CN209419713U - A kind of spaceborne short-wave infrared signal processing circuit - Google Patents
A kind of spaceborne short-wave infrared signal processing circuit Download PDFInfo
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- CN209419713U CN209419713U CN201822094916.4U CN201822094916U CN209419713U CN 209419713 U CN209419713 U CN 209419713U CN 201822094916 U CN201822094916 U CN 201822094916U CN 209419713 U CN209419713 U CN 209419713U
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Abstract
The utility model relates to a kind of spaceborne short-wave infrared signal processing circuits, including analog video signal amplifier unit, AD conversion unit, FPGA unit and image data-outputting unit, analog video signal amplifier unit includes analog video interface and simulation amplifier, and image data-outputting unit includes that serial/unstring transceiver TTLK2711 and TLK2711 exports physical interface；Simulating amplifier includes four amplifier units, the analog video signal of each amplifier unit alignment processing a pair of difference form；AD conversion unit uses ADDI7004 chip, for the analog video signal for simulating four pairs of difference forms that amplifier is exported to be converted to the digital video signal of difference form, and has the function that sampling is kept；The utility model solves current short-wave infrared signal by the conversion and transmission of analog signal to digital signal, can be realized short-wave infrared high-resolution imaging.
Description
Technical field
The utility model relates to the digitlization conversion of short-wave infrared detector simulation signal and the high speed biographies of digital signal
It is defeated, and in particular to a kind of spaceborne short-wave infrared signal processing circuit.
Background technique
With the development of space technology with progress, satellite remote sensing requires ground resolution, swath width etc. higher and higher；
The development that equipment based on light spectrum image-forming increasingly shows high time resolution, high spatial resolution and high spectral resolution becomes
Gesture.Imaging device is also expanded from common visible spectrum to spectral coverages such as short-wave infrared, medium-wave infrared, LONG WAVE INFRAREDs.
Infrared imaging system is a kind of detectable Target Infrared Radiation, by means such as photoelectric conversion, signal processings, by mesh
The system that the infra-red radiation of mark object is converted into image.Infrared detector is the core of imaging system, is fundamentally decide red
The analog signal of the development level of external system, output needs to be converted to digital signal by signal processing appropriate.
AD conversion unit used in existing infrared processing circuit is mostly all the way or two path processors that there are whole electricity
Road is larger, transmission bandwidth is limited and the problem of noise resisting ability difference.
Summary of the invention
In order to solve that existing infrared processing circuit integrated circuit is larger, transmission bandwidth is limited and noise resisting ability difference
Problem, the utility model provide a kind of spaceborne short-wave infrared detector signal processing circuit.
The technical solution of the utility model is:
A kind of spaceborne short-wave infrared signal processing circuit, including analog video signal amplifier unit, AD conversion unit,
FPGA unit, FLASH storage unit, crystal oscillator unit and image data-outputting unit, are characterized in that
The analog video signal amplifier unit includes analog video interface and simulation amplifier, and the output of described image data is single
Member includes that serial/unstring transceiver TTLK2711 and TLK2711 exports physical interface；
The simulation amplifier receives the analog video signal of difference form by analog video interface, and adjusts difference form
Analog video signal output level, to adapt to the incoming level requirement of AD conversion unit；
The simulation amplifier includes four amplifier units, the simulation of each amplifier unit alignment processing a pair of difference form
Vision signal；The input terminal of each amplifier unit is additionally provided with resistance R1, and the output end of each amplifier unit is additionally provided with resistance
R10, the resistance R1 is in parallel with the differential analog signal of amplifier unit input terminal, the resistance R10 and amplifier unit output end
Differential analog signal it is in parallel；
The AD conversion unit uses ADDI7004 chip, for that will simulate four pairs of difference forms that amplifier is exported
Analog video signal is converted to the digital video signal of difference form, and has the function that sampling is kept；
The FLASH storage unit is connect with FPGA unit；The crystal oscillator unit is connect with FPGA unit；
The output end of the input terminal of the FPGA unit and AD conversion unit connects, the output end of the FPGA unit with
The connection of the serially/transceiver TTLK2711 that unstrings input terminal, the output end of described serial/transceiver TTLK2711 that unstrings with
TLK2711 exports physical interface connection.
Further, the amplifier unit uses LMH6628 amplifier device.
Further, the model XCR2V3000-4BG728 of the FPGA unit.Comprehensive spaceborne application device obtains
Factors, the FPGA of the model such as property, cost performance, power consumption, stability, internal logic unit is obtained to have at infrared signal completely
Manage the processing capacity of circuit.
Further, chip used by the FLASH storage unit is XCF16P.The storage unit storage performance is steady
Fixed, memory space is sufficient.
Further, the TLK2711 output physical interface is MKHS connector.
Meanwhile the utility model additionally provides and carries out signal processing based on above-mentioned spaceborne short-wave infrared signal processing circuit
Method, be characterized in that, comprising the following steps:
1) analog video interface receives the analog video signal of difference form；
2) simulation amplifier adjusts the output level of the analog video signal of difference form, to adapt to the defeated of AD conversion unit
Enter level demand；
3) analog video signal for simulating the difference form that amplifier is exported is converted to difference form by AD conversion unit
Digital video signal；
4) FPGA unit receives the digital video signal of the serial differential form after AD conversion unit quantization, and in use
Portion's serioparallel exchange unit completes the parallel data that serial list bit digital video signal is converted to the Pixel-level of 14bit locating depth；
5) digital video signal after step 4) conversion is successively stored into internal FIFO by FPGA unit, then by interior
The data being stored in FIFO are sent to image data-outputting unit according to certain rhythm by portion's logic output unit；
6) image data-outputting unit by received data by high speed serialization/unstring transceiver TLK2711 and
TLK2711 exports physical interface output.
Compared with prior art, beneficial effect is the utility model:
1, spaceborne short-wave infrared signal processing circuit provided by the utility model, passes through amplifier unit, high-performance AD conversion
The combination of circuit, FPGA, serial/transceiver TTLK2711 and TLK2711 the output physical interface that unstrings, is current high-resolution bloom
Spectrum imaging circuit design provides a kind of realization structure, which has the following characteristics that applicable high speed data transfer, signal-to-noise ratio
Many advantages, such as good, performance is stablized.The signal processing circuit is with a wide range of applications, and may be also used in such as: Visible-light CCD
In many imaging class equipment for needing to carry out AD quantization such as camera, tridimensional mapping camera, other industrial cameras.
2, the spaceborne short-wave infrared signal processing circuit design of the utility model is reasonable, reliable, it is possible to provide 1.6Gbps bandwidth
High-speed real-time transmission.
3, the spaceborne short-wave infrared signal processing circuit structure of the utility model is compact, low in energy consumption, antinoise is good, uses height
4 road AD device of performance has greatly saved resource, has reduced power consumption compared with traditional single channel AD device.
Detailed description of the invention
Fig. 1 is the spaceborne short-wave infrared signal processing circuit composition block diagram of the utility model embodiment；
Fig. 2 show the structure chart and its information flow of the spaceborne short-wave infrared signal processing circuit of the utility model embodiment
Scheme, analog video interface in analog video signal amplifier unit is omitted in the figure；
Fig. 3 is the utility model embodiment short-wave infrared signal processing circuit low-noise operational amplifier circuit diagram；
Fig. 4 is the utility model application case connection schematic diagram.
Specific embodiment
The utility model is described in detail combined with specific embodiments below.
The utility model embodiment is designed for a kind of spaceborne short-wave infrared hyperspectral imager signal processing circuit,
It and include high-speed data serial transmission mode.
Short-wave infrared signal processing circuit provided by the embodiment of the utility model as shown in Figure 1 includes FPGA unit, FLASH
Storage unit, analog video signal amplifier unit, AD conversion unit, image data-outputting unit, crystal oscillator unit, power supply and distribution list
Member etc..
(1) analog video signal amplifier unit
Analog video signal amplifier unit is made of analog video interface and simulation amplifier, and major function is by detector
It inputs analog video and carries out amplifier processing, the level value of its output is adjusted, so that it meets AD conversion unit to analog signal
The requirement of incoming level.
Fig. 2 show the structure chart and its information flow chart of the utility model embodiment, and simulation amplifier includes four amplifier lists
Member, the analog video signal of each amplifier unit alignment processing a pair of difference form.
Fig. 3 show the circuit structure of single amplifier unit in the utility model embodiment short-wave infrared signal processing circuit
Schematic diagram, in order to improve noise immunity of the analog video in transmission process, the short-wave infrared signal focal plane circuit of detector front end
It exports analog signal and uses difference output.Each amplifier unit includes two-way amplifying circuit, two-way amplifying circuit respectively with a pair
A differential signal is handled in the analog video signal of difference form, to filter out the noise introduced in transmission.This is practical new
Type is all made of differential signal transmission before analog signal enters AD conversion unit, and strong antijamming capability, external common-mode noise is almost
It can be completely counterbalanced by, cancel out each other to the electromagnetic field of external radiation, can effectively inhibit electromagnetic interference to effective analog picture signal
Influence.
In concrete application case study on implementation, analog video interface uses the J14A connector of Zhengzhou aerospace electron company production,
Amplifier unit selects LMH6628 amplifier device, which has low noise, low excursion with temperature characteristic, introduces to reduce amplifier
The influence to useful signal of noise and drift value.Analog video signal passes through amplifier device LMH6628 for difference common mode electrical level
It adjusts with differential mode level to incoming level needed for AD conversion unit.
In order to reduce the noise introduced during analog signal transmission, input terminal and output of the analog signal in amplifier unit
End devises terminating resistor, and R1 is located at before analog signal enters amplifier in figure, is arranged close to LMH6628, difference in circuit design
Line has carried out impedance control, single-ended 50 Ω over the ground, and differential pair terminates 100 Ω of parallel resistance R1 value.It is defeated in amplifier unit simultaneously
Outlet arranges output difference parallel resistance R10,100 Ω of value close to AD conversion unit end.
(2) AD conversion unit
The function of AD conversion unit is that the infrared simulation vision signal of input is converted to digital signal, specific to this reality
It applies in case, using the ADDI7004 that TI company produces, which has the function of to sample holding, gain adjustment etc., and it is poor to support
Divide simulation input, quantization digit 14bit；The AD conversion unit supports the input of 4 tunnel analog signals, exports 4 pairs of LVDS difference letters
Number and 2 pairs of LVDS difference channel associated clock signals.When AD conversion unit work needs FPGA unit to provide control signal, work
Clock, register configuration signal etc..
(3) FPGA unit
FPGA unit receives the digital video signal of the serial differential form inputted after AD conversion unit quantization, and uses
Internal serioparallel exchange unit completes the parallel data that serial list bit digital signal is converted to the Pixel-level of 14bit locating depth, also
It is that 1 pixel of detector output is converted to the digital signal of 14bit bit wide.FPGA successively stores the digital signal after conversion
Enter FIFO, then by internal logic output unit, image data is sent to image data-outputting unit according to certain rhythm.
Specific in one practical application example of the utility model, Xilinx company FPGA model has been selected
XCR2V3000-4BG728, internal serioparallel exchange unit are the serial data group amounts of being combined into for issuing every road AD conversion unit
Change the parallel data of 14bit；Bit wide 14bit is arranged in internal FIFO, and locating depth is specifically set according to image size；Internal data output
Unit is used to that data in FIFO are taken out to and sent simultaneously the control of 2 tunnels needed for TLK2711 signal, and respectively TKLSB, TKMSB believes
Number (the 2 road signal be used to refer to TLK2711 transmission current data be K code or D code) and 1 road 100Mhz work clock,
14bit parallel data.
(4) image data-outputting unit
Image data-outputting unit mainly includes high speed serialization/unstring transceiver TLK2711 and its transmitting physical interface,
Its function is that the image data after quantifying AD conversion unit and by FPGA processing is sent to other dedicated receiving devices (such as
Dedicated Data transfer system or ground dedicated test system on star).Specific to the utility model practical application example, 1 string is used
Go/unstring transceiver TLK2711,16 channel parallel data signals, 1 tunnel clock signal, 2 road TLK2711 can be controlled signal (K code
Or D code) it is encoded to the output of 1 road differential serial signals jointly；Circuit external connector is connected using Airborn company high speed serialization
Device MKHS series connector.The 16bit parallel data line valid data of TLK2711 chip occupy low 14bit, and high-order 2bit is empty
Spare time, work clock 100Mhz.
(5) FLASH storage unit
FLASH storage unit is a kind of non-volatile, electrically erasable programmable read-only memory, is mainly used to open for FPGA
It is dynamic that program load is provided.Specific to present case, the dedicated FLASH configuration chip XCF16P of Xilinx company has been used.
(6) crystal oscillator unit
Crystal oscillator provides work clock for FPGA, is the source clock of entire board work.Specific to present case, use
100Mhz external crystal-controlled oscillation.
(7) power supply and distribution unit
Power supply and distribution unit includes power interface connector, several pieces power conversion chips, is provided for the work of entire circuit devcie
The power supply of required multiple types, interface connector select J14A series connector.
Fig. 4 show the utility model application case connection schematic diagram, the simulation of the short-wave infrared focal plane circuit of detector
Video difference output interface is connected by the short-wave infrared signal processing circuit of differential transfer cable and the utility model embodiment,
The short-wave infrared signal processing circuit of the utility model embodiment to received difference form analog video signal successively into
Row amplification, analog-to-digital conversion, serioparallel exchange are transmitted to image data-outputting unit, and image data-outputting unit exports serial signal simultaneously
Ground checkout equipment is connected by differential transfer cable.
Claims (5)
1. a kind of spaceborne short-wave infrared signal processing circuit, including analog video signal amplifier unit, AD conversion unit, FPGA
Unit, FLASH storage unit, crystal oscillator unit and image data-outputting unit, it is characterised in that:
The analog video signal amplifier unit includes analog video interface and simulation amplifier, described image data outputting unit packet
It includes serial/unstring transceiver TTLK2711 and TLK2711 and exports physical interface；
The simulation amplifier receives the analog video signal of difference form by analog video interface, and adjusts the mould of difference form
The output level of quasi- vision signal, to adapt to the incoming level requirement of AD conversion unit；
The simulation amplifier includes four amplifier units, the analog video of each amplifier unit alignment processing a pair of difference form
Signal；The input terminal of each amplifier unit is additionally provided with resistance R1, and the output end of each amplifier unit is additionally provided with resistance R10,
The resistance R1 is in parallel with the differential analog signal of amplifier unit input terminal, the difference of the resistance R10 and amplifier unit output end
Divide analog signal in parallel；
The AD conversion unit uses ADDI7004 chip, for that will simulate the simulation for four pairs of difference forms that amplifier is exported
Vision signal is converted to the digital video signal of difference form, and has the function that sampling is kept；
The FLASH storage unit is connect with FPGA unit；The crystal oscillator unit is connect with FPGA unit；
The input terminal of the FPGA unit and the output end of AD conversion unit connect, the output end and string of the FPGA unit
Go/unstring the input terminal connection of transceiver TTLK2711, the output end of described serial/transceiver TTLK2711 that unstrings with
TLK2711 exports physical interface connection.
2. spaceborne short-wave infrared signal processing circuit according to claim 1, it is characterised in that:
The amplifier unit uses LMH6628 amplifier device.
3. spaceborne short-wave infrared signal processing circuit according to claim 1 or 2, it is characterised in that: the FPGA unit
Model XCR2V3000-4BG728.
4. spaceborne short-wave infrared signal processing circuit according to claim 3, it is characterised in that: the FLASH storage is single
Chip used by member is XCF16P.
5. spaceborne short-wave infrared signal processing circuit according to claim 4, it is characterised in that: the TLK2711 output
Physical interface is MKHS connector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822094916.4U CN209419713U (en) | 2018-12-13 | 2018-12-13 | A kind of spaceborne short-wave infrared signal processing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822094916.4U CN209419713U (en) | 2018-12-13 | 2018-12-13 | A kind of spaceborne short-wave infrared signal processing circuit |
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| CN209419713U true CN209419713U (en) | 2019-09-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109587398A (en) * | 2018-12-13 | 2019-04-05 | 中国科学院西安光学精密机械研究所 | A kind of spaceborne short-wave infrared signal processing circuit and processing method |
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2018
- 2018-12-13 CN CN201822094916.4U patent/CN209419713U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109587398A (en) * | 2018-12-13 | 2019-04-05 | 中国科学院西安光学精密机械研究所 | A kind of spaceborne short-wave infrared signal processing circuit and processing method |
| CN109587398B (en) * | 2018-12-13 | 2023-12-08 | 中国科学院西安光学精密机械研究所 | Satellite-borne short-wave infrared signal processing circuit and processing method |
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