CN109587398B - Satellite-borne short-wave infrared signal processing circuit and processing method - Google Patents
Satellite-borne short-wave infrared signal processing circuit and processing method Download PDFInfo
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- CN109587398B CN109587398B CN201811527809.4A CN201811527809A CN109587398B CN 109587398 B CN109587398 B CN 109587398B CN 201811527809 A CN201811527809 A CN 201811527809A CN 109587398 B CN109587398 B CN 109587398B
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- 238000003672 processing method Methods 0.000 title abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims abstract description 37
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000005070 sampling Methods 0.000 claims abstract description 4
- 239000013078 crystal Substances 0.000 claims description 8
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- 230000033764 rhythmic process Effects 0.000 claims description 3
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- 238000003331 infrared imaging Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/30—Transforming light or analogous information into electric information
- H04N5/33—Transforming infrared radiation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/118—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum specially adapted for satellite communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
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Abstract
The invention relates to a satellite-borne short-wave infrared signal processing circuit and a processing method, wherein the processing circuit comprises an analog video signal operational amplifier unit, an analog-to-digital conversion unit, an FPGA unit and an image data output unit, the analog video signal operational amplifier unit comprises an analog video interface and an analog operational amplifier, and the image data output unit comprises serial/deserializing transceivers TTLK2711 and TLK2711 for outputting physical interfaces; the analog operational amplifier comprises four operational amplifier units, and each operational amplifier unit correspondingly processes a pair of analog video signals in a differential mode; the analog-to-digital conversion unit adopts an ADDI7004 chip and is used for converting four pairs of differential analog video signals output by the analog operational amplifier into differential digital video signals and has a function of sampling and holding; the invention solves the problem that the current short-wave infrared signal is converted and transmitted from an analog signal to a digital signal, and can realize the short-wave infrared high-resolution imaging.
Description
Technical Field
The invention relates to digital conversion of an analog signal of a short-wave infrared detector and high-speed transmission of the digital signal, in particular to a satellite-borne short-wave infrared signal processing circuit and a processing method.
Background
With the development and progress of aerospace technology, satellite remote sensing has higher and higher requirements on ground resolution, swath width and the like; spectral imaging-based devices are increasingly exhibiting a trend towards high temporal, spatial and spectral resolution. Imaging devices also extend from the common visible spectrum to the short-wave infrared, medium-wave infrared, long-wave infrared, and other spectrum ranges.
The infrared imaging system is a system capable of detecting infrared radiation of a target and converting the infrared radiation of the target object into an image through means of photoelectric conversion, signal processing and the like. The infrared detector is the core of the imaging system, and fundamentally determines the development level of the infrared system, and an analog signal output by the infrared detector needs to be converted into a digital signal through proper signal processing.
The analog-digital conversion units used by the existing infrared processing circuit are mostly one-way or two-way processors, and the problems of large whole circuit scale, limited transmission bandwidth and poor noise immunity exist.
Disclosure of Invention
The invention provides a signal processing circuit and a signal processing method of a satellite-borne short wave infrared detector, which are used for solving the problems of large whole circuit scale, limited transmission bandwidth and poor noise resistance of the existing infrared processing circuit.
The technical scheme of the invention is as follows:
the utility model provides a star carries shortwave infrared signal processing circuit, includes analog video signal operational amplifier unit, analog-to-digital conversion unit, FPGA unit, FLASH memory cell, crystal oscillator unit and image data output unit, its characterized in that:
the analog video signal operational amplifier unit comprises an analog video interface and an analog operational amplifier, and the image data output unit comprises serial/deserializing transceivers TTLK2711 and TLK2711 output physical interfaces;
the analog operational amplifier receives an analog video signal in a differential form through an analog video interface and adjusts the output level of the analog video signal in the differential form so as to adapt to the input level requirement of the analog-to-digital conversion unit;
the analog operational amplifier comprises four operational amplifier units, and each operational amplifier unit correspondingly processes a pair of analog video signals in a differential mode; the input end of each operational amplifier unit is also provided with a resistor R1, the output end of each operational amplifier unit is also provided with a resistor R10, the resistor R1 is connected with the differential analog signal of the input end of the operational amplifier unit in parallel, and the resistor R10 is connected with the differential analog signal of the output end of the operational amplifier unit in parallel;
the analog-to-digital conversion unit adopts an ADDI7004 chip and is used for converting four pairs of differential analog video signals output by the analog operational amplifier into differential digital video signals and has a sampling and holding function;
the FLASH storage unit is connected with the FPGA unit; the crystal oscillator unit is connected with the FPGA unit;
the input end of the FPGA unit is connected with the output end of the analog-to-digital conversion unit, the output end of the FPGA unit is connected with the input end of the serial/deserializing transceiver TTLK2711, and the output end of the serial/deserializing transceiver TTLK2711 is connected with the TLK2711 output physical interface.
Further, the operational amplifier unit adopts an LMH6628 operational amplifier device.
Further, the model of the FPGA unit is XCR2V3000-4BG728. The FPGA of the model completely has the processing capacity of an infrared signal processing circuit by integrating a plurality of factors such as availability, cost performance, power consumption, stability, internal logic units and the like of the satellite-borne application device.
Further, the chip adopted by the FLASH memory unit is XCF16P. The storage unit has stable storage performance and sufficient storage space.
Further, the TLK2711 output physical interface is an MKHS connector.
Meanwhile, the invention also provides a signal processing method based on the satellite-borne short-wave infrared signal processing circuit, which is characterized by comprising the following steps of:
1) The analog video interface receives an analog video signal in a differential form;
2) The analog operational amplifier adjusts the output level of the analog video signal in a differential mode so as to adapt to the input level requirement of the analog-to-digital conversion unit;
3) The analog-to-digital conversion unit converts the analog video signal in the differential form output by the analog operational amplifier into a digital video signal in the differential form;
4) The FPGA unit receives the digital video signals in the serial differential form quantized by the analog-to-digital conversion unit, and the serial single bit digital video signals are converted into pixel-level parallel data with the bit depth of 14 bits by using the internal serial-to-parallel conversion unit;
5) The FPGA unit sequentially stores the digital video signals converted in the step 4) into an internal FIFO, and then the data stored in the FIFO are sent to the image data output unit according to a certain rhythm through the internal logic output unit;
6) The image data output unit outputs the received data through the high-speed serial/deserializing transceivers TLK2711 and TLK2711 output physical interfaces.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a satellite-borne short-wave infrared signal processing circuit, which provides an implementation structure for the design of the current high-resolution hyperspectral imaging circuit through the combination of an operational amplifier unit, a high-performance AD conversion circuit, an FPGA, a serial/deserializing transceiver TTLK2711 and a TLK2711 output physical interface, and the circuit has the following characteristics: the method is suitable for high-speed data transmission, and has the advantages of good signal-to-noise ratio, stable performance and the like. The signal processing circuit has wide application prospect and can be used for the following purposes: visible light CCD cameras, stereo mapping cameras, other industrial cameras and the like are used in a plurality of imaging devices needing AD quantification.
2. The satellite-borne short-wave infrared signal processing circuit is reasonable and reliable in design and can provide high-speed real-time data transmission with the bandwidth of 1.6 Gbps.
3. The satellite-borne short-wave infrared signal processing circuit has the advantages of compact structure, low power consumption and good noise resistance, and compared with the traditional single-path AD device, the high-performance 4-path AD device is adopted, so that resources are greatly saved, and the power consumption is reduced.
Drawings
FIG. 1 is a block diagram of a processing circuit for satellite-borne short-wave infrared signals according to an embodiment of the invention;
fig. 2 is a block diagram of a satellite-borne short-wave infrared signal processing circuit and an information flow diagram thereof according to an embodiment of the invention, wherein an analog video interface in an analog video signal operational amplifier unit is omitted in the block diagram;
FIG. 3 is a circuit diagram of a low noise operational amplifier of a short wave infrared signal processing circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples.
The embodiment of the invention is designed for a signal processing circuit of a satellite-borne short-wave infrared hyperspectral imager and comprises a high-speed data serial transmission mode.
The short-wave infrared signal processing circuit provided by the embodiment of the invention as shown in fig. 1 comprises an FPGA unit, a FLASH storage unit, an analog video signal operational amplifier unit, an analog-to-digital conversion unit, an image data output unit, a crystal oscillator unit, a power supply and distribution unit and the like.
(1) Analog video signal operational amplifier unit
The analog video signal operational amplifier unit is composed of an analog video interface and an analog operational amplifier, and has the main functions of performing operational amplifier processing on the analog video input by the detector and adjusting the output level value of the analog video signal operational amplifier unit so that the analog video signal operational amplifier unit meets the requirement of the analog signal input level of the analog-to-digital conversion unit.
Fig. 2 is a block diagram and an information flow diagram of an embodiment of the present invention, where an analog op-amp includes four op-amp units, each of which processes a pair of analog video signals in differential form.
Fig. 3 is a schematic diagram of a circuit structure of a single operational amplifier unit in a short-wave infrared signal processing circuit according to an embodiment of the present invention, and in order to improve noise immunity of an analog video in a transmission process, a short-wave infrared signal focal plane circuit at a front end of a detector outputs an analog signal by differential output. Each operational amplifier unit comprises two paths of amplifying circuits, and the two paths of amplifying circuits respectively process one differential signal in a pair of differential analog video signals so as to filter noise introduced in transmission. The invention adopts differential signal transmission before the analog signal enters the analog-digital conversion unit, has strong anti-interference capability, almost completely counteracts external common mode noise, counteracts electromagnetic fields of external radiation, and can effectively inhibit the influence of electromagnetic interference on effective analog image signals.
In the specific application implementation case, the analog video interface adopts a J14A connector produced by Zhengzhou space electronics company, and the operational amplifier unit adopts an LMH6628 operational amplifier device which has the characteristics of low noise and low temperature drift and is used for reducing the influence of noise and drift quantity introduced by the operational amplifier on useful signals. The analog video signal passes through the operational amplifier device LMH6628 to adjust the differential common mode level and the differential mode level to be within the range of the input level required by the analog-to-digital conversion unit.
In order to reduce noise introduced in the transmission process of the analog signal, the input end and the output end of the operational amplifier unit of the analog signal are respectively provided with a terminating resistor, R1 in the figure is positioned before the analog signal enters the operational amplifier, the analog signal is arranged close to LMH6628, the differential line in the circuit design is subjected to impedance control, the single end is grounded by 50Ω, and the differential pair is terminated with a parallel resistor R1 to take the value of 100deg.OMEGA. Meanwhile, an output differential parallel resistor R10 is arranged at the output end of the operational amplifier unit close to the end of the analog-to-digital conversion unit, and the value is 100 omega.
(2) Analog-to-digital conversion unit
The analog-to-digital conversion unit has the functions of converting an input infrared analog video signal into a digital signal, specifically in the embodiment, ADDI7004 produced by TI company is adopted, the device has the functions of sampling hold, gain adjustment and the like, and supports differential analog input, and the quantization bit number is 14 bits; the analog-to-digital conversion unit supports 4 paths of analog signal input and outputs 4 pairs of LVDS differential signals and 2 pairs of LVDS differential associated clock signals. The analog-to-digital conversion unit works by requiring the FPGA unit to provide control signals, working clocks, register configuration signals and the like.
(3) FPGA unit
The FPGA unit receives the digital video signals in the serial differential form which are quantized and input by the analog-to-digital conversion unit, and the serial single-bit digital signals are converted into pixel-level parallel data with the bit depth of 14 bits by using the internal serial-to-parallel conversion unit, namely 1 pixel output by the detector is converted into digital signals with the bit width of 14 bits. The FPGA sequentially stores the converted digital signals into the FIFO, and then sends the image data to the image data output unit according to a certain rhythm through the internal logic output unit.
Specifically, in a practical application case of the invention, an XILINX FPGA model is XCR2V3000-4BG728, and an internal serial-parallel conversion unit combines serial data sent by each path of analog-digital conversion unit into quantized 14bit parallel data; setting the bit width of 14 bits in the internal FIFO, and setting the bit depth according to the image size; the internal data output unit is used for fetching data in the FIFO and simultaneously sending 2 paths of control signals required by the TLK2711, namely TKLSB and TKMSB signals (the 2 paths of signals are used for indicating that the current data transmitted by the TLK2711 is K code or D code), and 1 path of working clock of 100Mhz and 14bit parallel data.
(4) Image data output unit
The image data output unit mainly comprises a high-speed serial/deserializing transceiver TLK2711 and a transmission physical interface thereof, and the function of the image data output unit is to transmit the image data quantized by the analog-to-digital conversion unit and processed by the FPGA to other special receiving equipment (such as an on-board special data transmission system or a ground special detection system). In the practical application case of the invention, 1 serial/deserializing transceiver TLK2711 is adopted, and 16 paths of parallel data signals, 1 path of clock signals and 2 paths of TLK2711 control signals (K code or D code) can be jointly encoded into 1 path of differential serial signals for output; the circuit adopts an Airborn company high-speed serial connector MKHS series connector as an external connector. The effective data of the 16bit parallel data line of the TLK2711 chip occupies the low 14bit, the high 2bit is idle, and the working clock is 100Mhz.
(5) FLASH memory cell
The FLASH memory unit is a nonvolatile and electrically erasable programmable read-only memory and is mainly used for providing program loading for starting the FPGA. Specifically, in this case, a special FLASH configuration chip XCF16P of Xilinx company is used.
(6) Crystal oscillator unit
The crystal oscillator provides a working clock for the FPGA and is a source clock for the whole board card. In particular, in the present case, a 100Mhz external crystal oscillator is used.
(7) Power supply and distribution unit
The power supply and distribution unit comprises a power interface connector and a plurality of power conversion chips, a plurality of types of power supplies are needed for the work of the whole circuit device, and the interface connector is a J14A series connector.
Fig. 4 is a schematic diagram showing connection of an application case of the present invention, in which an analog video differential output interface of a short-wave infrared focal plane circuit of a detector is connected with a short-wave infrared signal processing circuit of an embodiment of the present invention through a differential transmission cable, the short-wave infrared signal processing circuit of the embodiment of the present invention sequentially amplifies, analog-to-digital converts, and serial-parallel converts a received analog video signal in a differential form, and transmits the amplified analog video signal to an image data output unit, where the image data output unit outputs a serial signal and is connected to a ground detection device through the differential transmission cable.
Claims (6)
1. The utility model provides a star carries shortwave infrared signal processing circuit, includes analog video signal operational amplifier unit, analog-to-digital conversion unit, FPGA unit, FLASH memory cell, crystal oscillator unit and image data output unit, its characterized in that:
the analog video signal operational amplifier unit comprises an analog video interface and an analog operational amplifier, and the image data output unit comprises serial/deserializing transceivers TTLK2711 and TLK2711 output physical interfaces;
the analog operational amplifier receives an analog video signal in a differential form through an analog video interface and adjusts the output level of the analog video signal in the differential form so as to adapt to the input level requirement of the analog-to-digital conversion unit;
the analog operational amplifier comprises four operational amplifier units, each operational amplifier unit comprises two paths of amplifying circuits, and the two paths of amplifying circuits respectively process one differential signal in a pair of analog video signals in a differential mode; the input end of each operational amplifier unit is also provided with a resistor R1, the output end of each operational amplifier unit is also provided with a resistor R10, the resistor R1 is connected with the differential analog signal of the input end of the operational amplifier unit in parallel, and the resistor R10 is connected with the differential analog signal of the output end of the operational amplifier unit in parallel;
the analog-to-digital conversion unit adopts an ADDI7004 chip and is used for converting four pairs of differential analog video signals output by the analog operational amplifier into differential digital video signals and has a sampling and holding function;
the FLASH storage unit is connected with the FPGA unit; the crystal oscillator unit is connected with the FPGA unit;
the input end of the FPGA unit is connected with the output end of the analog-to-digital conversion unit, the output end of the FPGA unit is connected with the input end of the serial/deserializing transceiver TTLK2711, and the output end of the serial/deserializing transceiver TTLK2711 is connected with the TLK2711 output physical interface.
2. The on-board short wave infrared signal processing circuit of claim 1, wherein:
the operational amplifier unit adopts an LMH6628 operational amplifier device.
3. The on-board short wave infrared signal processing circuit according to claim 1 or 2, wherein:
the model of the FPGA unit is XCR2V3000-4BG728.
4. The on-board short wave infrared signal processing circuit of claim 3, wherein:
the chip adopted by the FLASH memory unit is XCF16P.
5. The on-board short wave infrared signal processing circuit of claim 4, wherein:
the TLK2711 output physical interface is an MKHS connector.
6. A method for signal processing based on a satellite-borne short wave infrared signal processing circuit according to any one of claims 1 to 5, comprising the steps of:
1) The analog video interface receives an analog video signal in a differential form;
2) The analog operational amplifier adjusts the output level of the analog video signal in a differential mode so as to adapt to the input level requirement of the analog-to-digital conversion unit;
3) The analog-to-digital conversion unit converts the analog video signal in the differential form output by the analog operational amplifier into a digital video signal in the differential form;
4) The FPGA unit receives the digital video signals in the serial differential form quantized by the analog-to-digital conversion unit, and converts the serial single-bit digital video signals into pixel-level parallel data with the bit depth of 14 bits by using the internal serial-to-parallel conversion unit;
5) The FPGA unit sequentially stores the digital video signals converted in the step 4) into an internal FIFO, and then the data stored in the FIFO are sent to the image data output unit through the internal logic output unit according to a certain rhythm;
6) The image data output unit converts the received data into serial data through the high-speed serial/deserializing transceiver TLK2711 and outputs the serial data through the TLK2711 output physical interface.
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