CN110855300B - Satellite-borne radiometer digital intermediate frequency receiver - Google Patents
Satellite-borne radiometer digital intermediate frequency receiver Download PDFInfo
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- CN110855300B CN110855300B CN201911120953.0A CN201911120953A CN110855300B CN 110855300 B CN110855300 B CN 110855300B CN 201911120953 A CN201911120953 A CN 201911120953A CN 110855300 B CN110855300 B CN 110855300B
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- H—ELECTRICITY
- 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
- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
- H04B1/0007—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at radiofrequency or intermediate frequency stage
- H04B1/001—Channel filtering, i.e. selecting a frequency channel within the SDR system
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- H—ELECTRICITY
- 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
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/1638—Special circuits to enhance selectivity of receivers not otherwise provided for
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L2025/03433—Arrangements for removing intersymbol interference characterised by equaliser structure
- H04L2025/03535—Variable structures
- H04L2025/03541—Switching between domains, e.g. between time and frequency
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Abstract
The invention discloses a satellite-borne radiometer digital intermediate frequency receiver, which comprises: the analog-to-digital converter is used for converting received analog intermediate frequency signals into digital signals, and the static random access memory type field programmable gate array is used for processing the digital signals as follows: shunting and reducing speed; multi-channel signals are synchronously processed to realize high-speed parallel down conversion; filtering; square detection; and receiving the frequency domain signal, selecting a required frequency point according to the requirement, directly acquiring signal energy on the frequency domain, and summing and outputting. The invention uses multi-phase structure and multi-path parallel processing to achieve equivalent high-speed processing effect and meet the requirements of modern scientific research observation on frequency band division.
Description
Technical Field
The invention relates to the technical field of digital receivers, in particular to a satellite-borne radiometer-based digital intermediate frequency receiver.
Background
The microwave radiometer has wide application, is usually applied to a satellite-borne platform in the aspect of ground detection, and simultaneously has higher and higher requirements on technical performance of the radiometer due to scientific research requirements, for example, a tiny frequency band difference may reflect information of atmosphere with different heights, the frequency band division cannot be realized by using a traditional simulation mode generally, a processing technology is required to process broadband signals, and the frequency band subdivision is carried out on the broadband signals so as to meet technical requirements.
The processing technology can overcome the defects of a plurality of analog circuits, has stronger anti-interference capability but limited operation speed, structurally, the microwave radiometer is a high-sensitivity receiver, the sensitivity can be improved by increasing the bandwidth of signals received by the radiometer as well as improving the receiving integration time of the radiometer, the high-speed digital receiving and the processing and calculation of broadband data become difficult points, and the field programmable gate array is generally used for processing. And an equivalent low-speed parallel processing structure is used, so that the processing speed is increased on the whole.
Under a satellite-borne environment, the space environment is severe, a high-performance field programmable gate array is usually configured based on a static random access memory at present, and if the high-performance field programmable gate array is influenced by space radiation and loses functions after power failure, a high-reliability control unit and a high-reliability memory are needed to be used for configuring and refreshing the field programmable gate array for digital operation which is possibly influenced by the space radiation.
Disclosure of Invention
The invention provides a design of a satellite-borne radiometer digital intermediate frequency receiver, which can realize the processing of broadband analog intermediate frequency signals and can deal with space radiation in a satellite-borne environment.
In order to solve the above problem, the present invention provides a spaceborne radiometer digital intermediate frequency receiver, comprising: the analog-to-digital converter is used for converting a received analog intermediate frequency signal into a digital signal and sending the digital signal to the static random access memory type field programmable gate array; the static random access memory type field programmable gate array comprises a shunt speed reduction module, a digital down-conversion module, a multiphase filter, a digital detector, a fast Fourier transform module, a frequency domain channel respective summation module and a mode integration module, wherein the digital signals are output after being processed by the shunt speed reduction module, the digital down-conversion module, the multiphase filter, the digital detector, the fast Fourier transform module, the frequency domain channel respective summation module and the mode integration module in sequence, and the shunt speed reduction module performs shunt speed reduction processing on the digital signals; the digital down-conversion module synchronously processes a plurality of paths of signals to realize high-speed parallel down-conversion; the polyphase filter filters the received signal; the digital detector carries out square detection by using a squaring method; and the frequency domain channels respectively receive the frequency domain signals, select the required frequency points according to the requirements, directly acquire signal energy on the frequency domain, and sum and output the signal energy.
The fast Fourier transform module transforms a time domain signal into a frequency domain signal;
the frequency domain channel respective summation module divides channels on a frequency domain by selecting points according to the Pasteval theorem, and respectively sums to obtain energy values;
and the mode integration module selects the integration time length according to different modes and frames and packs and outputs the result.
Preferably, the system further comprises an antifuse-type field programmable gate array, and the antifuse-type field programmable gate array performs program configuration on the static random access memory-type field programmable gate array according to a configuration file.
Preferably, the system further comprises a nonvolatile memory, wherein the configuration file is stored in the nonvolatile memory, and the antifuse-type field programmable gate array reads the configuration file from the nonvolatile memory.
Preferably, the non-volatile memory is a magnetic random access memory.
Preferably, the sampling rate of the analog-to-digital converter is more than 2 times of the signal bandwidth.
Compared with the prior art, the invention has the following effects:
1. the software design of the embodiment of the invention considers the disadvantage of limited arithmetic speed of the digital circuit, and uses a multi-phase structure and multi-path parallel processing to achieve equivalent high-speed processing effect; different technical indexes mainly adjust an analog-digital converter part and software, the inheritance cost of the software is relatively low, and the software is suitable for application of various radiometers;
2. the digital intermediate frequency receiver provided by the embodiment of the invention has a reasonable structure and meets the requirements of modern scientific research observation on frequency band division;
3. the hardware design of the embodiment of the invention gives consideration to the high-performance processing requirement and the viability in the space environment, and has certain universality.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. In the drawings:
fig. 1 is a schematic structural diagram of a spaceborne radiometer digital intermediate frequency receiver according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings, which are implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments, and those skilled in the art can modify and retouch the present invention without changing the spirit and content of the present invention.
The satellite-borne radiometric Digital intermediate frequency receiver adopts a high-speed Analog-to-Digital Converter (ADC) on a satellite platform to sample a received Analog intermediate frequency signal, adopts a high-performance Field Programmable Gate Array (FPGA) to perform Digital signal processing, adopts Digital filters, Fourier transform and other modes to select channel frequency points, adopts an accumulator to perform integral summation on energy in a channel, and realizes more precise frequency band processing compared with the Analog receiver; meanwhile, a high-reliability antifuse-type FPGA and a Magnetic Random Access Memory (MRAM) are adopted to configure and refresh the high-performance FPGA for operation so as to adapt to a space radiation environment and realize higher reliability in the space environment; the satellite borne radiometer digital intermediate frequency receiver can be widely applied to various satellite borne radiometers.
Referring to fig. 1, the on-board radiometer digital intermediate frequency receiver includes: an analog-to-digital converter 100, a static random memory type field programmable gate array 200, and an antifuse type field programmable gate array 300, in which,
the analog-to-digital converter 100 is configured to convert the received analog intermediate frequency signal into a digital signal, and send the digital signal to the static random access memory type field programmable gate array 200;
specifically, the sampling rate of the analog-to-digital converter 100 is more than 2 times of the signal bandwidth, the analog-to-digital converter 100 samples the broadband signal, the data bandwidth is 400MHz, the sampling rate is 1GHz, and the broadband signal is transmitted to the static random access memory type field programmable gate array 200 by using a high-speed parallel differential line;
the static random access memory type field programmable gate array 200 processes the digital signal;
in this embodiment, the sram fpga 200 includes a de-speeding module 210, a first parallel down-conversion module 220, a second parallel down-conversion module 230, a first polyphase filter 240, a second polyphase filter 250, a digital detection module (not shown), a de-speeding summing module 260, a fast fourier transform module 270, a frequency domain channel sum-separately module 280, and a mode integration module 290, and the digital signals are sequentially processed and output by the de-speeding module 210, the first parallel down-conversion module 220, the second parallel down-conversion module 230, the first polyphase filter 240, the second polyphase filter 250, the digital detection module (not shown), the de-speeding module 260, the fast fourier transform module 270, the frequency domain channel sum-separately module 280, and the mode integration module 290, wherein,
the shunt slowdown module 210 divides the 500MHz signals of the analog-to-digital converter 100 into two paths and then divides the signals into 1 to 2, divides the data with the 1GHz sampling rate into 4 paths of 250MHz parallel data, and achieves the processing rate range which can be accepted by the static random access memory type field programmable gate array 200;
the first parallel down-conversion module 220 and the second parallel down-conversion module 230 generate parallel high-speed local oscillation signals by changing the local oscillation signals of the serial frequency points of 1 path into parallel 4 paths, so as to complete high-speed parallel down-conversion;
the first polyphase filter 240 and the second polyphase filter 250 use a polyphase structure to extract and split the coefficients of the high-order digital filter into filter banks of 4 filters, 4 paths of filtering are respectively performed, and the shunting and summing module 260 sums the output signals to realize high-speed parallel filtering;
the digital detection module is used for solving the envelope of the signal and carrying out square detection by using a squaring method;
the fast fourier transform module 270 is a linear integral transform, and can also split multiple paths for parallel processing to transform a time domain signal into a frequency domain signal;
the frequency domain channel respectively summing module 280, according to the paseuler theorem, the energy of the signal in the time domain is consistent with the energy of the signal in the frequency domain, and the radiometer only needs to obtain the energy value, so that the frequency domain signal after the fast fourier transform module 270 can be directly divided into channels at selected points in the frequency domain according to the index requirement, and the channels are respectively summed to obtain the energy value;
the mode integration module 290 is controlled by an external OC command and an RS422 signal, combines the integration of shorter time into integration of longer time required by an index, can select the integration time length according to different modes, adapts to the application of different circular scanning rates, and finally frames and packs the result, and outputs the result to the next stage through the RS422 synchronous serial port 530.
As a preferred embodiment, the antifuse-type field programmable gate array 300 performs program configuration on the static random access memory-type field programmable gate array 200 according to a configuration file, wherein the configuration file is stored in the nonvolatile memory 400, and the antifuse-type field programmable gate array 300 reads the configuration file from the nonvolatile memory 400, and preferably, the nonvolatile memory 400 adopts a magnetic random access memory, so that the influence of single-particle upset on a program stored in the device in an immune space environment can be avoided.
While the invention has been described with reference to specific embodiments, the application is not limited thereto, and any variations that may be suggested to one skilled in the art are intended to fall within the scope of the application.
Claims (5)
1. A spaceborne radiometric digital intermediate frequency receiver, comprising: analog-to-digital converters and field programmable gate arrays of the static random access memory type, in which,
the analog-to-digital converter is used for converting the received analog intermediate frequency signal into a digital signal and sending the digital signal to the static random access memory type field programmable gate array;
the static random access memory type field programmable gate array comprises a shunt deceleration module, a digital down-conversion module, a multiphase filter, a digital detector, a fast Fourier transform module, a frequency domain channel respective summation module and a mode integration module, wherein the digital signal is output after being processed by the shunt deceleration module, the digital down-conversion module, the multiphase filter, the digital detector, the fast Fourier transform module, the frequency domain channel respective summation module and the mode integration module in sequence,
the shunt speed reduction module performs shunt speed reduction processing on the digital signal;
the digital down-conversion module synchronously processes a plurality of paths of signals to realize high-speed parallel down-conversion;
the polyphase filter filters the received signal;
the digital detector carries out square detection by using a squaring method;
the frequency domain channels respectively receive the frequency domain signals, select required frequency points according to requirements, directly acquire signal energy on the frequency domain, and sum and output the signal energy;
the fast Fourier transform module transforms a time domain signal into a frequency domain signal;
the frequency domain channel respective summation module divides channels on a frequency domain by selecting points according to the Pasteval theorem, and respectively sums to obtain energy values;
and the mode integration module selects the integration time length according to different modes and frames and packs and outputs the result.
2. The on-board radiometric digital intermediate frequency receiver of claim 1, further comprising an antifuse-type field programmable gate array, which program configures the static random access memory-type field programmable gate array according to a configuration file.
3. The on-board radiometric digital intermediate frequency receiver of claim 2, further comprising a non-volatile memory, said configuration file being stored in said non-volatile memory, said antifuse-type field programmable gate array reading said configuration file from said non-volatile memory.
4. A spaceborne radiometric digital intermediate frequency receiver according to claim 3, wherein said non-volatile memory is a magnetic random access memory.
5. The on-board radiometric digital intermediate frequency receiver of claim 1, wherein a sampling rate of said analog-to-digital converter is greater than 2 times a signal bandwidth.
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| CN108768442A (en) * | 2018-04-08 | 2018-11-06 | 上海航天测控通信研究所 | A kind of highly reliable generalization answering machine IF process machine |
| CN109613536A (en) * | 2019-01-11 | 2019-04-12 | 中国电子科技集团公司第三十八研究所 | A kind of satellite-borne SAR real-time processing device and method |
| CN110224740A (en) * | 2019-06-06 | 2019-09-10 | 上海航天测控通信研究所 | Link terminal IF process machine |
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| CN108768442A (en) * | 2018-04-08 | 2018-11-06 | 上海航天测控通信研究所 | A kind of highly reliable generalization answering machine IF process machine |
| CN109613536A (en) * | 2019-01-11 | 2019-04-12 | 中国电子科技集团公司第三十八研究所 | A kind of satellite-borne SAR real-time processing device and method |
| CN110224740A (en) * | 2019-06-06 | 2019-09-10 | 上海航天测控通信研究所 | Link terminal IF process machine |
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