CN114513264A - Analog data generation device and method for remote sensing satellite - Google Patents
Analog data generation device and method for remote sensing satellite Download PDFInfo
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Abstract
The invention relates to the technical field of instrument testing, in particular to a device and a method for generating simulation data of a remote sensing satellite. The method specifically comprises the following steps: the input end of the interface module is connected with an external interface; the input end of the control module is connected with the first output end of the interface module; the input end of the storage module is connected with the second output end of the interface module; the first input end of the data selection module is connected with the output end of the control module, and the second input end of the data selection module is connected with the output end of the storage module; the data selection module is used for selectively connecting the output ends of the data generation modules. Therefore, the simulation data of different data types can be generated according to different application scenes, so that the method is suitable for different test scenes, the efficiency of test work is improved, and the test cost is reduced.
Description
Technical Field
The invention relates to the technical field of instrument testing, in particular to a device and a method for generating simulation data of a remote sensing satellite.
Background
The Chinese remote sensing satellite ground station provides satellite remote sensing data and space remote sensing information service for the whole country, and is a national-level civil multi-resource satellite receiving and processing infrastructure. This relates to the use of antenna devices and the use of data reception demodulation functions. In order to ensure that the satellite ground receiving station can correctly acquire data downloaded by marine satellite remote sensing, functional verification and performance test are required to be carried out on related equipment before the related equipment is put into use, and regular maintenance is also required after the related equipment is put into use. But is limited by the transit time of the satellite, if the real satellite data is received as a signal source for testing, the efficiency is low and the cost is high. Therefore, a device capable of generating remote sensing satellite simulation data for testing and maintenance is needed, so that the efficiency of testing work is improved, and the testing cost is reduced.
Disclosure of Invention
The invention provides a device and a method for generating remote sensing satellite simulation data, which can generate simulation data of different data types so as to be suitable for different test scenes.
According to an aspect of the present invention, there is provided an apparatus for generating simulation data of a remote sensing satellite, comprising:
the input end of the interface module is connected with an external interface;
the input end of the control module is connected with the first output end of the interface module;
the input end of the storage module is connected with the second output end of the interface module;
a first input end of the data selection module is connected with an output end of the control module, and a second input end of the data selection module is connected with an output end of the storage module;
the output end of the data selection module can be selectively connected with the input ends of the data generation modules.
Optionally, the method further includes: the input end of the data transmission module is connected with the output ends of the data generation modules and is configured to transmit the analog data to a user terminal.
Optionally, the data generating modules specifically include:
the modulation module is used for connecting a first output end of the data selection module with an input end of the modulation module when the data transmission module transmits first-class analog data to the user terminal;
the cache flow control module is used for connecting a second output end of the data selection module with an input end of the cache flow control module when the data sending module sends the second type of analog data to the user terminal;
the frame data generating module is used for connecting a third output end of the data selecting module with the frame data generating module when the data sending module sends third-type analog data to the user terminal;
and a first input end of the coding module is connected with the output end of the cache flow control module, and a second input end of the coding module is connected with the output end of the frame data generating module.
Optionally, the storage module performs read-write operation on the MSATA solid state disk to store and read data, performs backpressure control by monitoring the remaining storage space of the FIFO, stops reading data when the remaining storage space of the FIFO is smaller than a preset storage capacity, and performs data write-in when the remaining storage space of the FIFO is not smaller than the preset storage capacity.
Optionally, when the data selection module is connected to the cache flow control module, the data selection module retrieves the second analog data from the storage module and transmits the second analog data to the modulation module through the cache flow control module and the encoding module, and the cache flow control module controls a data transmission rate by feeding back a backpressure indication signal to the data selection module:
when the cache data volume Z in the cache flow control module is greater than the backpressure indication threshold upper limit X, the data selection module stops reading data and does not input the data to the cache flow control module any more, wherein X-B-C n represents the total cache capacity of the cache flow control module, n represents the frame number of the backpressure indication signal in the transmission process, and C represents the frame length; and, B > (A +0.1) xI, A representing the longest delay time of the memory module response, I representing the instantaneous speed of the memory module;
and when the cache data volume Z is smaller than the backpressure indication threshold lower limit Y, the data selection module starts to read data and inputs the data into the cache flow control module, wherein Y is X m, and m represents a switching coefficient.
Optionally, the control module includes a configuration register, the frame data generation module includes M sets of shift registers, the control module generates configuration values through the configuration register and inputs the configuration values into the M sets of shift registers to control the M sets of shift registers to generate M kinds of payload data, and the frame data generation module combines the M kinds of payload data into the third analog data;
each group of shift registers comprises N triggers, the configuration values input by the same bit in the M groups of shift registers are different, and only one configuration value is valid; the bandwidth occupied by each type of payload data is determined by the value of the number N of the triggers, wherein the minimum proportion value of the payload data is 1/N.
Optionally, the first type of analog data is a PN code; the second type of analog data is pre-recorded hard disk data; the third type of analog data is frame data.
Optionally, the analog data generating apparatus further includes:
the scrambling module is connected between the coding module and the modulation module, the input end of the scrambling module is connected with the output end of the coding module, and the output end of the scrambling module is connected with the input end of the modulation module.
Optionally, the data sending module includes a radio frequency module.
Optionally, the analog data generating apparatus further includes: and the input end of the driving module is connected with the output end of the modulation module, and the output end of the driving module is connected with the input end of the radio frequency module.
According to another aspect of the invention, a method for generating simulation data of a remote sensing satellite is provided, which comprises the following steps:
determining the data type of the analog data sent to the user terminal;
and selecting the corresponding data generation module from the plurality of data generation modules according to the determined data type of the simulation data, generating the simulation data by using the selected data generation module, and sending the simulation data to the user terminal.
Optionally, the generating the simulation data by using the selected data generating module includes:
when the determined data type of the analog data is first-class analog data, selecting a modulation module to generate a PN code, and carrying out differential coding to form the first-class analog data;
when the determined data type of the simulation data is second-type simulation data, selecting a cache flow control module to call pre-recorded hard disk data from a storage module as the second-type simulation data;
and when the determined data type of the analog data is the third type of analog data, selecting a frame data generation module to generate frame data, and encoding the frame data to be used as the third type of analog data.
Optionally, the process of generating frame data includes: a configuration register; inputting the configuration value of the register into a shift register; encoding the lowest order configuration value; generating an indication of payload data generation based on the encoding; generating corresponding payload data according to the payload data generation instruction; when the generated payload data reaches the data generation demand, forming a register shift indication; and according to the register shifting indication, the shifting register starts to shift, and the type of payload data which needs to be generated currently is selected through coding.
Optionally, the cache flow control module controls a data transmission rate of the hard disk data called from the storage module according to the current cache data amount.
After the determined analog data is generated, the generated analog data needs to be processed correspondingly, and a proper bit rate is selected according to actual requirements, and a clock frequency, a working mode of a DAC (Digital to analog converter) chip and a rate of a high-speed serial interface are configured. Because the analog data is divided into an I path and a Q path, I/Q shunting is required to be carried out on the analog data, the analog data is mapped and quantized according to a constellation mapping rule, and finally, pulse forming is carried out and then the analog data is sent to a terminal through a DAC chip.
The invention provides a device and a method for simulating data of a remote sensing satellite, which can generate simulated data of different data types so as to be suitable for different test scenes, improve the efficiency of test work and reduce the test cost.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
The drawings are included to provide a better understanding of the present solution and are not to be construed as limiting the invention. Wherein:
FIG. 1 is a schematic block diagram of an apparatus for generating simulated data of a remote sensing satellite according to an embodiment of the present invention;
FIG. 2 is a back pressure control schematic in an embodiment of the present invention;
FIG. 3 is a circuit diagram of AOS frame payload data bandwidth configuration in an embodiment of the invention;
FIG. 4 is a flow chart of AOS frame data generation in an embodiment of the present invention;
FIG. 5 is a diagram illustrating steps in a method for generating simulated data for a remote sensing satellite in an embodiment of the invention;
FIG. 6 is a flow chart of the generation of different simulation data in an embodiment of the present invention;
FIG. 7 is a schematic diagram of a simulation data generation method in an embodiment of the present invention;
FIG. 8 is a flow diagram of data processing in an embodiment of the present invention;
description of reference numerals:
an interface module 1; a control module 2; a storage module 3; a data selection module 4; a radio frequency module 5; a modulation module 6; a buffer flow control module 7; a frame data generation module 8; an encoding module 9; a scrambling module 10; a drive module 11.
Detailed Description
Exemplary embodiments of the present invention are described below with reference to the accompanying drawings, in which various details of embodiments of the invention are included to assist understanding, and which are to be considered as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
The invention provides a simulation data generating device of a remote sensing satellite, as shown in figure 1, comprising:
the interface module 1, the input end of the interface module 1 connects the external interface;
the input end of the control module 2 is connected with the first output end of the interface module 1;
the input end of the storage module 3 is connected with the second output end of the interface module 1;
a first input end of the data selection module 4 is connected with the output end of the control module 2, and a second input end of the data selection module 4 is connected with the output end of the storage module 3;
the data selection module is used for selectively connecting the output ends of the data selection modules with the input ends of the data generation modules.
Specifically, the control module 2 implements control of an FPGA (Field Programmable Gate Array) circuit in an embedded manner, and the FPGA circuit outputs generated data signals and driving signals. The data signals are input to the relevant data processing chips, and the corresponding chips are driven by the driving signals to carry out signal processing. The driving circuit drives the radio frequency circuit to send data signals. With the wide application of remote sensing technology, the number of remote sensing satellites is increasing, and the formats of data transmission between different satellites are different. In order to cooperate with the test and maintenance of various types of ground receiving equipment, the number of the data generation modules in this embodiment is at least three, and three types of simulation data, namely, first type simulation data, second type simulation data, and third type simulation data, can be generated. The first type of analog data can be various PN codes, and the code patterns can be configured and generated in real time through an upper computer and can be used for realizing the test of the channel error rate of the receiving equipment; the second type of analog data is sent to a prerecorded hard disk, and the data is received remote sensing satellite data which is stored in advance for post analog sending and can simulate a remote sensing satellite in an actual working state to send signals; the third type of simulation data is sent AOS (Advanced orbital System) frame data, and the type and bandwidth of payload data in the AOS frame data can be configured and generated in real time by an upper computer and can be used for simulating data sending in various scenes. The combination and the sending of the three types of simulation data can realize the diversity of test scenes and the adaptability universality of receiving equipment, and reduce the test and maintenance costs.
As an optional implementation, the simulation data generating apparatus further includes: the input end of the data sending module is connected to the output ends of the data generating modules, and is configured to send analog data to the user terminal, and the data sending module in this embodiment may adopt the radio frequency module 5.
As an optional implementation, the plurality of data generating modules specifically include:
the modulation module 6 is used for connecting a first output end of the data selection module 4 with an input end of the modulation module 6 when the data transmission module transmits the first type of analog data to the user terminal;
the cache flow control module 7 is used for connecting a second output end of the data selection module 4 with an input end of the cache flow control module 7 when the data sending module sends the second type of analog data to the user terminal;
the frame data generating module 8, when the data sending module sends the third type of analog data to the user terminal, the third output end of the data selecting module 4 is connected with the frame data generating module 8;
and a first input end of the coding module 9 is connected with an output end of the buffer flow control module 7, and a second input end of the coding module 9 is connected with an output end of the frame data generating module 8.
Specifically, in this embodiment, the data selection module 4 is selectively connected to each module, and when the first type of analog data is selected to be sent, the output interface of the data selection module is connected to the modulation module 6; when the second type of analog data is selected to be sent, the data of the data selection module 4 is input by the storage module 3, and an output interface of the data selection module 4 is connected with the cache flow control module 7; when the third type of analog data is selected to be sent, the output interface of the data selection module 4 is connected with the frame data generation module 8. Through the technical scheme, the corresponding simulation data can be generated according to the data type required by the test. The first type of analog data may be a PN code; the second type of analog data may be pre-recorded hard disk data; the third type of analog data may be frame data.
An input interface of the buffer flow control module 7 is connected to the data selection module 4, as shown in fig. 2, the backpressure indication signal is fed back to the data selection module 4, and an output interface of the buffer flow control module 7 is connected to the encoding module 9. When the device is operated, the storage module 3 is required to be used for caching data, sufficient data is provided for the system, the output data rate of the system is ensured to be uniform and uninterrupted, and when the data is sent, the loaded data file is firstly read from the storage module 3 and then sent to the modulation module 6. Because the storage module 3 uses a high-speed interface, the instantaneous rate is I megabits/second 2Gb/s, and the read data is to be transmitted to the modulation module 6 at a constant speed of J megabits/second, and the relationship that I is greater than J needs to be satisfied. Therefore, the buffer flow control module 7 is required to match different interface rates, the data transmission rate is determined by the last stage, the buffer flow control module is back-pressed to the front end, when the buffer data amount Z is greater than the back-pressure indication threshold upper limit X, the front end stops reading data and does not write the data into the buffer, where X ═ B-C × a, a is the number of AOS frames in the way from the back-pressure indication generating circuit to the data Input circuit of the system, where a ═ 2 in this embodiment, because a FIFO (First Input First Output, First in First out) memory is used, there is a situation of data overflow, so that a space of 2 frames is reserved to ensure that data in FIFO does not overflow, it should be noted that 2 is the minimum value of a, and the number of AOS frames is not limited to 2; when the buffer data volume Z is smaller than the backpressure indication threshold value Y, the front end starts to read data and write the data into the buffer, Y is X b, b is a switching coefficient for avoiding the data from being frequently written into the system and being stopped, in this embodiment, b is 0.5, and the switching coefficient b can also be other values, so that the system is prevented from being in an oscillation state for a long time, and the cost of verification and design can be reduced. By the method, the cache flow control module 7 can continuously and uniformly send the data to the modulation module 6. Assuming that the storage module 3 responds to the longest delay of a seconds, the instantaneous rate is I, the total buffer capacity is B megabits, the length of the AOS frame is C bits, and the above variables need to satisfy the following relations:
B＞(A+0.1)×I
wherein, A can be read for a long time, and the response time of the longest read operation is recorded.
As an alternative implementation, as shown in fig. 3, the control module 2 includes a configuration register, the frame data generation module 8 includes M sets of shift registers, the control module 2 generates a configuration value through the configuration register and inputs the configuration value into the M sets of shift registers to control the M sets of shift registers to generate M types of payload data, and the frame data generation module 8 combines the M types of payload data into third analog data; each group of shift registers comprises N triggers, the configuration values input by the same bit in M groups of shift registers are different, and only one configuration value is effective; the bandwidth occupied by each type of payload data is determined by the value of the number N of the triggers, wherein the minimum proportion value of the payload data is 1/N.
The input interface of the frame data generating module 8 is connected with the data selecting module 4, and the output interface of the frame data generating module 8 is connected with the encoding module 9. As shown in fig. 3 and 4, AOS frame data is composed of M kinds of payload data, and is controlled by M sets of shift registers. Each group of shift registers is composed of N triggers, and the proportion of each payload is determined by corresponding payload data configuration. The value of N determines the bandwidth occupied by each type of data, wherein the minimum proportion value is 1/N, the higher the N is, the higher the bandwidth resolution can be realized, and the more flexible the sequential combination of various types of payload data can be realized. The distribution proportion and the composition sequence of the payload data can be configured in real time by controlling the shift register. For example, in fig. 3, the configuration values of the second bit 102 of the first group of shift registers, the second bit 202 of the second group of shift registers, to the second bit M02 of the mth group of shift registers are all different from each other, and only one of the M configuration values located in the same bit is valid, so as to control the M groups of shift registers to generate M kinds of payload data. The payload data in the embodiment is generated by controlling the shift register by using the configuration register, the configuration values in the M payload data configuration registers are stored into the M groups of shift registers before the work is started, when the work is started, M lowest bit values of the initial values of the M groups of shift registers are encoded, a corresponding payload data generation instruction is generated according to the encoding, and corresponding payload data is generated according to the payload data generation instruction. When the generated payload data reaches the data generation demand of each time, a register shift instruction is generated, the shift register starts to shift according to the register shift instruction, the type of the payload which needs to be generated at present is selected through coding, and encapsulation information such as an identifier and a virtual channel number of the payload data which are configured in advance by an upper computer is combined with the payload data which is generated in real time to realize the generation of complete frame data, wherein the payload data comprises but not limited to an incremental number, a PN code and a fixed numerical value.
Illustratively, the frame header configured in this embodiment is 0x1ACFFC1D, the version number is 0b01, the space identifier is 0x3B, "M" is 10, "N" is 20, that is, each 20 frames of AOS frame data is determined by 10 kinds of payload data. For example, 20 frames of data are composed of 10 frames of payload data a and 10 frames of payload data B, and the bit width of the configuration register M1 for controlling generation of data a and the configuration register M2 for controlling generation of data B are both 20. And the values in registers M1 and M2 may be:
M1＝“0000_0011_1111_1111”
M2＝“1111_1100_0000_0000”
the coding module 9 uses RS coding (Reed-solomon codes, a kind of forward error correction channel coding, effective on the polynomial generated by correcting the oversampled data), by means of calling IP. RS coding is commonly referred to as (n, k) coding, where n is the total number of symbols in a code block and k is the number of information or data symbols. The complete code block is formed by k information symbols followed by (n-k) check symbols. In the present embodiment, the CCSDS coding specification is used, the symbol width is 8, the scale factor "h" is 11, the total number of symbols "n" in the code block is 255, and the number of data symbols "k" is 223.
The modulation module 6 may be configured to perform a B-mode constellation mapping rule of QPSK (Quadrature Phase Shift Keying) modulation, after the data is I/Q split, the one-way data may be regarded as a baseband signal performing BPSK (Binary Phase Shift Keying) modulation, and the constellation mapping point of the B-mode may be vector-synthesized from initial phases of two orthogonal BPSK modulation signals. When the serial bit stream in the baseband signal of the path I is 1, the initial phase corresponding to BPSK modulation carrier is 0 degree; when the serial bit stream is 0, the initial phase corresponding to the BPSK modulated carrier is 180 °; when the serial bit stream is 1 in the baseband signal of the Q path, the initial phase corresponding to the BPSK modulated carrier is 90 °; when the serial bit stream is 0, the initial phase for the BPSK modulated carrier is 270 °.
As an alternative embodiment, as shown in fig. 1, the analog data generating apparatus further includes:
and the scrambling module 10 is connected between the coding module 9 and the modulation module 6, the input end of the scrambling module 10 is connected with the output end of the coding module 9, and the output end of the scrambling module 10 is connected with the input end of the modulation module 6. The scrambling module 10 modulo-2 adds the pseudorandom sequence to the input data to cause the data to jump enough bits to achieve bit synchronization for the user terminal. This operation is optional, and the scrambling process is performed in units of each transmission frame. The initial state of the shift register may be set when scrambling starts for each transmission frame.
As an alternative embodiment, as shown in fig. 1, the analog data generating apparatus further includes: and the input end of the driving module 11 is connected with the output end of the modulation module, and the output end of the driving module 11 is connected with the input end of the radio frequency module 5. The FPGA circuit generates a driving signal of the peripheral chip and outputs the driving signal to the corresponding chip to drive the chip to work.
The invention also provides a method for generating simulation data of the remote sensing satellite, which comprises the following steps as shown in fig. 5:
step S1, determining the data type of the analog data sent to the user terminal;
and step S2, selecting a corresponding data generation module from the plurality of data generation modules according to the determined data type of the simulation data, generating the simulation data by using the selected data generation module and sending the simulation data to the user terminal.
Specifically, a specific flowchart of the simulation data generation method is shown in fig. 6, in this embodiment, simulation data of three different data types, which are the first type of simulation data, the second type of simulation data, and the third type of simulation data, can be generated. The first type of analog data can be various PN codes, and the code patterns can be configured and generated in real time through an upper computer and can be used for realizing the test of the channel error rate of the receiving equipment; the second type of analog data is sent to a prerecorded hard disk, and the data is received remote sensing satellite data which is stored in advance for post analog sending and can simulate a remote sensing satellite in an actual working state to send signals; the third type of simulation data is sent AOS frame data, the type and bandwidth of payload data in the AOS frame data can be configured and generated in real time through an upper computer, and the third type of simulation data can be used for simulating data sending in various scenes. The combination and the sending of the three types of simulation data can realize the diversity of test scenes and the universality of the adaptation of receiving equipment, and reduce the cost of test and maintenance.
As an alternative embodiment, the process of generating the simulation data by using the selected data generation module includes:
when the determined data type of the analog data is first-class analog data, selecting a modulation module to generate a PN code, and performing differential coding to obtain the first-class analog data;
when the data type of the determined simulation data is second-type simulation data, selecting a cache flow control module to call pre-recorded hard disk data from a storage module as the second-type simulation data;
and when the data type of the determined simulation data is the third type of simulation data, selecting a frame data generation module to generate frame data, and encoding the frame data to be used as the third type of simulation data.
As an optional embodiment, the cache flow control module 7 controls the data transmission rate of the hard disk data called from the storage module 3 according to the current cache data amount. As shown in fig. 7, the buffer flow control module 7 feeds back the backpressure indication signal to the data selection module 4.
The generated analog data is processed and then sent to the terminal, and the data processing flow is shown in fig. 8 and includes:
the rate adaptation, according to the actual situation, selects the appropriate bit rate through the control module, and the method can set three rates, which are 160MHz, 300MHz and 450MHz respectively. Configuring clock frequency, DAC chip working mode and high-speed serial interface rate according to bit rate
And I/Q splitting, namely splitting the data into I-path data and Q-path data according to the I/Q-path identifier of the AOS frame format.
Mapping and quantization, according to the B-mode constellation mapping rule of QPSK (Quadrature Phase Shift Keying) modulation, after data is I/Q split, one-way data can be regarded as a baseband signal subjected to BPSK (Binary Phase Shift Keying) modulation, and the constellation mapping point of the B-mode can be vector-synthesized from the initial phases of two orthogonal BPSK modulation signals. When the serial bit stream in the baseband signal of the path I is 1, the initial phase corresponding to BPSK modulation carrier is 0 degree; when the serial bit stream is 0, the initial phase corresponding to the BPSK modulated carrier is 180 °; when the serial bit stream is 1 in the baseband signal of the Q path, the initial phase corresponding to the BPSK modulated carrier is 90 °; when the serial bit stream is 0, the initial phase for the BPSK modulated carrier is 270 °.
And pulse forming, wherein the rectangular pulse is formed, and the shape of a transmitted baseband signal is improved.
And the DA conversion configuration is used for sending the analog signals through the DAC chip.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired results of the technical solutions disclosed in the present invention can be achieved.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. An apparatus for generating simulation data of a remote sensing satellite, comprising:
the input end of the interface module is connected with an external interface;
the input end of the control module is connected with the first output end of the interface module;
the input end of the storage module is connected with the second output end of the interface module;
a first input end of the data selection module is connected with an output end of the control module, and a second input end of the data selection module is connected with an output end of the storage module;
the output end of the data selection module can be selectively connected with the input ends of the data generation modules.
2. The analog data generating apparatus according to claim 1, further comprising: the input end of the data transmission module is connected with the output ends of the data generation modules and is configured to transmit the analog data to a user terminal.
3. The simulation data generation apparatus according to claim 2, wherein the plurality of data generation modules specifically include:
the modulation module is used for connecting a first output end of the data selection module with an input end of the modulation module when the data transmission module transmits first-class analog data to the user terminal;
the cache flow control module is used for connecting a second output end of the data selection module with an input end of the cache flow control module when the data sending module sends the second type of analog data to the user terminal;
the frame data generating module is used for connecting a third output end of the data selecting module with the frame data generating module when the data sending module sends third-type analog data to the user terminal;
and a first input end of the coding module is connected with the output end of the cache flow control module, and a second input end of the coding module is connected with the output end of the frame data generating module.
4. The analog data generating apparatus according to claim 3, wherein when the data selecting module is connected to the buffer flow control module, the data selecting module retrieves the second type of analog data from the storage module and transmits the second type of analog data to the modulating module through the buffer flow control module and the encoding module, and the buffer flow control module controls a data transmission rate by feeding back a backpressure indication signal to the data selecting module:
when the cache data volume Z in the cache flow control module is greater than the backpressure indication threshold upper limit X, the data selection module stops reading data and does not input the data to the cache flow control module any more, wherein X-B-C a represents the total cache capacity of the cache flow control module, a represents the frame number of the backpressure indication signal in the transmission process, and C represents the frame length; and, B > (A +0.1) xI, A representing the longest delay time of the memory module response, I representing the instantaneous speed of the memory module;
and when the cache data volume Z is smaller than the backpressure indication threshold lower limit Y, the data selection module starts to read data and inputs the data into the cache flow control module, wherein Y is X b, and b represents a switching coefficient.
5. The analog data generating apparatus of claim 3, wherein the control module comprises a configuration register, the frame data generating module comprises M sets of shift registers, the control module generates configuration values through the configuration register and inputs the configuration values into the M sets of shift registers to control the M sets of shift registers to generate M kinds of payload data, and the frame data generating module combines the M kinds of payload data into the third analog data;
each group of shift registers comprises N triggers, the configuration values input by the same bit in the M groups of shift registers are different, and only one configuration value is valid; the bandwidth occupied by each type of payload data is determined by the value of the number N of the triggers, wherein the minimum proportion value of the payload data is 1/N.
6. The analog data generating apparatus of claim 3, wherein the first type of analog data is a PN code; the second type of analog data is pre-recorded hard disk data; the third type of analog data is frame data.
7. The analog data generating apparatus according to claim 3, characterized in that the analog data generating apparatus further comprises:
the scrambling module is connected between the coding module and the modulation module, the input end of the scrambling module is connected with the output end of the coding module, and the output end of the scrambling module is connected with the input end of the modulation module.
8. The analog data generating apparatus of claim 3, wherein the data transmitting module comprises a radio frequency module.
9. The analog data generating apparatus according to claim 8, characterized in that the analog data generating apparatus further comprises: and the input end of the driving module is connected with the output end of the modulation module, and the output end of the driving module is connected with the input end of the radio frequency module.
10. A method for generating simulation data of a remote sensing satellite is characterized by comprising the following steps:
determining the data type of the analog data sent to the user terminal;
and selecting the corresponding data generation module from the plurality of data generation modules according to the determined data type of the simulation data, generating the simulation data by using the selected data generation module, and sending the simulation data to the user terminal.
11. The method of generating simulation data according to claim 10, wherein the generating the simulation data using the selected data generating module comprises:
when the determined data type of the analog data is first-class analog data, selecting a modulation module to generate a PN code, and carrying out differential coding to form the first-class analog data;
when the determined data type of the simulation data is second-type simulation data, selecting a cache flow control module to call pre-recorded hard disk data from a storage module as the second-type simulation data;
and when the determined data type of the analog data is the third type of analog data, selecting a frame data generation module to generate frame data, and encoding the frame data to be used as the third type of analog data.
12. The method according to claim 11, wherein the cache flow control module controls a data transfer rate of the hard disk data from the storage module according to a current cache data amount.
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