CN116094577B - Multi-mode frame reconfigurable universal telemetry transmitter - Google Patents
Multi-mode frame reconfigurable universal telemetry transmitter Download PDFInfo
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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
- H04B7/18502—Airborne stations
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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- H04B1/0483—Transmitters with multiple parallel paths
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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Abstract
The invention provides a multi-mode frame reconfigurable universal telemetry transmitter which comprises a data acquisition module, a channel table reconfiguration module, a channel coding selection module, a code type selection module, a modulation mode selection module, a first up-conversion module, a second up-conversion module, a switch selection module, a first receiving detection module, a second receiving detection module, a first power amplifier, a second power amplifier, a code rate clock generation module, a parameter storage module and a DDR memory. The invention has the beneficial effects that: the universality is good, a plurality of modulation modes and the reconfigurability of a channel table are supported, and the requirements of different tasks are met; the state version of the telemetering transmitter is less, and the production cost is effectively reduced through batch production; the delivery period of a telemetry transmitter is reduced, the delivery of shelf products is realized, and the project management risk is reduced; the system has a fault detection function, and realizes high-reliability design of products by matching with redundant backup of key nodes; the performance parameters only need to be injected once, and the next power-on automatic loading is not needed to be configured each time.
Description
Technical Field
The invention belongs to the field of aerospace telemetry, and particularly relates to a multimode frame reconfigurable universal telemetry transmitter.
Background
The space craft including carrier rocket and strategic missile is a symbol of national comprehensive national force, and the wireless telemetry system is used as a component of the space craft and has the function of transmitting the state and data information of the space craft to the ground for analysis. The main function of the telemetering transmitter in the wireless telemetering system is to convert the information of analog quantity, digital quantity, switching value, image and the like collected by other systems of the aerospace craft into high-frequency electromagnetic waves which contain telemetering information and can be transmitted in space after being modulated by a certain framing. The quality of the telemetry transmitter can influence whether information on the aerospace craft can be accurately transmitted to the ground control station or not, and the command decision of the ground station is influenced, so that success and failure of telemetry tasks are determined. Because the application and use scenes of different projects are different, different telemetry transmitters are required to be customized according to the model of each project, and the problems of long lead time, high cost and complex batch state management of the telemetry transmitters are caused by the characteristics of small number of carrier rockets and strategic missiles and high reliability requirements. The current commercial rocket industry rises rapidly and is characterized by faster lead time, lower product cost and higher product reliability than traditional carrier rockets. It is apparent that telemetry transmitters designed by conventional methods do not meet current needs.
Disclosure of Invention
In view of the above, the invention aims to provide a multi-mode frame reconfigurable universal telemetry transmitter so as to solve the problems of less requirements on different projects of an rocket-borne telemetry transmitter, high reliability requirement and high sensitivity of a rising commercial carrier rocket to cost in the prior art.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
the multi-mode frame reconfigurable universal telemetry transmitter comprises a data acquisition module, a channel table reconfiguration module, a channel coding selection module, a code type selection module, a modulation mode selection module, a first up-conversion module, a second up-conversion module, a switch selection module, a first receiving detection module, a second receiving detection module, a first power amplifier, a second power amplifier, a code rate clock generation module, a parameter storage module and a DDR memory, wherein the channel table reconfiguration module is connected with the data acquisition module, the channel coding selection module, the code rate clock generation module, the parameter storage module and the DDR memory, the channel table reconfiguration module is also connected with an external PC in signal connection, the code rate clock generation module and the parameter storage module are in signal connection, the parameter storage module is connected with the input end of the code type selection module in signal connection, the output end of the code type selection module is also connected with the input end of the modulation mode selection module, the output end of the modulation mode selection module is connected with the input end of the first up-conversion module in signal connection, the second up-conversion module is connected with the input end of the second up-conversion module, the input end of the second up-conversion module is also connected with the input end of the second up-conversion module, the input end of the switch selection module is also connected with the input end of the first up-conversion module, the input end of the first up-conversion module is connected with the input end of the output end of the modulation mode selection module, the output end of the output module, A second power amplifier input.
Further, the data acquisition module comprises an analog quantity channel, a switching quantity channel, a digital quantity channel, an image channel and an output channel, wherein the analog quantity channel, the switching quantity channel, the digital quantity channel and the image channel are all in signal connection with the output channel, and the output channel is also in signal connection with the channel table reconstruction module.
Further, the working method of the channel table reconstruction module comprises the following steps:
a1, powering up a telemetry transmitter to work, and starting a channel table reconstruction module to work;
a2, the channel table reconstruction module reads parameter information from the parameter storage module, wherein the parameter information comprises subframe length, subframe type, frame head length, frame head content, telemetry word length, subframe synchronization code and telemetry code rate;
a3, the channel table reconstruction module calculates the full frame length according to the subframe length and the subframe length, and reads the full frame length data from the parameter storage module;
a4, storing the data read in the A3 into a DDR memory for cyclic reading in the framing process of the channel table reconstruction module;
a5, generating a telemetry word sampling clock according to the PCM code sampling clock output by the code rate clock generating module and combining the telemetry word length parameter read by the A2, wherein the expression of the telemetry word sampling clock is as follows:
wherein, the liquid crystal display device comprises a liquid crystal display device,
representing the PCM code sampling clock,/->
Representing a telemetry word sampling clock, B representing a telemetry word length;
a6, use
Reading the full frame content in the DDR memory as a clock once cycle;
a7, use
And (3) performing parallel-serial conversion on the telemetry word sampling clock acquired by the A6 as a clock to finish output.
Further, in step A3, the calculation formula of the full frame length is:
full frame length = subframe length
Subframe length.
Further, the channel table reconstruction module has a channel table reconstruction function, and the channel table reconstruction function is realized, and the method comprises the following steps:
b1, completing hardware connection through a reconstruction instruction or a response interface by using a PC, powering up a telemetry transmitter, and starting a channel table reconstruction module;
b2, after the telemetry parameter group is framed, downloading the telemetry parameter group to a channel table reconstruction module, and storing the telemetry parameter group in a parameter storage module;
b3, waiting for response reply of the channel table reconstruction module, if the storage is successful, carrying out B4, otherwise, repeating B2;
b4, framing the channel table content in a sub-package mode, downloading the frame to a channel table reconstruction module, completing data analysis by the channel table reconstruction module, and storing the data to an address corresponding to the parameter storage module;
b5, waiting for response reply of the channel table reconstruction module, if the storage is successful, carrying out B6, and otherwise, repeating B4;
and B6, after all the channel table contents are stored, and the storage is successful, the telemetry transmitter is powered off and restarted, so that the function of the channel table reconstruction module is completed.
Further, in step B3, the telemetry parameters include a subframe length, a subframe type, a frame header length, a frame header content, a telemetry word length, a subframe synchronization code, a telemetry code rate, a channel coding type, a code pattern, and a modulation type.
Further, the channel coding selection module is used for reading parameters of the channel coding type from the parameter storage module after the telemetry transmitter is powered on, so as to determine whether to perform channel coding on the binary code stream output by the channel table reconstruction module and what kind of channel coding is performed;
the types of channel coding include TPC coding, LDPC coding, and Turbo coding.
Further, the code pattern selection module is used for reading the parameters of the code pattern from the parameter storage module after the telemetry transmitter is powered on, so as to determine what type of baseband coding is carried out on the binary code stream output by the channel coding selection module;
the code pattern comprises a non-return-to-zero level code, a non-return-to-zero transmission number, a non-return-to-zero null number, a bidirectional level code, a bidirectional transmission number, a bidirectional null number, a differential bidirectional transmission number and a differential bidirectional null number.
Further, the modulation mode selection module is used for reading the parameters of the modulation type from the parameter storage module after the telemetry transmitter is powered on, so as to determine what type of quadrature modulation is carried out on the baseband code output by the code type selection module;
the modulation type includes CPFSK, BPSK, QPSK, OQPSK and MSK.
Further, the first up-conversion module and the second up-conversion module have the same structure.
Further, the switch selection module performs 2-1 selection output on the modulation signals output by the first up-conversion module and the second up-conversion module according to the detection results of the first receiving detection module and the second receiving detection module.
Furthermore, the hardware structures of the first power amplifier and the second power amplifier are the same, and are redundant backups.
Compared with the prior art, the multi-mode frame reconfigurable universal telemetry transmitter has the following advantages:
the multi-mode frame reconfigurable universal telemetry transmitter has good universality, supports multiple modulation modes and the reconfiguration of a channel table, and meets the requirements of different tasks; the state version of the telemetering transmitter is few, the production cost can be effectively reduced through batch production, and the economic benefit is improved; the delivery cycle of the telemetry transmitter is greatly reduced, the shelf product delivery is truly realized, and the project management risk is reduced; the system has a fault detection function, and is matched with the redundant backup of the key node to realize the high-reliability design of the product; the performance parameters only need to be injected once, and the next power-on automatic loading is not needed to be configured each time.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of a telemetry transmitter set according to embodiment 1 of the present invention;
fig. 2 is a schematic diagram of a data acquisition module according to embodiment 1 of the present invention;
fig. 3 is a schematic diagram of a telemetry transmitter embodying embodiment 2 of the present invention.
Reference numerals illustrate:
1. a data acquisition module; 101. analog quantity channel; 102. switching the quantity channel; 103. a digital quantity channel; 104. an image channel; 105. an output channel; 2. a channel table reconstruction module; 3. a channel code selection module; 4. a code pattern selection module; 5. a modulation mode selection module; 6. a first up-conversion module; 7. a second up-conversion module; 8. a switch selection module; 9. a first reception detection module; 10. a second reception detection module; 11. a first power amplifier; 12. a second power amplifier; 13. code rate clock generation module; 14. a parameter storage module; 15. DDR memory.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
Example 1
As shown in fig. 1-2, the multimode frame reconfigurable universal telemetry transmitter, and more particularly, to multimode reconfigurable high reliability universal arrow-borne telemetry transmitters. The device comprises: the multimode reconfigurable high-reliability universal arrow-mounted telemetry transmitter comprises a multitasking universal mode, a channel table content reconfiguration and channel coding mode, a baseband coding mode and a modulation mode. The key device adopts a redundant backup mode, and the reliability of the device is high.
In embodiment 1 of the present invention, the data acquisition module 1 is for receiving input analog quantity and switching value acquisition, PCM coding, digital quantity and image information. The analog quantity, the switching quantity, the digital quantity, and the number of paths of the image information can be appropriately adjusted as needed. The following 5 modules of the data acquisition module 1 specifically comprise an analog quantity channel 101, a switching quantity channel 102, a digital quantity channel 103, an image channel 104 and an output channel 105. As shown in fig. 2, wherein the channel selection end of the output channel 105 is connected to the channel table reconstruction module 2.
The analog quantity channel 101 completes the functions of filtering processing, voltage following, AD range matching processing, multi-channel multiplexing and analog-to-digital conversion of the acquired signals, and the acquisition path number of the analog quantity can be adjusted according to the needs. The interface logic of the analog quantity channel 101 is realized by logic resources in the FPGA, and the functions of analog quantity channel 101 selection and analog-digital conversion output data acquisition and processing are completed.
The switching value channel 102 completes the functions of optocoupler isolation, voltage following, AD range matching processing, multi-channel multiplexing and analog-to-digital conversion of the acquired signals, and the acquisition path number of the switching value can be adjusted according to the needs. The interface logic of the switching value channel 102 is realized by logic resources in the FPGA, and the functions of switching value acquisition channel selection and analog-digital conversion output data acquisition processing are completed.
The digital quantity channel 103 completes the functions of impedance matching and level conversion of the acquired digital signals, outputs the result to interface logic of the digital quantity channel 103, and the acquisition path number of the digital quantity can be adjusted according to the requirement. The interface logic of the digital quantity channel 103 is realized by logic resources in the FPGA, and the control of the level conversion chip, the serial-parallel conversion of the digital signals and other asynchronous receiving processes are completed.
The image channel 104 completes the functions of impedance matching and level conversion of the acquired image signals, and outputs the result to the interface logic of the image channel 104, and the acquisition path number of the image can be adjusted as required. The interface logic of the image channel 104 is realized by logic resources in the FPGA, and the control of the level conversion chip and the receiving processing of the digital signals are completed.
The output channel 105 performs the function of selecting and outputting the multiple acquisition signals according to the channel selection signal output by the channel table reconstruction module 2, and here, a remote measurement word is output, and the bit width of the remote measurement word can be appropriately adjusted according to the needs.
In embodiment 1 of the present invention, the channel table reconstruction module 2 stores the full-frame channel mapping table generated by the sub-frame ID position, the sub-frame count position, the frame header length, the frame header content and the transmission content corresponding to the channel table position into the DDR memory 15 according to the sub-frame length, the sub-frame type, the sub-frame ID position, the sub-frame count position, the frame header length, and the transmission content corresponding to the channel table position stored in the parameter storage module 14, and in the working process, the channel table reconstruction module 2 generates the channel table generation function according to the sampling clock generated by the code rate clock generation module 13 and the full-frame channel mapping table in the DDR memory 15. The working procedure of the channel table reconstruction module 2 is as follows:
(1) The device is powered on to work, and the channel table reconstruction module 2 starts to work.
(2) The channel table reconstruction module 2 reads all parameter information from the parameter storage module 14, including subframe length, subframe type, frame header length, frame header content, telemetry word length, subframe synchronization code, telemetry code rate;
(3) Calculating a full frame length from the subframe length and the subframe length, the full frame length=the subframe length
Sub-frame length, reading full-frame length data from the corresponding address of the parameter storage module 14;
(4) Storing the data read in the step 3 into a DDR memory 15 for cyclic reading in the framing process of the channel table reconstruction module 2;
(5) And (2) generating a telemetry word sampling clock according to the PCM code sampling clock output by the code rate clock generating module 13 and combining the telemetry word length parameters read in the step (2), wherein the telemetry word sampling clock is specifically expressed as:
wherein->
Representing the PCM code sampling clock,/->
Representing a telemetry word sampling clock, B representing a telemetry word length;
(6) Using
The full-frame content in the DDR memory 15 is read as a clock one-time cycle, and is mapped to a corresponding signal path or information such as a frame header, a frame count, an ID number or a subframe synchronization code according to the currently read content;
(7) Using
And (5) completing parallel-serial conversion of the telemetry word acquired in the step (6) as a clock to complete output.
The above process is a working flow of the channel table reconstruction module 2, and the channel table reconstruction module 2 can also realize the function of the channel table reconstruction module, specifically as follows:
(1) The PC is used for completing hardware connection through a reconstruction instruction/response interface, the device is powered on to work, and the channel table reconstruction module 2 starts to work;
(2) The method comprises the steps that a telemetering parameter group frame, parameters comprise a channel coding type, a code pattern and a modulation mode except for a subframe length, a subframe type, a frame header length, a frame header content, a telemetering word length, a subframe synchronous code and a telemetering code rate, and the parameters are downloaded to a channel table reconstruction module 2 and then stored to a parameter storage module 14;
(3) Waiting for the response reply of the channel table reconstruction module 2, if the storage is successful, performing the step 4, otherwise repeating the step 2;
(4) The channel table content is packetized and framed, and is downloaded to the channel table reconstruction module 2, the channel table reconstruction module 2 completes data analysis, and the data is stored to the address corresponding to the parameter storage module 14;
(5) Waiting for the response reply of the channel table reconstruction module 2, if the storage is successful, performing the step 6, otherwise repeating the step 4;
(6) And after all the channel table contents are stored, and the storage is successful, the device is powered off and restarted, so that the function of the channel table reconstruction module is completed.
In embodiment 1 of the present invention, after the channel code selection module 3 is powered on, the channel code type parameter is read from the parameter storage module 14, so as to determine whether to perform channel coding on the binary code stream output by the channel table reconstruction module 2, and what kind of coding is performed, including TPC coding, LDPC coding, and Turbo coding.
In embodiment 1 of the present invention, after the code pattern selection module 4 is powered on, the code pattern parameters are read from the parameter storage module 14 to determine what type of baseband coding is performed on the binary code stream output by the channel code selection module 3, and the code pattern includes non-return-to-zero level code (NRZ-L), non-return-to-zero pass number (NRZ-M), non-return-to-zero space number (NRZ-S), and bidirectional level code (NRZ-S)
) Two-way number transmission (+)>
) Two-way null number (+)>
) Differential two-way number (>
) Differential bi-directional null number (>
）。
In embodiment 1 of the present invention, after the modulation scheme selection module 5 is powered on, the modulation type parameter is read from the parameter storage module 14, so as to determine what type of quadrature modulation is performed on the baseband code outputted from the code pattern selection module 4. Including CPFSK, BPSK, QPSK, OQPSK and MSK.
In embodiment 1 of the present invention, the first up-conversion module 6 and the second up-conversion module 7 have the same structure, and are used as main components of the telemetry transmitter, and are also key nodes that the telemetry transmitter is relatively prone to failure, and two identical structures are used to make a hardware backup, so as to increase the reliability of the device, and the function of the device is to generate a modulation signal through direct modulation. The output signals of the first up-conversion module 6 are all sent to the first receiving detection module 9 and the switch selection module 8, and the output signals of the second up-conversion module 7 are all sent to the second receiving detection module 10 and the switch selection module 8.
In embodiment 1 of the present invention, the first receiving and detecting module 9 completes down-conversion, receiving demodulation, bit synchronization and subframe synchronization on the output signal of the first up-conversion module 6, if the subframe synchronization can be completed normally, the working state of the first up-conversion module 6 is proved to be normal, otherwise, the working state of the first up-conversion module 6 is considered to be abnormal, and the detection result is fed back to the switch selecting module.
In embodiment 1 of the present invention, the second up-conversion module 7 adopts the same working principle as the first up-conversion module 6, and completes the working state inspection of the second up-conversion module 7 through the second receiving detection module 10, and feeds back the detection result to the switch selection module 8.
In embodiment 1 of the present invention, the switch selection module 8 performs 1-2 selection output on the modulated signals output by the first up-conversion module 6 and the second up-conversion module 7 according to the detection results of the first receiving detection module 9 and the second receiving detection module 10.
In embodiment 1 of the present invention, the hardware structures of the first power amplifier 11 and the second power amplifier 12 are the same, and are redundant backups, so that the reliability of the device is increased, and only part of energy is lost when one power amplifier fails, so that the function is not completely lost. The function of this is to power amplify the modulated signal output by the switch selection module 8 so that it is suitable for signal transmission via the antenna.
In embodiment 1 of the present invention, the code rate clock generating module 13 generates a corresponding code rate sampling clock according to the code rate parameter stored in the parameter storage module 14, so as to be used by the channel table reconstructing module 2.
In embodiment 1 of the present invention, the parameter storage module 14 is configured to store each configurable telemetry parameter, and in the use process, the customized configuration of the telemetry transmitter and the channel table reconstruction are completed through one-time parameter injection, and the next time the device is powered on, the device automatically reads the corresponding parameter from the parameter storage module 14 for other modules to use.
In embodiment 1 of the present invention, the DDR memory 15 is used to store the full frame channel map and to perform the delay channel storage processing.
The invention realizes the multimode reconfigurable high-reliability universal arrow-borne telemetry transmitter and has the following advantages.
1. The universality is good, a plurality of modulation modes and the reconfigurability of a channel table are supported, and the requirements of different tasks are met;
2. the state version of the telemetering transmitter is few, the production cost can be effectively reduced through batch production, and the economic benefit is improved;
3. the delivery cycle of the telemetry transmitter is greatly reduced, the shelf product delivery is truly realized, and the project management risk is reduced;
4. the system has a fault detection function, and is matched with the redundant backup of the key node to realize the high-reliability design of the product;
5. the performance parameters only need to be injected once, and the next power-on automatic loading is not needed to be configured each time.
Example 2
In the embodiment 2, the invention designs a universal arrow-mounted telemetry transmitter which can support multiple telemetry modulation modes and can reconstruct a telemetry channel table, can realize multitasking and universality and can realize the fastest periodic delivery of the telemetry transmitter in a goods shelf product mode. High reliability of the telemetry transmitter is ensured by employing redundant backup and fault detection.
The FPGA selects XC7Z035T-2FGG900I of Xilinx, the channel table reconstruction module 2, the channel code selection module 3, the code pattern selection module 4, the modulation mode selection module 5, the digital processing part in the first receiving detection module 9 and the second receiving detection module 10 and the code rate clock generation module 13 are all realized in the FPGA, the down conversion function of the first up conversion module 6 and the first receiving detection module 9 is realized by one AD9361, and the down conversion function of the second up conversion module 7 and the second receiving detection module 10 is realized by the other AD 9361. The model of the parameter storage module 14 is W25Q256, and the chip is a 256M flash memory, and the memory is used for storing configuration files, boot programs, executable programs and parameter information of the FPGA. The data acquisition module 1 is characterized in that part of analog quantity acquisition part is composed of a resistor attenuation network and a voltage follower through a conversion circuit, analog quantity telemetry parameters with different signal characteristics are uniformly converted into analog voltage signals which are matched with the range of an AD converter, the analog voltage signals are sent to an analog switch ADG1408 for time division multiplexing, and then the analog voltage signals are sent to a multichannel AD sampling chip ADS8638 chip to complete data sampling and are sent to an FPGA for processing. The switching light quantity signal is required to be transmitted to a voltage follower circuit after being isolated by an optical coupler, and an operational amplifier is an OP482 chip. The digital quantity input channel is realized by adopting an RS-422 isolation transceiver LTM2881 with an isolation function. The image input channel adopts an LVDS interface circuit, the interface chip adopts SN65LV1224B of TI company, and the serial communication rate is 100 Mbps-660 Mbps. Embodiment 2 is specifically implemented as shown in fig. 3.
After the transmitter is powered on, firstly, the configuration file (including a bootstrap program and an executable program) of the FPGA is read from the W25Q256, and then the telemetry parameters and the reconfigurable channel table information are read. The specific memory address allocation is shown in the following table. The size allocated to the reconfigurable channel table is 16M, the supported maximum subframe length is 65536, and the maximum subframe length is 256.
Content storage allocation table of W25Q256
The mapping relationship table instantiated in step 6 of the operation of the channel table reconstruction module 2 is as follows:
it should be noted that, in this embodiment, 96 analog channels, 8 switching channels, 4 digital channels and 2 image channels are designed, in order to increase reliability and robustness of the system, each channel HAs a corresponding delay channel, and the delay time can be customized by parameter injection, specifically, the implementation process is to store the acquired channel data into MT41K256M16HA, and complete data readout at the delay time meeting the parameter requirement by adopting a FIFO-like data storage and readout manner.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (5)
1. A multi-mode frame reconfigurable universal telemetry transmitter, characterized by: comprises a data acquisition module (1), a channel table reconstruction module (2), a channel coding selection module (3), a code pattern selection module (4), a modulation mode selection module (5), a first up-conversion module (6), a second up-conversion module (7), a switch selection module (8), a first receiving detection module (9), a second receiving detection module (10), a first power amplifier (11), a second power amplifier (12), a code rate clock generation module (13), a parameter storage module (14) and a DDR memory (15), wherein the channel table reconstruction module (2) is in signal connection with the data acquisition module (1), the channel coding selection module (3), the code rate clock generation module (13), the parameter storage module (14) and the DDR memory (15), the channel table reconstruction module (2) is also in signal connection with an external PC, the code rate clock generation module (13) and the parameter storage module (14) are in signal connection, the parameter storage module (14) is in signal connection with the input end of the code pattern selection module (4), the code pattern selection module (4) is also in signal connection with the channel coding selection module (3) output end, the code pattern selection module (5) is in signal connection with the code pattern selection module (5), the modulation mode selection module (5) is connected with the input end of the first up-conversion module (6) and the input end of the second up-conversion module (7) through equal signals, the modulation mode selection module (5) is also connected with the channel coding selection module (3) through signals, the output end of the first up-conversion module (6) is connected with the input end of the switch selection module (8) and the input end of the first receiving detection module (9) through equal signals, the output end of the second up-conversion module (7) is connected with the input end of the switch selection module (8) and the input end of the second receiving detection module (10) through equal signals, the input end of the switch selection module (8) is also connected with the output end of the first receiving detection module (9) and the output end of the second receiving detection module (10) through equal signals, and the output end of the switch selection module (8) is connected with the input end of the first power amplifier (11) and the input end of the second power amplifier (12) through equal signals; the first up-conversion module (6) and the second up-conversion module (7) have the same structure;
the hardware structures of the first power amplifier (11) and the second power amplifier (12) are the same, and are redundant backups;
the data acquisition module (1) comprises an analog quantity channel (101), a switching quantity channel (102), a digital quantity channel (103), an image channel (104) and an output channel (105), wherein the analog quantity channel (101), the switching quantity channel (102), the digital quantity channel (103) and the image channel (104) are all in signal connection with the output channel (105), and the output channel (105) is also in signal connection with the channel table reconstruction module (2);
the working method of the channel table reconstruction module (2) comprises the following steps:
a1, a telemetering transmitter is powered on to work, and a channel table reconstruction module (2) starts to work;
a2, the channel table reconstruction module (2) reads parameter information from the parameter storage module (14);
the parameter information comprises subframe length, subframe type, frame header length, frame header content, telemetry word length, subframe synchronization code and telemetry code rate;
a3, the channel table reconstruction module (2) calculates the full frame length according to the subframe length and the subframe length, and reads the full frame length data from the parameter storage module (14);
the calculation formula of the full frame length is as follows:
full frame length = subframe length x subframe length;
a4, storing the data read in the A3 into a DDR memory (15) for cyclic reading in the framing process of the channel table reconstruction module (2);
a5, generating a telemetry word sampling clock according to a PCM code sampling clock output by the code rate clock generation module (13) by combining the telemetry word length parameter read by the A2, wherein the expression of the telemetry word sampling clock is as follows:
wherein f b Representing the PCM code sampling clock, f B Representing a telemetry word sampling clock, B representing a telemetry word length;
a6 use f B Reading the full frame content in the DDR memory (15) as a clock cycle;
a7 use f b As clock to finish parallel-serial conversion to output the sampling clock of remote sensing word acquired by A6;
the channel table reconstruction module (2) has a channel table reconstruction function, and the channel table reconstruction function is realized, and comprises the following steps:
b1, completing hardware connection through a reconstruction instruction or a response interface by using a PC, powering up a telemetry transmitter, and starting a channel table reconstruction module (2);
b2, after the telemetry parameter group is framed, downloading the telemetry parameter group to a channel table reconstruction module (2) and storing the telemetry parameter group into a parameter storage module (14);
the telemetry parameters comprise subframe length, subframe type, frame header length, frame header content, telemetry word length, subframe synchronization code, telemetry code rate, channel coding type, code pattern and modulation type;
b3, waiting for response reply of the channel table reconstruction module (2), if the storage is successful, carrying out B4, otherwise, repeating the step B2;
b4, framing the channel table content in a sub-packet mode, downloading the frame to the channel table reconstruction module (2), completing data analysis by the channel table reconstruction module (2), and storing the data to an address corresponding to the parameter storage module (14);
b5, waiting for response reply of the channel table reconstruction module (2), if the storage is successful, carrying out B6, otherwise, repeating the step B4;
and B6, after all the channel table contents are stored, and the storage is successful, the telemetry transmitter is powered off and restarted, so that the channel table reconstruction function is completed.
2. The multi-mode frame reconfigurable universal telemetry transmitter of claim 1, wherein: the channel coding selection module (3) is used for reading parameters of the channel coding type from the parameter storage module (14) after the telemetering transmitter is powered on, so as to determine whether to perform channel coding on the binary code stream output by the channel table reconstruction module (2) and what kind of channel coding is performed;
the types of channel coding include TPC coding, LDPC coding, and Turbo coding.
3. The multi-mode frame reconfigurable universal telemetry transmitter of claim 1, wherein: the code pattern selection module (4) is used for reading the parameters of the code pattern from the parameter storage module (14) after the telemetering transmitter is powered on, so as to determine what type of baseband coding is carried out on the binary code stream output by the channel coding selection module (3);
the code pattern comprises a non-return-to-zero level code, a non-return-to-zero transmission number, a non-return-to-zero null number, a bidirectional level code, a bidirectional transmission number, a bidirectional null number, a differential bidirectional transmission number and a differential bidirectional null number.
4. The multi-mode frame reconfigurable universal telemetry transmitter of claim 1, wherein: the modulation mode selection module (5) is used for reading the parameters of the modulation type from the parameter storage module (14) after the telemetering transmitter is powered on, so as to determine what type of quadrature modulation is carried out on the baseband codes output by the code type selection module (4);
the modulation type includes CPFSK, BPSK, QPSK, OQPSK and MSK.
5. The multi-mode frame reconfigurable universal telemetry transmitter of claim 1, wherein: the switch selection module (8) carries out 2-1 selection output on the modulation signals output by the first up-conversion module (6) and the second up-conversion module (7) according to the detection results of the first receiving detection module (9) and the second receiving detection module (10).
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