CN112468221B - Radio frequency channel for microsatellite measurement and transmission all-in-one machine and measurement and transmission all-in-one machine - Google Patents
Radio frequency channel for microsatellite measurement and transmission all-in-one machine and measurement and transmission all-in-one machine Download PDFInfo
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- CN112468221B CN112468221B CN202011338399.6A CN202011338399A CN112468221B CN 112468221 B CN112468221 B CN 112468221B CN 202011338399 A CN202011338399 A CN 202011338399A CN 112468221 B CN112468221 B CN 112468221B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
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- H04B7/18515—Transmission equipment in satellites or space-based relays
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Abstract
The invention relates to a radio frequency channel for a microsatellite measurement and transmission all-in-one machine and a measurement and transmission all-in-one machine, wherein the radio frequency channel comprises: the receiving channel comprises a combiner, a low-noise amplifying unit, a frequency conversion and gain control unit and a receiving amplifying unit, the transmitting channel comprises a signal receiving unit, a high-speed radio frequency modulator and a power amplifying unit, the combiner, the low-noise amplifying unit, the frequency conversion and gain control unit and the receiving amplifying unit are electrically connected in sequence, and the signal receiving unit, the high-speed radio frequency modulator and the power amplifying unit are electrically connected in sequence. The invention provides a radio frequency channel for a microsatellite measurement and transmission integrated machine and the measurement and transmission integrated machine.
Description
Technical Field
The invention relates to the technical field of satellite measurement and control, in particular to a radio frequency channel for a microsatellite measurement and transmission all-in-one machine and a measurement and transmission all-in-one machine.
Background
Satellites weighing less than 1000 kilograms are collectively referred to as microsatellites. Microsatellites are a new generation of satellites with clear utility. The microsatellite has the characteristics of light weight, small volume, low cost and the like, has the advantages of short emission period and higher flexibility, is widely applied to the fields of communication, remote sensing, scientific and technical tests, military and the like, and develops towards the direction of miniaturization, low power consumption, generalization, constellation networking and formation flight in the future.
The satellite measurement and control system and the data transmission system are two important systems of the satellite. The measurement and control system is used for tracking, measuring, monitoring and controlling the orbit, the attitude and the state of the satellite. The data transmission system is used for transmitting image data, communication data and the like to the ground by a satellite.
At present, most of domestic measurement and control and transmission systems are independent systems. The traditional measurement and control answering machine mainly adopts a measurement and control system, and has a data transmission function, but the data transmission rate is lower and is generally lower than 3 Mbps. The data transmission transmitter only has a data transmission function and does not have a measurement and control function. With the rapid development of the aerospace technology, satellite tasks are increasingly diversified, and the data volume generated by the microsatellite flight tasks is larger and larger. Therefore, the microsatellite has higher and higher requirements on the measurement and control service function of the measurement and control system and the high-speed data transmission function of the application system, and the measurement and control system and the application system which are independent from each other have the problems of complex management, resource waste, difficult interaction among different systems and the like, and cannot meet the requirements of the current microsatellite on measurement and control and high-speed data transmission. And the requirement of the microsatellite on small volume and light weight requires a measurement and control data transmission integration technology, the measurement and control system and the data transmission system are shared, and the measurement and control function and the data transmission function can be realized on the same channel.
The channel for measuring and controlling data transmission is provided by the radio frequency board card and consists of a receiving channel and a transmitting channel. However, the current radio frequency channel has poor integration level and low data transmission rate, and is not suitable for the high-speed data transmission requirement of the microsatellite.
Therefore, in order to solve the above problems, it is desirable to provide a radio frequency channel for a microsatellite measurement and transmission all-in-one machine and a measurement and transmission all-in-one machine.
Disclosure of Invention
The invention aims to provide a radio frequency channel for a microsatellite measurement and transmission all-in-one machine and the measurement and transmission all-in-one machine, which adopt a standard board card structure, are suitable for a miniaturized use scene of an X-frequency band satellite measurement and control data transmission system, improve the bandwidth of a radio frequency transmission channel through the matching of a high-speed radio frequency modulator and a power amplification unit, improve the transmission power, can meet the requirement of higher data transmission rate, and simultaneously improve the radio frequency integration level and reduce the volume and the weight of the radio frequency channel through the optimized design of a combiner.
In order to achieve the purpose, the invention provides the following scheme:
a radio frequency channel for a microsatellite measurement and transmission all-in-one machine, comprising: the receiving channel comprises a combiner, a low noise amplifying unit, a frequency conversion and gain control unit and a receiving amplifying unit, the transmitting channel comprises a signal receiving unit, a high-speed radio frequency modulator and a power amplifying unit, the combiner, the low noise amplifying unit, the frequency conversion and gain control unit and the receiving amplifying unit are electrically connected in sequence, and the signal receiving unit, the high-speed radio frequency modulator and the power amplifying unit are electrically connected in sequence.
Optionally, the signal receiving unit includes a low voltage differential signal receiver and a low voltage differential signal driver, the low voltage differential signal receiver is configured to receive a low voltage differential signal transmitted by a baseband, an input end of the low voltage differential signal driver is electrically connected to an output end of the low voltage differential signal receiver, and an output end of the low voltage differential signal receiver is electrically connected to an input end of the high-speed radio frequency modulator.
Optionally, the transmission path still includes the band-pass filtering unit, the band-pass filtering unit includes first transmission band-pass filter and second transmission band-pass filter, the power amplification unit includes first transmission amplifier and second transmission amplifier, the output of high-speed radio frequency modulator with first transmission band-pass filter's input electricity is connected, first transmission band-pass filter's output with first transmission amplifier's input electricity is connected, first transmission amplifier's output with second transmission band-pass filter's input electricity is connected, second transmission band-pass filter's output with second transmission amplifier's input electricity is connected, second transmission amplifier's output passes through isolator output transmission radio frequency signal.
Optionally, the frequency conversion and gain control unit includes a gain control unit and a mixer, the receiving channel further includes a filter assembly, the filter assembly includes a first band pass filter, a first low pass filter and a second band pass filter, the receiving amplifying unit at least includes a first receiving amplifier, the gain control unit includes a frequency conversion gain controller, a coupler, a detector and an integrator, the frequency conversion gain controller is electrically connected to the input end of the coupler through the second band pass filter and the first receiving amplifier, the coupler is at least provided with a first output end, the first output end of the coupler is electrically connected to the input end of the detector, the output end of the detector is electrically connected to the input end of the integrator, the output end of the integrator is electrically connected to the frequency conversion gain controller, the input end of the mixer is electrically connected with the low-noise amplification unit, and the output end of the mixer is electrically connected with the input end of the variable-frequency gain controller through the first low-pass filter and the first band-pass filter.
Optionally, the receiving channel further includes a temperature compensation attenuator, the coupler is further provided with a second output end, the second output end of the coupler is electrically connected to the input end of the temperature compensation attenuator, the filter assembly further includes a second low-pass filter, the receiving and amplifying unit further includes a second receiving amplifier and a third receiving amplifier, the output end of the temperature compensation attenuator sequentially passes through the second receiving amplifier, the third receiving amplifier and the second low-pass filter to output an intermediate frequency signal, and the intermediate frequency signal is used for being provided to a baseband for use.
Optionally, the clock circuit includes a crystal oscillator, a power divider, a first local oscillator, a second local oscillator, and a third local oscillator, where the crystal oscillator is electrically connected to an input end of the power divider, three output ends of the power divider are electrically connected to the first local oscillator, the second local oscillator, and the third local oscillator, respectively, an output end of the first local oscillator is electrically connected to the mixer, an output end of the second local oscillator is electrically connected to the variable frequency gain controller, and an output end of the third local oscillator is electrically connected to the high-speed radio frequency modulator.
Optionally, the low-noise amplification unit includes a first low-noise amplifier and a second low-noise amplifier, the combiner has two input ends, the two input ends of the combiner are used for accessing a radio frequency signal, and the output end of the combiner is electrically connected to the frequency conversion and gain control unit sequentially through the first low-noise amplifier and the second low-noise amplifier.
Optionally, the low-noise amplification unit includes a first low-noise amplifier, a second low-noise amplifier, and a third low-noise amplifier, an input end of the first low-noise amplifier and an input end of the second low-noise amplifier are respectively used for accessing a radio frequency signal, an output end of the first low-noise amplifier and an output end of the second low-noise amplifier are both electrically connected to an input end of the combiner, and an output end of the combiner is electrically connected to the frequency conversion and gain control unit through the third low-noise amplifier.
Optionally, the first transmit amplifier and the second transmit amplifier both use gallium nitride power amplifiers, and/or the combiner is a radio frequency MMIC integrated combiner.
On the other hand, the application also provides a microsatellite testing and transmitting all-in-one machine, which comprises the radio frequency channel for the microsatellite testing and transmitting all-in-one machine, wherein the radio frequency channel is used for receiving and transmitting radio frequency signals.
According to the specific embodiment provided by the invention, the invention has the following technical effects:
1) the radio frequency channel and the measurement and transmission integrated machine for the microsatellite measurement and transmission integrated machine adopt the standard board card structure, are suitable for the miniaturized use scene of an X-frequency band satellite measurement and control data transmission system, improve the bandwidth of a radio frequency transmission channel and the transmission power through the matching of a high-speed radio frequency modulator and a power amplification unit, and can meet the requirement of higher data transmission rate;
2) in the invention, a signal receiving unit adopts a low-voltage differential signal high-speed interface, and simultaneously, through a high-speed radio frequency modulator, broadband amplification, broadband filtering and a high-speed device, the transmission bandwidth is more than 300 MHz;
3) the invention adopts the gallium nitride power amplifier device for amplifying the radio frequency power, has higher efficiency and output power compared with the traditional gallium arsenide power device, and has better heat dissipation performance, and the transmitting power can be more than 2 w;
4) in the invention, the radio frequency MMIC combiner is adopted, so that the radio frequency MMIC combiner is light in weight and small in size, and the combiner is easy to integrate on a radio frequency board card, thereby improving the radio frequency integration level and reducing the size and weight of a radio frequency channel.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the embodiment or the description of the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art it is also possible to derive other drawings from these drawings without inventive effort.
Fig. 1 is a structural block diagram of a radio frequency channel for a microsatellite measurement and transmission all-in-one machine provided by the invention.
FIG. 2 is a schematic diagram of the RF channel for the microsatellite transmission and measurement all-in-one machine provided by the invention.
Fig. 3 is a schematic diagram of a radio frequency channel for a microsatellite measurement and transmission all-in-one machine in embodiment 2 provided by the invention.
Fig. 4 is a layout diagram of a circuit printed board of a radio frequency channel of the microsatellite measurement and transmission all-in-one machine provided by the invention.
Wherein the reference numerals in the figures correspond to:
1-combiner, 2-low noise amplifier unit, 21-first low noise amplifier, 22-second low noise amplifier, 23-third low noise amplifier, 3-frequency conversion and gain control unit, 31-mixer, 32-gain control unit, 321-frequency conversion gain controller, 322-coupler, 323-detector, 324-integrator, 4-receiving amplifier unit, 41-first receiving amplifier, 42-second receiving amplifier, 43-third receiving amplifier, 5-clock circuit, 51-crystal oscillator, 52-power divider, 53-first local oscillator, 54-second local oscillator, 55-third local oscillator, 6-signal receiving unit, 61-low voltage differential signal receiver, 62-low voltage differential signal driver, 7-high speed radio frequency modulator, 8-power amplification unit, 81-first transmission amplifier, 82-second transmission amplifier, 9-filter component, 91-first low pass filter, 92-first band pass filter, 93-second band pass filter, 94-second low pass filter, 95-first transmission band pass filter, 96-second transmission band pass filter, 10-temperature compensation attenuator and 11-isolator.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention aims to provide a radio frequency channel for a microsatellite measurement and transmission all-in-one machine and the measurement and transmission all-in-one machine, which adopt a standard board card structure, are suitable for a miniaturized use scene of an X-frequency band satellite measurement and control data transmission system, improve the bandwidth of a radio frequency transmission channel through the matching of a high-speed radio frequency modulator and a power amplification unit, improve the transmission power, can meet the requirement of higher data transmission rate, and simultaneously improve the radio frequency integration level and reduce the volume and the weight of the radio frequency channel through the optimized design of a combiner.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example 1:
in this embodiment, referring to fig. 1, a radio frequency channel for a microsatellite measurement and transmission all-in-one machine includes a receiving channel, a transmitting channel and a clock circuit 5, the clock circuit 5 provides clock signals for the receiving channel and the transmitting channel, the receiving channel includes a combiner 1, a low noise amplification unit 2, a frequency conversion and gain control unit 3 and a receiving amplification unit 4, the transmitting channel includes a signal receiving unit 6, a high speed radio frequency modulator 7 and a power amplification unit 8, the combiner 1, the low noise amplification unit 2, the frequency conversion and gain control unit 3 and the receiving amplification unit 4 are electrically connected in sequence, and the signal receiving unit 6, the high speed radio frequency modulator 7 and the power amplification unit 8 are electrically connected in sequence. The invention completes the receiving, low noise amplification, frequency conversion and gain control of radio frequency signals through a combiner 1, a low noise amplification unit 2, a frequency conversion and gain control unit 3 and a receiving amplification unit 4, and finally outputs intermediate frequency signals; the modulation, filtering and amplification of data are completed through the signal receiving unit 6, the high-speed radio frequency modulator 7 and the power amplifying unit 8, and radio frequency signals are output. The high-speed radio frequency modulator modulates the signal received by the signal receiving unit 6 to a carrier wave through QPSK through the cooperation of the high-speed radio frequency modulator and the power amplifying unit, the bandwidth of the high-speed radio frequency modulator is larger than 6GHz, the bandwidth of a radio frequency transmitting channel is improved, the transmitting power is improved, and the requirement of higher data transmission rate can be met.
Further, referring to fig. 2, the signal receiving unit 6 includes a low voltage differential signal receiver 61 and a low voltage differential signal driver 62, the low voltage differential signal receiver 61 is configured to receive a low voltage differential signal transmitted by a baseband, an input terminal of the low voltage differential signal driver 62 is electrically connected to an output terminal of the low voltage differential signal receiver 61, and an output terminal of the low voltage differential signal receiver 61 is electrically connected to an input terminal of the high speed radio frequency modulator 7. The low-voltage differential signal receiver 61 performs level conversion on I, Q low-voltage differential signals sent by a baseband, converts the differential signals into single-ended signals, and ensures high-speed transmission of data, wherein the bandwidth of the low-voltage differential signal receiver is greater than 150 MHz. The low-voltage differential driver comprises an I driver and a Q driver, and carries out level conversion and driving on I, Q low-voltage differential signals sent by the baseband respectively, and the requirements of modulated signals are met. The driving adopts high-speed operational amplifier, and the bandwidth of the operational amplifier is more than 150 MHz. In this embodiment, the frequency of the received radio frequency signal is 7240MHz, and may also be other satellite X-band receiving frequencies.
Further, the transmission channel further includes a band-pass filtering unit, the band-pass filtering unit includes a first transmission band-pass filter 95 and a second transmission band-pass filter 96, the power amplifying unit 8 includes a first transmission amplifier 81 and a second transmission amplifier 82, an output end of the high-speed radio frequency modulator 7 is electrically connected to an input end of the first transmission band-pass filter 95, an output end of the first transmission band-pass filter 95 is electrically connected to an input end of the first transmission amplifier 81, an output end of the first transmission amplifier 81 is electrically connected to an input end of the second transmission band-pass filter 96, an output end of the second transmission band-pass filter 96 is electrically connected to an input end of the second transmission amplifier 82, and an output end of the second transmission amplifier 82 outputs a transmission radio frequency signal through the isolator 11. The rf modulated signal is band-pass filtered by a first transmit band-pass filter 95 and a second transmit band-pass filter 96 to filter out-of-band spurs. The radio frequency modulation signal is power-amplified by the first transmission amplifier 81 and the second transmission amplifier 82, so as to meet the transmission power requirement, and the port isolation degree and the port standing wave of the transmission output are ensured by the isolator 11.
Further, the frequency conversion and gain control unit 3 includes a gain control unit 32 and a mixer 31, the receiving channel further includes a filter assembly 9, the filter assembly 9 includes a first band-pass filter 92, a first low-pass filter 91 and a second band-pass filter 93, the receiving and amplifying unit 4 includes at least a first receiving amplifier 41, the gain control unit 32 includes a frequency conversion gain controller 321, a coupler 322, a detector 323 and an integrator 324, the frequency conversion gain controller 321 is electrically connected to the input end of the coupler 322 through the second band-pass filter 93 and the first receiving amplifier 41, the coupler 322 has at least a first output end, the first output end of the coupler 322 is electrically connected to the input end of the detector 323, the output end of the detector is electrically connected to the input end of the integrator 324, the output end of the integrator 324 is electrically connected to the frequency conversion gain controller 321, the input end of the mixer 31 is electrically connected to the low noise amplifying unit 2, the output terminal of the mixer 31 and the input terminal of the variable frequency gain controller 321 are electrically connected through a first low pass filter 91 and a first band pass filter 92.
The mixer 31 down-converts the signal amplified by the low noise amplifier to an intermediate frequency signal, and the first low pass filter 91 suppresses high frequency spurs while ensuring that the intermediate frequency signal passes through, the spurs mainly being 7050MHz local frequency spurs and high frequency combined spurs generated by the mixer 31; the first band-pass filter 92 performs band-pass filtering on an intermediate frequency signal to filter out-of-band noise and near-end spurious of the intermediate frequency signal, thereby ensuring the signal-to-noise ratio and the spectral purity of the intermediate frequency signal. Gain amplification, gain control and down-conversion are performed on an intermediate frequency signal by the conversion gain controller 321, and two intermediate frequency signals are output, wherein the control voltage is from the integrator. The second intermediate frequency signal is subjected to band-pass filtering by the second band-pass filter 93, so that out-of-band noise and near-end stray of the second intermediate frequency signal are filtered, and the signal-to-noise ratio and the spectrum purity of the second intermediate frequency signal are ensured. In addition, the second intermediate frequency signal is power-amplified by the first receiving amplifier 41. The coupler 322 couples the two intermediate frequency signals, the main path is output to the temperature compensation attenuator 10, and the branch path is coupled and output to the detector 323, so that signal isolation between the main path and the branch path is ensured. Envelope detection is carried out on the two intermediate frequency signals through a detector 323, the envelope amplitude of the alternating current signal is converted into direct current voltage, the direct current voltage detected by the detector 323 is integrated through an integrator 324 to be used as control voltage of down-conversion gain control, the control voltage can be automatically adjusted along with the intensity of the input signal, and a closed-loop gain control system is formed.
Further, the receiving channel further includes a temperature-compensated attenuator 10, the coupler 322 is further provided with a second output end, the second output end of the coupler 322 is electrically connected to the input end of the temperature-compensated attenuator 10, the filter assembly 9 further includes a second low-pass filter 94, the receiving and amplifying unit 4 further includes a second receiving amplifier 42 and a third receiving amplifier 43, the output end of the temperature-compensated attenuator 10 sequentially passes through the second receiving amplifier 42, the third receiving amplifier 43 and the second low-pass filter 94 to output an intermediate frequency signal, and the intermediate frequency signal is used for being provided to a baseband for use. The gain change of the receiving channel under the high and low temperature working conditions is compensated through the temperature compensation attenuator 10, and the stability of the two intermediate frequency output power is ensured. The second intermediate frequency signal is power amplified by the second receiving amplifier 42 and the third receiving amplifier 43, so as to meet the 70MHz intermediate frequency output requirement. And low-pass filtering is carried out through the second low-pass filter 94, so that harmonic waves and other high-frequency stray waves of the amplifier are filtered, and the spectral purity of the second intermediate-frequency signal is ensured.
Further, the clock circuit 5 includes a crystal oscillator 51, a power divider 52, a first local oscillator 53, a second local oscillator 54, and a third local oscillator 55, the crystal oscillator 51 is electrically connected to an input terminal of the power divider 52, three output terminals of the power divider 52 are electrically connected to the first local oscillator 53, the second local oscillator 54, and the third local oscillator 55, respectively, an output terminal of the first local oscillator 53 is electrically connected to the mixer 31, an output terminal of the second local oscillator 54 is electrically connected to the conversion gain controller 321, and an output terminal of the third local oscillator 55 is electrically connected to the high-speed rf modulator 7. The clock circuit 5 firstly generates a clock signal of 50MHZ through the crystal oscillator 51, the crystal oscillator adopts a temperature compensation crystal oscillator to ensure the stability and phase noise of the clock, then the clock signal is subjected to power division through the power divider 52, divided into three paths of signals, and respectively generates local oscillator signals of different frequencies through the first local oscillator 53, the second local oscillator 54 and the third local oscillator 55. In this embodiment, a 7050MHz local oscillator signal is generated by the first local oscillator 53 and output to the mixer 31; a 120MHz local oscillator signal is generated by the second local oscillator 54 and output to the variable frequency gain controller 321; and a 8200MHz local oscillation signal is generated by the third local oscillator 55 and output to the high-speed radio frequency modulator 7. The local oscillator in this embodiment adopts a phase-locked local oscillation mode, and has lower phase noise and higher spurious suppression. In this embodiment, the frequency of the first local oscillator 53 is 7050MHz, the first intermediate frequency is 190MHz, the frequency of the second local oscillator 54 is 120MHz, the second intermediate frequency is 70MHz, the frequency of the third local oscillator 55 is 8200MHz, the frequency of the transmitted radio frequency signal is 8200MHz, or the frequency of the transmitted radio frequency signal of other satellite X frequency bands, and the frequency of the crystal oscillator is 50 MHz.
Further, in this embodiment, the low noise amplification unit 2 includes a first low noise amplifier 21 and a second low noise amplifier 22, the combiner 1 has two input ends, the two input ends of the combiner 1 are used for accessing a radio frequency signal, and the output end of the combiner 1 is electrically connected to the frequency conversion and gain control unit 3 sequentially through the first low noise amplifier 21 and the second low noise amplifier 22. And power synthesis is carried out on the two paths of received signals through the combiner 1, and the synthesized signals are output to a low-noise amplifier. The received radio frequency signal is subjected to secondary low-noise amplification, so that the noise coefficient of the receiver is ensured, and the sensitivity of the receiver is ensured.
Further, in this embodiment, the first transmit amplifier 81 and the second transmit amplifier 82 both use gallium nitride power amplifiers, and the combiner 1 is a radio frequency MMIC integrated combiner, in other embodiments, the first transmit amplifier 81 or the second transmit amplifier 82 may use gallium nitride power amplifiers, or the combiner 1 may also be a radio frequency MMIC integrated combiner. By adopting the radio frequency MMIC integrated combiner, the radio frequency MMIC integrated combiner has light weight and small volume, and improves the radio frequency integration level. By adopting the gallium nitride power amplifier for radio frequency power amplification through the first transmission amplifier 81 or the second transmission amplifier 82, the efficiency and the output power are higher, meanwhile, the heat dissipation performance is better, and the transmission power can be larger than 2 w.
Further, as shown in fig. 4, the present embodiment employs an integrated design, and all components are mounted on a PC104 standard board. The power supply and the low-frequency signal can be interconnected with each other through a standard low-frequency connector; the receiving and transmitting radio frequency port adopts a standard SMA-K connector and is connected to the antenna through a radio frequency cable; the clock and the receiving intermediate frequency port adopt standard SMP connectors and are output to the baseband board card through interconnection among the boards; I. the Q data interface is interconnected with the baseband board card by adopting a high-speed connector.
The embodiment also provides a microsatellite testing and transmitting all-in-one machine, which comprises the radio frequency channel for the microsatellite testing and transmitting all-in-one machine, wherein the radio frequency channel is used for receiving and transmitting radio frequency signals.
Example 2:
the present embodiment is different from embodiment 1 in the specific connection manner of the low noise amplification unit. The utility model provides a radio frequency channel for microsatellite surveys and passes all-in-one, including receiving channel, transmission channel and clock circuit 5, clock circuit 5 provides clock signal for receiving channel and transmission channel, receiving channel includes combiner 1, low noise amplification unit 2, frequency conversion and gain control unit 3 and receiving amplification unit 4, transmission channel includes signal receiving element 6, high-speed radio frequency modulator 7 and power amplification unit 8, combiner 1, low noise amplification unit 2, frequency conversion and gain control unit 3 and receiving amplification unit 4 electricity in proper order connect, signal receiving element 6, high-speed radio frequency modulator 7 and power amplification unit 8 electricity in proper order connect.
In this embodiment, as shown in fig. 3, the low noise amplifying unit 2 includes a first low noise amplifier 21, a second low noise amplifier 22, and a third low noise amplifier 23, an input end of the first low noise amplifier 21 and an input end of the second low noise amplifier 22 are respectively used for receiving a radio frequency signal, an output end of the first low noise amplifier 21 and an output end of the second low noise amplifier 22 are both electrically connected to an input end of the combiner 1, and an output end of the combiner 1 is electrically connected to the frequency conversion and gain control unit 3 through the third low noise amplifier. When receiving radio frequency signals, the first radio frequency signals and the second radio frequency signals are subjected to low noise amplification through the first low noise amplifier 21 and the second low noise amplifier 22 respectively, then are combined through the combiner 1, and are subjected to low noise amplification on the combined signals through the third low noise amplifier 23, and the noise coefficient of the receiver can be further improved by performing low noise amplification processing on the two paths of signals before combination, so that the sensitivity is improved.
The radio frequency channel and the measurement and transmission integrated machine for the microsatellite measurement and transmission integrated machine adopt the standard board card structure, are suitable for the miniaturized use scene of an X-frequency band satellite measurement and control data transmission system, improve the bandwidth of a radio frequency transmission channel and the transmission power through the cooperation of a high-speed radio frequency modulator and a power amplification unit, and can meet the requirement of higher data transmission rate; in the invention, a signal receiving unit adopts a low-voltage differential signal high-speed interface, and simultaneously, through a high-speed radio frequency modulator, broadband amplification, broadband filtering and a high-speed device, the transmission bandwidth is more than 300 MHz; the invention adopts the gallium nitride power amplifier device for amplifying the radio frequency power, has higher efficiency and output power compared with the traditional gallium arsenide power device, and has better heat dissipation performance, and the transmitting power can be more than 2 w; in the invention, the radio frequency MMIC combiner is adopted, so that the radio frequency MMIC combiner is light in weight and small in size, and the combiner is easy to integrate on a radio frequency board card, thereby improving the radio frequency integration level and reducing the size and weight of a radio frequency channel.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (5)
1. A radio frequency channel for a microsatellite measurement and transmission all-in-one machine is characterized by comprising a receiving channel, a transmitting channel and a clock circuit (5), wherein the clock circuit (5) provides clock signals for the receiving channel and the transmitting channel,
the receiving channel comprises a combiner (1), a low-noise amplifying unit (2), a frequency conversion and gain control unit (3), a receiving amplifying unit (4), a filter component (9) and a temperature compensation attenuator (10), the transmitting channel comprises a signal receiving unit (6), a high-speed radio frequency modulator (7), a power amplifying unit (8) and a band-pass filtering unit, the combiner (1), the low-noise amplifying unit (2), the frequency conversion and gain control unit (3) and the receiving amplifying unit (4) are electrically connected in sequence, the frequency conversion and gain control unit (3) comprises a gain control unit (32) and a frequency mixer (31), the filter component (9) comprises a first band-pass filter (92), a first low-pass filter (91) and a second band-pass filter (93), the receiving amplifying unit (4) at least comprises a first receiving amplifier (41), the gain control unit (32) comprises a variable frequency gain controller (321), a coupler (322), a detector (323) and an integrator (324), the variable frequency gain controller (321) is electrically connected with the input end of the coupler (322) through the second band-pass filter (93) and the first receiving amplifier (41), the coupler (322) is provided with a first output end and a second output end, the first output end of the coupler (322) is electrically connected with the input end of the detector (323), the output end of the detector (323) is electrically connected with the input end of the integrator (324), the output end of the integrator (324) is electrically connected with the variable frequency gain controller (321), the input end of the mixer (31) is electrically connected with the low noise amplification unit (2), and the output end of the mixer (31) is electrically connected with the input end of the variable frequency gain controller (321) through the first low pass filter (91) and the integrator (324) The first band pass filter (92) is electrically connected; the second output end of the coupler (322) is electrically connected with the input end of the temperature-compensated attenuator (10), the filter assembly (9) further comprises a second low-pass filter (94), the receiving and amplifying unit (4) further comprises a second receiving amplifier (42) and a third receiving amplifier (43), the output end of the temperature-compensated attenuator (10) sequentially passes through the second receiving amplifier (42), the third receiving amplifier (43) and the second low-pass filter (94) to output an intermediate frequency signal, and the intermediate frequency signal is used for being provided for a baseband;
the band-pass filtering unit comprises a first transmission band-pass filter (95) and a second transmission band-pass filter (96), the power amplification unit (8) comprises a first transmit amplifier (81) and a second transmit amplifier (82), the output end of the high-speed radio frequency modulator (7) is electrically connected with the input end of the first transmitting band-pass filter (95), the output of the first transmit bandpass filter (95) is electrically connected to the input of the first transmit amplifier (81), the output end of the first transmitting amplifier (81) is electrically connected with the input end of the second transmitting band-pass filter (96), the output of the second transmit bandpass filter (96) is electrically connected to the input of the second transmit amplifier (82), the output end of the second transmitting amplifier (82) outputs a transmitting radio frequency signal through an isolator (11);
the signal receiving unit (6), the high-speed radio frequency modulator (7) and the power amplifying unit (8) are electrically connected in sequence;
the signal receiving unit (6) comprises a low-voltage differential signal receiver (61) and a low-voltage differential signal driver (62), wherein the low-voltage differential signal receiver (61) is used for receiving a low-voltage differential signal transmitted by a baseband, an input end of the low-voltage differential signal driver (62) is electrically connected with an output end of the low-voltage differential signal receiver (61), and an output end of the low-voltage differential signal receiver (61) is electrically connected with an input end of the high-speed radio frequency modulator (7); the first transmitting amplifier (81) and the second transmitting amplifier (82) both adopt gallium nitride power amplifiers, and the combiner (1) is a radio frequency MMIC integrated combiner.
2. The radio frequency channel for the microsatellite measurement and transmission integrated machine as claimed in claim 1, characterized in that the clock circuit (5) comprises a crystal oscillator (51), a power divider (52), a first local oscillator (53), a second local oscillator (54) and a third local oscillator (55), the crystal oscillator (51) is electrically connected with an input end of the power divider (52), three output ends of the power divider (52) are respectively electrically connected with the first local oscillator (53), the second local oscillator (54) and the third local oscillator (55), the output of the first local oscillator (53) is electrically connected to the mixer (31), the output end of the second local oscillator (54) is electrically connected with the frequency conversion gain controller (321), the output end of the third local oscillator (55) is electrically connected with the high-speed radio frequency modulator (7).
3. The radio frequency channel for the microsatellite transmission and measurement all-in-one machine as claimed in claim 1, wherein the low noise amplification unit (2) comprises a first low noise amplifier (21) and a second low noise amplifier (22), the combiner (1) is provided with two input ends, the two input ends of the combiner (1) are used for accessing radio frequency signals, and the output end of the combiner (1) is electrically connected with the frequency conversion and gain control unit (3) through the first low noise amplifier (21) and the second low noise amplifier (22) in sequence.
4. The radio frequency channel for the microsatellite transmission and measurement all-in-one machine as claimed in claim 1, wherein the low noise amplification unit (2) comprises a first low noise amplifier (21), a second low noise amplifier (22) and a third low noise amplifier, the input end of the first low noise amplifier (21) and the input end of the second low noise amplifier (22) are respectively used for accessing radio frequency signals, the output end of the first low noise amplifier (21) and the output end of the second low noise amplifier (22) are both electrically connected with the input end of the combiner (1), and the output end of the combiner (1) is electrically connected with the frequency conversion and gain control unit (3) through the third low noise amplifier.
5. An all-in-one machine for measuring and transmitting a microsatellite, which comprises the radio frequency channel for an all-in-one machine for measuring and transmitting a microsatellite, as claimed in any one of claims 1 to 4.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011338399.6A CN112468221B (en) | 2020-11-25 | 2020-11-25 | Radio frequency channel for microsatellite measurement and transmission all-in-one machine and measurement and transmission all-in-one machine |
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| CN202011338399.6A CN112468221B (en) | 2020-11-25 | 2020-11-25 | Radio frequency channel for microsatellite measurement and transmission all-in-one machine and measurement and transmission all-in-one machine |
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| CN112468221A CN112468221A (en) | 2021-03-09 |
| CN112468221B true CN112468221B (en) | 2022-08-02 |
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| CN113556146B (en) * | 2021-07-22 | 2022-07-05 | 北京微纳星空科技有限公司 | Measurement and control transponder and measurement and control response system loaded on controlled satellite |
| CN113794502B (en) * | 2021-09-02 | 2023-05-05 | 上海卫星工程研究所 | Mars surrounding device measurement and control data transmission integrated system and method |
| CN114355388B (en) * | 2021-12-30 | 2023-04-07 | 浙江时空道宇科技有限公司 | Dual-frequency transmitting assembly and system for low-earth-orbit satellite navigation enhancement system |
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| WO2016073940A1 (en) * | 2014-11-06 | 2016-05-12 | GM Global Technology Operations LLC | Dynamic range of wideband rf front end using delta sigma converters with envelope tracking and injected digitally equalized transmit signal |
| CN109117147B (en) * | 2018-06-28 | 2021-11-16 | 上海卫星工程研究所 | Passive positioning satellite load software reconstruction rapid implementation method based on large data volume |
| CN109560854A (en) * | 2018-10-17 | 2019-04-02 | 上海航天电子有限公司 | A kind of one-board feed element applied to micro-nano satellite |
| CN109474293B (en) * | 2018-12-24 | 2021-02-19 | 南京屹信航天科技有限公司 | Channel signal processing method for satellite-borne measurement and control equipment |
| CN110808770B (en) * | 2019-09-25 | 2022-05-24 | 西安空间无线电技术研究所 | Integrated measurement and control terminal |
| CN111030746B (en) * | 2019-11-20 | 2022-03-18 | 上海卫星工程研究所 | Electronic topology framework for micro-nano satellite |
| CN210469240U (en) * | 2019-12-09 | 2020-05-05 | 天津光电通信技术有限公司 | High-stability forward automatic gain control circuit |
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