CN114584157A - Ultra-wideband single-input multi-output microwave band receiver - Google Patents

Ultra-wideband single-input multi-output microwave band receiver Download PDF

Info

Publication number
CN114584157A
CN114584157A CN202210038553.0A CN202210038553A CN114584157A CN 114584157 A CN114584157 A CN 114584157A CN 202210038553 A CN202210038553 A CN 202210038553A CN 114584157 A CN114584157 A CN 114584157A
Authority
CN
China
Prior art keywords
frequency
handed
signal channel
power divider
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210038553.0A
Other languages
Chinese (zh)
Inventor
赵泽平
王晓岚
庞峰
陈志春
徐永杰
佘胜团
董峥
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GUANGZHOU RUNXIN INFORMATION TECHNOLOGY CO LTD
National Astronomical Observatories of CAS
Original Assignee
GUANGZHOU RUNXIN INFORMATION TECHNOLOGY CO LTD
National Astronomical Observatories of CAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by GUANGZHOU RUNXIN INFORMATION TECHNOLOGY CO LTD, National Astronomical Observatories of CAS filed Critical GUANGZHOU RUNXIN INFORMATION TECHNOLOGY CO LTD
Priority to CN202210038553.0A priority Critical patent/CN114584157A/en
Publication of CN114584157A publication Critical patent/CN114584157A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • H04B1/08—Constructional details, e.g. cabinet
    • 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
    • H04B1/005—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
    • H04B1/0067—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands
    • 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
    • H04B1/005—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
    • H04B1/0096—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges where a full band is frequency converted into another full band
    • 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
    • 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
    • H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

The invention discloses an ultra wide band single-input multi-output microwave band receiver, which comprises: the radio frequency front end comprises a front left-handed signal channel and a front right-handed signal channel, the output end of the front left-handed signal channel is connected with the first power divider, and the output end of the front right-handed signal channel is connected with the second power divider; the frequency conversion unit comprises a rear left-handed signal channel and a rear right-handed signal channel; the front left-handed signal channel and the front right-handed signal channel are connected with a first frequency synthesizer together, and the rear left-handed signal channel and the rear right-handed signal channel are connected with a second frequency synthesizer and a third frequency synthesizer together. The invention can simultaneously output the intermediate frequency signals of the same-phase left-handed channel and the right-handed channel of a plurality of different channels.

Description

Ultra-wideband single-input multi-output microwave band receiver
Technical Field
The invention relates to the technical field of microwave receiving, in particular to an ultra-wideband single-input multi-output microwave band receiver.
Background
Satellite communication is a common way of transmitting telecommunications at present. Most of the frequency bands adopted by the traditional satellite communication are microwave frequency bands, such as a C band, a Ka band and a Ku band. And because a plurality of channel signals need to be transmitted simultaneously, the bandwidth of the frequency band is wide. In a conventional microwave band receiver, signals of only one channel are generally received at a time, and switching of the channel is realized by configuration of an internal local oscillator. However, when signals of a plurality of channels need to be received simultaneously, only a plurality of receivers of a single channel can be used. The system built up in this way not only has high power consumption, but also has poor reliability.
The signal frequency band transmitted by one communication satellite can contain a plurality of channels, so that the transmission efficiency is improved. The same-frequency multiplexing of signals can be realized among different communication satellites through different polarization modes of the antenna. There are two common polarization modes used for antennas: left-handed polarization and right-handed polarization. The traditional receiver can only receive signals of one polarization mode at one time, and because the channels are independent and respectively have independent local oscillators, the cost and the power consumption of devices are increased, the phases of the left-handed channel and the right-handed channel cannot be consistent, and the application range is limited.
Disclosure of Invention
In order to solve the above problems, a primary object of the present invention is to provide an ultra wide band single input multiple output microwave band receiver, which can receive signals of left and right polarization modes and output intermediate frequency signals of the same phase left-handed channel and right-handed channel of a plurality of different channels, thereby solving the problems of inconsistent phase of the left-handed and right-handed channels, high power consumption of the device, and the like.
In order to achieve the purpose, the invention adopts the technical scheme that:
an ultra-wideband single-input-multiple-output microwave band receiver, comprising: the microwave band signal down-conversion device comprises a left-handed antenna, a right-handed antenna, a radio frequency front end, a first power divider, a second power divider and a plurality of frequency conversion units, wherein the radio frequency front end is used for down-converting a microwave band signal to an L band signal, and the frequency conversion units are used for converting the L band signal to an intermediate frequency signal;
the radio frequency front end comprises a front left-handed signal channel and a front right-handed signal channel, the input end of the front left-handed signal channel is connected with the left-handed antenna, the output end of the front left-handed signal channel is connected with the first power divider, the input end of the front right-handed signal channel is connected with the right-handed antenna, and the output end of the front right-handed signal channel is connected with the second power divider;
the frequency conversion unit comprises a rear left-handed signal channel and a rear right-handed signal channel, the input end of the rear left-handed signal channel is connected with the output end of the first power divider, and the input end of the rear right-handed signal channel is connected with the output end of the second power divider;
the front left-handed signal channel and the front right-handed signal channel are connected with a first frequency synthesizer together, and the rear left-handed signal channel and the rear right-handed signal channel are connected with a second frequency synthesizer and a third frequency synthesizer together.
Further, the front left-hand signal path includes: the low-noise amplifier is connected with the 3dB attenuator through the radio frequency down converter, the first harmonic filter and the amplifier in sequence, and the output end of the first frequency synthesizer is connected with the input end of the radio frequency down converter.
Further, the structure of the front right-hand signal channel is the same as the structure of the front left-hand signal channel.
Further, the rear left-hand signal path includes: the radio frequency amplifier is connected with the second intermediate frequency filter sequentially through the numerical control attenuator, the L waveband filter, the L waveband down converter, the filtering amplifying circuit, the intermediate frequency down converter, the first intermediate frequency filter, the AGC amplifier and the second intermediate frequency filter;
the input end of the L-band down converter is connected with the output end of the second frequency synthesizer, and the input end of the intermediate frequency down converter is connected with the output end of the third frequency synthesizer.
Further, the structure of the rear right-hand signal channel is the same as the structure of the rear left-hand signal channel.
Furthermore, the filtering and amplifying circuit comprises an amplifier and two acoustic surface filters, and the two acoustic surface filters are respectively connected to the input end and the output end of the amplifier.
Further, the microwave band receiver further comprises a 1-to-2 power divider, the first frequency synthesizer is connected with the radio frequency down converter through the 1-to-2 power divider, the second frequency synthesizer is connected with the L-band down converter through the 1-to-2 power divider, and the third frequency synthesizer is connected with the intermediate frequency down converter through the 1-to-2 power divider.
Further, the microwave band receiver further comprises a second harmonic filter, and the second harmonic filter is connected with the input end of the 1-in-2 power divider.
Further, the first frequency synthesizer, the second frequency synthesizer and the third frequency synthesizer all adopt an integer type or fractional type phase-locked loop structure.
Further, the first power divider and the second power divider are both 1-to-12 power dividers.
The invention has the beneficial effects that:
the present invention comprises: the multi-channel antenna comprises a left-handed antenna, a right-handed antenna, a radio frequency front end, a first power divider, a second power divider and a plurality of frequency conversion units, wherein multi-channel output can be realized through the first power divider and the second power divider; only one radio frequency front end is used, so that the cost and the power consumption of the device are reduced; the radio frequency front end comprises a front left-handed signal channel and a front right-handed signal channel, the frequency conversion unit comprises a rear left-handed signal channel and a rear right-handed signal channel, the front left-handed signal channel and the front right-handed signal channel share a first frequency synthesizer, and the rear left-handed signal channel and the rear right-handed signal channel share a second frequency synthesizer and a third frequency synthesizer, so that the radio frequency front end can simultaneously output intermediate frequency signals of the same-phase left-handed channel and the right-handed channel of a plurality of different channels, and the problems of inconsistent phase of the left-handed and right-handed channels, high equipment power consumption and the like are solved.
Drawings
FIG. 1 is a system block diagram of the present invention.
Fig. 2a is a schematic block diagram of the Ku band rf front end of the present invention.
Fig. 2b is a schematic block diagram of a C-band rf front end of the present invention.
Fig. 3 is a schematic diagram of a phase-locked loop structure according to the present invention.
Detailed Description
Referring to fig. 1, the present invention relates to an ultra-wideband single-input multiple-output microwave band receiver, comprising: the microwave band signal down-conversion device comprises a left-handed antenna, a right-handed antenna, a radio frequency front end, a first power divider, a second power divider and a plurality of frequency conversion units, wherein the radio frequency front end is used for down-converting a microwave band signal to an L band signal, and the frequency conversion units are used for converting the L band signal to an intermediate frequency signal;
the radio frequency front end comprises a front left-handed signal channel and a front right-handed signal channel, the input end of the front left-handed signal channel is connected with the left-handed antenna, the output end of the front left-handed signal channel is connected with the first power divider, the input end of the front right-handed signal channel is connected with the right-handed antenna, and the output end of the front right-handed signal channel is connected with the second power divider;
the frequency conversion unit comprises a rear left-handed signal channel and a rear right-handed signal channel, the input end of the rear left-handed signal channel is connected with the output end of the first power divider, and the input end of the rear right-handed signal channel is connected with the output end of the second power divider;
the front left-handed signal channel and the front right-handed signal channel are connected with a first frequency synthesizer together, the rear left-handed signal channel and the rear right-handed signal channel are connected with a second frequency synthesizer and a third frequency synthesizer together, and the reference frequencies of all the frequency synthesizers are connected with the same reference source.
In the scheme, the broadband signals are received at one time through the left-handed antenna and the right-handed antenna, and then the microwave band signals are converted into the L band through the radio frequency front end. In order to ensure the consistency of the phases, the mixer of the front left-hand signal channel and the mixer of the front right-hand signal channel share the same local oscillator signal f 1.
The first power divider and the second power divider can realize multi-path output; only one radio frequency front end is used, so that the cost and the power consumption of the device are reduced; the radio frequency front end comprises a front left-handed signal channel and a front right-handed signal channel, the frequency conversion unit comprises a rear left-handed signal channel and a rear right-handed signal channel, the front left-handed signal channel and the front right-handed signal channel share a first frequency synthesizer, and the rear left-handed signal channel and the rear right-handed signal channel share a second frequency synthesizer and a third frequency synthesizer, so that the radio frequency front end can simultaneously output intermediate frequency signals of the same-phase left-handed channel and the right-handed channel of a plurality of different channels, and the problems of inconsistent phase of the left-handed and right-handed channels, high equipment power consumption and the like are solved.
It should be noted that the left-handed channel is formed by sequentially connecting a front left-handed signal channel, a first power divider, and a rear left-handed signal channel, and the right-handed channel is formed by sequentially connecting a front right-handed signal channel, a second power divider, and a rear right-handed signal channel.
Further, the front left-handed signal path includes: the low-noise amplifier is connected with the 3dB attenuator through the radio frequency down converter, the first harmonic filter and the amplifier in sequence, and the output end of the first frequency synthesizer is connected with the input end of the radio frequency down converter.
Further, the front right-hand signal channel has the same structure as the front left-hand signal channel.
Further, the rear left-hand signal channel includes: the radio frequency amplifier is connected with the second intermediate frequency filter sequentially through the numerical control attenuator, the L waveband filter, the L waveband down converter, the filtering amplifying circuit, the intermediate frequency down converter, the first intermediate frequency filter, the AGC amplifier and the second intermediate frequency filter;
the input end of the L-band down converter is connected with the output end of the second frequency synthesizer, and the input end of the intermediate frequency down converter is connected with the output end of the third frequency synthesizer.
Further, the structure of the rear right-hand signal channel is the same as the structure of the rear left-hand signal channel.
Furthermore, the filtering and amplifying circuit comprises an amplifier and two acoustic meter filters (830MHz), and the two acoustic meter filters are respectively connected with the input end and the output end of the amplifier.
Further, the microwave band receiver further comprises a 1/2 power divider, the first frequency synthesizer is connected with the radio frequency down converter through the 1/2 power divider, the second frequency synthesizer is connected with the L-band down converter through the 1/2 power divider, and the third frequency synthesizer is connected with the intermediate frequency down converter through the 1/2 power divider.
Further, the microwave band receiver further comprises a second harmonic filter, and the second harmonic filter is connected with the input end of the 1-in-2 power divider.
Further, the first frequency synthesizer, the second frequency synthesizer and the third frequency synthesizer all adopt an integer-type or fractional-type phase-locked loop structure.
As shown in fig. 3, the integer or fractional phase-locked loop structure is used to provide the required local oscillation signal to the down-converter. The working principle is as follows: the phase detector compares the phases of the two signals and converts the output current of the charge pump into a voltage signal that controls the output frequency of the VCO through a loop filter. And the output frequency of the VCO returns to the phase detector through the frequency divider to be used as one signal of the phase detector. The other signal of the phase detector is a reference signal. The reference signal is mainly from a high stability crystal oscillator. A small integer divider with a division ratio is generally inserted between the crystal oscillator and the phase detector to adjust the reference frequency. After the output frequency of the VCO deviates, the phase difference can be generated between the signal output to the phase detector after frequency division and the reference signal, the phase detector can convert the phase difference into current, the current is converted into a voltage signal through the loop filter, and the output frequency of the VCO is pulled back, so that a complete real-time feedback system is formed.
Assuming that the reference frequency is 50MHz and the frequency division ratio of the reference frequency divider is 1, the frequency of the reference signal of the phase detector is 50 MHz. When the output frequency of a first frequency synthesizer of the Ku band receiver is 11.3GHz, the frequency divider dividing ratio of the frequency synthesizer is set to 11300/50-226; the output frequency of a first frequency synthesizer of the C-band receiver is 5.15GHz, and the frequency divider dividing ratio of the frequency synthesizer is set to be 5150/50-103; since the division ratios are all integers, so called integer division. The output frequency of the third frequency synthesizer is 760MHz, and the frequency divider division ratio of the frequency synthesizer is 760/50 ═ 15.2, which is called fractional division because the division ratio is fractional. The frequency synthesizer of the L-band down-conversion needs to select an output frequency according to a channel, and at this time, the output frequency of the frequency synthesizer can be controlled by setting a frequency dividing ratio of a frequency divider of the frequency synthesizer. To achieve finer frequency resolution, the division ratio may be an integer or a decimal number.
Further, the first power divider and the second power divider are both 1-to-12 power dividers.
In the embodiment, the radio frequency front end has reconfigurability of a system level and a module level. In the following, by taking Ku band (12.25 GHz-12.75 GHz) and C band (3.8 GHz-4.2 GHz) as examples, how to construct a set of Ku band or C band broadband receivers by reconstructing the radio frequency front end without changing the function of the radio frequency back end is explained in detail.
As shown in fig. 2a, the 12.25GHz to 12.75GHz signals are received by the antenna and then enter the low noise amplifier. The low noise amplifier includes an amplifier and a filter. The amplifier is selected from a gallium arsenide Schottky barrier gate field effect transistor (GaAs MESFET) or a high mobility transistor (HEMT) with small noise coefficient and large gain. The overall gain can be controlled within 25-35 dB. The output end of the low noise amplifier is connected with the radio frequency down converter. And mixing the 12.25 GHz-12.75 GHz signals with the 11.3GHz local oscillator through the radio frequency down converter, wherein the down conversion is 0.95-1.45 GHz L waveband signals. The L-band signal passes through a first harmonic filter (0.95-1.45 GHz) to filter out harmonic waves of the signal after down-conversion. In this signal processing path, the closest harmonic frequency to the useful signal is 2 × 0.95GHz to 1.9GHz, and is separated from the upper cutoff frequency 1.45GHz of the useful signal by 450 MHz. The frequency interval is large enough to ensure the realizability of the filter. Since the first harmonic filter functions only to filter out harmonics, it may be replaced by a low pass filter. The cut-off frequency of the low-pass filter may be 1.5 GHz. The image frequency of the useful signal at the antenna end is 9.85-10.35 GHz, and the image signal and the frequency of the 12.25-12.75 GHz signal are separated greatly, so that the useful signal can be easily filtered by a filter on a low-noise amplifier circuit.
As shown in fig. 2b, the 3.8GHz to 4.2GHz signals are received by the antenna and then enter the low noise amplifier. The low noise amplifier includes an amplifier and a filter. The overall gain of the amplifier can be controlled within 25-35 dB. The output end of the low noise amplifier is connected with the radio frequency down converter. And mixing the 3.8 GHz-4.2 GHz signals with a 5.15GHz local oscillator through the radio frequency down converter, wherein the down conversion is 0.95-1.35 GHz L waveband signals. And filtering the harmonic waves of the signals after down-conversion by the L-band signals through the first harmonic filter (0.95-1.35 GHz). In this signal processing path, the closest harmonic frequency to the useful signal is 2 × 0.95GHz to 1.9GHz, and is separated from the upper cutoff frequency 1.35GHz of the useful signal by 550 MHz. The frequency interval is large enough to ensure the realizability of the filter. Because the first harmonic filter (0.95-1.35 GHz) only functions to filter out harmonics, the first harmonic filter can be replaced by a low-pass filter. The cut-off frequency of the low-pass filter may be 1.4 GHz. The image frequency of useful signals at the antenna end is 6.1 GHz-6.5 GHz, and the image signals and the 3.8 GHz-4.2 GHz signals have larger frequency interval, so the useful signals can be easily filtered by a filter on a low noise amplifier circuit.
Therefore, no matter the signals of Ku wave band or C wave band are down-converted into L wave band signals, the signals can be processed by the frequency conversion unit uniformly; therefore, under the system framework, the receiving frequency band and the receiving bandwidth of the receiver can be reconstructed only by changing the radio frequency front end.
After the microwave broadband signal is down-converted to the L wave band, the left-handed signal and the right-handed signal are respectively divided into 12 paths of signals through a 1-to-12 power divider. Each channel is provided with a complete signal processing path from radio frequency to analog intermediate frequency; the connection relationship of each signal channel is as follows: radio frequency amplifier, numerical control attenuator, L wave band filter, L wave band down converter are according to preface series connection, the output of L wave band down converter is connected filtering and amplifying circuit, the process the signal that filtering and amplifying circuit enlargies passes through down conversion of intermediate frequency down converter is to 70MHz simulation intermediate frequency. And the analog intermediate frequency signal is filtered and amplified by an intermediate frequency filter, an AGC amplifier and an intermediate frequency filter. As shown in fig. 1, the signal transmission paths of the frequency conversion units are listed as follows:
1) the left-handed L wave band signal or the right-handed L wave band signal is subjected to signal amplification through a radio frequency amplifier with fixed gain, and then enters a numerical control attenuator (the numerical control attenuator can be provided with an attenuation value through an SPI (serial peripheral interface), so that the signal power entering an L wave band down converter can be flexibly adjusted), and the attenuated signal enters the L wave band filter again to filter out harmonic waves generated after the signal amplification. For Ku band (12.25GHz E ℃)
12.75GHz) and C-band (3.8 GHz-4.2 GHz), the L-band filter can be a 0.95-1.45 GHz filter or a 1.5GHz low-pass filter.
2) Amplified and attenuatedAnd the left-handed L-waveband signal or the right-handed L-waveband signal enters an L-waveband down converter. The role of the L-band downconverter is to downconvert the L-band signals to an intermediate frequency signal at 830 MHZ. The L-band down converter is connected with a first frequency synthesizer, and the output frequency of the first frequency synthesizer can be controlled through an SPI interface. Assume that the currently set channel frequency is fchannelIf the output frequency of the first frequency synthesizer is f1, the output frequency of the second frequency synthesizer is f 2:
f2＝|f1-fchannell +830 MHz; for example, the following steps are carried out: when f ischannel12.3GHz, f 1GHz, and the output frequency f2 of the second frequency synthesizer |12.3-11.3 GHz +830MHz | -1.83 GHz. When in use
fchannel4GHz, then:
the output frequency f2 of the second frequency synthesizer is 4-5.15 GHz +830MHz 1.98 GHz.
3) The left-handed L wave band signal and the right-handed L wave band signal are converted into 830MHz intermediate frequency signals after frequency conversion, and then pass through the acoustic meter filter (the center frequency is 830MHz, the bandwidth is 40 MHz)
After filtering, the original wideband signal is converted into a narrowband signal with a bandwidth of 40 MHz. The image signal is also filtered out by this filter.
4) The left-handed and right-handed 830MHz intermediate frequency narrow band signals are converted into 70MHz analog intermediate frequency signals through an intermediate frequency down converter. The output frequency of the third frequency synthesizer is fixed to 760 MHz.
5) The left-hand and right-hand analog intermediate frequency signals are filtered by a first intermediate frequency filter (70 +/-20 MHz) and then are sent to an AGC amplifier. The signal output amplitude of the AGC amplifier is controlled at 0 dBm.
6) The output signals of the left-hand AGC amplifier and the right-hand AGC amplifier are processed by a second intermediate frequency filter (70 +/-20 MHz)
After filtering, the analog intermediate frequency signal is output from an analog intermediate frequency output port.
In the receiver, one channel signal needs to undergo three times of frequency mixing, each time of frequency mixing needs to have one local oscillator signal, and the three local oscillator signals are respectively provided by three frequency synthesizers. Their connection to the mixer is as follows: the output end f1 of the first frequency synthesizer is connected to the radio frequency down converters in the front left-handed signal channel and the right-handed front left-handed signal channel respectively through a one-to-two power divider after the harmonic wave is filtered by the second harmonic filter. And an output end f2 of the second frequency synthesizer is respectively connected with the L-band down converters in the rear left-hand signal channel and the rear right-hand signal channel through a one-to-two power divider after harmonic waves are filtered by the second harmonic filter. And the output end f3 of the third frequency synthesizer is respectively connected with the intermediate frequency down-converters in the rear left-hand signal channel and the rear right-hand signal channel through a one-to-two power divider after harmonic waves are filtered by the second harmonic wave filter. Of the three frequency synthesizers, the first frequency synthesizer f1 and the third frequency synthesizer f3 output signals of fixed frequency (Ku band receiver, f1 is 11.3GHz, C band receiver, f1 is 5.15GHz, and f3 is 760 MHz); only the output frequency of the second frequency synthesizer is configurable, the configured interface adopts an SPI interface, the configured frequency range is 1.78-2.28 GHz of the Ku band receiver, and the C band is 1.78-2.18 GHz; in this example, the bandwidth of the Ku band receiver is 100MHz more than that of the C band receiver, and the frequency range of the second frequency synthesizer may be based on the Ku band receiver, so that the same frequency synthesizer can simultaneously meet the requirements of the Ku band receiver and the C band receiver. In addition, all reference frequencies of the frequency synthesizer of the present application are connected to the same reference source.
The first harmonic filter must ensure a bandwidth greater than the input signal bandwidth and suppress the image frequency interference of the input signal. Assuming that the frequency of the input signal is fin, the bandwidth is 2 × BWin, and the output frequency of the first frequency synthesizer is f1, the 3dB bandwidth of the first harmonic filter is greater than 2 × BWin, and the rejection of signals with frequencies of (2 × f1-fin) ± BWin is greater than 30 dB.
The L-band filter must ensure that the bandwidth is greater than the input signal bandwidth and can suppress image signals and intermediate frequency harmonics generated after frequency mixing; the method comprises the following specific steps:
1) image signal rejection: because the down-converted L-band down converter is a narrow-band signal, the bandwidth of the suppressed image signal is the same as the analog intermediate frequency bandwidth, namely 40 MHz. Rejection requirement >40dB, image frequency:
(f2+830MHz)±20MHz
2) the center frequency of the L-band filter is | fin-f1|, and the bandwidth is 2 × BWin. And is in function for frequency n
The signal of (| fin-f1| + -BWin) (n ═ 2,3,4) has an inhibitory effect of more than 20 dB. Based on this requirement, 2 × (| fin-f1| -BWin) is greater than | fin-f1| + BWin. The formula is as follows:
2 × (| fin-f1| -BWin) > | fin-f1| + BWin, simplified as:
|fin-f1|>2×BWin；
the frequency of the down-converted L-band signal must be greater than the bandwidth of the input signal and must be spaced at a frequency such that the L-band filter can achieve 20dB rejection.
The second frequency synthesizer is a variable frequency synthesizer, and the frequency variation range of the second frequency synthesizer is equal to the bandwidth of the input signal. The output frequency range of the second frequency synthesizer is as follows: (| fin-f1| +830MHz-BWin, | fin-f1| +830MHz + BWin), the bandwidth of the filter connected to the output of the second frequency synthesizer is larger than the input frequency bandwidth.
The gain adjusting range of the AGC amplifier is-2.5-42 dB, the detection mode is RMS detection, and the target power of the AGC amplifier is set to 0 dBm.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention can realize broadband signal input and output of a plurality of intermediate frequency signals, thereby receiving a plurality of channel signals in parallel, and the frequency of each channel can be independently matched. Compared with other receivers, the system can receive signals of only one communication satellite at a time, and the system can correspondingly set corresponding channel frequency according to the communication frequency of each satellite, so that one receiver can simultaneously receive signals of a plurality of communication satellites.
2. The invention uses the left-handed channel to receive the left-handed satellite signal and uses the right-handed channel to receive the right-handed satellite signal, thereby realizing the same frequency multiplexing of the signals. And all local oscillators of the left-handed channel and the right-handed channel are shared, so that the consistency of the phases of the left-handed signal and the right-handed signal is ensured.
3. All channels share the same radio frequency front end, and the broadband signals of the microwaves are uniformly converted into the L wave band through the radio frequency down converter, so that the complexity of system design is reduced, the mutual interference of a plurality of radio frequency front ends is avoided, and the power consumption is reduced for the operation of the system.
4. The radio frequency front end has system-level and module-level reconfigurability, and provides support for the existing microwave frequency band communication system to the maximum extent. And different communication systems can be built only by reconstructing the radio frequency front end according to requirements.
5. The receiver of the invention has strong robustness, which is mainly expressed as follows: the receiver has a plurality of receiving channels, and even if individual receiving channels fail, other channels can still work normally because each channel is independent of each other. Meanwhile, the receiver is provided with a numerical control attenuator and an AGC amplifier, can automatically adjust the integral gain of the channel under the condition of overlarge input signals, avoids signal loss caused by channel blockage, and has certain anti-interference capability.
The above embodiments are merely illustrative of the preferred embodiments of the present invention, and not restrictive, and various changes and modifications to the technical solutions of the present invention may be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are intended to fall within the scope of the present invention defined by the appended claims.

Claims (10)

1. An ultra-wideband single-input-multiple-output microwave band receiver, comprising: the microwave band signal down-conversion device comprises a left-handed antenna, a right-handed antenna, a radio frequency front end, a first power divider, a second power divider and a plurality of frequency conversion units, wherein the radio frequency front end is used for down-converting a microwave band signal to an L band signal, and the frequency conversion units are used for converting the L band signal to an intermediate frequency signal;
the radio frequency front end comprises a front left-handed signal channel and a front right-handed signal channel, the input end of the front left-handed signal channel is connected with the left-handed antenna, the output end of the front left-handed signal channel is connected with the first power divider, the input end of the front right-handed signal channel is connected with the right-handed antenna, and the output end of the front right-handed signal channel is connected with the second power divider;
the frequency conversion unit comprises a rear left-handed signal channel and a rear right-handed signal channel, the input end of the rear left-handed signal channel is connected with the output end of the first power divider, and the input end of the rear right-handed signal channel is connected with the output end of the second power divider;
the front left-handed signal channel and the front right-handed signal channel are connected with a first frequency synthesizer together, and the rear left-handed signal channel and the rear right-handed signal channel are connected with a second frequency synthesizer and a third frequency synthesizer together.
2. The ultra-wideband single-in-multiple-out microwave band receiver according to claim 1, wherein the front-left-handed signal path comprises: the low-noise amplifier is connected with the 3dB attenuator through the radio frequency down converter, the first harmonic filter and the amplifier in sequence, and the output end of the first frequency synthesizer is connected with the input end of the radio frequency down converter.
3. The ultra-wideband single-in-multiple-out microwave band receiver according to claim 2, wherein the front right-turn signal path has the same structure as the front left-turn signal path.
4. The ultra-wideband single-in multiple-out microwave band receiver of claim 1, wherein the rear left-handed signal path comprises: the radio frequency amplifier is connected with the second intermediate frequency filter sequentially through the numerical control attenuator, the L waveband filter, the L waveband down converter, the filtering amplifying circuit, the intermediate frequency down converter, the first intermediate frequency filter, the AGC amplifier and the second intermediate frequency filter;
the input end of the L-band down converter is connected with the output end of the second frequency synthesizer, and the input end of the intermediate frequency down converter is connected with the output end of the third frequency synthesizer.
5. The UWB single-in multiple-out microwave band receiver of claim 4 wherein the structure of the back right-turn signal path is the same as the structure of the back left-turn signal path.
6. The UWB single-in multiple-out microwave band receiver of claim 4 wherein the filter amplifying circuit comprises an amplifier and two SAW filters, wherein the two SAW filters are respectively connected to an input end and an output end of the amplifier.
7. The ultra-wideband single-in multiple-out microwave band receiver according to any of claims 1-6, further comprising a 1-in-2 power divider, wherein the first frequency synthesizer is connected to the radio frequency down-converter through the 1-in-2 power divider, the second frequency synthesizer is connected to the L-band down-converter through the 1-in-2 power divider, and the third frequency synthesizer is connected to the intermediate frequency down-converter through the 1-in-2 power divider.
8. The ultra-wideband single-in-multiple-out microwave band receiver of claim 7, further comprising a second harmonic filter coupled to an input of the 1-in-2 power divider.
9. The ultra-wideband single-input-multiple-output microwave band receiver of claim 7, wherein the first frequency synthesizer, the second frequency synthesizer and the third frequency synthesizer are all integer or fractional phase-locked loop structures.
10. The uwb single-in multiple-out microwave band receiver of claim 1, wherein the first power divider and the second power divider are both 1-in-12 power dividers.
CN202210038553.0A 2022-01-13 2022-01-13 Ultra-wideband single-input multi-output microwave band receiver Pending CN114584157A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210038553.0A CN114584157A (en) 2022-01-13 2022-01-13 Ultra-wideband single-input multi-output microwave band receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210038553.0A CN114584157A (en) 2022-01-13 2022-01-13 Ultra-wideband single-input multi-output microwave band receiver

Publications (1)

Publication Number Publication Date
CN114584157A true CN114584157A (en) 2022-06-03

Family

ID=81770923

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210038553.0A Pending CN114584157A (en) 2022-01-13 2022-01-13 Ultra-wideband single-input multi-output microwave band receiver

Country Status (1)

Country Link
CN (1) CN114584157A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115911893A (en) * 2022-10-27 2023-04-04 中国科学院国家天文台 Radio astronomy normal-temperature L-waveband dual-polarization receiver

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115911893A (en) * 2022-10-27 2023-04-04 中国科学院国家天文台 Radio astronomy normal-temperature L-waveband dual-polarization receiver
CN115911893B (en) * 2022-10-27 2023-08-08 中国科学院国家天文台 Radio astronomical normal temperature L wave band dual polarization receiver

Similar Documents

Publication Publication Date Title
CN102904529B (en) Frequency down-converter
CN113630194A (en) X-band high-isolation radio frequency transceiving system and channel consistency calibration method thereof
CN113225021B (en) Ultra-wideband constant-temperature down converter
KR20030044830A (en) Tuner arrangement and set top box
CN214591434U (en) Receiving and transmitting frequency conversion device based on high isolation
CN112787684A (en) Front-end module for 5G millimeter wave and 5G millimeter wave communication system
CN114584157A (en) Ultra-wideband single-input multi-output microwave band receiver
CN114785358A (en) Miniaturized L-to-C waveband multi-channel self-adaptive frequency converter
CN108400785A (en) A kind of miniaturization microwave broadband victory frequency Up/Down Conversion system and calibration method
CN109257057B (en) Ultra-wideband superheterodyne receiving system
JP3996902B2 (en) Microwave band radio receiver and microwave band radio communication system
US6628960B1 (en) Multi-mode radio receiver
CN114244281B (en) Satellite-borne Ka frequency band broadband multi-channel down-conversion system
CN218217346U (en) Radio frequency receiving module for satellite signal acquisition
DE19916574C1 (en) Frequency processing system for a mobile radio dual band transmitter / receiver (transceiver)
WO2023166385A1 (en) Self mixing frequency doubler tripler circuits for wireless communication
WO2023144618A1 (en) Inphase quadrature current selector amplifiers for wireless communication
CN214707702U (en) Satellite beacon receiver
GB2332109A (en) A tunable voltage controlled bandpass filter for a direct conversion receiver
KR102152131B1 (en) Millimeter wave down converter module with multiple channels of the ka band
CN114039642A (en) High-speed Ka frequency range repeater system with large bandwidth and adjustable frequency
EP1049246A1 (en) Transceiver with a mixer having selectable image frequency
CN220511083U (en) 2-18GHz broadband down-conversion assembly
Treuttel et al. A Novel 300–520 GHz TripIer with 50% Bandwidth for Multi-pixel Heterodyne SIS Array Local Oscillator Signal Generation
CN213906671U (en) Front-end module for 5G millimeter wave and 5G millimeter wave communication system

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination