CN204085701U - Integrated spaceborne super long alignment infrared eye front-end information acquisition cuicuit - Google Patents
Integrated spaceborne super long alignment infrared eye front-end information acquisition cuicuit Download PDFInfo
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Abstract
This patent discloses a kind of integrated spaceborne long line series infrared detector front-end information acquisition cuicuit.This patent is optimized long detector array front end signal link, adopts every 8 passages to be that 1 front end unit module carries out integrated method for designing, can process super long alignment infrared eye signal by multiple front end unit module; And transferring front end analogue unit to asic chip, each chip can complete the process overall process of 8 infrared eye signal from analog front ends, road to digital quantization.Spaceborne super long alignment infrared eye front end signal low noise, high bandwidth, high sampling rate, hyperchannel, small size, lightweight, low-power consumption, high electrical-magnetic compatibility, High Reliability Design technical barrier is efficiently solved after adopting this technical scheme, solve the resource contradiction of super long alignment infrared eye signal acquisition circuit scale and platform, eliminate a technical bottleneck of the spaceborne infrared remote sensing technology development of restriction.
Description
Technical field
This patent relates to spaceborne infrared camera technology for information acquisition field, particularly relate to the integrated signal acquisition circuit of a kind of spaceborne infrared long detector array, specifically, a kind of in infrared overlength detector array front-end information obtains, various requirement (low noise, high bandwidth, high sampling rate, hyperchannel, small size, lightweight, low-power consumption, high electrical-magnetic compatibility, high reliability) is also deposited, and the resource of super long alignment infrared eye signal acquisition circuit scale and platform exists the solution of contradiction.
Background technology
The core devices of modern infrared imaging system is focal plane arrays (FPA) (focal plane array FPA), comprise detector and signal read circuit, and in current spaceborne infrared camera, infrared alignment detector is often no more than 8 output channels, therefore technology for information acquisition is all generally design by passage, the signal condition that each passage correspondence is complete, tediously long and Acquisition Circuit, or adopt analog switch to carry out signal multiplexing before A/D quantizes, the application scenario that this is less in detector scale, residence time is long, sample frequency is low is feasible.But in recent years along with remote sensing technology is in the development of high time, high spatial, high spectral resolution, detector array scale sharply expands, output channel number (tap number) becomes geometric growth, if by existing technical design, because signal way becomes multiple to increase, multiplex switch speed, Electro Magnetic Compatibility and noiseproof feature are difficult to meet; On the other hand, the resource requirements such as power consumption, volume, weight can linearly increase, and satellite platform resource is limited, and this contradiction cannot solve.Such as, just there is an above-mentioned difficult problem in the spaceborne infrared gear being core with the MCT4000 × 1 long alignment medium wave detector of Shanghai Inst. of Technical Physics, Chinese Academy of Sciences's development.
In sum, along with development and the application of spaceborne super long alignment detector, prior art route cannot meet performance index, extensibility extreme difference, and irreconcilable with the resource contradiction of platform, become a bottleneck of the spaceborne infrared remote sensing technology development of restriction gradually.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, this patent provides a kind of integrated spaceborne super long alignment infrared eye front-end information acquisition cuicuit, and emphasis solves super long alignment detector front end acquisition of information and the low noise in conditioning, high bandwidth, high sampling rate, hyperchannel, small size, lightweight, low-power consumption, high scalability, high electrical-magnetic compatibility, High Reliability Design technical barrier in spaceborne infrared camera.
The technical scheme of this patent is: front-end information acquisition cuicuit is by polylith front end unit module composition, described front end unit module is carried out integrated to 8 tunnel infrared signal modulate circuits, be integrated in a slice asic chip by operational amplifier, sampling holder, high-speed analog switch, high-speed a/d converter, high-speed d/a converter, asic chip completes the process to 2000 yuan of detector 8 tunnel infrared signals.
Front-end information acquisition cuicuit circuit is optimized long detector array front end signal link, adopts multiple front end unit module to carry out the mode of concurrent working, realizes the ability that process reaches the super long alignment infrared eye signal of unit up to ten thousand.
Specifically comprise the following step:
1) long detector array front end signal link is optimized, every 8 infrared channels are adopted to be that 1 front end unit module carries out merging integrated mode, each front end unit module mainly containing 8 channel analog signal conditioning module, inputs containing signal, subtracts each other, amplifies process, SPI interface module, A/D module, D/A module;
2) method for designing based on front end unit module is adopted to complete long line series infrared detector acquisition of information, the output signal of each front end unit module energy independent processing 2000 yuan of long line series infrared detectors;
3) this front end unit module integration is designed to ASIC (dedicated IC chip) curing technology state.
According to the front end unit module (8 passage infrared signal conditioning ASIC) of a kind of spaceborne super long alignment infrared eye acquisition of information circuit of this patent, be made up of the broadband operational amplifier of 24 in sheet, 1 high-speed a/d, 8 high-speed d/as, employing retainer, high-speed analog switch, 8 PGA, possess following functions:
1) drive in the clock period at an infrared eye, instrumental background signal subtraction, amplification, A/D quantification can be carried out to 2000 yuan of infrared eyes (8 tunnels export) simulating signal timesharing, channel isolation is greater than 60dB, and signal to noise ratio (S/N ratio) meets 200:1@PGA=31;
2) by spi bus interface, independently gain-adjusted retaking of a year or grade current state are carried out respectively to 8 infrared channels;
3) by D/A, dynamic background can be carried out to 8 infrared channel simulating signals and subtract each other;
4) A/D quantization digit 12, inversion frequency is not less than 24MSPS, and monolithic output data rate is up to 288Mbps; 12 D/A, inversion frequency is not less than 24MSPS.
Compared with prior art, the beneficial effect of this patent is: the scheme of independently carrying out acquisition of information relative to traditional subchannel, adopt and to solve in super long alignment detector information acquiring technology the technological difficulties such as low noise, high bandwidth, high sampling rate, hyperchannel, small size, lightweight, low-power consumption, high scalability, high electrical-magnetic compatibility, high reliability based on the Integrated design scheme of front end unit module comprehensively, Chinese spaceborne super long alignment detector information acquiring technology is stepped a stage, has opened up a new road in this field.
Specific as follows:
1 lower power consumption 46%, weight reduces about 85%, meet the resource constraint of platform to load; Reduce cabling amount, improve EMC ability; Noise, bandwidth, sampling rate, reliability meet system index requirement;
2 extendabilities significantly improve, and adopt the method for multi-disc concurrent working can adapt to following detector array and continue to increase in scale; Compatible super long alignment TDI infrared eye;
After 3 front-end modules change into ASIC, device is difficult to the difficulty of type selecting due to the distinctive requirement to radioresistance, anti-single particle to overcome spaceflight apparatus, improves space loading information obtaining ability.
Accompanying drawing explanation
Fig. 1 is; Extendible long detector array signal acquisition circuit block diagram.
Fig. 2 is: front end unit module (8 passage infrared signal modulate circuit) structural drawing.
Fig. 3 is: spaceborne 4000 yuan of long line series infrared detector Information Acquisition System schematic diagram.
Fig. 4 is: front end unit module (8 passage infrared signal modulate circuit) internal work sequential chart.
Embodiment
The better embodiment of this patent is provided below in conjunction with accompanying drawing 3 ~ Fig. 4.
The job step that embodiment 1 obtains system according to the spaceborne 4000 yuan infrared overlength detector array front-end information of Fig. 4 is as follows:
S1, spaceborne instrument are energized, peripheral drive circuit work, and spaceborne 4000 yuan of long line series infrared detectors export 32 tunnel simulating signals, send 4 front end unit modules; When input clock is with frequency homophase, during multiple front end unit module cooperative work, the necessary same homophase frequently of all kinds of synchronizing signals of output, Phase-offset control is in half master clock cycle;
S2, when detector pixel drive singal CP (accompanying drawing 4) rising edge arrives, the 8 road analog signal samplings of each front end unit module to input keep, correlated-double-sampling subtraction, maintenance of then sampling;
S3:, the infrared gear background signal from D/A is subtracted each other, expand dynamic range, A/D is sent to quantize signal by multipath high-speed analog switch, quantization digit is 12bit, inversion frequency is 24MSPS, the A/D conversion (for converting signal, AD_WR is the output signal after conversion to accompanying drawing 4, AD_INT) that must complete 8 road signals in clock period CP (accompanying drawing 4) is driven at an infrared eye; Meanwhile, the signal after quantizing A/D, after subsequent process circuit process, can feed back to the D/A input end of front end unit module, circular treatment; Also can pass through SPI interface, D/A input end is disconnected and accesses full 0 signal; D/A conversion (accompanying drawing 4, DA_INT is D/A conversion ready signal, and DA_WR is data input signal) that must complete data in the clock period is driven at an infrared eye;
S4, according to the A/D data collected in S3, send instruction and data by SPI interface, regulate the gain of each infrared simulation passage in front end unit module, make to meet the demands.
Claims (1)
1. an integrated spaceborne long line series infrared detector front-end information acquisition cuicuit, it is by polylith front end unit module composition, it is characterized in that: described front end unit module is carried out integrated to 8 tunnel infrared signal modulate circuits, be integrated in a slice asic chip by operational amplifier, sampling holder, high-speed analog switch, high-speed a/d converter, high-speed d/a converter, asic chip completes the process to 2000 yuan of detector 8 tunnel infrared signals.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420396093.XU CN204085701U (en) | 2014-01-17 | 2014-07-17 | Integrated spaceborne super long alignment infrared eye front-end information acquisition cuicuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410020842.3A CN103852173A (en) | 2014-01-17 | 2014-01-17 | Integrated front-end information acquisition circuit for spaceborne ultralong-linear-array infrared detector |
| CN201410020842.3 | 2014-01-17 | ||
| CN201420396093.XU CN204085701U (en) | 2014-01-17 | 2014-07-17 | Integrated spaceborne super long alignment infrared eye front-end information acquisition cuicuit |
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| CN201410020842.3A Pending CN103852173A (en) | 2014-01-17 | 2014-01-17 | Integrated front-end information acquisition circuit for spaceborne ultralong-linear-array infrared detector |
| CN201420396093.XU Active CN204085701U (en) | 2014-01-17 | 2014-07-17 | Integrated spaceborne super long alignment infrared eye front-end information acquisition cuicuit |
| CN201410341406.6A Pending CN104142181A (en) | 2014-01-17 | 2014-07-17 | Integrated satellite-borne ultralong linear array infrared detector front end information acquisition circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107389587A (en) * | 2017-09-04 | 2017-11-24 | 苏州诺联芯电子科技有限公司 | The non-dispersive infrared gas sensor and its detection method of Monitoring lower-cut can be reduced |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110081984B (en) * | 2019-05-07 | 2020-11-27 | 中国科学院上海技术物理研究所 | Satellite-borne infrared detector multi-path high-speed signal isolation method and infrared imaging system |
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- 2014-01-17 CN CN201410020842.3A patent/CN103852173A/en active Pending
- 2014-07-17 CN CN201420396093.XU patent/CN204085701U/en active Active
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107389587A (en) * | 2017-09-04 | 2017-11-24 | 苏州诺联芯电子科技有限公司 | The non-dispersive infrared gas sensor and its detection method of Monitoring lower-cut can be reduced |
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| CN104142181A (en) | 2014-11-12 |
| CN103852173A (en) | 2014-06-11 |
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