CN106774106A - Embedded satellite monitoring platform - Google Patents
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- H—ELECTRICITY
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- 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
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
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Abstract
The present invention relates to a kind of embedded satellite monitoring platform.Specifically include：Arm processor, is controlled for the operation to the embedded satellite monitoring platform；The field programmable gate array being connected with arm processor communication, is demodulated, and treatment is modulated to upward signal for the telemetered signal and/or distance measuring signal to receiving；The analogue transmission circuitry module being connected with arm processor communication, for sending the analog output signal corresponding with the digital output signal of field programmable gate array generation；The analog acquisition circuit module being connected with arm processor communication, the analog input signal of the embedded satellite monitoring platform is sent to for receiving, and send the field programmable gate array to.It uses arm processor to be combined with FPGA, it is ensured that while monitoring platform performance, makes functions compacter, reduces the overall volume of monitoring platform, strengthens the mobility and operability of monitoring platform.
Description
Technical Field
The invention belongs to the technical field of spaceflight, and particularly relates to an embedded satellite measurement and control platform.
Background
The spacecraft launch density increased year by year, only 2015, and completed 86 launch tasks globally. 259 spacecraft are launched in total, wherein the launch frequency in China is 19, the number of carried spacecrafts is 44, and the launch frequency and the number of launched spacecrafts create the highest history. With the increasing of the quantity of launching tasks, the space measurement and control tasks are heavier and heavier, the demand for ground measurement and control equipment is larger and higher, and the requirements are higher and higher.
The development of the aerospace technology, measurement and control are subject to three system types of dispersion type, unified carrier measurement and control type and spread spectrum unified measurement and control type, and currently, the unified carrier measurement and control type and the spread spectrum unified measurement and control type are mainly used. The unified carrier measurement and control mainly integrates the functions of tracking measurement and control, remote measurement and the like of the aerospace craft. The carrier wave is mainly used for simultaneously completing various functions of measurement and control, speed measurement, angle measurement, remote control, remote measurement, voice and the like, and the unified measurement and control specifically refers to the unification of carrier wave channels. At the transmitting end, the baseband signals are modulated onto respective subcarriers, then the subcarrier signals are added together and modulated onto a carrier, and then the signals are transmitted through a uniform channel. At the receiving end, firstly, the demodulation of the carrier signal is completed, then, each path of demodulated subcarrier signal is sent to the corresponding baseband equipment for signal processing, and the corresponding modulation signal is obtained after the demodulation is completed. The distance measurement is carried out by phase modulating carrier wave by a group of sine wave distance measurement tones, sending out an uplink distance measurement tone by the ground, adjusting a corresponding forwarding ratio after extracting the uplink distance measurement tone by a transponder, making the distance measurement tone on a downlink carrier wave for forwarding, copying a return distance measurement tone signal by a phase-locked loop after capturing a distance measurement tone signal by the ground station, calculating the round-trip time of the signal from the ground station to the satellite by comparing the phase difference between the downlink distance measurement tone and the uplink distance measurement tone received by the ground, and further calculating the distance between the downlink distance measurement tone and the uplink distance measurement tone.
The existing measurement and control equipment and the measurement and control platform are large in size, heavy in weight and inconvenient to use.
Disclosure of Invention
Therefore, it is necessary to provide an embedded satellite measurement and control platform beneficial to miniaturization aiming at the problem of large volume of the existing satellite measurement and control platform.
The embedded satellite measurement and control platform of one embodiment includes:
the ARM processor is used for controlling the operation of the embedded satellite measurement and control platform;
the field programmable gate array is in communication connection with the ARM processor and is used for demodulating the received telemetering signals and/or ranging signals and modulating uplink signals;
the analog transmitting circuit module is in communication connection with the ARM processor and is used for transmitting analog output signals corresponding to the digital output signals generated by the field programmable gate array;
and the analog acquisition circuit module is in communication connection with the ARM processor and is used for receiving and transmitting analog input signals to the embedded satellite measurement and control platform and transmitting the analog input signals to the field programmable gate array.
In one embodiment of the embedded satellite measurement and control platform, the embedded satellite measurement and control platform further comprises a clock management module, a time code circuit module, a serial port circuit and a memory which are electrically connected with the ARM processor; wherein,
the clock management module is used for receiving an externally input clock signal and transmitting the clock signal to the ARM processor; the time code circuit module is used for receiving an externally input time code and transmitting the time code to the ARM processor; the serial port circuit is used for establishing connection with an external computer terminal; the memory is used for storing data.
In one embodiment of the embedded satellite measurement and control platform, the digital B code and the analog B code received by the time code circuit module are input through the same input interface, and the received digital B code is modulated to obtain the corresponding B code.
In one embodiment of the embedded satellite measurement and control platform, the embedded satellite measurement and control platform further comprises a TCP/IP network interface circuit in communication connection with the ARM processor, and the embedded satellite measurement and control platform is communicated with the Internet.
In one embodiment of the embedded satellite measurement and control platform, the embedded satellite measurement and control platform further comprises a shell, and the ARM processor, the analog transmitting circuit module, the analog acquisition circuit module and the programmable logic gate array are all arranged inside the shell.
In one embodiment of the embedded satellite measurement and control platform, the analog transmitting circuit module and the analog acquisition circuit module are respectively arranged in an independent packaging box, and the ARM processor and the programmable logic gate array are arranged in an independent packaging box; the analog transmitting circuit module and the analog collecting circuit module are respectively realized by a PCB, and the ARM processor and the programmable logic gate array are arranged on the PCB.
In one embodiment of the embedded satellite measurement and control platform, the packaging box is made of metal.
In one embodiment of the embedded satellite measurement and control platform, the embedded satellite measurement and control platform further comprises a work indicator light connected with the ARM processor.
In one embodiment of the embedded satellite measurement and control platform, the field programmable gate array demodulates the received telemetry signals and/or ranging signals by:
carrying out frequency conversion processing on the received carrier signals corresponding to the telemetering signals and/or the ranging signals to obtain intermediate frequency modulation signals;
performing band-pass sampling on the intermediate frequency modulation signal through analog-to-digital conversion, and outputting a digital intermediate frequency signal;
carrying out carrier capture on the digital intermediate frequency signal through fast Fourier transform, and tracking a carrier;
and demodulating the captured digital intermediate frequency signal to obtain a demodulation signal corresponding to the telemetry signal and/or the ranging signal.
In one embodiment of the embedded satellite measurement and control platform, when the field programmable gate array is used for carrying out band-pass sampling on the intermediate frequency modulation signal, the low-pass filtering and the down-sampling of the processed signal are realized by adopting an integral zero clearing mode.
In an embodiment of one of the embedded satellite measurement and control platforms, the performing carrier acquisition on the digital intermediate frequency signal through fast fourier transform includes:
and when the error of the capture system captured by the carrier exceeds a preset error value, improving the resolution in the fast Fourier transform according to a preset resolution adjustment rate, and/or reducing the carrier capture duration according to a preset carrier capture duration adjustment rate.
In one embodiment of the embedded satellite measurement and control platform, the method further includes:
the video acquisition module is in communication connection with the ARM processor and is used for receiving video data transmitted to the embedded satellite measurement and control platform;
and the video transmitting module is in communication connection with the ARM processor and is used for transmitting video data to a satellite.
The invention has the advantages of
By adopting the technical scheme, the invention can at least obtain the following technical effects:
the ARM processor is combined with the FPGA, so that functions of all parts are more compact while the performance of the measurement and control platform is guaranteed, the overall size of the measurement and control platform is reduced, and the mobility and operability of the measurement and control platform are enhanced. Furthermore, all functions of the measurement and control platform are respectively and independently packaged in a functional module mode and then are uniformly arranged in a case. The modules are connected through cables, subsequent maintenance is facilitated, and the independent packaging structure plays a better role in protecting devices inside the modules. Furthermore, the resolution in the fast Fourier transform is improved or the capture time is reduced to reduce the capture system error and improve the signal capture frequency and the search precision.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
Fig. 1 is a schematic diagram illustrating a configuration of an embedded satellite measurement and control platform according to this embodiment;
fig. 2 is a schematic structural diagram of a housing of the embedded satellite measurement and control platform according to this embodiment;
FIG. 3 is a schematic diagram of the FPGA algorithm according to the present embodiment;
FIG. 4 is a block diagram of a sounding and ranging system according to the present embodiment;
fig. 5 is a block diagram of a structure for testing an embedded satellite measurement and control platform according to this embodiment.
Detailed Description
The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of various embodiments of the disclosure as defined by the claims and their equivalents. The following description includes various specific details to aid understanding, but these details are to be regarded as illustrative only. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the various embodiments described herein can be made without departing from the scope and spirit of the present disclosure. In addition, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.
The terms and words used in the following description and claims are not limited to literature meanings, but are used only by the inventor to enable the disclosure to be clearly and consistently understood. Accordingly, it should be apparent to those skilled in the art that the following descriptions of the various embodiments of the present disclosure are provided for illustration only and not for the purpose of limiting the disclosure as defined by the appended claims and their equivalents.
It is to be understood that the singular forms also include the plural reference unless the context clearly dictates otherwise. Thus, for example, reference to a "component surface" includes reference to one or more such surfaces.
Fig. 1 is a schematic configuration diagram of an embedded satellite measurement and control platform according to this embodiment.
Referring to fig. 1, the embedded satellite measurement and control platform of the present embodiment includes an ARM processor 100, a Field-Programmable Gate Array (FPGA) 200, an analog transmitting circuit module 300, and an analog collecting circuit module 400. The ARM processor 100 is a control component of the measurement and control platform, and manages and controls the operation of each functional module, that is, controls the operation of the embedded satellite measurement and control platform. Therefore, other functional modules in the embedded satellite measurement and control platform of this embodiment are connected to the ARM processor 100. Including communication connections and electrical connections.
Specifically, in this embodiment, the hardware portion is managed and controlled by the ARM processor 100, and besides, the FPGA is used to implement specific functions of software, process and analyze received data, and perform carrier modulation and other processing on data to be sent to the satellite.
Wherein processing the received data includes demodulating the received telemetry and/or ranging signals. The processing of the transmitted data includes modulating the uplink signal. The uplink signal and the communication signal to be transmitted to the satellite from the ground. In this embodiment, the measurement and control signals to be sent to the satellite are modulated in a uniform carrier manner, and the modulated measurement and control signals are transmitted to the analog transmitting circuit module in communication connection with the ARM processor, and are finally sent out through the frequency transceiving interface of the embedded satellite measurement and control platform of this embodiment. Therefore, the analog transmitter circuit module 300 is used to transmit the analog output signal corresponding to the digital output signal generated by the fpga 200.
Correspondingly, in order to assist the FPGA in analyzing and processing the received data, the embedded satellite measurement and control platform of this embodiment further includes an analog acquisition circuit module 400 in communication with the ARM processor 100, and configured to receive, acquire, and transmit an analog input signal to the embedded satellite measurement and control platform, and transmit the analog input signal to the field programmable gate array 200, so as to process the received data by using a preset program in the FPGA.
In the circuit connection setting process, the analog transmitting circuit module and the analog acquisition circuit module can be connected with the ARM processor 100 and also connected with the FPGA functional module for realizing software calculation in a communication manner, so that the transmission of quickly receiving and sending data is realized.
The embedded satellite measurement and control platform of this embodiment integrates ARM's control function and FPGA's operational capability on hardware platform, realizes the miniaturization of measurement and control equipment, integrates, and the whole small, light in weight of device, convenient to carry. And the main stream ARM processor and FPGA platform are adopted, so that the overall cost is low.
In one embodiment, in addition to the ARM processor, the analog transmitting circuit module, the analog collecting circuit module and the field programmable gate circuit in the above embodiments, the device further includes a clock management module, a time code circuit module, a serial port circuit and a memory electrically connected to the ARM processor. The clock management module is used for receiving an externally input clock signal and transmitting the clock signal to the ARM processor; the time code circuit module is used for receiving an externally input time code and transmitting the time code to the ARM processor; the serial port circuit is used for establishing connection with an external computer terminal; the memory is used for storing data.
As an implementation, the entire satellite measurement and control platform, or the control portion of the platform, may operate under the LinNux system.
In the design process of the embedded satellite measurement and control platform provided by the embodiment of the invention, the following steps can be carried out: firstly, the overall design of the satellite measurement and control platform is carried out, including the overall structure layout, the covering functions and the like. And secondly, designing hardware design of the satellite measurement and control platform, wherein the hardware design comprises selection of models of ARM processors, selection of FPGA functional models, connection among all parts, design of peripheral circuits and the like.
Specifically, in the design of the ARM processor, an embedded microprocessor with high performance of ARM company can be selected, the embedded microprocessor operates at 400MHz, the processor operates in Linnux operating system, and a TCP/IP protocol stack is required to be provided, so that the requirements of the system on operation and control can be met, and functional expansion and secondary development are required to be supported. Furthermore, the ARM processor and the peripheral circuit are composed of a local bus, a memory circuit, an RS232 serial port circuit, a TCP/IP network interface circuit, a buzzer circuit, a fan control circuit and the like. Those skilled in the art can understand that the design of the peripheral circuit of the ARM processor needs to be set according to the function module or the function possessed by the embedded satellite measurement and control platform. If a working indicator lamp corresponding to function display is arranged on the embedded satellite measurement and control platform, an indicator lamp circuit corresponding to the working indicator lamp is arranged as a part of a peripheral circuit, and the working indicator lamp is electrically connected with the ARM processor through the arranged corresponding peripheral circuit.
In the peripheral circuit which is arranged in an auxiliary manner, for example, the buzzer circuit is used for connecting and driving the buzzer, when the ARM processor which controls the operation of the embedded satellite measurement and control platform breaks down in the operation of the system or runs a certain specific function, the buzzer can be driven to make a sound through the buzzer circuit so as to warn. Of course, other forms of warning devices may be used, and a circuit arrangement may be provided in conjunction with the ARM processor.
In one embodiment, the memory circuit is connected with the memory mainly comprising DDR2 storage and NandFlash storage. Therefore, the ARM processor provides task management service, alarms aiming at the abnormity in the measurement and control task and can automatically store the received data. And the serial port circuit uses RS232 serial port, and the RS232 serial port can use MAX3232 level conversion chip in addition, is used for ARM debugging interface's receiving and transmitting signal level and matches with computer serial port level.
And two hundred mega Ethernet PHY chips DM916A in a TCP/IP network interface circuit in the peripheral circuit realize a double-network port, so that the pressure caused by the transmission of a large amount of telemetering data can be relieved.
In this embodiment, the signal acquisition module receives an analog signal with a frequency of 70MHz and a bandwidth of 10MHz, and outputs a digital signal to the FPGA implementing the software function after bandpass filtering, power adjustment and analog-to-digital conversion. The signal transmitting module transmits an analog signal with the frequency of 70MHz and the bandwidth of 10Hz, and outputs the analog signal after analog-to-digital conversion, band-pass filtering and power adjustment.
The clock management module integrates a VCO (voltage controlled oscillator) and a phase-locked loop in the clock management module, supports two paths of external reference clock input and 12 paths of differential clock output, and provides a serial port as an internal frequency divider and various parameter configuration interfaces. In the time code circuit module, the hour period of the B code is 1 second, and includes 100 code elements, the code element rate is 100/s, the hour rate is 1pps, and the B (dc) code (digital code) is modulated to obtain a B (ac) code (analog code), that is, the received digital B code is modulated to obtain a corresponding B code. This enables a significant compression of the bandwidth, the band of the B (AC) code being 100Hz-3 KHz. It should be noted that, in the present embodiment, the b (dc) code and the b (ac) code are input from the same input interface. The design reduces the input/output interface of the whole embedded satellite measurement and control platform panel, can enable the equipment to be more integrated, and meets the digital requirement of a clock circuit.
In terms of hardware, for the selection of the FPGA, in order to realize a better operation function, it is preferable to select a chip with a higher operation speed and lower power consumption.
Furthermore, in order to realize miniaturization and integration of the satellite measurement and control platform, in one embodiment, all hardware devices are modularly installed in one shell, for example, in one common chassis. The embedded satellite measurement and control platform of the embodiment is shown in fig. 2. In this embodiment, the analog transmitting circuit module 300 and the analog collecting circuit module 400 are implemented by a PCB respectively. The ARM processor 100 and the FPGA implementing the software data processing function are integrated on one PCB to form the digital baseband processing module 010. And each PCB is independently packaged and is respectively arranged in a packaging box. As an implementation mode, the packaging box can be made of metal. Therefore, the electromagnetic interference can be reduced while preventing particles such as dust in the outside air from entering the box body.
Referring to fig. 2, in the present embodiment, in addition to the aforementioned analog acquisition circuit module 400, analog transmission circuit module 300 and digital baseband processing module 010, a power module 500 for supplying power to each functional unit and module in the chassis is further provided in the chassis. The power module 500 has a function of converting a standard power supply voltage inputted from the outside into a rated voltage required by each functional module inside the chassis, and supplying power to each functional module. Of course, in order to provide voltage input to the power module, a power interface 700 is provided on the chassis housing for connecting an external power source. And in order to ensure the safety, the case is also provided with a power switch 600 connected with the power module, and the power switch is used for connecting or disconnecting the power supply of the whole embedded satellite measurement and control platform.
Preferably, as an implementation mode, in order to meet the mobile use requirement, an energy storage battery is further arranged in the power module, and is used for storing electric energy, so that the satellite measurement and control system can be ensured to work when no external power supply is supplied.
Referring to fig. 2, 4 frequency transceiving interfaces 900, namely a first frequency transceiving interface 901, a second frequency transceiving interface 902, a third frequency transceiving interface 903 and a fourth frequency transceiving interface 904, are arranged at positions close to the chassis housing (through holes are arranged at corresponding positions of the chassis housing); meanwhile, a time code input interface 1000, a clock input interface 1100, a clock output interface 1200, a matrix connector 1300 and two network ports are arranged near the shell and correspond to 1400 and 1500 respectively.
Specifically, the frequency transceiving interface is used for inputting and outputting signals between the measurement and control platform and the outside (satellite), namely carrier signals. And the design of the network port can enable data related to the measurement and control platform to be transmitted through a network, so that the measurement and control mode is changed from manual operation equipment to remote operation equipment through a TCP/IP network, the convenience of equipment control is greatly improved, and the network port is in line with the major trend of the development of the current network information technology.
In another embodiment, the embedded satellite measurement and control platform includes, in addition to the ARM processor, the analog acquisition circuit module, the analog transmission circuit module, and the FPGA circuit, a video acquisition module and a video transmission module communicatively connected to the ARM processor are further provided in terms of hardware. The video acquisition module is used for receiving video data transmitted to the embedded satellite measurement and control platform, and the video transmission data is transmitted to the satellite through the measurement and control platform. Since the video data is different from the control signal in terms of processing manner and data amount, the video transceiver module is distinguished from the aforementioned analog transceiver circuit module (analog acquisition circuit module and analog transmission circuit module) in this embodiment. Therefore, the timeliness and the accuracy of sending the measurement and control signals can be ensured while the video signals or the video data are processed conveniently. The efficiency and the performance of the measurement and control platform are ensured.
The following describes the software performance and implementation of the measurement and control platform in detail.
In the embodiment, the development of software modules is realized by using the FPGA, and the development comprises the acquisition and tracking of the download signals in the unified measurement and control carrier type, the demodulation of the telemetering signals and the demodulation of the ranging signals. The algorithm in the FPGA is mainly designed in an ISE development environment, and the function of the bright spot equipment is mainly realized in the algorithm: a digital transmitter and a digital receiver. The digital transmitter is used for completing the digital modulation of the uplink signal; the digital receiver itself is used to perform demodulation of the downlink signal (received signal), which includes demodulation of the telemetry signal and processing of the ranging signal. The software algorithm comprises the following steps:
(1) the carrier signal is captured by a fast fourier transform. The method comprises the steps of utilizing a traditional conversion algorithm to mainly carry out frequency conversion processing on a carrier signal corresponding to a received telemetering signal or ranging signal through a front-end radio frequency module to obtain an intermediate frequency modulation signal. The obtained intermediate frequency modulation signal is subjected to analog-to-digital conversion and then subjected to band-pass sampling, and a digital intermediate frequency signal is output. In the scheme, low-pass filtering and down-sampling are replaced by integral zero clearing, and the error of a capture system is reduced by improving the resolution in fast Fourier transform or reducing the capture time, so that the capture frequency and the search precision are improved. Specifically, a preset resolution adjustment rate and a preset carrier capture duration adjustment rate may be set in advance. When the error of the capture system captured by the carrier exceeds a preset error value, the resolution in the fast Fourier transform is improved according to the preset resolution adjustment rate, and/or the carrier capture duration is reduced according to the preset carrier capture duration adjustment rate. Therefore, the acquisition frequency and the search accuracy of the carrier signal are improved more effectively.
And subsequently, demodulating the captured digital intermediate frequency signal to obtain a demodulation signal corresponding to the telemetry signal and/or the ranging signal. The method comprises the following steps:
(2) demodulation of the phase-modulated signal is completed. After the initial capture of the carrier is completed, the system enters a carrier tracking link, the embedded measurement and control equipment (platform) adopts a phase-locked loop to track the carrier, and the phase modulation signal can be well demodulated only when the phase-locked loop is required to be set to have low signal-to-noise ratio.
(3) And (5) implementing a sounding and ranging algorithm. A group of sine waves are used and modulated onto a carrier wave as a baseband signal to be transmitted, the sine waves are transmitted to a ground station through a satellite transponder and are demodulated after being received, a received sounding signal has a delay relative to a transmitting signal, and the delay has a certain linear relation with the distance between a transmitting end and a receiving end, namely corresponding data can be calculated according to the relation.
Referring to fig. 3, the digital transmitter and digital receiver functions implemented using FPGAs in one embodiment are as follows:
for a digital transmitter, the telemetry signal generation module within the digital transmitter can generate the desired telemetry signal and the ranging signal generation module can generate the ranging signal. No matter the signal is a telemetering signal or a ranging signal, a carrier signal is generated after FM/PM modulation, and the carrier signal is sent to the analog transmitting circuit module after D/A conversion and is sent out. Referring to fig. 3, the structure (process flow) of the digital receiver is complicated compared to the digital transmitter. The method comprises the steps of carrying out band-pass filter filtering on signals received by an A/D interface to obtain intermediate frequency signals, carrying out analog-to-digital conversion, then carrying out digital down-conversion, filtering by a band-pass filter, carrying out down-sampling to obtain processed digital intermediate frequency signals, carrying out carrier capture and carrier tracking on the processed digital intermediate frequency signals, carrying out FM/PM demodulation to demodulate specific received telemetering signals or ranging signals, and extracting the demodulated signals by adopting a separation filter to respectively obtain the telemetering signals or the ranging signals. If the telemetering signal is separated, the telemetering signal processing module is used for operation processing to obtain a telemetering result; and if the ranging signal is separated, processing by using a ranging signal processing module to obtain distance data.
Fig. 4 is a process of implementing a ranging function of a ranging unit (including a ranging signal generating module and a ranging signal processing module) of a satellite measurement and control platform according to an embodiment.
Firstly, the ranging unit generates ranging tones, the ranging tones are transmitted to an up-converter after being FM modulated, and carrier signals after being frequency-converted by the up-converter are transmitted to a receiver of a satellite through an uplink. And secondly, the telemetry unit in the satellite controls multiple ranging tones to be forwarded and finally transmits the ranging tones to the outside through the transmitter. And thirdly, transmitting the signals forwarded by the ranging tones through a downlink to the ground by the satellite, and receiving the signals by the measurement and control platform. The received signal is processed by a down converter, and then is subjected to carrier capture and PM tracking demodulation. The signal captured by the carrier wave is combined with the data separated by the main tone and the transmission tone after the signal is subjected to Doppler assistance and PM tracking demodulation in the ranging unit for secondary demodulation, finally phase tracking is realized in the ranging unit, and finally the ranging unit performs smoothing processing on the processed data to obtain a ranging result.
In addition, the design process of the embedded satellite measurement and control platform also comprises a test part for the platform. The test process of the equipment (platform) is completed by using a frequency spectrograph, an oscilloscope, a PC (personal computer), a signal source and an embedded satellite measurement and control platform of any example.
In the test process, the connection relationship among the PC terminal, the embedded satellite measurement and control platform, the signal source, the oscilloscope and the frequency spectrograph is shown in fig. 5.
Referring to fig. 5, the signal source can simulate the intermediate frequency carrier signal generated by the satellite, the spectrometer is used for observing the intermediate frequency signal output by the device, and the oscilloscope observes the device video transceiving signal. The design mainly performs key tests on the input/output frequency range and the input/output power dynamic range of the embedded measurement and control equipment under the same carrier measurement and control type. The method mainly comprises the following steps:
(1) input/output of intermediate frequency signals; the PC loads a test program, and the input/output intermediate frequency can be set within the range of 65MHz to 75MHz by stepping 1 KHz. The intermediate frequency output signal is connected to a spectrometer to observe a spectrogram of the signal, which can be observed to the frequency of the output signal. And generating a signal with a frequency range of 65 MHz-75 MHz by using a signal source to an intermediate frequency input interface of the embedded measurement and control equipment, and observing the receiving state of the equipment. The input and output of the test equipment can work normally in the frequency range of 65MHz to 75 MHz.
(2) Input/output power dynamic range; and loading a test program through the PC, configuring corresponding power output, and observing the output power of the signal by the output signal through the frequency spectrograph. Through testing, the transmitting power is basically equal to a design value, the sensitivity of a tested receiver is better than-90 dBm, and the design dynamic range is-90 dBm-0 dBm.
(3) Testing the separation between channels; the signal source is used for generating high power to be output to the intermediate frequency input interface of the embedded measurement and control equipment, and the receiving state of other input channels of the measurement and control equipment is detected to check the input isolation condition. The embedded measurement and control equipment outputs a path of high-power signal, and the other output is connected to the frequency spectrograph for observing the power of the output signal. The test has little influence on other channels when large signals are transmitted in the input and output channels, and the isolation requirement in the test task is met.
It should be noted that the various embodiments of the present disclosure as described above generally relate to the processing of input data and the generation of output data to some extent. This input data processing and output data generation may be implemented in hardware or software in combination with hardware. For example, certain electronic components may be employed in a mobile device or similar or related circuitry for implementing the functions associated with the various embodiments of the present disclosure as described above. Alternatively, one or more processors operating in accordance with stored instructions may implement the functions associated with the various embodiments of the present disclosure as described above. If so, it is within the scope of the present disclosure that these instructions may be stored on one or more non-transitory processor-readable media. Examples of the processor-readable medium include read-only memory (ROM), random-access memory (RAM), CD-ROMs, magnetic tapes, floppy disks, and optical data storage devices. In addition, functional computer programs, instructions, and instruction segments for implementing the present disclosure can be easily construed by programmers skilled in the art to which the present disclosure pertains.
While the disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims and their equivalents.
Claims (11)
1. An embedded satellite measurement and control platform, comprising:
the ARM processor is used for controlling the operation of the embedded satellite measurement and control platform;
the field programmable gate array is in communication connection with the ARM processor and is used for demodulating the received telemetering signals and/or ranging signals and modulating uplink signals;
the analog transmitting circuit module is in communication connection with the ARM processor and is used for transmitting analog output signals corresponding to the digital output signals generated by the field programmable gate array;
and the analog acquisition circuit module is in communication connection with the ARM processor and is used for receiving and transmitting analog input signals to the embedded satellite measurement and control platform and transmitting the analog input signals to the field programmable gate array.
2. The embedded satellite measurement and control platform of claim 1, further comprising a clock management module, a time code circuit module, a serial port circuit and a memory electrically connected to the ARM processor; wherein:
the clock management module is used for receiving an externally input clock signal and transmitting the clock signal to the ARM processor; the time code circuit module is used for receiving an externally input time code and transmitting the time code to the ARM processor; the serial port circuit is used for establishing connection with an external computer terminal; the memory is used for storing data.
3. The embedded satellite measurement and control platform of claim 2, wherein the digital B code and the analog B code received by the time code circuit module are input through the same input interface, and the received digital B code is modulated to obtain the corresponding B code.
4. The embedded satellite measurement and control platform of claim 1, further comprising a TCP/IP network interface circuit communicatively connected to the ARM processor, for communicating the embedded satellite measurement and control platform with the internet.
5. The embedded satellite measurement and control platform of claim 1, further comprising a housing, wherein the ARM processor, the analog transmission circuit module, the analog acquisition circuit module, and the programmable gate array are all disposed inside the housing; wherein,
the analog transmitting circuit module and the analog collecting circuit module are respectively arranged in an independent packaging box, and the ARM processor and the programmable logic gate array are arranged in an independent packaging box; the analog transmitting circuit module and the analog collecting circuit module are respectively realized by a PCB, and the ARM processor and the programmable logic gate array are arranged on the PCB.
6. The embedded satellite measurement and control platform of claim 5, wherein the enclosure is made of metal.
7. The embedded satellite measurement and control platform of any one of claims 1-6, further comprising a work indicator light connected to the ARM processor.
8. The embedded satellite measurement and control platform of claim 1, wherein the field programmable gate array demodulates the received telemetry and/or ranging signals by:
carrying out frequency conversion processing on the received carrier signals corresponding to the telemetering signals and/or the ranging signals to obtain intermediate frequency modulation signals;
performing band-pass sampling on the intermediate frequency modulation signal through analog-to-digital conversion, and outputting a digital intermediate frequency signal;
carrying out carrier capture on the digital intermediate frequency signal through fast Fourier transform, and tracking a carrier;
and demodulating the captured digital intermediate frequency signal to obtain a demodulation signal corresponding to the telemetry signal and/or the ranging signal.
9. The embedded satellite measurement and control platform of claim 8, wherein when the field programmable gate array is used to perform band-pass sampling on the intermediate frequency modulation signal, low-pass filtering and down-sampling on the processed signal are implemented in an integral zero clearing manner.
10. The embedded satellite measurement and control platform of claim 8, wherein the carrier acquisition of the digital intermediate frequency signal by fast fourier transform comprises:
and when the error of the capture system captured by the carrier exceeds a preset error value, improving the resolution in the fast Fourier transform according to a preset resolution adjustment rate, and/or reducing the carrier capture duration according to a preset carrier capture duration adjustment rate.
11. The embedded satellite measurement and control platform of claim 1, further comprising:
the video acquisition module is in communication connection with the ARM processor and is used for receiving video data transmitted to the embedded satellite measurement and control platform;
and the video transmitting module is in communication connection with the ARM processor and is used for transmitting video data to a satellite.
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