CN116054915A - C-band spaceborne measurement and control transponder and spaceborne measurement and control system - Google Patents
C-band spaceborne measurement and control transponder and spaceborne measurement and control system Download PDFInfo
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- CN116054915A CN116054915A CN202310033052.8A CN202310033052A CN116054915A CN 116054915 A CN116054915 A CN 116054915A CN 202310033052 A CN202310033052 A CN 202310033052A CN 116054915 A CN116054915 A CN 116054915A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18513—Transmission in a satellite or space-based system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
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- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/18502—Airborne stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18515—Transmission equipment in satellites or space-based relays
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The application discloses a C-band spaceborne measurement and control transponder and a spaceborne measurement and control system, and relates to the technical field of spaceflight measurement and control. The satellite-borne measurement and control transponder comprises: baseband module, radio frequency module. The baseband module is connected with the radio frequency module; the base band module is provided with a plurality of radio frequency chips, the radio frequency chips are communicated by utilizing a primary frequency conversion architecture, the radio frequency chips are divided into two groups, one group of radio frequency chips are connected with a receiving channel arranged in the radio frequency module, the other group of radio frequency chips are arranged in a transmitting channel in the radio frequency module, and all the radio frequency chips are connected with an FPGA arranged in the base band module. The plurality of radio frequency chips can effectively reduce the volume and the power consumption of products, and simultaneously isolate the received signals and the transmitted signals, so that the interference to the received signals and the transmitted signals is avoided, and the integration level of the C-band satellite-borne measurement and control transponder is improved.
Description
Technical Field
The application relates to the technical field of aerospace measurement and control, in particular to a C-band spaceborne measurement and control transponder and a spaceborne measurement and control system.
Background
The satellite-borne measurement and control transponder is a main channel for satellite-ground communication, is used for realizing tracking and orbit measurement of satellites in cooperation with a ground measurement and control station, and completing the tasks of transmitting information such as remote control and remote measurement. With the development of aerospace industry in China, the number of medium-low orbit satellites is continuously increased, and simultaneously, higher requirements are put on the precision of satellite measurement and control. As an indispensable component of satellites, there is also an increasing demand for high-precision satellite-borne measurement and control transponders. At present, the satellite-borne measurement and control transponder is mainly concentrated in a B wave band, products in a C wave band are fewer, and the volume and the power consumption of the satellite-borne measurement and control transponder in the B wave band are larger.
In view of the above-mentioned problems, it is a problem to be solved by those skilled in the art to find a satellite-borne measurement and control transponder which is small in size, low in power consumption, high in integration level, high in reliability and cost-effective.
Disclosure of Invention
The purpose of the application is to provide a C-band spaceborne measurement and control transponder and a spaceborne measurement and control system, which are used for reducing the volume, reducing the power consumption, improving the integration level and the reliability and saving the cost.
For solving the technical problem, the application provides a C wave band satellite-borne measurement and control transponder, which comprises: a baseband module and a radio frequency module;
the baseband module is connected with the radio frequency module; the base band module is provided with a plurality of radio frequency chips, the radio frequency chips are communicated by utilizing a primary frequency conversion architecture, the radio frequency chips are divided into two groups, one group of radio frequency chips are connected with a receiving channel arranged in the radio frequency module, the other group of radio frequency chips are arranged in a transmitting channel in the radio frequency module, and all the radio frequency chips are connected with an FPGA arranged in the base band module. Preferably, the receiving channel provided in the radio frequency module includes: a first low noise amplifier, a second low noise amplifier, a first band-pass filter, a second band-pass filter, a first mixer, a first demultiplexer, a first amplifier, a first low-pass filter;
the first low noise amplifier is connected with the first band-pass filter, the first band-pass filter is connected with the second low noise amplifier, the second low noise amplifier is connected with the first mixer, the first mixer is connected with the first multipath branching unit, the first multipath branching unit is connected with multipath receiving intermediate frequency channels, and each path of receiving intermediate frequency channel consists of the second band-pass filter, the first amplifier and the first low pass filter which are sequentially connected.
Preferably, the transmitting channel provided in the radio frequency module includes: the third band-pass filter, the fourth band-pass filter, the second amplifier, the third amplifier, the second mixer, the second low-pass filter, the multiplexer, the power amplifier and the isolator;
the multi-path transmitting intermediate frequency channels are all connected with a multi-path combiner, wherein each path of transmitting intermediate frequency channel consists of a third band-pass filter, a second amplifier, a second low-pass filter, a second mixer and a fourth band-pass filter which are sequentially connected, the number of the transmitting intermediate frequency channels is the same as that of the receiving intermediate frequency channels, the multi-path combiner is connected with the third amplifier, the third amplifier is connected with a power amplifier, and the power amplifier is connected with an isolator.
Preferably, the radio frequency module further comprises: a clock local oscillation circuit;
the clock local oscillation circuit is respectively connected with the first mixer, the second mixer and the baseband module;
wherein, clock local oscillator circuit includes: the device comprises a clock generator, a buffer, a local oscillator receiver, a local oscillator transmitter, a local oscillator driver and a second multipath branching unit;
the clock generator is connected with the buffer and used for sending out a clock signal with fixed frequency; the buffer is respectively connected with the local oscillation receiver, the local oscillation transmitter and the baseband module, the local oscillation receiver is connected with the first mixer, the local oscillation transmitter is connected with the local oscillation driver, the local oscillation driver is connected with the second multipath branching unit, and the second multipath branching unit is connected with the second mixer in each path of transmitting intermediate frequency channel.
Preferably, the radio frequency module further comprises: a power supply processing circuit;
the power supply processing circuit is connected with the baseband module;
wherein the power supply processing circuit includes: the DC-DC conversion circuit, the first LDO and the second LDO;
the DC-DC conversion circuit is connected with a power supply arranged on the baseband module and used for converting a voltage value output by the power supply and outputting a first voltage value; the first LDO and the second LDO are connected with the DC-DC conversion circuit and are used for respectively outputting a corresponding second voltage value and a corresponding third voltage value, wherein the first LDO and the second LDO are connected in parallel, and the first voltage value, the second voltage value and the third voltage value are different.
Preferably, the baseband module further comprises: an anti-surge circuit and EMI;
the anti-surge circuit is connected with an external power supply and EMI, and the EMI is connected with a power supply arranged in the baseband module.
Preferably, the FPGA is made up of at least two XC7a100T chips, at least one XC7a100T chip being connected to a watchdog circuit.
Preferably, 8 radio frequency chips are provided, and the radio frequency chips are AD9361 chips.
Preferably, the baseband module is connected with the radio frequency module through a connector, wherein the connector is an interconnection radio frequency plug-in.
In order to solve the technical problem, the application also provides a satellite-borne measurement and control system which comprises the C-band satellite-borne measurement and control transponder.
The application provides a C wave band spaceborne measurement and control transponder, includes: baseband module, radio frequency module. The baseband module is connected with the radio frequency module; the base band module is provided with a plurality of radio frequency chips, the radio frequency chips are communicated by utilizing a primary frequency conversion architecture, the radio frequency chips are divided into two groups, one group of radio frequency chips are connected with a receiving channel arranged in the radio frequency module, the other group of radio frequency chips are arranged in a transmitting channel in the radio frequency module, and all the radio frequency chips are connected with an FPGA arranged in the base band module. The plurality of radio frequency chips can effectively reduce the volume and the power consumption of products, and simultaneously isolate the received signals and the transmitted signals, so that the interference to the received signals and the transmitted signals is avoided, and the integration level of the C-band satellite-borne measurement and control transponder is improved.
The application also provides a satellite-borne measurement and control system, and the effects are the same as the above.
Drawings
For a clearer description of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described, it being apparent that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a system configuration diagram of a C-band satellite-borne measurement and control transponder according to an embodiment of the present application;
fig. 2 is a system structural diagram of a radio frequency module according to an embodiment of the present application;
FIG. 3 is a circuit diagram of a power supply processing circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic block diagram of a phase-locked local oscillator according to an embodiment of the present application;
fig. 5 is a system configuration diagram of a baseband module according to an embodiment of the present application.
Wherein 10 is a baseband module, and 11 is a radio frequency module.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments herein without making any inventive effort are intended to fall within the scope of the present application.
The core of the application is to provide a C-band spaceborne measurement and control transponder and a spaceborne measurement and control system, which can reduce the volume, reduce the power consumption, improve the integration level and the reliability and save the cost.
In order to provide a better understanding of the present application, those skilled in the art will now make further details of the present application with reference to the drawings and detailed description.
Fig. 1 is a system structure diagram of a C-band on-board measurement and control transponder provided in an embodiment of the present application, as shown in fig. 1, where the C-band on-board measurement and control transponder includes: a baseband module 10 and a radio frequency module 11;
the baseband module is connected with the radio frequency module; the base band module is provided with a plurality of radio frequency chips, the radio frequency chips are communicated by utilizing a primary frequency conversion architecture, the radio frequency chips are divided into two groups, one group of radio frequency chips are connected with a receiving channel arranged in the radio frequency module, the other group of radio frequency chips are arranged in a transmitting channel in the radio frequency module, and all the radio frequency chips are connected with an FPGA arranged in the base band module. Since the transmission input signal is generally a low frequency signal, the low frequency signal needs to be up-converted, and then transmitted to the satellite task, and the signal bit transmitted back by the satellite task is down-converted, and the up-converted signal is referred to as an up-signal and the down-converted signal is referred to as a down-signal in this application. Meanwhile, in the embodiment of the present application, the type and number of the radio frequency chips, the composition of the FPGA, and the like are not limited, and the implementation manner thereof may be determined according to the specific implementation scenario. As a preferred embodiment, the FPGA may be configured with at least two XC7a100T chips, at least one XC7a100T chip being connected to a watchdog circuit, while the number of radio frequency chips is set to 8, and the radio frequency chips are AD9361 chips. When the plurality of radio frequency chips are divided into two groups, each group is provided with 4 radio frequency chips. In order to improve the integration level of the product, reduce the volume and the power consumption of the product, avoid the interference of receiving and transmitting at the same time, adopt the AD9361 chip with low power consumption, eight pieces in total, four-way transmitting and four-way receiving, and isolate the transmitting and receiving circuits independently. Meanwhile, a front-end radio frequency channel is designed, and the design requirement of a C wave band is met in a frequency mixing mode; and a power amplifier module is arranged in the sensor, so that the requirement on sensitivity is met.
It should be noted that, the C-band satellite-borne measurement and control transponder (also referred to as measurement and control transponder) has many technical parameter requirements, specifically: reception sensitivity: less than or equal to-120 dBW; transmitting power: more than or equal to 0.3W (single channel); modulation degree: 0 to 1.5; receiving frequency band: 5.8-6.0 GHz; transmitting frequency band: 5.1 to 5.3GHz; working frequency point transfer ratio: 22/25; delay stability: less than or equal to 1.5m; working mode: four paths of coherent forwarding; modulation mode: master side tone 1mhz, pm modulation.
In order to improve the capturing speed of the FPGA, a direct frequency synthesis technology is provided in the down-conversion process, and the direct frequency synthesis technology mainly comprises a phase accumulator, a phase amplitude conversion circuit, a digital-to-analog conversion circuit and the like. The method is simple to realize, but the size of a lookup table ROM storing phase-to-amplitude conversion and the number of bits of phase precision form an exponential relationship, and has higher requirements on register resources. The bit width N of the lookup table relates to the resolution of the output frequency of the lookup table, i.e. the variation interval of the frequency, and the formula is as follows:
wherein f clk 40MHz.
Note that, the integrated accuracy considers taking n=32, and to save memory resources, 1/4 sine table is sampled.
In addition, according to the characteristics of the C-band satellite-borne measurement and control transponder, the working environment of the C-band satellite-borne measurement and control transponder is large in Doppler change range, and in order to ensure delay stability, after the signals are received, intermediate frequency signals are subjected to down-conversion operation, and the input signals are down-converted to near zero frequency. And filtering the frequency multiplication component by a filter to obtain a low-pass signal, searching in a certain range around the central frequency of the signal to judge whether a carrier signal exists, capturing by adopting 1024-point fast Fourier transform (fast Fourier transform, FFT), obtaining rough frequency, and then transferring to tracking, wherein at the moment, the tracking loop has reasonable loop bandwidth, smaller frequency jitter is realized, and the technical requirement is met.
Fig. 2 is a system structural diagram of a radio frequency module provided in an embodiment of the present application, as shown in fig. 2, a receiving channel disposed in the radio frequency module includes: a first low noise amplifier Q1, a second low noise amplifier Q2, a first band pass filter T1, a second band pass filter T2, a first mixer H1, a first demultiplexer F1, a first amplifier U1, a first low pass filter D1;
the first low noise amplifier is connected with the first band-pass filter, the first band-pass filter is connected with the second low noise amplifier, the second low noise amplifier is connected with the first mixer, the first mixer is connected with the first multipath branching unit, the first multipath branching unit is connected with multipath receiving intermediate frequency channels, and each path of receiving intermediate frequency channel consists of the second band-pass filter, the first amplifier and the first low pass filter which are sequentially connected.
The receiving intermediate frequency channel completes low noise amplification, filtering and down conversion of the uplink C frequency band measurement and control signal, and four paths of power division are respectively used for filtering and amplifying and then outputting intermediate frequency signals to the baseband module.
The receiving intermediate frequency channel is designed according to the requirements of technical parameters as follows:
in the first step, the received signal is amplified with low noise and then enters a band-pass filter, and the filtered signal enters a mixer and generates an intermediate frequency signal. The design of the receiving intermediate frequency channel mainly considers low noise coefficient, high enough gain, high spurious suppression and isolation among channels, and meets the processing requirement of a digital module.
And secondly, designing a reasonable noise coefficient, wherein the noise coefficient of the receiving intermediate frequency channel is mainly determined by the input loss and the noise coefficient of the low-noise amplifier. Wherein NF represents noise, G represents gain, i represents i-stage amplification, NF=nf1+nf2-1/g1+nf3-1/g1g2+ … … +nfi-1/g1g … Gi-1, and the noise coefficient of the receiving intermediate frequency channel is mainly determined by input loss, the noise coefficient of a preceding stage device and gain, and the contribution of a subsequent stage circuit to the noise coefficient is small and can be ignored. Thus requiring a lower noise figure and a higher gain for the front-end low noise amplifier. The receiving channel adopts a two-stage low-noise amplifier design, so that the contribution of a post-stage circuit after the second-stage low-noise amplifier to noise coefficients can be obviously reduced.
Thirdly, reducing input loss, wherein the input loss is mainly the loss of a connector (the connector is an internal connector), and the insertion loss is 0.1dB; the Qorvo CMD318P3 type low-noise amplifier is selected for low-noise amplification, the working frequency band is 5-9 GHz, the noise coefficient is 1.3dB, the gain is 22dB, the band-pass filter is a dielectric filter, and the insertion loss is 2dB.
And fourthly, designing a mixer, wherein the mixer adopts an MCA1-8LH+ double-balanced mixer of Mini, the working frequency range of radio frequency and local oscillator is 2.8-8GHz, the working requirement of C frequency band is met, the intermediate frequency range is DC-1.25G, and the typical frequency conversion loss is 6dB.
And fifthly, receiving gain design is carried out, the sensitivity of the receiving intermediate frequency channel is better than-95 dBm, the noise power in the 10M bandwidth is-174+10logB+Fn= -102dBm, and the signal power is far greater than the noise power, so that the signal gain is mainly considered. The receiving end of the digital module is an AD9361 chip, the AD9361 chip is provided with about 72dB gain adjustment, the minimum demodulation level of the ADC input signal is about-20 dBm, and therefore, the power of the uplink signal output to the AD9361 is required to be larger than-92 dBm (72dB+20dBm). Considering a certain system allowance, the receiving gain is designed to be 30dB, the minimum input power is-95+30= -65dBm, and the requirement of AD9361 demodulation on signal level can be met. The gain of the receiving link of the radio frequency receiving channel is 33dB, and the gain is more than 30dB, so that the design requirement is met.
And sixthly, designing a receiving intermediate frequency channel, wherein the receiving intermediate frequency channel adopts a four-channel signal single-channel filtering and amplifying mode, so that the frequency spectrum purity and isolation of the signals are ensured. The power divider adopts a Mini SCA-4-10+ type 4-path 0-degree power divider, and the working frequency band is as follows: the insertion loss is less than 7dB at 5-1000 MHz. The intermediate frequency amplifier adopts a BGA2818 amplifier with NXP, the working frequency band DC-2.2G and the gain of 30dB.
Similarly, the transmitting channel provided in the radio frequency module includes: the third band-pass filter T3, the fourth band-pass filter T4, the second amplifier U2, the third amplifier U3, the second mixer H2, the second low-pass filter D2, the multiplexer I, the power amplifier G and the isolator K;
the multi-path transmitting intermediate frequency channels are all connected with a multi-path combiner, wherein each path of transmitting intermediate frequency channel consists of a third band-pass filter, a second amplifier, a second low-pass filter, a second mixer and a fourth band-pass filter which are sequentially connected, the number of the transmitting intermediate frequency channels is the same as that of the receiving intermediate frequency channels, the multi-path combiner is connected with the third amplifier, the third amplifier is connected with a power amplifier, and the power amplifier is connected with an isolator.
The transmitting intermediate frequency channel filters, amplifies and mixes the four paths of intermediate frequency signals sent by the baseband module, and outputs the four paths of intermediate frequency signals to the antenna through the filtering amplification after the four paths of intermediate frequency signals are combined by the combiner.
The transmitting medium frequency channel is designed according to the requirements of technical parameters as follows:
the first step, the received baseband signal is filtered and amplified, and then mixed to produce a transmitting signal;
secondly, designing the radio frequency output power, considering that the power amplifier output is an isolator, the insertion loss is 0.5dB, and the final power amplifier has to select the output P -1 Devices with (1 dB compression point) greater than 31.5dBm, with some margin. The power amplifier selects a Qorvo TGA2706-SM type C wave band 2W power amplifier, and the working frequency band is as follows: 5.5-8.5GHz, output P -1 :32dBm, saturated output power Psat:34dBm, gain 31dB.
And secondly, designing a transmission gain, wherein the digital module adopts AD9361 for transmission, the conventional output power is-5 dBm, and the transmission output power is more than 31.5dBm, so that the transmission channel needs more than 37dB of gain. The intermediate frequency amplifier selects an AD8353 type amplifier of ADI, and the working frequency band is as follows: 1M-2.7 GHz, gain: 19dB, output P -1 ：9dBm。
Thirdly, the frequency mixing design is carried out, the link gain of the frequency mixer is estimated to be 38.5dB, the output power is 32.3dBm, and the index requirement is met.
The application provides a C wave band spaceborne measurement and control transponder, includes: baseband module, radio frequency module. The baseband module is connected with the radio frequency module; the base band module is provided with a plurality of radio frequency chips, the radio frequency chips are communicated by utilizing a primary frequency conversion architecture, the radio frequency chips are divided into two groups, one group of radio frequency chips are connected with a receiving channel arranged in the radio frequency module, the other group of radio frequency chips are arranged in a transmitting channel in the radio frequency module, and all the radio frequency chips are connected with an FPGA arranged in the base band module. The plurality of radio frequency chips can effectively reduce the volume and the power consumption of products, and simultaneously isolate the received signals and the transmitted signals, so that the interference to the received signals and the transmitted signals is avoided, and the integration level of the C-band satellite-borne measurement and control transponder is improved.
On the basis of the above embodiment, as a more preferable embodiment, the radio frequency module further includes: a clock local oscillation circuit;
the clock local oscillation circuit is respectively connected with the first mixer, the second mixer and the baseband module;
wherein, clock local oscillator circuit includes: the clock generator S, the buffer C, the local oscillation receiver Z1, the local oscillation transmitter Z2, the local oscillation driver Z3 and the second demultiplexer F2;
the clock generator is connected with the buffer and used for sending out a clock signal with fixed frequency; the buffer is respectively connected with the local oscillation receiver, the local oscillation transmitter and the baseband module, the local oscillation receiver is connected with the first mixer, the local oscillation transmitter is connected with the local oscillation driver, the local oscillation driver is connected with the second multipath branching unit, and the second multipath branching unit is connected with the second mixer in each path of transmitting intermediate frequency channel. The local clock generated by the clock generator is a 50MHz clock.
The clock local oscillation circuit needs to be designed according to the requirements of technical parameters as follows:
firstly, setting a clock circuit to generate a local 50MHz clock according to the design requirement of a system, and adopting SiT5356 type temperature compensation crystal oscillator of SiTime, wherein the frequency stability is +/-0.1 ppm.
And secondly, designing three clocks through a clock buffer. And the digital module is provided for receiving and transmitting local oscillators and digital modules. The buffer adopts a CDCLVC1103 high-speed clock buffer of TI, and the highest working frequency is: 250MHz.
Thirdly, the design of receiving and transmitting local oscillators is carried out, the receiving and transmitting local oscillators adopt phase-locked local oscillators, the local oscillators adopt RJN series miniaturized frequency sources of Dou Renjian, the frequency range supports 2-21GHz, and the phase noise is less than or equal to-95 dBc/Hz@1KHz.
Fourth, four-way clock design is carried out, and a 4-splitter for transmitting local oscillation also selects an EP4RKU + power splitter. The local oscillator drives a CMD305P3 driving amplifier which selects Qorevo, and the working frequency band is as follows: 6-14GHz, gain: 18dB, output P -1 ：18dBm。
In addition, the radio frequency module further includes: a power supply processing circuit; the power supply processing circuit is connected with the baseband module and is used for stabilizing and filtering the input power supply and providing the power supply for each circuit.
Fig. 3 is a circuit diagram of a power supply processing circuit according to an embodiment of the present application, where, as shown in fig. 3, the power supply processing circuit includes: the DC-DC conversion circuit, the first LDO and the second LDO;
the DC-DC conversion circuit is connected with a power supply arranged on the baseband module and used for converting a voltage value output by the power supply and outputting a first voltage value; the first LDO and the second LDO are connected with the DC-DC conversion circuit and are used for respectively outputting a corresponding second voltage value and a corresponding third voltage value, wherein the first LDO and the second LDO are connected in parallel, and the first voltage value, the second voltage value and the third voltage value are different.
The power supply processing circuit needs to be designed according to the requirements of technical parameters as follows:
in the first step, the front end design, the power supply and distribution of the radio frequency front end module are shown in the figure 4, +12V is externally input, +5.2V and 6V are output after DCDC conversion and are provided for a transmitting power amplifier, +5.2V power supply outputs +3.3V and +5V secondary power supply respectively after LDO linear voltage stabilization for each circuit.
The second part, the internal power supply design, +3.3V power LDO selects ADP124 low dropout voltage regulator of ADI, the input voltage scope: 2.3-5.5V, output current: 500mA. ADM7172 low dropout voltage regulator of ADI is selected as +5V power supply LDO, and the input voltage range is as follows: 2.3-6.5V, output current: 2A. The DCDC selects an LTM4622A type voltage-reducing voltage stabilizer of ADI, and the input voltage range is as follows: 3.6-20V, output voltage range is 1.5-12V, output current: two ways 2A.
Fig. 4 is a schematic block diagram of a phase-locked local oscillator provided in an embodiment of the present application, as shown in fig. 4, a clock generator may be understood as a crystal oscillator (corresponding to the TCXO of fig. 1), where the crystal oscillator obtains an output signal of a radio frequency through a phase detector, a low-pass filter (LP), a voltage-controlled oscillator (VCO), a power division amplifier, a programmable frequency divider, and an attenuation amplifier that are sequentially connected, where a frequency divider is further connected between the phase detector and the power division amplifier, and it should be noted that the attenuation amplifier may be formed by a plurality of chips with attenuation functions and other connected peripheral circuits, and it should be understood that the connection of the peripheral circuits should be simpler and better.
On the basis of the foregoing embodiments, as a more preferred embodiment, fig. 5 is a system structural diagram of a baseband module provided in the embodiment of the present application, as shown in fig. 5, where the baseband module further includes: an anti-surge circuit and EMI; the anti-surge circuit is connected with an external power supply and EMI, and the EMI is connected with a power supply arranged in the baseband module. The baseband module is connected with the radio frequency module through a connector, wherein the connector is an interconnection radio frequency plug-in unit, the plug-in unit is shown as SMP in fig. 5, and the number of plug-in units is 9.
The baseband module needs to be designed according to the requirements of technical parameters as follows:
in the first step, the block diagram of the digital baseband is shown in fig. 5, the digital baseband module realizes down-conversion and sampling of signals of a receiving link through an AD9361, signal receiving, demodulation, modulation and transmission through an FPGA, up-conversion transmission of signals of a transmitting link through the AD9361, remote control and remote measurement data receiving and transmitting through an RS422 receiving and transmitting interface, and monitoring and resetting operation of the FPGA through a watchdog circuit.
And secondly, designing a power supply of the digital baseband, wherein the baseband module introduces primary power bus voltage of +12V from the power supply management module through a power interface, and converts the voltage into a secondary power supply required by the baseband module through DC/DC after passing through an anti-surge circuit and an EMI filter. The power module LTM4644 of ADI company is selected to output 4 secondary power sources, and the power conversion efficiency is not lower than 90%.
It should be noted that, based on the above embodiment, the signal processing procedure of the baseband module is as follows:
according to the requirements of a digital baseband hardware platform, a core device FPGA selects a piece of XC7A100T, and the use requirement of a baseband software algorithm is met through resource budget analysis. Because the selected XC7A100T chip is an SRAM type FPGA, the single event upset resistance is poor, and a watchdog circuit is externally added for secondary monitoring. On the other hand, the method has good effect on eliminating the space single event effect through the power-on and power-off operation. Because the measurement and control transponder has no program reconstruction function, in order to increase the reliability of the FPGA program, the FPGA program is stored with two XQ17V16 chips.
And secondly, the digital baseband module completes the uplink signal receiving function, the uplink signal is amplified and down-converted by the radio frequency module, and then the radio frequency signal of-60 to 0dBm is output to the baseband module, the baseband module receives the RF signal by adopting an AD9361 chip, and a receiving channel of the AD9361 chip adopts a direct frequency conversion architecture and consists of a low-noise amplifier, a mixer, a programmable gain amplifier, a bandwidth variable filter and a high-speed high-precision ADC. The receiving channel has the function of calibration, small noise coefficient and high image rejection performance, and is beneficial to improving the radio frequency performance of the receiving channel.
And thirdly, designing downlink signaling, namely finishing the downlink signaling by a digital baseband module, and using a primary frequency conversion architecture of an AD9361 chip, wherein a transmitting channel of the AD9361 chip consists of a mixer, a programmable gain amplifier, a bandwidth variable filter and a high-speed high-precision DAC. The transmitting channel has the advantages of local oscillator leakage calibration and IQ orthogonal calibration, can well inhibit local oscillator leakage and image interference, and has high clutter suppression degree and excellent radio frequency performance.
In addition, it should be noted that, in order to ensure the accuracy and further improve the reliability of the C-band on-board measurement and control transponder, an RS422 for receiving and transmitting signals, a configuration program for the baseband module, where the configuration program is stored in a programmable read-only memory (PROM), and a watchdog circuit for monitoring whether the C-band on-board measurement and control transponder has a fault, are further provided.
In order to solve the technical problem, the application also provides a satellite-borne measurement and control system which comprises the C-band satellite-borne measurement and control transponder. Wherein, C wave band spaceborne measurement and control transponder includes: baseband module, radio frequency module. The baseband module is connected with the radio frequency module; the base band module is provided with a plurality of radio frequency chips, the radio frequency chips are communicated by utilizing a primary frequency conversion architecture, the radio frequency chips are divided into two groups, one group of radio frequency chips are connected with a receiving channel arranged in the radio frequency module, the other group of radio frequency chips are arranged in a transmitting channel in the radio frequency module, and all the radio frequency chips are connected with an FPGA arranged in the base band module. The plurality of radio frequency chips can effectively reduce the volume and the power consumption of products, and simultaneously isolate the received signals and the transmitted signals, so that the interference to the received signals and the transmitted signals is avoided, and the integration level of the C-band satellite-borne measurement and control transponder is improved.
The C-band satellite-borne measurement and control transponder and the satellite-borne measurement and control system provided by the application are described in detail. In the description, each embodiment is described in a progressive manner, and each embodiment is mainly described by the differences from other embodiments, so that the same similar parts among the embodiments are mutually referred. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section. It should be noted that it would be obvious to those skilled in the art that various improvements and modifications can be made to the present application without departing from the principles of the present application, and such improvements and modifications fall within the scope of the claims of the present application.
It should also be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. A C-band satellite-borne measurement and control transponder, comprising: a baseband module (10) and a radio frequency module (11);
the baseband module (10) is connected with the radio frequency module (11); the base band module (10) is internally provided with a plurality of radio frequency chips, the radio frequency chips are communicated by utilizing a primary frequency conversion framework, the radio frequency chips are divided into two groups, one group of the radio frequency chips are connected with a receiving channel arranged in the radio frequency module (11), the other group of the radio frequency chips are arranged in a transmitting channel arranged in the radio frequency module (11), and all the radio frequency chips are connected with an FPGA arranged in the base band module (10).
2. The C-band on-board measurement and control transponder according to claim 1, characterized in that the receiving channel provided in the radio frequency module (11) comprises: a first low noise amplifier, a second low noise amplifier, a first band-pass filter, a second band-pass filter, a first mixer, a first demultiplexer, a first amplifier, a first low-pass filter;
the first low noise amplifier is connected with the first band pass filter, the first band pass filter is connected with the second low noise amplifier, the second low noise amplifier is connected with the first mixer, the first mixer is connected with the first demultiplexer, the first demultiplexer is connected with multipath receiving intermediate frequency channels, wherein each path of receiving intermediate frequency channel consists of the second band pass filter, the first amplifier and the first low pass filter which are sequentially connected.
3. The C-band on-board measurement and control transponder according to claim 2, characterized in that the transmission channel provided in the radio frequency module (11) comprises: the third band-pass filter, the fourth band-pass filter, the second amplifier, the third amplifier, the second mixer, the second low-pass filter, the multiplexer, the power amplifier and the isolator;
the multichannel transmission intermediate frequency channel all with multichannel combiner is connected, wherein, every way transmission intermediate frequency channel by the order is connected third band-pass filter, second amplifier, second low pass filter, second mixer, fourth band-pass filter constitute, just the quantity of transmission intermediate frequency channel with the receipt intermediate frequency channel is the same, multichannel combiner with the third amplifier is connected, the third amplifier with power amplifier is connected, power amplifier is connected with the isolator.
4. A C-band on-board measurement and control transponder according to claim 3, characterized in that the radio frequency module (11) further comprises: a clock local oscillation circuit;
the clock local oscillation circuit is respectively connected with the first mixer, the second mixer and the baseband module (10);
wherein, the clock local oscillation circuit includes: the device comprises a clock generator, a buffer, a local oscillator receiver, a local oscillator transmitter, a local oscillator driver and a second multipath branching unit;
the clock generator is connected with the buffer and used for sending out a clock signal with fixed frequency; the buffer is respectively connected with the local oscillation receiver, the local oscillation transmitter and the baseband module (10), the local oscillation receiver is connected with the first mixer, the local oscillation transmitter is connected with the local oscillation driver, the local oscillation driver is connected with the second multiplexing splitter, and the second multiplexing splitter is connected with the second mixer in each path of transmission intermediate frequency channel.
5. The C-band on-board measurement and control transponder according to claim 1, characterized in that the radio frequency module (11) further comprises: a power supply processing circuit;
the power supply processing circuit is connected with the baseband module (10);
wherein the power processing circuit includes: the DC-DC conversion circuit, the first LDO and the second LDO;
the DC-DC conversion circuit is connected with a power supply arranged on the baseband module (10) and used for converting a voltage value output by the power supply and outputting a first voltage value; the first LDO and the second LDO are connected with the DC-DC conversion circuit and are used for respectively outputting a corresponding second voltage value and a corresponding third voltage value, wherein the first LDO and the second LDO are connected in parallel, and the first voltage value, the second voltage value and the third voltage value are different.
6. The C-band on-board measurement and control transponder of claim 5, wherein the baseband module (10) further comprises: an anti-surge circuit and EMI;
the anti-surge circuit is connected with an external power supply and the EMI, and the EMI is connected with the power supply arranged inside the baseband module (10).
7. The C-band on-board measurement and control transponder according to claim 1, wherein the FPGA is comprised of at least two XC7a100T chips, at least one of the XC7a100T chips being connected to a watchdog circuit.
8. The C-band on-board measurement and control transponder of claim 1, wherein 8 of the radio frequency chips are provided and the radio frequency chips are AD9361 chips.
9. The C-band on-board measurement and control transponder according to claim 1, characterized in that the baseband module (10) is connected to the radio frequency module (11) by a connector, wherein the connector is an interconnected radio frequency card.
10. The utility model provides a satellite-borne measurement and control system which characterized in that includes: a C-band on-board measurement and control transponder according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310033052.8A CN116054915A (en) | 2023-01-10 | 2023-01-10 | C-band spaceborne measurement and control transponder and spaceborne measurement and control system |
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| CN202310033052.8A CN116054915A (en) | 2023-01-10 | 2023-01-10 | C-band spaceborne measurement and control transponder and spaceborne measurement and control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117833996A (en) * | 2024-02-28 | 2024-04-05 | 长光卫星技术股份有限公司 | Relay measurement and control transponder master control system, method, equipment and medium based on SOC FPGA |
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2023
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117833996A (en) * | 2024-02-28 | 2024-04-05 | 长光卫星技术股份有限公司 | Relay measurement and control transponder master control system, method, equipment and medium based on SOC FPGA |
| CN117833996B (en) * | 2024-02-28 | 2024-05-31 | 长光卫星技术股份有限公司 | Relay measurement and control transponder master control system, method, equipment and medium based on SOC FPGA |
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