CN103412308A - High-precision interferometric synthetic aperture radar system - Google Patents
High-precision interferometric synthetic aperture radar system Download PDFInfo
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- CN103412308A CN103412308A CN2013103668693A CN201310366869A CN103412308A CN 103412308 A CN103412308 A CN 103412308A CN 2013103668693 A CN2013103668693 A CN 2013103668693A CN 201310366869 A CN201310366869 A CN 201310366869A CN 103412308 A CN103412308 A CN 103412308A
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Abstract
The invention provides a high-precision interferometric synthetic aperture radar system for solving the problems that an interferometric synthetic aperture radar system is low in precision and poor in operating capability in service. The system comprises a pod, a long rigid baseline, an antenna extension set, a microwave assembly unit, a low-power radio frequency unit, a transmitter, an internal calibration unit, a data acquisition and recording unit, a local monitoring and control unit, a position attitude measurement unit, an airline control unit and a complete machine power distribution unit. Height accuracy of the system is increased to 0.3 meter (under flat topographical conditions) from 3.0 meters of an original system and meets the map measurement requirement of 1:10000, real-time calibration of system errors enables the system to operate in service, and application and development of an interferometric synthetic aperture radar are forcefully promoted.
Description
Technical field
The invention belongs to earth observation and field of navigation technology, relate to a kind of system with the High-precision Microwave earth observation of surveying high ability.
Background technology
Interference synthetic aperture radar (InSAR) is a kind of polarization sensitive synthetic aperture radar system with measurement of higher degree ability, especially, under the weather environment of cloudy mist, can realize map surveying, can be widely used in area in hardship topography mapping.
Existing InSAR system works, under two receipts patterns, only can realize 1:50000 engineer's scale mapping.
Yet along with the requirement to the InSAR mapping system is increased to the 1:10000 engineer's scale, will possess the business service ability simultaneously in recent years, no matter prior art still can not satisfy the demands from business operation aspect from the precision aspect, major embodiment in the following areas:
(1) vertical accuracy deficiency, existing InSAR base length is not possessing the basic condition of high precision mapping aspect the physics baseline.
(2) mode of operation is single, present mode is a two receipts pattern (antenna transmission, two antennas receive simultaneously), do not possess (two the antenna table tennis emission of table tennis emission mode, the reception of two antenna table tennis) mode of operation, the relative two receipts patterns of this pattern can double equivalent baseline length, therefore aspect mode of operation, do not possess the high-precision ability of putting forward.
(3) interfere vertical accuracy to rely on ground control point and maintain vertical accuracy, the business service ability is poor.
Summary of the invention
The objective of the invention is in order to overcome the defect of prior art, in order to solve the problem that the interference synthetic aperture radar system accuracy is low, the business service ability is poor, propose a kind of high precision interference synthetic aperture radar system.
The present invention is achieved through the following technical solutions:
A kind of high precision interference synthetic aperture radar system comprises: gondola, long rigidity baseline, antenna extension set, microwave assembled unit, low-power radio frequency unit, transmitter, internal calibration unit, data acquisition-and-recording unit, local monitoring and control module, position and attitude measuring unit (POS), course line control module and complete machine power supply unit;
Gondola is the installation carrier of antenna extension set, for carrying antenna extension set under the condition keeping the aircraft Pneumatic safety;
Gondola is installed at the two ends of long rigidity baseline, be used to keeping being rigidly connected of aircraft carrier and gondola;
The antenna extension set comprises two single-polarized antennas, is arranged on respectively in the gondola at long rigidity baseline two ends, for radiation signal, and receives echoed signal;
The microwave assembled unit, between transmitter, antenna extension set, low-power radio frequency unit and internal calibrator unit, transmitting radar emission and receiving signal, is realized the reception signal that transmits signals to the antenna extension set of transmitter to gating, the generation emission rate-aided signal of low-power radio frequency unit and sends to the low-power radio frequency unit;
The low-power radio frequency unit, for generation of radar reference frequency and linear FM signal, completes amplification, frequency conversion, filtering, amplitude adjustment and quadrature demodulation that radar return receives signal, completes simultaneously the transmitting-receiving translation function;
Transmitter carries out pulsed modulation, power amplification for the emission pumping signal that the low-power radio frequency unit is sent here, then through transmit-receive switch, microwave feeder antennas to external radiation.
The internal calibration unit, for generation of rate-aided signal, carries out the phase calibration between the SAR system channel;
The data acquisition-and-recording unit has been used for digital quantization and the storage of echo data;
Local monitoring is used for monitoring and control antenna extension set, low-power radio frequency unit, transmitter, microwave assembled unit and internal calibration unit with control module;
Position and attitude measuring unit (POS) is for position, the attitude information of survey aircraft platform, for the motion compensation process of radar system;
The course line control module, for instructing real-time correction flight parameter, makes aircraft along the design airline operation;
The complete machine power supply unit distributes for managing electrical power, and power supply is provided.
Described long rigidity base length is 2.3 meters.
Described microwave assembled unit adopts the table tennis mode of operation.
Beneficial effect of the present invention:
The present invention improves the effective base length of InSAR jointly by the ping-pong function of long rigidity baseline and microwave combination, and then raising measurement of higher degree precision, by increasing the internal calibration system, the phase error drift of system is demarcated, make the InSAR system possess the business service ability, concrete effect is as follows:
(1) grow the rigidity base length and be increased to 2.3 meters from original 0.5 meter, improved 4.6 times of physical base line lengths when guaranteeing rigidity, improved measurement of higher degree precision.
(2) on the basis of long rigidity base length, increase microwave combination table tennis mode of operation function, for two receipts patterns, improved 2 times of effective base lengths, further improved measurement of higher degree precision.
(3) by receiver temperature compensation and the increase internal calibration system real-time calibration of design low-power radio frequency extension set inside, interfere interchannel phase place to change two kinds of methods that improve system phase stability, make system from every scape image calibration, once be reduced to each sortie demarcation once to the requirement of phase control point, make the InSAR system possess the business service ability.
Vertical accuracy of the present invention is increased to 0.3 meter (subdued topography) from 3.0 meters of original system, meet the requirement of 1:10000 mapping, but the real-time calibration of systematic error makes this system business operation, has advanced effectively the application development of interference synthetic aperture radar.
The accompanying drawing explanation
Fig. 1 is high precision interference synthetic aperture radar system composition diagram;
Fig. 2 is long rigidity baseline and gondola design;
Fig. 3 is ping pong scheme microwave composite design;
Fig. 4 is phase calibration;
Fig. 5 designs for low-power radio frequency;
Fig. 6 designs for data acquisition-and-recording;
Fig. 7 is that design is controlled in course line;
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiment of the present invention is elaborated,
A kind of high precision interference synthetic aperture radar system comprises following part:
Gondola, long rigidity baseline, antenna extension set, microwave assembled unit, low-power radio frequency unit, transmitter, internal calibration unit, data acquisition-and-recording unit, local monitoring and control module, position and attitude measuring unit (POS), course line control module and complete machine power supply unit;
Wherein, long rigidity baseline and gondola (1), be used to building 2.3 meters length physical interference baselines, fix up an aerial wire respectively in the gondola at baseline structural member two ends;
Microwave assembled unit (3), be used to realizing ping pong scheme, namely each pulse repetition time is carried out switching over.By the cooperation of the switch controlling signal of synchronizeing with interference SAR system and sequential, carry out the state of gauge tap, make pumping signal alternate emission between two interference SAR antennas, complete the table tennis mode of operation, concrete sequential control mode is as follows:
The time of reception 1, switch directional antenna 1, receiving cable 1 receives signal;
The time of reception 2, switch directional antenna 2, receiving cable 2 receives signal;
Internal calibration unit (4), for the phase error of real-time calibration passage, the emission coupled signal is through scaler, and the scaler output work inputs to the low-power radio frequency extension set by coupling port after dividing, control by the sampling time, obtain simultaneously rate-aided signal and echoed signal.
Low-power radio frequency unit (5), during emission for generation of pumping signal; During reception, for receiving the echoed signal of microwave array output, amplify, mixing, filtering, the output baseband signal is to the data data acquisition-and-recording.
Data acquisition-and-recording unit (6), carry out being recorded to memory device after the analog digital conversion for the simulating signal low-power radio frequency output.
Course line control module (7), for showing in real time the error between current flight position and design course line, be beneficial to aircraft position attitude adjustment.
Annexation between above-mentioned building block is: long rigidity baseline and gondola and aircraft platform rigidity are interconnected, antenna in gondola connects the microwave combination by the crossing cabin waveguide network, the microwave combination connects low-power radio frequency by cabin inner waveguide network, and low-power radio frequency gathers and record by the analog signal line connection data.Internal calibration is coupled by emission and receives coupling port and connects in the crossing cabin waveguide network between microwave combination and antenna, and Navigation Control is independent of other parts operation.
The specific works process of native system is as follows:
At first from course line control extensions input course line task scheduling, local monitoring is controlled the low-power radio frequency extension set with control extensions and is produced pumping signal after aircraft enters course line, signal inputs to microwave combination extension set and carries out the transmission channel selection after transmitter amplifies, the transmission channel selection function of microwave combination has herein determined that the mode of operation of system becomes ping pong scheme from two schema evolutions of receiving of routine, significantly improve equivalence and interfere base length, and then improve and interfere vertical accuracy.The signal of microwave array output inputs to antenna through the waveguide network that is arranged on long rigidity baseline inside.The antenna extension set is converted to wave transparent window that microwave signal sees through gondola to electric signal and is radiated to and surveys district, the echo information of survey district clutter reflections is carried out microwave signal to electric signal conversion through antenna and is inputed to the microwave combination, the microwave combination inputs to the low-power radio frequency extension set by channel selecting, finally by the storage file of crossing data acquisition-and-recording extension set formation digital signal.
The calibration flow process is in transmitter output signal, from microwave array output signal port coupling output one road signal process internal calibrator time delay, amplification, and then after the microwave combination, together enter low-power radio frequency extension set with radar return by microwave combinatorial input port, the data file finally formed has comprised radar echo signal and rate-aided signal simultaneously, when data are processed from rate-aided signal, extracting the phase place change information of passage, the phase drift of compensation channels.
Claims (3)
1. high precision interference synthetic aperture radar system, it is characterized in that, comprising: gondola, long rigidity baseline, antenna extension set, microwave assembled unit, low-power radio frequency unit, transmitter, internal calibration unit, data acquisition-and-recording unit, local monitoring and control module, position and attitude measuring unit (POS), course line control module and complete machine power supply unit;
Gondola is the installation carrier of antenna extension set, for carrying antenna extension set under the condition keeping the aircraft Pneumatic safety;
Gondola is installed at the two ends of long rigidity baseline, be used to keeping being rigidly connected of aircraft carrier and gondola;
The antenna extension set comprises two single-polarized antennas, is arranged on respectively in the gondola at long rigidity baseline two ends, for radiation signal, and receives echoed signal;
The microwave assembled unit, between transmitter, antenna extension set, low-power radio frequency unit and internal calibrator unit, transmitting radar emission and receiving signal, is realized the reception signal that transmits signals to the antenna extension set of transmitter to gating, the generation emission rate-aided signal of low-power radio frequency unit and sends to the low-power radio frequency unit;
The low-power radio frequency unit, for generation of radar reference frequency and linear FM signal, completes amplification, frequency conversion, filtering, amplitude adjustment and quadrature demodulation that radar return receives signal, completes simultaneously the transmitting-receiving translation function;
Transmitter carries out pulsed modulation, power amplification for the emission pumping signal that the low-power radio frequency unit is sent here, then through transmit-receive switch, microwave feeder antennas to external radiation.
The internal calibration unit, for generation of rate-aided signal, carries out the phase calibration between the SAR system channel;
The data acquisition-and-recording unit has been used for digital quantization and the storage of echo data;
Local monitoring is used for monitoring and control antenna extension set, low-power radio frequency unit, transmitter, microwave assembled unit and internal calibration unit with control module;
Position and attitude measuring unit (POS) is for position, the attitude information of survey aircraft platform, for the motion compensation process of radar system;
The course line control module, for instructing real-time correction flight parameter, makes aircraft along the design airline operation;
The complete machine power supply unit distributes for managing electrical power, and power supply is provided.
2. a kind of high precision interference synthetic aperture radar system as claimed in claim 1, is characterized in that, described long rigidity base length is 2.3 meters.
3. a kind of high precision interference synthetic aperture radar system as claimed in claim 1 or 2, is characterized in that, described microwave assembled unit adopts the table tennis mode of operation, and namely each pulse repetition time is carried out switching over.By the cooperation of the switch controlling signal of synchronizeing with interference SAR system and sequential, carry out the state of gauge tap, make pumping signal alternate emission between two interference SAR antennas, complete the table tennis mode of operation.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104090276A (en) * | 2014-07-02 | 2014-10-08 | 西南民族大学 | Radio frequency stealth onboard synthetic aperture radar |
| CN105425814A (en) * | 2015-11-24 | 2016-03-23 | 木牛（青岛）科技有限公司 | Control system and control method for unmanned plane |
| CN106093881A (en) * | 2016-06-01 | 2016-11-09 | 中国科学院电子学研究所 | The combined receiving method of a kind of microwave signal and device |
| CN108562880A (en) * | 2018-04-26 | 2018-09-21 | 西安空间无线电技术研究所 | A kind of reflecting surface Spaceborne SAR System internal calibration network element and internal calibration method |
| CN108957455A (en) * | 2018-08-01 | 2018-12-07 | 华北水利水电大学 | A kind of InSAR demodulation modulation processing method of DEM auxiliary |
| CN109782285A (en) * | 2019-03-15 | 2019-05-21 | 中国科学院电子学研究所 | A kind of single channel full-polarization SAR implementation method based on frequency transformation |
| CN109884631A (en) * | 2019-02-21 | 2019-06-14 | 中国科学院电子学研究所 | The method and system of satellite-borne synthetic aperture radar internal calibration data processing |
| WO2020154903A1 (en) * | 2019-01-29 | 2020-08-06 | 华为技术有限公司 | Method and device for determining elevation, and radar |
| CN116106873A (en) * | 2023-04-13 | 2023-05-12 | 西南交通大学 | Mobile laser radar calibration control system and method |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104090276A (en) * | 2014-07-02 | 2014-10-08 | 西南民族大学 | Radio frequency stealth onboard synthetic aperture radar |
| CN105425814A (en) * | 2015-11-24 | 2016-03-23 | 木牛（青岛）科技有限公司 | Control system and control method for unmanned plane |
| CN106093881A (en) * | 2016-06-01 | 2016-11-09 | 中国科学院电子学研究所 | The combined receiving method of a kind of microwave signal and device |
| CN106093881B (en) * | 2016-06-01 | 2018-09-07 | 中国科学院电子学研究所 | A kind of combined receiving method and device of microwave signal |
| CN108562880A (en) * | 2018-04-26 | 2018-09-21 | 西安空间无线电技术研究所 | A kind of reflecting surface Spaceborne SAR System internal calibration network element and internal calibration method |
| CN108562880B (en) * | 2018-04-26 | 2021-03-26 | 西安空间无线电技术研究所 | Internal calibration network unit and internal calibration method of reflector spaceborne SAR system |
| CN108957455A (en) * | 2018-08-01 | 2018-12-07 | 华北水利水电大学 | A kind of InSAR demodulation modulation processing method of DEM auxiliary |
| CN108957455B (en) * | 2018-08-01 | 2022-06-28 | 华北水利水电大学 | DEM (digital elevation model) -assisted InSAR (interferometric synthetic aperture radar) demodulation and modulation processing method |
| WO2020154903A1 (en) * | 2019-01-29 | 2020-08-06 | 华为技术有限公司 | Method and device for determining elevation, and radar |
| CN113302519A (en) * | 2019-01-29 | 2021-08-24 | 华为技术有限公司 | Method and device for determining elevation and radar |
| CN109884631B (en) * | 2019-02-21 | 2020-11-10 | 中国科学院电子学研究所 | Method and system for processing calibration data in satellite-borne synthetic aperture radar |
| CN109884631A (en) * | 2019-02-21 | 2019-06-14 | 中国科学院电子学研究所 | The method and system of satellite-borne synthetic aperture radar internal calibration data processing |
| CN109782285B (en) * | 2019-03-15 | 2021-06-04 | 中国科学院电子学研究所 | Single-channel full-polarization SAR realization method based on frequency transformation |
| CN109782285A (en) * | 2019-03-15 | 2019-05-21 | 中国科学院电子学研究所 | A kind of single channel full-polarization SAR implementation method based on frequency transformation |
| CN116106873A (en) * | 2023-04-13 | 2023-05-12 | 西南交通大学 | Mobile laser radar calibration control system and method |
| CN116106873B (en) * | 2023-04-13 | 2023-10-24 | 西南交通大学 | Mobile laser radar calibration control system and method |
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Application publication date: 20131127 |