass detector, an absolute value detection circuit 500, a second intermediate frequency amplifier, a second mixer 300 and a local oscillator, wherein the second mixer 300 is bidirectionally connected with the first intermediate frequency amplifier, the output end of the second mixer 300 is connected with the input end of the second intermediate frequency amplifier, the output end of the second intermediate frequency amplifier is connected with the input end of the absolute value detection circuit 500, the output end of the absolute value detection circuit 500 is connected with the input end of the low-pass detector, and the low-pass detector outputs a baseband signal; the output end of the low-pass detector is connected with the input end of the AGC controller, and the output end of the AGC controller outputs an AGC voltage signal to the first intermediate-frequency amplifier; and the AGC controller outputs control voltage to the electrically-regulated attenuator.
The receiver unit of the II instrument landing device heading beacon far-field monitoring device of the present invention is described in detail below with reference to fig. 2 to 6.
The invention provides a receiver unit of a navigation beacon far-field monitoring device of a II instrument landing device, wherein a baseband signal and a radio frequency level signal generated by detection are transmitted to a monitor unit through an interface for digital processing to obtain technical parameters. The operating frequency point of the course receiver is set by the software of the digital processing unit. The radio frequency signal is from a radio frequency input port of the device. Wherein: input rf amplifier 100 is connected to mixer 300, frequency synthesizer 200 is connected to mixer 300, mixer 300 is connected to intermediate frequency amplifier circuit 400, and intermediate frequency amplifier circuit 400 is connected to detector circuit 500. The detector circuit 500 is characterized in that: including a second mixer 300, a second intermediate frequency amplifier, an absolute value detector, a 3kHz low pass filter, an AGC amplifier, and a radio frequency LEVEL (RF LEVEL) output circuit. Wherein: the second mixer 300 is connected to a second if amplifier, which is connected to an absolute value detector, which is connected to a 3kHz low pass filter, which is connected to an AGC amplifier, which is connected to a radio frequency LEVEL (RF LEVEL) output circuit.
The receiver unit of the heading beacon far-field monitoring equipment of the II-type instrument landing equipment is in a superheterodyne receiving form, and comprises a baseband signal output port, a frequency measurement signal output port, a level measurement signal output port and an input port (comprising + 12V-12V power supply, GND, CLK, DATA, ENB signal and radio frequency input) besides the main components.
As shown in fig. 2, a radio frequency signal (RF) received via an antenna is input to a radio frequency input of the heading receiver, and the input radio frequency amplifier 100 includes a high pass filter Z1, an electrically tuned attenuator N1, and a high frequency broadband amplifier N2, wherein: radio frequency signals from a host are connected to a 108MHz high-pass filter through a high-frequency cable, a control voltage from a detector controls the attenuation of an electric tuning attenuator N1 to the radio frequency signals, the output of N1 is coupled to an integrated broadband amplifier N2 through a capacitor, and the amplified radio frequency signals are fed to a mixer 300N3 to be mixed with local oscillation signals.
As shown in fig. 5, the frequency synthesizer 200 includes a frequency synthesizer 200N5, a low pass filter N6, a voltage controlled oscillator N8, a dual mode prescaler N7, and an amplifier N9, wherein: the frequency synthesizer 200N5 is connected to a low pass filter N6 and a dual mode prescaler N7, respectively, the output of the low pass filter N6 is connected to a voltage controlled oscillator N8, the output of the voltage controlled oscillator N8 is connected to the input of N7, and the output of the voltage controlled oscillator N8 is connected to the input of an amplifier N9. The frequency synthesizer 200N5 employs a dual-mode CMOS large-scale monolithic phase-locked frequency synthesizer 200 programmed with 16-bit parallel codes that integrates a reference frequency divider, a reference oscillator, a digital phase detector, various logic control circuits, and the like. And the N6, the N7 and the N8 form a loop, the frequency division ratio is automatically converted, and the frequency synthesis is realized. When the loop is locked, the vco N8 oscillates a sine wave with a stable correct frequency, and at this time, pins 7 and 8 of the frequency synthesizer 200N5 are at high level and are negative pulse waveform, and pin 9 is square wave waveform. The waveform oscillated by the voltage-controlled oscillator N8 is amplified by the amplifier N9, and is input to the mixer 300 as the local oscillation signal of the mixer 300, that is, the local oscillation frequency lower than the radio frequency signal frequency 10.725MHz is generated according to the received radio frequency signal.
As shown in fig. 3, the mixer 300 includes a mixer 300N3, an intermediate frequency transformer T1 in a resonant circuit, and a capacitor C24, wherein: the mixer 300N3 is connected to an intermediate frequency transformer T1, and the intermediate frequency transformer T1 is connected to a capacitor C24. The amplified rf input signal is coupled to pin 3 of the first input of the mixer 300N3, the local oscillator signal from the frequency synthesizer 200 is applied to pin 6 of the second input, the difference frequency between the rf input signal and the local oscillator signal forms a first intermediate frequency of 10.725MHz, and the local oscillator frequency is output by pin 2 of N3 to be lower than the rf frequency of 10.725 MHz. The output load of N3 is composed of resonant circuit T1, C35, and the if signal on the secondary of T1 is coupled to a crystal filter.
As shown in fig. 4, the intermediate frequency amplifying circuit 400 includes a crystal filter Z2, an integrated intermediate frequency amplifying circuit N4, and peripheral circuits such as capacitors C36 and C92, in which: the crystal filter Z2 is connected to capacitors C36 and C92, respectively, and C92 is connected to an integrated mid-discharge circuit N4. The center frequency of the crystal filter Z2 is 10.725MHz, the bandwidth is +/-20 kHz, the 60dB stop band attenuation reaches +/-100 kHz, and the selection characteristic of the heading receiver is mainly determined by the crystal filter. The capacitors C36 and C92 are used for correcting in-band ripples of the crystal filter. The intermediate frequency signal is applied to the input of a first intermediate amplifier N4 through a crystal filter. Within N4 is a wide band amplifier, the gain of which is controlled by the AGC voltage applied to pin 2 of N4. The mid-amplifier output is resonant at 10.725MHz and the intermediate frequency signal is coupled to detector circuit 500.
As shown in fig. 6, the detector circuit 500 includes a local oscillator/mixer 300, a second intermediate frequency amplifier, an absolute value detector, a 3kHz low pass filter, an AGC amplifier, a radio frequency LEVEL (RF LEVEL) output circuit, wherein: the second mixer 300 is connected to a second if amplifier, which is connected to an absolute value detector, which is connected to a 3kHz low pass filter, which is connected to an AGC amplifier, which is connected to a radio frequency LEVEL (RF LEVEL) output circuit. The second local oscillator/mixer 300 consists of a crystal oscillator G1 and a double balanced mixer 300N 10. The crystal oscillator frequency is 10.675MHz, the local oscillator frequency is fed to the L0 terminal of the mixer 300, the 10.725MHz first intermediate frequency signal is fed to the RF terminal of the mixer 300, and the difference frequency signal of the mixer 300 is the second intermediate frequency of the receiver, 50 kHz. The second intermediate frequency amplifying circuit 400 is a non-tuned two-stage amplifier composed of two stages of wide-band amplifiers N11 and N12, and the pre-stage of the amplifier N11 is a low-pass filter which suppresses the sum frequency component of the output signal of the mixer 300. The absolute value detector consists of two broadband operational amplifiers N13 and N14, and diodes V2 and V3. Diodes are included in the feedback loop in order to cancel the temperature effects, through the high gain of the operational amplifier and to make the detector more linear using feedback techniques. The 3kHz low pass filter is a second order butterworth filter consisting of an operational amplifier N15 which attenuates the 50kHz second intermediate frequency component, so that the baseband signal consisting of the dc component and the 90Hz, 150Hz modulation component is output at the 6 terminal of N15. The adjustment and calibration of the direct current component, the modulation degree and the parameters are completed through an offset adjusting potentiometer RP2 of the operational amplifier. The AGC amplifier is composed of an operational amplifier N16. The absolute value detector maintains a constant if level for the gain of N16 (R41/R40) and the dc voltage at the 12 th terminal of N16 over a particular rf input range. The modulation component is cancelled by the integrating capacitor C54. The RF level output circuit consists of an integrated operational amplifier N17, and when the RF input signal changes from a certain minimum level to a maximum level, N17 translates the AGC voltage at the 14 th terminal of N16 into a DC voltage that changes from 0V to 5V.
The invention can realize that the receiver unit can be applied to the navigation beacon far-field monitoring equipment of the class II instrument landing equipment, is used for monitoring and measuring far-field radiation signals, and meets the system performance requirement of the class II instrument landing equipment in the international civil aviation accessory 10.
Technical index of receiver unit
1) Frequency range: 108.1 MHz-111.95 MHz.
2) Frequency deviation: is better than +/-2X 10-5.
3) Channel spacing: 50 kHz.
4) Bandwidth: 6dB is better than +/-18 kHz.
5) And (3) selectivity: and when the nominal frequency is +/-100 kHz, the power is better than-45 dB.
6) Sensitivity: not inferior to-75 dBm.
7) AGC range: -20dBm to-75 dBm.
The receiver unit of the navigation beacon far-field monitoring equipment of the II instrument landing equipment is used for monitoring and measuring far-field radiation signals, and meets the system performance requirements of II instrument landing equipment in the international civil aviation accessory 10. Fills the domestic blank.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A receiver unit for a II instrument landing device course beacon far field monitoring device, comprising: input to a radio frequency amplifier, a frequency synthesizer, a mixer, an intermediate frequency amplifying circuit and a detecting circuit,
said input RF amplifier being connected to said mixer, said frequency synthesizer being connected to said mixer, said mixer being further connected to said IF amplification circuit, said IF amplification circuit being further connected to said detector circuit,
wherein the frequency synthesizer comprises: the phase-locked loop frequency synthesizer, the low-pass filter, the voltage-controlled oscillator, the amplifier and the dual-mode prescaler, wherein the input end of the phase-locked loop frequency synthesizer is connected with a frequency setting instruction, the output end of the phase-locked loop frequency synthesizer is connected with the input end of the low-pass filter, the output end of the low-pass filter is connected with the input end of the voltage-controlled oscillator, the output end of the voltage-controlled oscillator is respectively connected with the input end of the amplifier and the input end of the dual-mode prescaler, and the output end of the dual-mode prescaler is connected with the input end of the phase-locked loop frequency synthesizer;
the mixer includes: a first mixer, an input end of the first mixer is connected with an output end of the amplifier;
the input radio frequency amplifier includes: the radio frequency mixer comprises a high-pass filter, an electrically tunable attenuator and a high-frequency amplifier, wherein the input end of the high-pass filter is connected with a radio frequency signal, the output end of the high-pass filter is connected with the input end of the electrically tunable attenuator, the output end of the electrically tunable attenuator is connected with the input end of the high-frequency amplifier, and the output end of the high-frequency amplifier is connected with the input end of the first mixer;
the intermediate frequency amplifying circuit includes: the input end of the band-pass filter is connected with the output end of the first mixer, and the output end of the band-pass filter is connected with the input end of the first intermediate frequency amplifier;
the detection circuit includes: the automatic gain control device comprises an AGC controller, a low-pass detector, an absolute value detection circuit, a second intermediate frequency amplifier, a second mixer and a local oscillator, wherein the second mixer is bidirectionally connected with the first intermediate frequency amplifier, the output end of the second mixer is connected with the input end of the second intermediate frequency amplifier, the output end of the second intermediate frequency amplifier is connected with the input end of the absolute value detection circuit, the output end of the absolute value detection circuit is connected with the input end of the low-pass detector, and the low-pass detector outputs a baseband signal; the output end of the low-pass detector is connected with the input end of the AGC controller, and the output end of the AGC controller outputs an AGC voltage signal to the first intermediate-frequency amplifier; and the AGC controller outputs control voltage to the electrically-regulated attenuator.
2. The receiver unit of a II instrumentation landing equipment course beacon far field monitoring device of claim 1, wherein the rf signal from the host computer is connected to the high pass filter through a high frequency cable, the control voltage from the detector controls the attenuation of the rf signal by an electrically tuned attenuator, the output of the electrically tuned attenuator is coupled to the input rf amplifier through a capacitor, the amplified rf signal is fed to a mixer for mixing with the local oscillator signal.
3. The receiver unit of the II instrument landing gear heading beacon far-field monitoring device of claim 1, wherein when the loop is locked, the voltage controlled oscillator oscillates a sine wave with a stable correct frequency, the waveform oscillated by the voltage controlled oscillator is amplified by the amplifier and then input to the mixer as a local oscillator signal of the mixer, and a local oscillator frequency of 10.725MHz is generated according to the received rf signal.
4. The II instrument landing gear heading beacon far field monitoring device receiver unit of claim 1, wherein the amplified rf input signal is coupled to a first input of a mixer and a local oscillator signal from a frequency synthesizer is applied to a second input of the mixer, wherein a difference frequency between the rf input signal and the local oscillator signal forms a first intermediate frequency of 10.725MHz, the mixer outputs a local oscillator frequency of 10.725MHz less than the rf frequency, and an output load of the mixer is comprised of a resonant circuit.
5. The receiver unit of a II instrument landing gear course beacon far field monitoring device of claim 1, wherein the if signal is applied to an input of a first if amplifier through a crystal filter, said first if amplifier having a wideband amplifier therein, gain applied to an AGC voltage control terminal of said first if amplifier, said first if amplifier output being resonant at 10.725MHz, the if signal being coupled to said detector circuit.
6. The receiver unit of a II instrument landing gear heading beacon far-field monitoring device of claim 1, wherein the second local oscillator and the mixer comprise a crystal oscillator and a double balanced mixer, wherein the crystal oscillator is 10.675MHz in frequency, the local oscillator frequency is fed to the LO terminal of the mixer, 10.725MHz of the first intermediate frequency signal is fed to the RF terminal of the mixer, the difference frequency of the mixer is the second intermediate frequency of the receiver, 50kHz, the second intermediate frequency amplifying circuit is an un-tuned two-stage amplifier, comprising a two-stage broadband amplifier: the front stage of the first stage amplifier is a low-pass filter which is used for suppressing sum frequency components in the output signal of the mixer.
7. The II instrument landing device heading beacon far field monitoring device receiver unit of claim 1,
the absolute value detection circuit includes: the detector comprises a first broadband operational amplifier, a second broadband operational amplifier, a first diode and a second diode, wherein the first diode and the second diode are included in a feedback loop and used for eliminating temperature influence, and the detector is closer to linearity by the high gain of the operational amplifier and the adoption of a feedback technology;
the low-pass filter adopts a 3kHz low-pass filter, the low-pass filter is a second-order Butterworth filter and consists of an operational amplifier, the operational amplifier attenuates a second intermediate frequency component of 50kHz, therefore, a baseband signal consists of a direct-current component and a modulation component, and the adjustment and calibration of the direct-current component, the modulation degree and parameters are completed through an offset adjusting potentiometer of the operational amplifier.
8. The II instrument landing device heading beacon far field monitoring device receiver unit of claim 1,
the AGC amplifier is composed of an operational amplifier, an absolute value detector is in a specific radio frequency input range, the gain of the operational amplifier and the direct current voltage of the operational amplifier keep a constant intermediate frequency level, modulation components are eliminated through an integral capacitor, a radio frequency level output circuit is composed of an integrated operational amplifier, and when a radio frequency input signal changes from a minimum level to a maximum level, the integrated operational amplifier translates the AGC voltage of the operational amplifier into a direct current voltage changing from 0V to 5V.
9. The receiver unit of a II instrument landing device course beacon far field monitoring device of claim 1, wherein the frequency synthesizer employs a dual-mode CMOS large scale monolithic phase locked frequency synthesizer programmed with 16-bit parallel code, integrating a reference frequency divider, a reference oscillator, a digital phase detector and a logic control circuit.
10. The II instrument landing gear course beacon far field monitoring device receiver unit of claim 1, wherein the mixer includes a mixer, an intermediate frequency transformer and a capacitor in a resonant circuit, wherein the mixer is coupled to the intermediate frequency transformer, the intermediate frequency transformer is coupled to the capacitor, the amplified rf input signal is coupled to the first input of the mixer, the lo signal from the frequency synthesizer is applied to the second input, the difference frequency of the rf input signal and the lo signal forms a first intermediate frequency of 10.725MHz, the lo frequency output by the mixer is less than the rf frequency of 10.725 MHz; the output load of the mixer consists of a resonant circuit intermediate frequency transformer and a capacitor, and an intermediate frequency signal on the secondary side of the intermediate frequency transformer is coupled to the crystal filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110676150.4A CN113300730A (en) | 2021-06-18 | 2021-06-18 | Receiver unit of II instrument landing equipment course beacon far field monitoring equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110676150.4A CN113300730A (en) | 2021-06-18 | 2021-06-18 | Receiver unit of II instrument landing equipment course beacon far field monitoring equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113300730A true CN113300730A (en) | 2021-08-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110676150.4A Pending CN113300730A (en) | 2021-06-18 | 2021-06-18 | Receiver unit of II instrument landing equipment course beacon far field monitoring equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113300730A (en) |
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2021
- 2021-06-18 CN CN202110676150.4A patent/CN113300730A/en active Pending
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