Satellite-borne high-reliability low-power-consumption UHF frequency band channel

Abstract

The invention provides a satellite-borne high-reliability low-power-consumption UHF (Ultra High Frequency) band channel, which is characterized by comprising a duplexer, a receiving channel, a crystal oscillation circuit, a channel frequency control module and a transmitting channel, and is characterized in that the duplexer is used for receiving and transmitting radio frequency signals; the receiving channel realizes signal amplification and frequency conversion functions, and adopts secondary frequency conversion; the crystal oscillator circuit is used for generating and providing stable clock signals for a receiving channel and a transmitting channel to use, the crystal oscillator is a high-reliability crystal oscillator, and a glue pouring process is adopted in the process; a transmitting channel adopts one-time frequency conversion and comprises an ALC circuit, and a GaN-form power amplifier is used for power amplification. According to the invention, low-power consumption and reliable design is realized by applying an integrated circuit and frequency flow setting through a receiving channel, and meanwhile, the stability of the circuit is ensured by applying a GAN process power amplifier and an ALC circuit in a transmitter. Meanwhile, high-reliability improvement is guaranteed through circuit derating and sensitive circuit processes, and satellite-borne application can be met.

Description

Technical Field

[0001] The present invention relates to the field of satellite-borne measurement and control communications, and in particular to a satellite-borne high-reliability and low-power consumption UHF frequency band channel. Background Art

[0002] As the requirements for measurement and control subsystems in the space-borne field become higher and higher, the demand for high reliability, miniaturization and low power consumption is becoming more and more urgent. In particular, the demand for high reliability, miniaturization and low power consumption in the deep space field (including Mars exploration) is the most urgent.

[0003] On the premise of ensuring the miniaturization and low power consumption of the channel, it is also necessary to meet the high reliability requirements of the satellite and the inspection of various reliability tests. This places high demands on the reliability and integration of the design, and requires targeted design.

[0004] After searching, two patent documents related to the present invention were found, including:

[0005] In the patent document with publication number CN 105790823 A, a convenient measurement, control and communication system for micro-nano satellites based on the civilian UHF frequency band is described, which includes a satellite-borne UHF frequency band transmitting and receiving system, a ground-borne UHF frequency band transmitting and receiving system, a servo system and an industrial computer. The difference from the present invention is that the present invention emphasizes the design of high reliability and low power consumption of the satellite-borne UHF frequency band channel rather than focusing on the system composition.

[0006] In the patent document with publication number CN 217985079 U, a UHF band satellite communication analog transponder is recorded, which includes a duplexer, a low noise amplifier, a mixer, a 45MHz constant temperature crystal oscillator, a bandpass filter, a π-type attenuator and an adjustable attenuator. The duplexer realizes the isolation of transmission and reception, so that the transmission and reception work simultaneously without interfering with each other; the low noise amplifier amplifies the weak received signal to improve the signal-to-noise ratio of the received signal; the mixer and the 45MHz constant temperature crystal oscillator complete the frequency conversion of the radio frequency signal; the bandpass filter filters out-of-band signals and allows in-band signals to pass; the π-type attenuator and the adjustable attenuator cooperate to complete the receiving and transmitting level matching. The difference from the present invention is that the intermediate frequency receiving circuit of the present invention is realized in an integrated manner, which reduces power consumption and improves reliability. Summary of the invention

[0007] In view of this, the present invention proposes a design scheme for a satellite-borne high-reliability and low-power UHF frequency band channel, adopts a high-integration scheme, integrated design technology, and successfully applies a high-efficiency power amplifier for the first time to achieve miniaturization of the channel. At the same time, high reliability improvement is guaranteed through circuit derating and sensitive circuit technology.

[0008] Specifically, the present invention provides a satellite-borne high-reliability and low-power consumption UHF frequency band channel, characterized in that it includes: a duplexer, a receiving channel, a crystal oscillator circuit, a channel frequency control module, and a transmitting channel.

[0009] The duplexer transmits and receives radio frequency signals;

[0010] The receiving channel receives the uplink input signal from the duplexer, realizes the signal amplification and frequency conversion functions, and outputs the signal to the digital baseband. The receiving channel adopts secondary frequency conversion;

[0011] The crystal oscillator circuit is used to generate and provide a stable clock signal for use by the receiving channel and the transmitting channel. The crystal oscillator adopts a high-reliability crystal oscillator, which is placed on the mounting surface and has a small structural cavity. The process adopts a glue-filling process;

[0012] The channel frequency control module realizes frequency adaptive switching between the receiving channel and the transmitting channel through the control signal output by the digital baseband;

[0013] The transmitting channel up-converts the intermediate frequency input signal from the digital baseband into a transmitting radio frequency signal, filters and power-amplifies the signal, and outputs it to the duplexer. The transmitting channel uses a single frequency conversion, includes an ALC circuit, and uses a GaN power amplifier for power amplification.

[0014] Furthermore, the receiving channel includes a primary frequency conversion module and an integrated intermediate frequency module. The primary frequency conversion module completes primary frequency conversion, and the integrated intermediate frequency module realizes integrated intermediate frequency. The output signal of the integrated intermediate frequency is filtered and amplified, and then the output signal is output to the digital baseband. In addition, the AGC voltage is detected to realize automatic gain control of the integrated intermediate frequency. The integrated intermediate frequency module is implemented in an integrated manner and designed using an integrated chip.

[0015] Furthermore, the primary frequency conversion module includes a low-noise amplifier, a first filter, a mixer A and a second filter connected in sequence. The uplink input signal enters the low-noise amplifier after passing through the duplexer, is filtered by the first filter and then sent to mixer A, and the output signal is then sent to the second filter for filtering to complete the primary frequency conversion; the integrated intermediate frequency module includes three amplifiers and mixer 2 connected in sequence. After the primary frequency conversion, the output signal is amplified by three amplifiers in three stages and then sent to mixer 2 to realize the integrated intermediate frequency.

[0016] Furthermore, a filter with a corresponding frequency and a suitable bandwidth is designed in the receiving channel.

[0017] Furthermore, the transmitting channel includes a mixer B, a filter B, an ALC circuit, a first isolator, a GaN high-efficiency power amplifier, and a second isolator connected in sequence.

[0018] Furthermore, the three output clock signals are respectively sent to the phase-locked local oscillator A, the second local oscillator and the phase-locked local oscillator B. The phase-locked local oscillator A receives the clock signal and the phase-locked local oscillator A control signal output by the digital baseband, acts on the mixer A of the receiving channel, and realizes the adaptive switching of the receiving channel frequency; the second local oscillator provides the second local oscillator signal for the integrated intermediate frequency module, performs a secondary frequency conversion on the radio frequency signal to a low-frequency sample and then sends it to the digital baseband for processing; the phase-locked local oscillator B receives the clock signal and the phase-locked local oscillator B control signal output by the digital baseband, acts on the mixer B of the transmitting channel, and realizes the adaptive switching of the transmitting channel frequency.

[0019] Furthermore, the channel frequency control module realizes adaptive switching of the receiving channel frequency through the phase-locked local oscillator A control signal output by the digital baseband and reserves software control instructions M0-M4, thereby ensuring the versatility of the receiving channel; and realizes adaptive switching of the transmitting channel frequency through the phase-locked local oscillator B control signal output by the digital baseband and reserves software control instructions M5-M8, thereby ensuring the versatility of the transmitting channel.

[0020] Furthermore, in the transmitting channel, the transmitted RF signal passes through an ALC circuit composed of an electrically adjustable attenuator, a primary amplifier, and a final pre-amplifier to achieve a first-stage amplification of the transmitting power and stable control of the output power. The ALC circuit dynamically adjusts its own gain according to the size of the input signal so that it operates in a linear range.

[0021] Furthermore, in the transmitting channel, the ALC circuit sends the signal to the final amplifier, i.e., the GaN power amplifier, for power amplification after being matched by the first isolator, and then outputs the signal through the second isolator.

[0022] Furthermore, the receiving channel adopts a secondary frequency conversion scheme, and after amplification by a low-noise amplifier and the first mixer, a first intermediate frequency signal of 1XX.XXXMHz is obtained, and a local oscillator frequency is 3XX.XXXMHz, which is obtained by multiplying the 10MHz clock signal output by a phase-locked multiplier by 1. The first intermediate frequency signal is mixed twice to obtain a second intermediate frequency signal of 7X.XXXMHz, and the second local oscillator frequency is 40MHz, which is obtained by multiplying the 10MHz clock signal output by 4. The second intermediate frequency signal is divided into two paths after being processed by the second intermediate frequency amplifier circuit, one path goes to the AGC detection path, and after extracting the AGC control signal, it is used to control the gain of the first intermediate frequency amplifier to form an AGC loop, and the other path goes to the digital baseband circuit.

[0023] The advantages of the present invention compared with the existing technology are:

[0024] The present invention realizes low power consumption and reliability design by applying integrated circuits and frequency process settings in the receiving channel. At the same time, the stability of the circuit is ensured by applying the GAN process power amplifier and the ALC circuit in the transmitter. At the same time, circuit derating measures such as voltage derating, current derating, power consumption derating, power amplifier power back-off, and the like are adopted. The process of glue filling and separate shielding and isolation is adopted for sensitive circuits such as crystal oscillators to ensure high reliability improvement, which can meet the requirements of satellite-borne applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The present invention is a block diagram of the implementation of the satellite-borne high-reliability and low-power consumption UHF frequency band channel.

[0026] Figure 2 The present invention is a block diagram of a high-reliability and low-power transmission power amplifier. DETAILED DESCRIPTION

[0027] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0028] Figure 1 FIG. 1 is a block diagram of the implementation of the satellite-borne high-reliability and low-power consumption UHF frequency band channel of the present invention. Figure 1 As shown, the satellite-borne high-reliability and low-power consumption UHF frequency band channel of the present invention includes: a duplexer, a receiving channel, a crystal oscillator circuit, a channel frequency control module, and a transmitting channel. The frequency interval between the receiving channel and the transmitting channel is 30M, and the receiving and transmitting isolation needs to meet 80dB.

[0029] The duplexer transmits and receives radio frequency signals.

[0030] The receiving channel realizes the functions of signal amplification and frequency conversion, including primary frequency conversion and integrated intermediate frequency. The primary frequency conversion includes a low noise amplifier, a first filter, a mixer A and a second filter connected in sequence. The uplink input signal enters the low noise amplifier after passing through the duplexer, and is sent to mixer A after filtering by the first filter. The output signal is then sent to the second filter for filtering to complete the primary frequency conversion. The integrated intermediate frequency includes three amplifiers and mixer 2 connected in sequence. After the primary frequency conversion, the output signal is amplified by three amplifiers in three stages and sent to mixer 2 to realize the integrated intermediate frequency. After the integrated intermediate frequency, the output signal is filtered and amplified, and then the signal is output to the digital baseband. In addition, the AGC voltage is detected to realize the automatic gain control of the integrated intermediate frequency. By designing filters corresponding to the RF signal frequency and bandwidth before and after the two-stage mixer in the double frequency conversion receiver scheme, the interference suppression capability of the receiver link is improved.

[0031] The receiving channel adopts a secondary frequency conversion scheme, and obtains a 1XX.XXXMHz intermediate frequency signal after amplification by a low noise amplifier and the first mixer. The frequency of a local oscillator is 3XX.XXXMHz, which is obtained by multiplying the 10MHz clock signal by 1 through a phase-locked frequency multiplier. The first intermediate frequency signal is mixed twice to obtain a second intermediate frequency signal of 7X.XXXMHz. The second local oscillator frequency is 40MHz, which is obtained by multiplying the 10MHz clock signal by 4. The second intermediate frequency signal is processed by the second intermediate amplifier circuit and divided into two paths. One path goes to the AGC detection path, extracts the AGC control signal and controls the gain of the first intermediate amplifier to form an AGC loop, and the other path goes to the digital baseband circuit. The selection of the filter in the secondary frequency conversion scheme improves the reception selectivity and the reliable suppression of interference. The receiving channel phase-locked source reserves control instructions (M0-M4), and the frequency switching of the receiving channel is realized through instructions.

[0032] The integrated intermediate frequency module is implemented in an integrated manner. The function of this circuit is to amplify the pre-IF amplifier signal, control the signal gain, and then send it to the mixer for frequency conversion processing. The integrated intermediate frequency module is designed with an integrated chip to reduce power consumption and improve reliability.

[0033] The crystal oscillator circuit is used to generate and provide stable clock signals for the receiving channel and the transmitting channel. The crystal oscillator circuit uses a high-reliability crystal oscillator to output three clock signals to the phase-locked local oscillator A, the second local oscillator, and the phase-locked local oscillator B. The phase-locked local oscillator A receives the clock signal and the phase-locked local oscillator A control signal output by the digital baseband, and acts on the mixer A of the receiving channel to achieve adaptive frequency switching of the receiving channel. The phase-locked local oscillator B receives the clock signal and the phase-locked local oscillator B control signal output by the digital baseband, and acts on the mixer B of the transmitting channel to achieve adaptive frequency switching of the transmitting channel. The second local oscillator provides the second local oscillator signal for the integrated intermediate frequency module, and performs secondary frequency conversion of the RF signal to low-frequency sampling and then sends it to the digital baseband for processing. The crystal oscillator circuit is installed in an independent structural cavity of the channel to achieve separate shielding, and the crystal oscillator is glued to ensure reliability.

[0034] The crystal oscillator uses a high-reliability crystal oscillator, and outputs the signal to the receiving and transmitting channels through power division. The crystal oscillator is placed on the installation surface during channel design, and a small structural cavity is left. The glue filling process is adopted in the process to ensure reliability.

[0035] The channel frequency control module realizes adaptive switching of the receiving channel frequency through the phase-locked local oscillator A control signal output by the digital baseband (reserved software control instructions M0-M4) to ensure the versatility of the receiving channel; and realizes adaptive switching of the transmitting channel frequency through the phase-locked local oscillator B control signal output by the digital baseband (reserved software control instructions M5-M8) to ensure the versatility of the transmitting channel.

[0036] The transmission channel adopts a single frequency conversion scheme, and the transmission channel frequency is switched adaptively, including a mixer B, a filter B, an ALC circuit, a first isolator, a GaN high-efficiency power amplifier, and a second isolator connected in sequence. The intermediate frequency input signal from the digital baseband is mixed and filtered by mixer B and filter B before being sent to the ALC circuit.

[0037] The transmission channel adopts a single frequency conversion scheme, firstly, the intermediate frequency input signal sent by the digital baseband module is up-converted into the transmission RF signal, and the signal is filtered and power amplified before being sent to the duplexer for transmission output. The transmission local oscillator adopts variable frequency, and the control instructions (M5-M8) are used to adjust the switching of the transmission RF signal between frequency points.

[0038] Figure 2 FIG. 1 is a block diagram of the implementation of the high-reliability and low-power transmission power amplifier of the present invention. Figure 2 As shown, the transmitted RF signal passes through the ALC circuit composed of an electrically adjustable attenuator, a primary amplifier, and a final pre-amplifier to achieve the first-stage amplification of the transmitted power and stable control of the output power. The ALC circuit can dynamically adjust its own gain according to the size of the input signal so that it works in the linear range. After matching through the first isolator, the ALC circuit sends the signal to the final amplifier (GaN high-efficiency power amplifier) ​​for power amplification and then outputs it through the second isolator. The use of GaN high-efficiency power tubes combined with the ALC circuit ensures output stability while improving efficiency, with the efficiency increased from the traditional 30% to 50%.

[0039] The power amplifier uses a GaN power amplifier, which can not only increase the output power and reduce the power consumption of a single unit, but also reduce power loss, which is beneficial to reduce the junction temperature of the power amplifier and the heat dissipation of the whole unit. The power amplifier contains an ALC circuit to ensure that the power amplifier is not damaged in the case of over-excitation, and to ensure the stability requirements of power output under high and low temperature conditions.

[0040] The satellite-borne high-reliability and low-power consumption UHF frequency band channel of the present invention has the advantages of improving reception reliability through a secondary frequency conversion scheme, while achieving improved transmission reliability and stability through a high-efficiency power amplifier together with ALC control.

[0041] The contents not described in detail in the specification of the present invention belong to the well-known technologies of professionals in the field.

Claims

1. A satellite-borne high-reliability, low-power consumption UHF frequency band channel, characterized in that: It includes: Duplexer, receiving channel, crystal oscillator circuit, channel frequency control module, transmitting channel, The duplexer transmits and receives radio frequency signals; The receiving channel receives the uplink input signal from the duplexer, realizes the signal amplification and frequency conversion functions, and outputs the signal to the digital baseband. The receiving channel adopts secondary frequency conversion; The crystal oscillator circuit is used to generate and provide a stable clock signal for use by the receiving channel and the transmitting channel. The crystal oscillator adopts a high-reliability crystal oscillator, which is placed on the mounting surface and has a small structural cavity. The process adopts a glue-filling process; The channel frequency control module realizes frequency adaptive switching between the receiving channel and the transmitting channel through the control signal output by the digital baseband; The transmitting channel up-converts the intermediate frequency input signal from the digital baseband into a transmitting radio frequency signal, filters and power-amplifies the signal, and outputs it to the duplexer. The transmitting channel uses a single frequency conversion, includes an ALC circuit, and uses a GaN power amplifier for power amplification.

2. The satellite-borne high-reliability and low-power consumption UHF frequency band channel according to claim 1, characterized in that: The receiving channel includes a primary frequency conversion module and an integrated intermediate frequency module. The primary frequency conversion module completes primary frequency conversion, and the integrated intermediate frequency module realizes integrated intermediate frequency. The output signal of the integrated intermediate frequency is filtered and amplified, and then the output signal is output to the digital baseband. In addition, the AGC voltage is detected to realize automatic gain control of the integrated intermediate frequency. The integrated intermediate frequency module is implemented in an integrated manner and designed using an integrated chip.

3. The satellite-borne high-reliability and low-power consumption UHF frequency band channel according to claim 2, characterized in that: The primary frequency conversion module includes a low-noise amplifier, a first filter, a mixer A and a second filter connected in sequence. The uplink input signal enters the low-noise amplifier after passing through the duplexer, is filtered by the first filter and then sent to mixer A, and the output signal is then sent to the second filter for filtering to complete the primary frequency conversion; the integrated intermediate frequency module includes three amplifiers and mixer 2 connected in sequence. After the primary frequency conversion, the output signal is amplified by three amplifiers in three stages and then sent to mixer 2 to realize the integrated intermediate frequency.

4. The satellite-borne high-reliability and low-power consumption UHF frequency band channel according to claim 3 is characterized in that: Design a filter with corresponding frequency and appropriate bandwidth in the receiving channel.

5. The satellite-borne high-reliability and low-power consumption UHF frequency band channel according to claim 1, characterized in that: The transmitting channel includes a mixer B, a filter B, an ALC circuit, a first isolator, a GaN high-efficiency power amplifier, and a second isolator which are connected in sequence.

6. The satellite-borne high-reliability and low-power consumption UHF frequency band channel according to claim 1, characterized in that: The three output clock signals are respectively sent to the phase-locked local oscillator A, the second local oscillator and the phase-locked local oscillator B. The phase-locked local oscillator A receives the clock signal and the phase-locked local oscillator A control signal output by the digital baseband, acts on the mixer A of the receiving channel, and realizes the adaptive switching of the receiving channel frequency; the second local oscillator provides the second local oscillator signal for the integrated intermediate frequency module, performs secondary frequency conversion on the radio frequency signal to low-frequency sampling and then sends it to the digital baseband for processing; the phase-locked local oscillator B receives the clock signal and the phase-locked local oscillator B control signal output by the digital baseband, acts on the mixer B of the transmitting channel, and realizes the adaptive switching of the transmitting channel frequency.

7. The satellite-borne high-reliability and low-power consumption UHF frequency band channel according to claim 1, characterized in that: The channel frequency control module realizes adaptive switching of the receiving channel frequency through the phase-locked local oscillator A control signal output by the digital baseband and reserves software control instructions M0-M4, thereby ensuring the versatility of the receiving channel; realizes adaptive switching of the transmitting channel frequency through the phase-locked local oscillator B control signal output by the digital baseband and reserves software control instructions M5-M8, thereby ensuring the versatility of the transmitting channel.

8. The satellite-borne high-reliability and low-power consumption UHF frequency band channel according to claim 1, characterized in that: In the transmitting channel, the transmitting RF signal passes through the ALC circuit composed of an electrically adjustable attenuator, a primary amplifier, and a final pre-amplifier to achieve the first-level amplification of the transmitting power and stable control of the output power. The ALC circuit dynamically adjusts its own gain according to the size of the input signal so that it works in a linear range.

9. The satellite-borne high-reliability and low-power consumption UHF frequency band channel according to claim 8, characterized in that: In the transmitting channel, the ALC circuit sends the signal to the final amplifier, i.e., the GaN power amplifier, after being matched by the first isolator, for power amplification and then outputs the signal through the second isolator.

10. The satellite-borne high-reliability and low-power consumption UHF frequency band channel according to claim 1, characterized in that: The receiving channel adopts a secondary frequency conversion scheme. After amplification by a low-noise amplifier and the first mixer, a first intermediate frequency signal of 1XX.XXXMHz is obtained. The local oscillator frequency is 3XX.XXXMHz, which is obtained by multiplying the 10MHz clock signal output by a phase-locked multiplier. The first intermediate frequency signal is mixed twice to obtain a second intermediate frequency signal of 7X.XXXMHz. The second local oscillator frequency is 40MHz, which is obtained by multiplying the 10MHz clock signal output by 4 times. The second intermediate frequency signal is divided into two paths after being processed by the second intermediate frequency amplifier circuit. One path goes to the AGC detection path, extracts the AGC control signal to control the gain of the first intermediate frequency amplifier to form an AGC loop, and the other path goes to the digital baseband circuit.

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