CN214851230U - Multichannel satellite communication receiver - Google Patents
Multichannel satellite communication receiver Download PDFInfo
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- CN214851230U CN214851230U CN202120311518.2U CN202120311518U CN214851230U CN 214851230 U CN214851230 U CN 214851230U CN 202120311518 U CN202120311518 U CN 202120311518U CN 214851230 U CN214851230 U CN 214851230U
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Abstract
The utility model discloses a satellite communication receiver of multichannel can solve the problem that a frequency synthesizer frequency hopping time comes too late, guarantees uninterrupted communication, promotes the interference killing feature simultaneously. The satellite communication receiver comprises an antenna, a dielectric filter, a radio frequency amplifier, a power divider, 4 paths of mixing channels and a baseband processing configuration chip. Wherein the signal output end of the antenna is connected with the input end of the dielectric filter; the output end of the dielectric filter is connected with the input end of the radio frequency amplifier, and the output end of the radio frequency amplifier is connected with the power divider; the power divider is a 4-path power divider, and the output end of the power divider comprises 4 output ports which are respectively connected with 4-path frequency mixing channels; the end outputs of the 4 mixing channels are connected to a baseband processing configuration chip. The structures of the 4 channels of mixing channels are the same, each mixing channel is provided with an independent frequency synthesizer, one mixing channel is positioned at the working frequency point of the current wave beam, and the other three mixing channels are arranged as the frequency points corresponding to the three wave beams in the advancing direction in advance.
Description
Technical Field
The utility model relates to the field of communication technology, concretely relates to satellite communication receiver of multichannel.
Background
Satellite signals received by a traditional satellite receiver antenna directly enter a low noise amplifier, amplified signals are input to a frequency mixer after being processed by a band-pass filter, the frequency mixer is connected with a frequency synthesizer, the frequency synthesizer is provided with a fixed frequency point or an unfixed frequency point, the frequency mixer carries out frequency conversion according to radio frequency signals corresponding to the frequency point processing of the frequency synthesizer, the signals after frequency conversion pass through an intermediate frequency filter with a fixed bandwidth, the signals after being processed by the frequency filter are amplified by the intermediate frequency amplifier and then sent to an ADC for sampling, and then the signals are sent to a baseband processing unit for processing, so that the capturing, tracking and demodulation of the satellite signals are completed.
In the application of the satellite communication, the problem of cross-wave speed switching exists in the high dynamic flying process, so that the communication frequency points are frequently switched, and a conventional receiver adopts a frequency synthesizer, so that the frequency hopping time is long, and the reliability and the uninterrupted communication cannot be ensured.
There are also multi-channel receivers, but four local oscillators share one frequency synthesizer, and four channels cannot independently cover beams of different frequency points, and also cannot guarantee uninterrupted communication. Meanwhile, in the aspect of intentional interference, the intermediate frequency is fixed in bandwidth, and the anti-interference performance of the intermediate frequency is limited. The sampling rate of the single-frequency conversion architecture is limited, and the baseband processing difficulty is improved.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a satellite communication receiver of multichannel can be increased to four ways mixing channel by mixing channel all the way, and every mixing channel all sets up independent frequency synthesizer, increases the system redundancy, solves a frequency synthesizer frequency hopping time and comes untimely problem, guarantees uninterrupted communication, sets up two kinds of bandwidth filter simultaneously, promotes the interference killing feature.
In order to achieve the above purpose, the technical scheme of the utility model is that: a multi-channel satellite communication receiver comprises an antenna, a dielectric filter, a radio frequency amplifier, a power divider, 4-channel mixing channels and a baseband processing configuration chip.
The connection relationship is that the signal output end of the antenna is connected with the input end of the dielectric filter; the output end of the dielectric filter is connected with the input end of the radio frequency amplifier, and the output end of the radio frequency amplifier is connected with the power divider; the power divider is a 4-path power divider, and the output end of the power divider comprises 4 output ports which are respectively connected with 4-path frequency mixing channels; the end outputs of the 4 mixing channels are connected to a baseband processing configuration chip.
The structures of the 4 mixing channels are the same, and the 4 mixing channels all comprise: the device comprises a first acoustic meter filter, a mixer, a frequency synthesizer, an LTCC filter, a first intermediate frequency amplifier, a first single-pole double-throw switch, a second acoustic meter filter, a third acoustic meter filter, a second single-pole double-throw switch, a second intermediate frequency amplifier and an analog-to-digital converter AD 9261.
The first acoustic surface filter, the mixer, the LTCC filter and the first intermediate frequency amplifier are connected in sequence; the frequency synthesizer is connected with the mixer and is used for providing frequency signals for mixing for the mixer, wherein the frequency signals provided by the frequency synthesizers on different mixing channels are different; the output end of the first intermediate frequency amplifier is connected to the movable end of the first single-pole double-throw switch, and two immovable ends of the first single-pole double-throw switch are respectively connected with the second sound meter filter and the third sound meter filter; two fixed ends of the second single-pole double-throw switch are respectively connected with the second acoustic surface filter and the third acoustic surface filter, and the movable end of the second single-pole double-throw switch is connected to the input end of the second intermediate frequency amplifier; the output end of the second intermediate frequency amplifier is connected with the analog-to-digital converter AD9261 as the tail end output of the mixing channel.
The baseband processing configuration chip is respectively connected with the control end of the frequency synthesizer, the control end of the first single-pole double-throw switch and the control end of the second single-pole double-throw switch, and outputs control signals which are respectively sent to the control end of the frequency synthesizer, the control end of the first single-pole double-throw switch and the control end of the second single-pole double-throw switch.
Further, the antenna is used for receiving the S-band satellite signal; the insertion loss of the dielectric filter is less than or equal to 1dB, and the out-of-band rejection is more than 30 dBc; selecting a low-noise amplifier with the gain of 35-40 dB and the noise coefficient less than or equal to 1dB by the radio-frequency amplifier; the power divider selects a 4-path power divider with insertion loss of 8dB and isolation of 20 dBc.
Furthermore, the center frequency of the first acoustic surface filter is +/-30 MHz, and the out-of-band rejection is more than 40 dBc; the frequency synthesizer adopts BW 726; the mixer selects BW 350.
Furthermore, the second acoustic table filter selects an acoustic table filter with a bandwidth of 0.5M, and the third acoustic table filter selects an acoustic table filter with a bandwidth of 5MHz and a despreading gain of more than 10 dB.
Further, the AD9261 is a zero intermediate frequency architecture, and the sampling rate is above 300 MHz.
Further, the frequency signals provided by the frequency synthesizers on different mixing channels are different, specifically: setting a frequency signal of a frequency synthesizer on one of the frequency mixing channels as a current wave beam working frequency point; and setting frequency signals of the frequency synthesizers on the other three frequency mixing channels as frequency points corresponding to the three beams in the advancing direction of the current beam.
Has the advantages that:
the utility model provides a multichannel satellite communication receiver, which is increased to four mixing channels from one mixing channel, one mixing channel is at the current working frequency point of wave beam, the other three mixing channels are set in advance as the frequency points corresponding to three wave beams in the advancing direction, the system redundancy is increased, and the problem that the frequency hopping time of a frequency synthesizer is too late is solved; the intermediate frequency channel is added with two types of sound meter filters with the bandwidth, under the condition of no interference, the communication with the bandwidth of 0.5MHz is carried out, and when the communication is in strong interference, the communication is switched to a channel with the bandwidth of 5MHz, so that the anti-interference capability is improved by more than or equal to 10 dB. The intermediate frequency signal is filtered, amplified and input to the AD9261, secondary zero intermediate frequency conversion is carried out, and flexible sampling rate is provided for digital signal processing.
The utility model discloses a superheterodyne and zero intermediate frequency conversion structure, the first frequency conversion adopts superheterodyne to receive, and the mixing is to intermediate frequency 140MHz, uses the out-of-band rejection of sound table filter filtering, provides better 40dBc-80dBc out-of-band rejection beyond the out-of-band 5MHz, and the second secondary frequency conversion adopts zero intermediate frequency framework AD9261, can provide nimble sampling frequency, more is suitable for the high dynamic satellite communication under the complicated electromagnetic environment.
Drawings
Fig. 1 is a schematic diagram of a multi-channel satellite communication receiver according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings by way of examples.
The utility model provides a multi-channel satellite communication receiver, the detailed block diagram is shown in figure 1, comprising an antenna, a dielectric filter, a radio frequency amplifier, a power divider, 4-channel mixing channels and a baseband processing configuration chip;
the connection relationship is that the signal output end of the antenna is connected with the input end of the dielectric filter; the output end of the dielectric filter is connected with the input end of the radio frequency amplifier, and the output end of the radio frequency amplifier is connected with the power divider; the power divider is a 4-path power divider, and the output end of the power divider comprises 4 output ports which are respectively connected with 4-path frequency mixing channels; the end outputs of the 4 mixing channels are connected to a baseband processing configuration chip.
The structures of the 4 mixing channels are the same, and the 4 mixing channels all comprise: the device comprises a first acoustic meter filter, a mixer, a frequency synthesizer, an LTCC filter, a first intermediate frequency amplifier, a first single-pole double-throw switch, a second acoustic meter filter, a third acoustic meter filter, a second single-pole double-throw switch, a second intermediate frequency amplifier and an analog-to-digital converter AD 9261.
The first acoustic surface filter, the mixer, the LTCC filter and the first intermediate frequency amplifier are connected in sequence; the frequency synthesizer is connected with the mixer and is used for providing frequency signals for mixing for the mixer, wherein the frequency signals provided by the frequency synthesizers on different mixing channels are different; the output end of the first intermediate frequency amplifier is connected to the movable end of the first single-pole double-throw switch, and two immovable ends of the first single-pole double-throw switch are respectively connected with the second sound meter filter and the third sound meter filter; two fixed ends of the second single-pole double-throw switch are respectively connected with the second acoustic surface filter and the third acoustic surface filter, and the movable end of the second single-pole double-throw switch is connected to the input end of the second intermediate frequency amplifier; the output end of the second intermediate frequency amplifier is connected with the analog-to-digital converter AD9261 as the tail end output of the mixing channel.
The baseband processing configuration chip is respectively connected with the control end of the frequency synthesizer, the control end of the first single-pole double-throw switch and the control end of the second single-pole double-throw switch, and outputs control signals which are respectively sent to the control end of the frequency synthesizer, the control end of the first single-pole double-throw switch and the control end of the second single-pole double-throw switch.
In the embodiment of the utility model, the S wave band satellite signal that the antenna received, through the insertion loss less than or equal to 1dB, the medium filter of more than 30dBc is restrained out of band, filters out the out-of-band interference signal, provides the survivability of receiver under complicated electromagnetic environment; the signals processed by the filter are amplified and output by a low noise amplifier with the noise coefficient less than or equal to 1dB through 35-40 dB gain; the output signal passes through a 4-path power divider with insertion loss of 8dB and isolation of 20 dBc; the branches of each output of the power divider are the same.
In the embodiment of the utility model, the sound meter filter behind the power divider needs to suppress the crosstalk of the output signal of the four-way BW726 frequency synthesizer, improve the channel isolation, and suppress the received image interference, so that the suppression of the center frequency of the sound meter filter beyond ± 30MHz needs more than 40 dBc;
in the embodiment of the utility model, the frequency synthesizer adopts BW726, which can realize the step change of 10KHz and meet the wave speed switching requirement; the four-way BW726 works at frequencies corresponding to four wave velocities, one channel works at a frequency point corresponding to the current wave velocity, and the other three works at a frequency point of the wave velocity in the forward direction.
The embodiment of the utility model provides an in, the mixer uses BW350, and BW726 is synthesized frequency conversion frequently to fixed intermediate frequency 140MHz, and output signal provides 40dBc and suppresses BW726 and synthesizes output signal frequently, improves intermediate frequency spectrum's purity through LTCC low pass filter. The LTCC output signal is subjected to gain improvement through the intermediate frequency amplifier.
In the embodiment of the utility model, the intermediate frequency channel uses the acoustic meter filter with two bandwidths, the baseband processing configuration chip selects different acoustic meter filters by controlling the first single-pole double-throw switch and the second single-pole double-throw switch, and when the signal-to-interference ratio is better than-10 dB, the acoustic meter filter with 0.5M bandwidth is selected; when the signal-to-interference ratio is lower than-10 dB, the bandwidth is switched to 5MHz, the despreading gain is improved by more than 10dB, and the anti-interference performance is enhanced. The signal output by the filter is amplified by an amplifier and is supplied to the AD 9261;
the AD9261 is a zero intermediate frequency architecture, and can provide a flexible high sampling rate above 300 MHz;
in the embodiment of the utility model, the superheterodyne receiver and the zero intermediate frequency receiving combination are adopted for realization, the front-end superheterodyne receiver compensates the zero intermediate frequency and has weak anti-jamming capability, the zero intermediate frequency architecture compensates the superheterodyne structure flexibility, and the radio capability of the satellite receiving software of the heaven-earth satellite can be realized;
in summary, the above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A multi-channel satellite communication receiver is characterized by comprising an antenna, a dielectric filter, a radio frequency amplifier, a power divider, 4 channels of mixing channels and a baseband processing configuration chip;
the connection relationship is that the signal output end of the antenna is connected with the input end of the dielectric filter; the output end of the dielectric filter is connected with the input end of the radio frequency amplifier, and the output end of the radio frequency amplifier is connected with the power divider; the power divider is a 4-path power divider, and the output end of the power divider comprises 4 output ports which are respectively connected with 4 paths of frequency mixing channels; the tail end output of the 4 paths of mixing channels is connected to the baseband processing configuration chip;
the structures of the 4 mixing channels are the same, and the 4 mixing channels all comprise: the device comprises a first acoustic meter filter, a mixer, a frequency synthesizer, an LTCC filter, a first intermediate frequency amplifier, a first single-pole double-throw switch, a second acoustic meter filter, a third acoustic meter filter, a second single-pole double-throw switch, a second intermediate frequency amplifier and an analog-to-digital converter AD 9261;
the first acoustic surface filter, the mixer, the LTCC filter and the first intermediate frequency amplifier are connected in sequence; the frequency synthesizer is connected with the frequency mixer and is used for providing frequency signals for frequency mixing for the frequency mixer, wherein the frequency signals provided by the frequency synthesizers on different frequency mixing channels are different; the output end of the first intermediate frequency amplifier is connected to the movable end of the first single-pole double-throw switch, and two fixed ends of the first single-pole double-throw switch are respectively connected with the second sound meter filter and the third sound meter filter; two fixed ends of a second single-pole double-throw switch are respectively connected with the second acoustic surface filter and the third acoustic surface filter, and a movable end of the second single-pole double-throw switch is connected to the input end of the second intermediate frequency amplifier; the output end of the second intermediate frequency amplifier is connected with the analog-to-digital converter AD9261 and is used as the tail end output of the mixing channel;
the baseband processing configuration chip is respectively connected with the control end of the frequency synthesizer, the control end of the first single-pole double-throw switch and the control end of the second single-pole double-throw switch, and the baseband processing configuration chip outputs control signals which are respectively sent to the control end of the frequency synthesizer, the control end of the first single-pole double-throw switch and the control end of the second single-pole double-throw switch.
2. The receiver of claim 1, wherein the antenna is configured to receive S-band satellite signals; the insertion loss of the dielectric filter is less than or equal to 1dB, and the out-of-band rejection is more than 30 dBc; the radio frequency amplifier selects a low noise amplifier with the gain of 35-40 dB and the noise coefficient less than or equal to 1 dB; the power divider selects a 4-path power divider with insertion loss of 8dB and isolation of 20 dBc.
3. The receiver of claim 1 or 2, wherein the first acoustic surface filter has a center frequency of ± 30MHz and an out-of-band rejection above 40 dBc;
the frequency synthesizer adopts BW 726; the mixer selects BW 350.
4. The receiver of claim 3, wherein the second saw filter selects a saw filter with a bandwidth of 0.5M, and the third saw filter selects a saw filter with a bandwidth of 5MHz and a despreading gain of 10dB or more.
5. The receiver of claim 4, wherein the AD9261 is a zero intermediate frequency architecture with a sampling rate above 300 MHz.
6. The receiver according to any of claims 1, 2, 4 or 5, wherein the frequency synthesizers on the different mixing channels provide different frequency signals, in particular:
setting a frequency signal of a frequency synthesizer on one of the frequency mixing channels as a current wave beam working frequency point;
and setting frequency signals of the frequency synthesizers on the other three frequency mixing channels as frequency points corresponding to the three beams in the advancing direction of the current beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120311518.2U CN214851230U (en) | 2021-02-03 | 2021-02-03 | Multichannel satellite communication receiver |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120311518.2U CN214851230U (en) | 2021-02-03 | 2021-02-03 | Multichannel satellite communication receiver |
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| CN214851230U true CN214851230U (en) | 2021-11-23 |
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| CN202120311518.2U Active CN214851230U (en) | 2021-02-03 | 2021-02-03 | Multichannel satellite communication receiver |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114552157A (en) * | 2022-01-28 | 2022-05-27 | 北京航天科工世纪卫星科技有限公司 | Power divider of small-size microstrip of L wave band |
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2021
- 2021-02-03 CN CN202120311518.2U patent/CN214851230U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114552157A (en) * | 2022-01-28 | 2022-05-27 | 北京航天科工世纪卫星科技有限公司 | Power divider of small-size microstrip of L wave band |
| CN114552157B (en) * | 2022-01-28 | 2024-03-08 | 北京航天科工世纪卫星科技有限公司 | L-band small microstrip power distributor |
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