CN203069779U - Dual polarization calibration receiver used for airborne SAR - Google Patents
Dual polarization calibration receiver used for airborne SAR Download PDFInfo
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- CN203069779U CN203069779U CN 201320079566 CN201320079566U CN203069779U CN 203069779 U CN203069779 U CN 203069779U CN 201320079566 CN201320079566 CN 201320079566 CN 201320079566 U CN201320079566 U CN 201320079566U CN 203069779 U CN203069779 U CN 203069779U
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Abstract
In order to overcome a technical problem that an existing ground calibration receiver is greatly influenced by environment, the utility model provides a dual polarization calibration receiver used for an airborne SAR, comprising an antenna unit, a first reception channel unit, a second reception channel unit, a first AD sampling unit, a second AD sampling unit, a memory cell, a reference source unit, a microcomputer control unit, a temperature sensing correction unit, a self calibration unit, a direction control unit, and a time synchronization unit. Beneficial technical effects of the dual polarization calibration receiver are that reception channel gain self calibration is realized by using technologies of high-precision gain closed-loop control, standard channel gain comparison, gain error digital high-precision compensation, temperature correction function automatic compensation, etc. The dual polarization calibration receiver can complete high fidelity reception records of airborne SAR signals, and realizes airborne SAR high-precision external calibration. A dual polarization circular horn antenna is used in the dual polarization calibration receiver, and the dual polarization calibration receiver can receive two types of horizontal and vertical polarized SAR signals and perform radiometric calibration.
Description
Technical field
The utility model belongs to high-frequency detection collimation technique field, relates in particular to the dual polarization calibration receiver for carried SAR.
Background technology
Development along with remote sensing technology, survey for realizing the accurate remote sensing of the earth of carried SAR, need especially pay attention to the calibration work to carried SAR, general calibrating method is at present: settle the ground calibration receiver in microwave radiation calibration field, when carried SAR flies over ground calibration receiver overhead (abbreviate aircraft as and cross the top), the ground calibration receiver receives the signal of carried SAR emission, finishes functions such as carried SAR system antenna pattern measurement, SAR radiant power measurement and supervision SAR system state.But because the variation of ground calibration receiver ambient temperature causes the parameter of ground calibration receiver self to change, thereby influence is to the calibration precision of carried SAR system.Therefore, be badly in need of having the ground calibration receiver of self-calibration function on the market.
The utility model provides a kind of carried SAR dual polarization calibration receiver, and this calibration receiver has adopted receiving cable gain method for self-calibrating to realize gain calibration, realizes the high-fidelity receiving record to the carried SAR signal, thereby realization SAR high precision is calibrated outward; In addition, this calibration receiver has adopted dual polarized antenna to receive the SAR signal, can realize that SAR is at level and the radiation calibration of vertical two kinds of polarization under the working methods.
The utility model content
For overcoming existing ground calibration receiver big technical barrier affected by environment, the utility model is provided for the dual polarization calibration receiver of carried SAR.Its concrete structure is:
Be used for the dual polarization calibration receiver of carried SAR, formed by antenna element 1, the first receiving cable unit 2, the second receiving cable unit 3, an AD sampling unit 4, the 2nd AD sampling unit 5, storage unit 6, reference source unit 7, microcomputer control unit 8, temperature sensing correcting unit 9, self calibration unit 10, sensing control module 11, time synchronized unit 12.
The annexation of above-mentioned each functional unit is:
The signal output part of antenna element 1 is connected with the signal input part of the first receiving cable unit 2; The signal output part of the first receiving cable unit 2 is connected with the signal input part of the second receiving cable unit 3; The signal output part of the second receiving cable unit 3 is connected with the signal input part of an AD sampling unit 4 and the 2nd AD sampling unit 5 respectively; The signal output part of the signal output part of the one AD sampling unit 4 and the 2nd AD sampling unit 5 is connected with the signal input part of storage unit 6 respectively; The signal output part of microcomputer control unit 8 is connected with the signal input part of the second receiving cable unit 3; The signal input part of self calibration unit 10 is connected with reference source unit 7, temperature sensing correcting unit 9 and the signal output part of the second receiving cable unit 3 respectively; The signal output part of self calibration unit 10 is connected with the signal input part of the first receiving cable unit 2 and microcomputer control unit 8 respectively; The signal output part of time synchronized unit 12 is connected with the signal input part of storage unit 6, the signal output part of storage unit 6 is connected with the signal input part of microcomputer control unit 8, and the signal output part of microcomputer control unit 8 is connected with the signal input part that points to control module 11; Wherein,
The signal that antenna element 1 is exported in the first receiving cable unit 2 carries out frequency-selective filtering and amplifies;
The signal that the first receiving cable unit 2 is exported in the second receiving cable unit 3 carries out IQ and separates the mediation amplitude detection;
The one AD sampling unit 4 is gathered the restituted signal that comprises phase information that the second receiving cable unit 3 is exported;
The 2nd AD sampling unit 5 is gathered the restituted signal that comprises amplitude information that the second receiving cable unit 3 is exported;
The calibrating signal that reference source unit 7 is responsible for producing coherent detection reference signal, AD sampled clock signal, clock signal of system and is used for system calibration;
Temperature sensing correcting unit 9 provides corresponding temperature correction facotor signal according to the ambient temperature situation of change to self calibration unit 10;
The antenna that sensing control module 11 is adjusted antenna element 1 by the instruction of microcomputer control unit 8 accurately points to;
Time synchronized unit 12 receives gps satellite signal, and to storage unit 6 time of delivery synchronization pulses, the time when guaranteeing to receive the SAR signal and preserving data is accurate.
Wherein, the first receiving cable unit 2 carries out the frequency-selective filtering amplification with the signal of antenna element 1 output; The signal that the first receiving cable unit 2 is exported in the second receiving cable unit 3 carries out IQ and separates the mediation amplitude detection; The one AD sampling unit 4 is gathered the restituted signal that comprises phase information that the second receiving cable unit 3 is exported; The 2nd AD sampling unit 5 is gathered the restituted signal that comprises amplitude information that the second receiving cable unit 3 is exported; Storage unit 6 is used for the high-capacity and high-speed sampled data of storage the one AD sampling unit 4 and 5 outputs of the 2nd AD sampling unit; The working signals of these products are responsible for producing in reference source unit 7, are specially coherent detection reference signal, AD sampled clock signal, clock signal of system and are used for the calibrating signal of system calibration; Microcomputer control unit 8 provides control signal to the second receiving cable unit 3 and sensing control module 11, and the duty of this product is monitored; Temperature sensing correcting unit 9 provides corresponding temperature correction facotor signal according to the ambient temperature situation of change to alignment unit 10; Self calibration unit 10 receives temperature sensing correcting unit 9 and transmits the temperature correction facotor signal that comes and feed back to microcomputer control unit 8, under microcomputer control unit 8 instructions, the first receiving cable unit 2 and the second receiving cable unit 3 are carried out the internal calibration of channel gain simultaneously, realize the constant control of channel gain; The antenna that sensing control module 11 is adjusted antenna element 1 by the instruction of microcomputer control unit 8 accurately points to; Time synchronized unit 12 receives gps satellite signal, and to storage unit 6 time of delivery synchronization pulses, it is accurate with the time of preserving data time institute mark to guarantee that this product receives the SAR signal.
The utility model has the following advantages compared with the prior art:
1, the self calibration unit of this product has adopted high precision gain closed-loop control, the standard channel ratio of gains to channel gain self calibration technology such as, gain error numeral high-accuracy compensations, has realized the gain calibration of calibration receiver channel;
2, the temperature sensing correcting unit of this product method equipment that makes that adopts temperature correction function automatic compensatory technique to combine with the self calibration unit realizes calibrating the receiver channel gain calibration under the bigger condition of range of temperature;
3, the antenna element of this product adopts dual polarization circular horn antenna form, makes all can receive the SAR signal of level with vertical two kinds of different polarization.
Description of drawings
Fig. 1 is structured flowchart of the present utility model.
Fig. 2 is the structured flowchart of the first receiving cable unit 2 among Fig. 1.
Fig. 3 is the structured flowchart of the second receiving cable unit 3 among Fig. 1.
Sequence number is among the figure: antenna element 1, the first receiving cable unit 2, the second receiving cable unit 3, the one AD sampling unit 4, the 2nd AD sampling unit 5, storage unit 6, reference source unit 7, microcomputer control unit 8, self calibration unit 9, temperature sensing correcting unit 10, point to control module 11, time synchronized unit 12, filter module 13, low noise amplifier module 14, numerical-control attenuator module 15, splitter module 16, IQ demodulator module 17, radio frequency logarithmic detector module 18.
Embodiment
Now be described with reference to the accompanying drawings structure of the present utility model.
Referring to Fig. 1, the dual polarization calibration receiver that is used for carried SAR, be made up of antenna element 1, the first receiving cable unit 2, the second receiving cable unit 3, an AD sampling unit 4, the 2nd AD sampling unit 5, storage unit 6, reference source unit 7, microcomputer control unit 8, temperature sensing correcting unit 9, self calibration unit 10, sensing control module 11, time synchronized unit 12, the annexation of above-mentioned each functional unit is:
The signal output part of antenna element 1 is connected with the signal input part of the first receiving cable unit 2; The signal output part of the first receiving cable unit 2 is connected with the signal input part of the second receiving cable unit 3; The signal output part of the second receiving cable unit 3 is connected with the signal input part of an AD sampling unit 4 and the 2nd AD sampling unit 5 respectively; The signal output part of the signal output part of the one AD sampling unit 4 and the 2nd AD sampling unit 5 is connected with the signal input part of storage unit 6 respectively; The signal output part of microcomputer control unit 8 is connected with the signal input part of the second receiving cable unit 3; The signal input part of self calibration unit 10 is connected with reference source unit 7, temperature sensing correcting unit 9 and the signal output part of the second receiving cable unit 3 respectively; The signal output part of self calibration unit 10 is connected with the signal input part of the first receiving cable unit 2 and microcomputer control unit 8 respectively; The signal output part of time synchronized unit 12 is connected with the signal input part of storage unit 6, the signal output part of storage unit 6 is connected with the signal input part of microcomputer control unit 8, and the signal output part of microcomputer control unit 8 is connected with the signal input part that points to control module 11;
Wherein, the first receiving cable unit 2 signal that antenna element 1 is exported carries out frequency-selective filtering and amplifies; The signal that the first receiving cable unit 2 is exported in the second receiving cable unit 3 carries out IQ and separates the mediation amplitude detection; The one AD sampling unit 4 is gathered the restituted signal that comprises phase information that the second receiving cable unit 3 is exported; The 2nd AD sampling unit 5 is gathered the restituted signal that comprises amplitude information that the second receiving cable unit 3 is exported; Storage unit 6 is used for the high-capacity and high-speed sampled data of storage the one AD sampling unit 4 and 5 outputs of the 2nd AD sampling unit; The working signals of these products are responsible for producing in reference source unit 7, are specially coherent detection reference signal, AD sampled clock signal, clock signal of system and are used for the calibrating signal of system calibration; Microcomputer control unit 8 provides control signal to the second receiving cable unit 3 and sensing control module 11, and the duty of this product is monitored;
Temperature sensing correcting unit 9 provides corresponding temperature correction facotor signal according to the ambient temperature situation of change to self calibration unit 10; Furtherly, temperature sensing correcting unit 9 is to provide corresponding temperature correction facotor in the different temperatures interval of extraneous variation of ambient temperature for system; Temperature sensing correcting unit 9 adopts temperature correction function automatic compensatory technique to realize the gain calibration of calibration receiver channel with the method equipment that makes that self calibration unit 10 combines under the bigger condition of range of temperature in different temperature ranges.
The antenna that sensing control module 11 is adjusted antenna element 1 by the instruction of microcomputer control unit 8 accurately points to; Furtherly, point to the command signal that control module 11 is sent here by microcomputer control unit 8, accurately antenna azimuth and the antenna elevation angle of control antenna unit 1 comprise antenna rotating platform and servo driving control panel that level, vertical orientations control motor composition control antenna point to; The reception that this product transmitted to SAR when the position angle that sensing control module 11 bases set in advance and angle of pitch adjustment antenna direction were crossed the top with the realization aircraft.
Time synchronized unit 12 receives gps satellite signal, and to storage unit 6 time of delivery synchronization pulses, guarantees that the time the when start of this product receives the SAR signal and preserves data is accurate.
Referring to Fig. 2, the first receiving cable unit 2 is made up of filter module 13 and low noise amplifier module 14, wherein, the signal input part of filter module 13 is connected with the signal output part of antenna element 1, the signal output part of filter module 13 is connected with signal input part with low noise amplifier module 14, and the signal output part of low noise amplifier module 14 is connected with the signal input part of the second receiving cable unit 3.The SAR signal that the first receiving cable unit 2 mainly receives antenna element 1 as the receiving front-end of system carries out frequency-selective filtering and low noise amplifies.
Referring to Fig. 3, the second receiving cable unit 3 is made up of numerical-control attenuator module 15, splitter module 16, IQ demodulator module 17 and radio frequency logarithmic detector module 18; Wherein, the signal input part of numerical-control attenuator module 15 is connected with the signal output part of the first receiving cable unit 2, the signal output part of numerical-control attenuator module 15 is connected with the signal input part of splitter module 16, the signal output part of splitter module 16 is connected with the signal input part of IQ demodulator module 17 with radio frequency logarithmic detector module 18 respectively, the signal output part of IQ demodulator module 17 is connected with the signal input part of an AD sampling unit 4, and the signal output part of radio frequency logarithmic detector module 18 is connected with the signal input part of the 2nd AD sampling unit 5.
The second receiving cable unit 3 is with the signal after the first receiving cable unit, 2 filter amplifying processing, be divided into two-way through splitter module 16 merits, one road signal is sent into an AD sampling unit 4 after IQ demodulator module 17 is carried out phase demodulating, another road signal is sent into the 2nd AD sampling unit 5 after radio frequency logarithmic detector module 18 is carried out amplitude detection, obtain amplitude and the phase information of SAR signal respectively.Wherein, the receiving cable gain error correction sign indicating number that numerical-control attenuator module 15 reception microcomputer control units 8 in the second receiving cable unit 3 are sent here is to regulate the damping capacity of numerical-control attenuator, usually, we are arranged on numerical-control attenuator on the damping capacity position intermediate, like this when receiving cable gain calibration, can increase or reduce the gain of damping capacity to reduce or to improve whole passage of numerical-control attenuator, realize the control of whole receiving cable gain, thereby finish system's receiving cable gain self calibration.
In addition, antenna element 1 is dual polarized antenna, i.e. the antenna structure of dual-polarized circular horn shape, and the polarization selector switch by antenna element 1 realizes the reception to the SAR signal of the SAR signal of horizontal polarization or vertical polarization.
During use, before aircraft is crossed the top, i.e. going up of this product of aircraft no show is unprecedented, and the start of this product is also finished internal calibration and the system state detection, finishes the sensing adjustment of antenna element 1 according to steering order, and is in preheat mode.During aircraft is crossed the top, be that aircraft is when arriving this product efficient working range, the timing pulse per second (PPS) that system's time of reception lock unit is sent here, open channel, the signal of carried SAR antenna emission is divided into two-way by merit after antenna element 1 is successively by filter module 13 and low noise amplifier module 14, wherein one road signal is sampled by an AD sampling unit 4 after 17 demodulation of IQ demodulator module, another road signal is sampled by the 2nd AD sampling unit 5 after 18 detections of radio frequency logarithmic detector module, the two-way sampled data send storage unit 6 storages, analyzes for downloading.After aircraft is crossed the top, this product according to instruction or to schedule, for example as quit work after 30 seconds.
Claims (4)
1. the dual polarization calibration receiver that is used for carried SAR, comprise antenna element (1), storage unit (6), reference source unit (7), microcomputer control unit (8), point to control module (11) and time synchronized unit (12), wherein, antenna element (1) receives the SAR signal; The calibrating signal that reference source unit (7) is responsible for producing coherent detection reference signal, AD sampled clock signal, clock signal of system and is used for system calibration; The signal output part of time synchronized unit (12) is connected with the signal input part of storage unit (6), the signal output part of storage unit (6) is connected with the signal input part of microcomputer control unit (8), the signal output part of microcomputer control unit (8) is connected with the signal input part that points to control module (11), the antenna that sensing control module (11) is adjusted antenna element (1) by the instruction of microcomputer control unit (8) accurately points to, time synchronized unit (12) receives gps satellite signal, and to storage unit (6) time of delivery synchronization pulse, the time when guaranteeing to receive the SAR signal and preserving data is accurate; It is characterized in that, also comprise the first receiving cable unit (2), the second receiving cable unit (3), an AD sampling unit (4), the 2nd AD sampling unit (5), temperature sensing correcting unit (9) and self calibration unit (10) composition, the annexation of above-mentioned each functional unit is
The signal output part of antenna element (1) is connected with the signal input part of the first receiving cable unit (2); The signal output part of the first receiving cable unit (2) is connected with the signal input part of the second receiving cable unit (3); The signal output part of the second receiving cable unit (3) is connected with the signal input part of an AD sampling unit (4) and the 2nd AD sampling unit (5) respectively; The signal output part of the signal output part of the one AD sampling unit (4) and the 2nd AD sampling unit (5) is connected with the signal input part of storage unit (6) respectively; The signal output part of microcomputer control unit (8) is connected with the signal input part of the second receiving cable unit (3); The signal input part of self calibration unit (10) is connected with reference source unit (7), temperature sensing correcting unit (9) and the signal output part of the second receiving cable unit (3) respectively; The signal output part of self calibration unit (10) is connected with the signal input part of the first receiving cable unit (2) and microcomputer control unit (8) respectively; Wherein,
The signal that antenna element (1) is exported in the first receiving cable unit (2) carries out frequency-selective filtering and amplifies;
The signal that the first receiving cable unit (2) is exported in the second receiving cable unit (3) carries out IQ and separates the mediation amplitude detection;
The one AD sampling unit (4) is gathered the restituted signal that comprises phase information that the second receiving cable unit (3) is exported;
The 2nd AD sampling unit (5) is gathered the restituted signal that comprises amplitude information that the second receiving cable unit (3) is exported;
Storage unit (6) is used for the high-capacity and high-speed sampled data of storage the one AD sampling unit (4) and the output of the 2nd AD sampling unit (5);
Microcomputer control unit (8) provides control signal to the second receiving cable unit (3);
Temperature sensing correcting unit (9) provides corresponding temperature correction facotor signal according to the ambient temperature situation of change to self calibration unit (10);
Self calibration unit (10) receives temperature sensing correcting unit (9) and transmits next temperature correction facotor signal and feed back to microcomputer control unit (8), under microcomputer control unit (8) instruction, the first receiving cable unit (2) and the second receiving cable unit (3) are carried out the internal calibration of channel gain simultaneously, realize the constant control of channel gain.
2. receiver is calibrated in the dual polarization for carried SAR as claimed in claim 1, it is characterized in that, the first receiving cable unit (2) is made up of filter module (13) and low noise amplifier module (14), wherein, the signal input part of filter module (13) is connected with the signal output part of antenna element (1), the signal output part of filter module (13) is connected with signal input part with low noise amplifier module (14), and the signal output part of low noise amplifier module (14) is connected with the signal input part of the second receiving cable unit (3).
3. receiver is calibrated in the dual polarization for carried SAR as claimed in claim 1, it is characterized in that the second receiving cable unit (3) is made up of numerical-control attenuator module (15), splitter module (16), IQ demodulator module (17) and radio frequency logarithmic detector module (18); Wherein, the signal input part of numerical-control attenuator module (15) is connected with the signal output part of the first receiving cable unit (2), the signal output part of numerical-control attenuator module (15) is connected with the signal input part of splitter module (16), the signal output part of splitter module (16) is connected with the signal input part of IQ demodulator module (17) with radio frequency logarithmic detector module (18) respectively, the signal output part of IQ demodulator module (17) is connected with the signal input part of an AD sampling unit (4), and the signal output part of radio frequency logarithmic detector module (18) is connected with the signal input part of the 2nd AD sampling unit (5).
4. the dual polarization calibration receiver for carried SAR as claimed in claim 1 is characterized in that antenna element (1) be dual polarized antenna, and the polarization selector switch realization by the back utmost point is to the reception of the SAR signal of the SAR signal of horizontal polarization or vertical polarization.
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| CN 201320079566 CN203069779U (en) | 2013-02-21 | 2013-02-21 | Dual polarization calibration receiver used for airborne SAR |
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| CN 201320079566 CN203069779U (en) | 2013-02-21 | 2013-02-21 | Dual polarization calibration receiver used for airborne SAR |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104297738A (en) * | 2014-11-13 | 2015-01-21 | 中国科学院电子学研究所 | Synchronization calibration device and synchronization calibration and error compensation method for multi-channel receiver |
| CN104316913A (en) * | 2014-11-13 | 2015-01-28 | 中国科学院电子学研究所 | Multichannel receiver real-time calibration device and calibration and error compensation method |
| CN104539307A (en) * | 2014-12-02 | 2015-04-22 | 苏州沃斯麦机电科技有限公司 | Signal processing system based on segmented pi-type low-pass filter circuit |
| CN108650036A (en) * | 2018-05-03 | 2018-10-12 | 中国科学院新疆天文台 | A kind of simple beam coolant receiver calibrating method |
| RU2672050C1 (en) * | 2018-03-15 | 2018-11-09 | Публичное акционерное общество "Научно-производственное объединение "Алмаз" имени академика А.А. Расплетина (ПАО "НПО "Алмаз") | Radio pulse train shaper with a large dynamic range |
| CN109444888A (en) * | 2018-12-31 | 2019-03-08 | 成都汇蓉国科微系统技术有限公司 | A kind of star forward sight double-base SAR image-region monitor method and system |
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2013
- 2013-02-21 CN CN 201320079566 patent/CN203069779U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104297738A (en) * | 2014-11-13 | 2015-01-21 | 中国科学院电子学研究所 | Synchronization calibration device and synchronization calibration and error compensation method for multi-channel receiver |
| CN104316913A (en) * | 2014-11-13 | 2015-01-28 | 中国科学院电子学研究所 | Multichannel receiver real-time calibration device and calibration and error compensation method |
| CN104539307A (en) * | 2014-12-02 | 2015-04-22 | 苏州沃斯麦机电科技有限公司 | Signal processing system based on segmented pi-type low-pass filter circuit |
| RU2672050C1 (en) * | 2018-03-15 | 2018-11-09 | Публичное акционерное общество "Научно-производственное объединение "Алмаз" имени академика А.А. Расплетина (ПАО "НПО "Алмаз") | Radio pulse train shaper with a large dynamic range |
| CN108650036A (en) * | 2018-05-03 | 2018-10-12 | 中国科学院新疆天文台 | A kind of simple beam coolant receiver calibrating method |
| CN108650036B (en) * | 2018-05-03 | 2020-08-04 | 中国科学院新疆天文台 | Calibration method for single-beam refrigeration receiver |
| CN109444888A (en) * | 2018-12-31 | 2019-03-08 | 成都汇蓉国科微系统技术有限公司 | A kind of star forward sight double-base SAR image-region monitor method and system |
| CN109444888B (en) * | 2018-12-31 | 2020-10-23 | 成都汇蓉国科微系统技术有限公司 | Satellite-ground foresight bistatic SAR image area monitoring method and system |
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Granted publication date: 20130717 |