CN103376451B - Airborne double-waveband synthetic aperture radar system and method for measuring vegetation thickness utilizing same - Google Patents
Airborne double-waveband synthetic aperture radar system and method for measuring vegetation thickness utilizing same Download PDFInfo
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Abstract
The invention discloses an airborne double-waveband synthetic aperture radar system and a method for measuring vegetation thickness utilizing same. The airborne double-waveband synthetic aperture radar system includes: an airborne platform, an antenna system, a stabilization platform, and a distributed POS. The antenna system includes an L-band main receiving and transmitting antenna, two L-band vice receiving and transmitting antennas, and a Ka-band receiving and transmitting antenna group. The method for measuring vegetation thickness includes: taking the L-band main receiving and transmitting antenna and the L-band vice receiving and transmitting antennas as flexible long base lines, measuring corresponding phase center positions of the three antennas by the distributed POS, obtaining time-varying information of the phase centers of the antennas during imaging period, and meanwhile carrying out wave beam stabilization and direction control for the Ka-band receiving and transmitting antenna by utilizing the stabilization platform; combining POS data with signals received by each antenna to carry out imaging processing respectively; carrying out interference processing for the imaging results of the L-band and the Ka-band, and obtaining an object scene DTM and an object scene DSM; and obtaining vegetation thickness information by subtracting one of the DTM and the DSM by the other. With the airborne double-waveband synthetic aperture radar system and the method for measuring vegetation thickness utilizing same, application range of an airborne radar in the microwave sensing field is expanded.
Description
Technical field
The invention belongs to interference synthetic aperture radar (Interferometric Synthetic Aperture Radar, and microwave remote sensing technique field InSAR), be specifically related to a kind of airborne double-waveband synthetic aperture radar and utilize it to measure the method for vegetation thickness, particularly utilize airborne synthetic aperture radar system at the interference technique of L and Ka two waveband to obtain the method for target scene terrain information and surface vegetation information.
Background technology
Airborne Interference synthetic aperture radar (InSAR) is for the development comparative maturity of the 3 Dimension Image Technique of target scene, and groundwork mode has single antenna pair to navigate and double antenna list navigated two kinds.Compared with two mode of navigating, singly the mode of navigating can overcome Temporal decoherence and the problem such as twice flight track be not parallel effectively, therefore applies more.Two receipts and internal loopback (ping pong scheme) two kinds of mode of operations are divided into again in mode of singly navigating.The high ultimate principle of survey is interfered to be utilize interferometric phase to obtain the range difference of target to two antenna phase centers, distance relation is utilized to obtain target drift angle, and then obtain object height information (see Rosen P.A., Hensley S., Joughin I.R., et al.Synthetic Aperture Radar Interferometry [J] .Proc.Of the IEEE, 2000,88 (3); Li Dao-jing, Qiao Ming, Yin Jian-feng, Zhu Jin-biao, Xi Ying, Airborne MMW cross-track InSAR system analysis, APSAR 2007 [C], Huangshan, China).
Millimeter wave InSAR is because wavelength is shorter, easily realize high-resolution imaging, the reasons such as high vertical accuracy can be obtained and receive much concern under Short baseline, also a series of experimental system is devised (see Dao-jing Li both at home and abroad, Bo Liu, Zhou-hao Pan, et al.Airborne MMW InSAR Interferometry with cross-track three-baseline antennas [C] .EUSAR 2012; Magnard C., Meier E., R ü egg M., et al.High Resolution Millimeter Wave SAR Interferometry [C] .IGARSS 2007.July 2007, Barcelona).
The extraction of vegetation (as forest) thickness and agent structure information, to the forestry such as biomass estimation, crop yield prediction and agrotechnical development significant, this technology is subject to extensive concern in microwave remote sensing field.At present, polarization interference technology has developed into one more effective vegetation thickness estimation method, the method adopts suitable modeler model as RVoG, ERVoG, OVoG etc. (see female .P wave band full-polarization SAR data processing method research [D] in summer east. Hefei: China Science & Technology University .2011) utilize the decay of P or L long-wave band signal when penetrating vegetation to the impact of polarization interference coefficient to estimate that the information such as Terrain Elevation and vegetation thickness is (see Papathanassiou K.P., Cloude S.R.Single-Baseline Polarimetric SAR Interferometry [J] .IEEE transactions on Geoscience and Remote Sensing.2001, 39 (11): 2352-2363, Garestier F., Dubois-Fernandez P.C., Champion I.Forest Height Inversion Using High-Resolution P-Band Plo-InSAR Data [J] .IEEE transaction on Geoscience and Remote sensing, 2008,46 (11): 3544-3559, Cloude S.R., P.P.K.Three-stage Inversion Process for Polarimetric SAR Interferometry [C] .IEE Proceeding of Radar, Sonar and Navigation, 2003.125-134).
The external result of related experiment system to real data shows the validity of the method (see Bryan Mercer, Qiaoping Zhang, Marcus Schwaebisch, et al.Forest Height and Ground Topography at L-Band from an Experimental Single-Pass Airborne PolInSAR System [C] .PolInSAR 2009.January 2009, Italy).
When the polarization interference technology based on long-wave band more than introduced is for vegetation thickness estimation, high to the elevation estimated accuracy of landform, low to the estimated accuracy of vegetation thickness.Actual to use, the selection of transaction module and model parameter and the type of ground vegetation and characteristic have stronger relation.Concrete manifestation is as follows: do not consider that vegetable layer is more applicable with RVoG model during the anisotropy polarized; If the most of branch of seeds is positioned at canopy upper strata, then ERVoG adapts to more than RVoG; If trees canopy is more sparse, main and forest agent structure such as the trunk of electromagnetic wave interacts, and makes volume scattering present certain directive property, then needs to consider use OVoG model.The parameter related in each model is above also relevant with ground vegetation characteristic, if extinction coefficient characterizes the physical quantity that medium makes electromagnetic wave attenuation degree, the electromagnetic wave of different vegetation to different-waveband has different extinction coefficients, if extinction coefficient is selected too small, vegetation thickness will be over-evaluated, otherwise will underestimate.
Summary of the invention
(1) technical matters that will solve
Technical matters to be solved by this invention: the existing vegetation method for measuring thickness based on polarization interference technology mainly contains 2 deficiencies: one, choosing of transaction module and model parameter is relied on to a great extent to the measuring accuracy of vegetation thickness, this chooses the prior imformation of process dependence about vegetation, therefore, when target area vegetation information is completely unknown, greatly reduce making the measuring accuracy of vegetation thickness; Even if two have selected suitable model and parameter, it is still not high to the measuring accuracy of vegetation thickness.
(2) technical scheme
For solving the problems of the technologies described above, the present invention propose a kind of do not need target area vegetation prior imformation and have compared with high measurement accuracy based on airborne two waveband synthetic-aperture radar vegetation method for measuring thickness.
One according to the present invention airborne two waveband interference synthetic aperture radar system, comprise carrier aircraft platform, antenna system, stable platform and distributed POS, described antenna system comprises a main dual-mode antenna of L-band, two secondary dual-mode antennas of L-band and a Ka wave band dual-mode antenna group; Secondary dual-mode antenna is distributed is equipped on described carrier aircraft platform for the main dual-mode antenna of described L-band and two L-bands, and forms flexible Long baselines and interfere relation, for obtaining landform altitude information; Described Ka wave band dual-mode antenna group is equipped on described stable platform, for obtaining Vegetation canopy elevation information.
According to the preferred embodiment of the present invention, described distributed POS by three independently POS form, it is sent out with the main dual-mode antenna of described L-band and described two L-bands pair respectively and receives together with astronomical cycle, for measuring the position of three antennas between operational period and attitude information.
According to the preferred embodiment of the present invention, described carrier aircraft platform is an aircraft, carry gondola below the wing of this aircraft, and this gondola is for installing the secondary dual-mode antenna of described L-band; Further, carry described stable platform and the main dual-mode antenna of L-band in the ventral position of described aircraft, stable platform is laid Ka wave band dual-mode antenna group.
According to the preferred embodiment of the present invention, have an optical window downwards at the ventral of described aircraft, so that the main dual-mode antenna of described L-band and Ka wave band dual-mode antenna group are to ground receiving and transmitting signal.
According to the preferred embodiment of the present invention, described Ka wave band dual-mode antenna group adopts the many baseline configuration mountings of rigidity to be arranged on stable platform.
According to the preferred embodiment of the present invention, the major and minor dual-mode antenna of described L-band all adopts complete polarization antenna, and sweeps mutually to employing in orientation, utilizes the orientation of phase control wave beam to sensing, to eliminate the impact of aircraft drift angle.
According to the preferred embodiment of the present invention, what the transmitter of described Ka wave band dual-mode antenna group adopted is travelling-wave tube amplifier (TWTA).
According to the preferred embodiment of the present invention, described Ka wave band dual-mode antenna group is made up of to broad beam antenna distance.
According to the preferred embodiment of the present invention, described stable platform comprises a rotating mechanism, and for realizing a left side for Ka wave band antenna group depending on looking control with the right side, described Ka wave band antenna group and this rotating mechanism all adopt rectification voluntarily.
The present invention also proposes a kind ofly to utilize airborne two waveband interference synthetic aperture radar system to measure the method for vegetation thickness information, described airborne two waveband interference synthetic aperture radar system comprises carrier aircraft platform, antenna system, stable platform and distributed POS, described antenna system comprises a main dual-mode antenna of L-band, two secondary dual-mode antennas of L-band and a Ka wave band dual-mode antenna group, secondary dual-mode antenna is distributed is equipped on described carrier aircraft platform for the main dual-mode antenna of described L-band and two L-bands, and form flexible Long baselines and interfere relation, described Ka wave band dual-mode antenna group is equipped on described stable platform, it is characterized in that, first described method comprises the steps:, by described L-band master, secondary dual-mode antenna baseline is as flexible Long baselines, distributed POS is utilized to measure the position of these three antenna phase centers, obtain the varying information of antenna phase center during imaging, simultaneously, described Ka wave band dual-mode antenna group utilized described stable platform to carry out wave beam stablize and point to control, then, described radar system is carried out flight operation, and the signal combination POS data that each antenna is received imaging processing respectively, then, polarization interference process is carried out to the imaging results of described L-band, obtain target scene DTM, and interference treatment is carried out to described Ka wave band imaging results, obtain target scene DSM, finally, described target scene DTM and target scene DSM is carried out to subtract each other the vegetation thickness information obtaining target scene.
(3) beneficial effect
The airborne two waveband interference synthetic aperture radar system that the present invention proposes utilizes two waveband interference technique to measure vegetation thickness, has expanded the range of application of airborne radar in microwave remote sensing field.The present invention can realize extraction to vegetation agent structure information, the estimation of biomass, the prediction etc. of crop yield, and the development for forestry and agricultural is significant.
Accompanying drawing explanation
Fig. 1 is antenna mounting locations schematic diagram of the present invention;
Fig. 2 is signal processing flow figure of the present invention;
Fig. 3 is that interferometry schematic diagram is looked on the L-band antenna right side of the present invention;
Fig. 4 be one embodiment of the present of invention to transport 12 as the aircraft configuration structure of carrier aircraft platform and antenna mounting locations schematic diagram.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in further detail.
Airborne two waveband interference synthetic aperture radar system of the present invention comprises carrier aircraft platform, unit in antenna system, stable platform, distributed POS (Position and Orientation System) and cabin.
Described carrier aircraft platform is for carrying unit in described stable platform, antenna system and cabin.
Described stable platform is equipped on described carrier aircraft platform, stablizes for carrying out wave beam to Ka wave band dual-mode antenna group and points to control.According to a preferred embodiment of the present invention, it is LH system PAV series stable platform, high-performance, the high reliability aviation gyrostabilized platform of the development of Shi Laika company.
According to the present invention, described antenna system is distributed in described carrier aircraft platform, and can to ground receiving and transmitting signal.Thus, described carrier aircraft platform should have enough spaces to carry described antenna system, and enables antenna system to ground receiving and transmitting signal.
According to the present invention, described antenna system comprises a main dual-mode antenna of L-band, two secondary dual-mode antennas of L-band and a Ka wave band dual-mode antenna group.Secondary dual-mode antenna is distributed is equipped on described carrier aircraft platform for the main dual-mode antenna of described L-band and two L-bands, and forms flexible Long baselines and interfere relation, for obtaining high-precision landform altitude information; Described Ka wave band dual-mode antenna group is equipped on described stable platform, for obtaining high precision Vegetation canopy elevation information.
Distributed POS of the present invention by three independently POS form, its respectively with main dual-mode antenna of L-band and two L-bands pair are sent out and are received together with astronomical cycle, for measuring the position of three antennas between operational period and attitude information.
In described cabin, unit ensures other conventional equipments needed for system cloud gray model, such as, comprise display, industrial computer, power module, GPS and battery, data recording equipment etc.
Referring to Fig. 1, a specific embodiment of the present invention is described.
In this embodiment of the invention, described carrier aircraft platform is aircraft as shown in Figure 1, such as transporter etc.But, according to the present invention, described carrier aircraft platform can be any can at the aircraft of liftoff 2 ~ 3.5km smooth flight.
As previously mentioned, carrier aircraft platform of the present invention is for carrying unit in described stable platform, antenna system and cabin, and therefore it should have position and the region of unit and stable platform in the above-mentioned antenna system of arrangement, cabin.
In this embodiment, the aircraft shown in Fig. 1 can carry gondola below its wing, to install the secondary dual-mode antenna of L-band; Described stable platform and the main dual-mode antenna of L-band is carried in the ventral position of described aircraft, stable platform is laid Ka wave band dual-mode antenna group, and, an optical window is had downwards, so that the main dual-mode antenna of this L-band and Ka wave band dual-mode antenna group are to ground receiving and transmitting signal at the ventral of aircraft.
A preferred embodiment of the invention, as shown in Figure 4, can carry the gondola installing the secondary dual-mode antenna of L-band in the auxiliary fuel tank position of the wing of aircraft, on the floor in cabin, device has slide rail, installs unit in cabin to facilitate.
A preferred embodiment of the invention, the main dual-mode antenna of described L-band passes through a switching mechanism carry under ventral, described switching mechanism is one and is articulated in the physical construction can carrying out left and right turning operation below ventral in certain angle, the main dual-mode antenna of this L-band can be made on a left side depending on switching depending under pattern with the right side by the left and right turning operation of this switching mechanism, can respectively with two there is independent left interfere relation depending on forming flexible Long baselines with the secondary dual-mode antenna of the L-band of right visual function.
A preferred embodiment of the invention, the major and minor dual-mode antenna of described L-band all adopts complete polarization antenna, and sweeps mutually to employing in orientation, utilizes the orientation of phase control wave beam to sensing, to solve the problem that aircraft drift angle is brought imaging.
A preferred embodiment of the invention, described Ka wave band dual-mode antenna group adopts the many baseline configuration mountings of rigidity to be arranged on stable platform, the transmitting and receiving of settling signal under ventral.Described Ka wave band dual-mode antenna group comprises transmitter, this transmitter adopts travelling-wave tube (TWT) amplifier to realize high power transmission, distance is adopted to ensure fabric width to broad beam antenna, it is stable and point to and control that the integral installation of Ka wave band dual-mode antenna group realizes wave beam on stable platform, by stable platform rotate realize a left side depending on or the right side look.Described stable platform comprises a rotating mechanism, and for realizing a left side for Ka wave band antenna group depending on looking control with the right side, this Ka wave band antenna group and rotating mechanism adopt rectification voluntarily, no longer adopt traditional antenna house method for rectifying.
Describing referring to Fig. 2 utilizes above-mentioned airborne two waveband interference synthetic aperture radar system of the present invention to measure the method for vegetation thickness information.
First, major and minor for described L-band dual-mode antenna baseline is considered as flexible Long baselines, utilizes the distributed POS of three nodes to measure the position of three antenna phase centers, obtain the varying information of antenna phase center during imaging.The concept of flexible baseline can be utilized during late time data process to carry out interference treatment.Described Ka wave band dual-mode antenna adopts many baseline configuration rigidity to connect firmly, and is arranged on stable platform, realizes wave beam and stablizes and point to control.
Then, described radar system carries out flight operation and ground data process.During ground data process, to the signal combination POS data imaging processing respectively that each road antenna receives, imaging processing is known technology.
Then, utilize L-band radar signal to the penetration capacity of vegetation, polarization interference process is carried out to described L-band imaging results, obtain target scene DTM (Digital Terrain Model, digital terrain model); Utilize Ka band radar signal to the characteristic of Vegetation canopy echo sensitivity, interference treatment is carried out to described Ka wave band imaging results, obtain target scene DSM (Digital Surface Model, digital watch layer model).Obtain the identical scaling point needing in the process of DTM with DSM to utilize in two figure, as the target that highway, buildings etc. all can display in two band images.Specific implementation method composition graphs 3 is described below:
Interferometric phase can be expressed as
In formula, λ is carrier wavelength, the interference of two antennas when k=1 represents Ka wave band multicast; The interference of two antennas when k=2 represents L-band ping pong scheme.
Elevation inversion formula is:
In formula, H represents carrier aircraft height.To the measuring error σ of parameter H, B, R, φ and α
h, σ
b, σ
r, σ
φand σ
α, all can cause measurement of higher degree error.The vertical error component that these five parameters cause can be tried to achieve by differential:
The measurement of higher degree extent by mistake that each parametric error causes can be estimated thus.
It is to be noted: during L-band signal transacting, according to the varying information of the antenna phase center of POS record, the varying information of base length and angle can be obtained, do not need during interference treatment to use conventional methods antenna trace is compensated into two parallel lines, can interferometric phase image be obtained.Time the baseline that becomes by sometimes become vertical accuracy, elevation sensitivity and not fuzzy elevation.
Finally, according to described DTM and DSM that above-mentioned steps obtains, the two subtracts each other, and can obtain the vegetation thickness information of target scene.
For airborne two waveband synthetic-aperture radar vegetation method for measuring thickness of the present invention, below to transport 12 as carrier aircraft platform, the performance informations such as the systematic parameter of analysis radar when the present invention is based on fortune 12 platform and vertical accuracy, not fuzzy elevation.As a specific embodiment of the present invention, Fig. 4 gives to transport 12 as the aircraft configuration structure of carrier aircraft platform and antenna mounting locations schematic diagram.
Transport 12 aeroplane span 19.2m, main cabin height 1.96m, auxiliary fuel tank is positioned in the middle part of wing, and each load-bearing 200kg, aircraft cruising altitude 3km, ventral has the optical window with PAV platform adaptation.Transport 12 aircrafts and carry two waveband vegetation thickness measure polarization sensitive synthetic aperture radar system parameter and Height Accuracy Analysis result such as shown in table 1 to table 3.
Table 1. two waveband InSAR systematic parameter
The table 2.L each parametric error of wave band InSAR and corresponding vertical error component
The table 3.Ka each parametric error of wave band InSAR and corresponding vertical error component
According to the result of table 2 and table 3, the elevation of the DTM that L-band polarization interference obtains can be designed to 1.4m; Ka wave band interferes the vertical accuracy of the DSM obtained to be designed to 0.5m.Based on the analysis of above vertical accuracy, when the present invention is to transport 12 aircrafts as carrier aircraft platform, 2m can be better than to the estimated accuracy of vegetation thickness.
When P point is constant to the distance of antenna, and when highly raising h, according to geometric relationship, being changed to of interferometric phase:
Elevation sensitivity is:
not fuzzy elevation is:
Under the systematic parameter of table 1, the elevation sensitivity that L-band is operated in the acquisition of ping pong scheme imaged interference is 0.046rad/m, and not fuzzy elevation is 135.9m; Ka wave band multicast mode imaging interferes the elevation sensitivity obtained to be 0.194rad/m, and not fuzzy elevation is 32.0m.The not fuzzy elevation of Ka wave band can expand to required scope by many baselines.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an airborne two waveband interference synthetic aperture radar system, comprises carrier aircraft platform, antenna system, stable platform and distributed POS, it is characterized in that,
Described antenna system comprises a main dual-mode antenna of L-band, two secondary dual-mode antennas of L-band and a Ka wave band dual-mode antenna group;
Secondary dual-mode antenna is distributed is equipped on described carrier aircraft platform for the main dual-mode antenna of described L-band and two L-bands, and forms flexible Long baselines and interfere relation, for obtaining landform altitude information;
Described Ka wave band dual-mode antenna group is equipped on described stable platform, for obtaining Vegetation canopy elevation information; Wherein
Described landform altitude information and described Vegetation canopy elevation information carry out subtracting each other and can obtain vegetation thickness.
2. airborne two waveband interference synthetic aperture radar system as claimed in claim 1, it is characterized in that, described distributed POS by three independently POS form, it is sent out with the main dual-mode antenna of described L-band and described two L-bands pair respectively and receives together with astronomical cycle, for measuring the position of three antennas between operational period and attitude information.
3. airborne two waveband interference synthetic aperture radar system as claimed in claim 1, it is characterized in that, described carrier aircraft platform is an aircraft, carry gondola below the wing of this aircraft, and this gondola is for installing the secondary dual-mode antenna of described L-band;
Further, carry described stable platform and the main dual-mode antenna of L-band in the ventral position of described aircraft, stable platform is laid Ka wave band dual-mode antenna group.
4. airborne two waveband interference synthetic aperture radar system as claimed in claim 3, is characterized in that, have an optical window downwards at the ventral of described aircraft, so that the main dual-mode antenna of described L-band and Ka wave band dual-mode antenna group are to ground receiving and transmitting signal.
5. airborne two waveband interference synthetic aperture radar system as claimed in claim 3, is characterized in that, described Ka wave band dual-mode antenna group adopts the many baseline configuration mountings of rigidity to be arranged on stable platform.
6. airborne two waveband interference synthetic aperture radar system as claimed in claim 1, it is characterized in that, the major and minor dual-mode antenna of described L-band all adopts complete polarization antenna, and sweeps mutually to employing in orientation, utilize the orientation of phase control wave beam to sensing, to eliminate the impact of aircraft drift angle.
7. airborne two waveband interference synthetic aperture radar system as claimed in claim 1, is characterized in that, what the transmitter of described Ka wave band dual-mode antenna group adopted is travelling-wave tube amplifier (TWTA).
8. airborne two waveband interference synthetic aperture radar system as claimed in claim 7, is characterized in that, described Ka wave band dual-mode antenna group is made up of to broad beam antenna distance.
9. airborne two waveband interference synthetic aperture radar system as claimed in claim 8, it is characterized in that, described stable platform comprises a rotating mechanism, and for realizing a left side for Ka wave band antenna group depending on looking control with the right side, described Ka wave band antenna group and this rotating mechanism all adopt rectification voluntarily.
10. one kind utilizes airborne two waveband interference synthetic aperture radar system according to any one of claim 1 to 9 to measure the method for vegetation thickness information, described airborne two waveband interference synthetic aperture radar system comprises carrier aircraft platform, antenna system, stable platform and distributed POS, described antenna system comprises a main dual-mode antenna of L-band, two secondary dual-mode antennas of L-band and a Ka wave band dual-mode antenna group, secondary dual-mode antenna is distributed is equipped on described carrier aircraft platform for the main dual-mode antenna of described L-band and two L-bands, and form flexible Long baselines and interfere relation, described Ka wave band dual-mode antenna group is equipped on described stable platform, it is characterized in that, described method comprises the steps:
First, using major and minor for described L-band dual-mode antenna baseline as flexible Long baselines, distributed POS is utilized to measure the position of these three antenna phase centers, obtain the varying information of antenna phase center during imaging, meanwhile, described Ka wave band dual-mode antenna group utilized described stable platform to carry out wave beam stablize and point to control;
Then, described radar system is carried out flight operation, and the signal combination POS data that each antenna is received imaging processing respectively;
Then, polarization interference process is carried out to the imaging results of described L-band, obtain target scene DTM, and interference treatment is carried out to described Ka wave band imaging results, obtain target scene DSM;
Finally, the numerical value of described target scene DTM and the numerical value of target scene DSM are carried out subtracting each other the vegetation thickness information obtaining target scene.
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| CN104316925B (en) * | 2014-11-11 | 2017-02-22 | 武汉大学 | Azimuth synthetic aperture radar system based on rotatable antennas |
| CN104986348B (en) * | 2015-06-23 | 2017-03-08 | 中国航空工业集团公司西安飞机设计研究所 | A kind of radar assembly and the aircraft with which |
| ES2639687B8 (en) * | 2017-03-03 | 2018-03-07 | Universidad De Oviedo | Airborne system and method for the characterization and measurement of antennas or radiating systems |
| CN106908793A (en) * | 2017-04-17 | 2017-06-30 | 王辉 | Ka wave band along-trade INSAR systems and its method of work |
| CN110794372A (en) * | 2019-11-12 | 2020-02-14 | 长沙莫之比智能科技有限公司 | Millimeter wave radar and unmanned aerial vehicle multi-target height measurement method based on millimeter wave radar |
| CN114594478B (en) * | 2022-03-17 | 2022-11-25 | 北京卫星信息工程研究所 | Ship target interference detection method based on satellite-borne Ka-band SAR system |
| CN115291218B (en) * | 2022-10-10 | 2022-12-09 | 中国电子科技集团公司第十四研究所 | Homologous common-view multiband interference SAR test system |
| CN115343712B (en) * | 2022-10-18 | 2022-12-20 | 中国电子科技集团公司第十四研究所 | High-low frequency polarization interference test system for inversion of vegetation elevation |
| CN117434517B (en) * | 2023-12-21 | 2024-02-27 | 西南林业大学 | Forest canopy height estimation method based on extinction coefficient optimization |
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| "High-resolution dual-bands interferometrc and polarimetric airborne SAR (Pi-SAR)and its applications";Seiho Uratsuka et al.;《Geoscience and Remote Sensing Symposium,2002.IGARSS’02.2002 IEEE International(Volume:3)》;20020628;第3卷;第1720-1722页 * |
| "机载SAR发展概况";曲长文 等;《现代雷达》;20020131;第24卷(第1期);第1-10、14页 * |
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