CN107271995A - The system sensitivity Optimization Design adjusted based on beam position - Google Patents

The system sensitivity Optimization Design adjusted based on beam position Download PDF

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Publication number
CN107271995A
CN107271995A CN201710353390.4A CN201710353390A CN107271995A CN 107271995 A CN107271995 A CN 107271995A CN 201710353390 A CN201710353390 A CN 201710353390A CN 107271995 A CN107271995 A CN 107271995A
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CN
China
Prior art keywords
system sensitivity
beam position
adjustment
design
adjusted based
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201710353390.4A
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Chinese (zh)
Inventor
路瑞峰
刘艳阳
魏春
张丙良
徐敏
陈筠力
余辉
杨勇
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Shanghai Institute of Satellite Engineering
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Shanghai Institute of Satellite Engineering
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Application filed by Shanghai Institute of Satellite Engineering filed Critical Shanghai Institute of Satellite Engineering
Priority to CN201710353390.4A priority Critical patent/CN107271995A/en
Publication of CN107271995A publication Critical patent/CN107271995A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
    • G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
    • G01S13/904—SAR modes

Abstract

The invention discloses a kind of system sensitivity Optimization Design adjusted based on beam position, it comprises the following steps：Step one, Beam position design is carried out according to systematic parameter；Step 2, calculates each ripple position system sensitivity；Step 3, calculates beam position adjustment amount；Step 4, according to new beam position design direction figure；Step 5, calculates the system sensitivity after adjustment.The present invention can solve in SAR system design that system sensitivity is the problem of proximally and distally difference is big to a certain extent, and at low incidence angle, effect is especially notable, and then effective guarantee SAR system earth observation performance.

Description

The system sensitivity Optimization Design adjusted based on beam position
Technical field
New method is designed the present invention relates to one kind, more particularly to a kind of system sensitivity based on beam position adjustment is excellent Change design method.
Background technology
Synthetic aperture radar (Synthetic Aperture Radar, SAR) is because of the round-the-clock high-resolution pair of its round-the-clock Ground observing capacity is widely used in military and civil area, such as battlefield investigation, marine monitoring, agricultural census and landform Mapping etc..System sensitivity is one of leading indicator of SAR image application, and it is reflected after synthetic aperture radar can be imaged To scattering coefficient lower limit.System sensitivity characterizes observing capacity of the satellite to Weak target, is reflection SAR image signal to noise ratio Important indicator, thus be also the key factor for needing in Spaceborne SAR System parameter designing to consider.
System sensitivity and peak transmitted power, transmission signal pulse width, antenna gain, pulse recurrence frequency, incidence The factors such as angle, signal bandwidth, wavelength are related, and the optimization of system sensitivity is a complicated system engineering.Typically can be with Improve system sensitivity index by improving antenna gain, improving the methods such as antenna efficiency, increase peak transmitted power, but it is above-mentioned Method is limited by the satellite energy, weight, antenna size etc., and cost is higher.
With the development of Synthetic Aperture Radar Technique, the application of New System emerges in an endless stream, and such as interference synthetic aperture radar is high Degree meter etc., it is proposed that the observation requirementses at low visual angle, but during low visual angle, traditional design method system sensitivity becomes in angular field of view Change acutely, proximally and distally difference substantially, causes the problems such as picture quality is uneven, how to improve system sensitivity and need emphasis badly Conduct a research.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of optimized based on the system sensitivity that beam position is adjusted and set Meter method, it can solve in SAR system design system sensitivity to a certain extent the problem of proximally and distally difference is big, Effect is especially notable during low incidence angle, and then effective guarantee SAR system earth observation performance.
The present invention is to solve above-mentioned technical problem by following technical proposals：It is a kind of to be based on what beam position was adjusted System sensitivity optimization design method, it comprises the following steps：
Step one, Beam position design is carried out according to systematic parameter；
Step 2, calculates each ripple position system sensitivity；
Step 3, calculates beam position adjustment amount；
Step 4, according to new beam position design direction figure；
Step 5, calculates the system sensitivity after adjustment.
Preferably, systematic parameter of the step one according to Preliminary design, carries out Beam position design, determines the PRF of each ripple position And angular field of view.
Preferably, the step 2 is shown below according to systematic parameter and pattern data calculates the system spirit of each ripple position Sensitivity,
Wherein k is Boltzmann constant, and k takes 1.38 × 10-23J/K；T is satellite-borne SAR reception system noise temperature；Fn is The noise coefficient of whole receiving channel；L is loss, and L includes system loss and atmospheric loss etc.；B is linear FM signal bandwidth； vsFor satellite velocities；R is oblique distance of the SAR antenna phase centers to atural object；θiFor incidence angle；λ refers to carrier wavelength；PtRepresent peak value Transmission power；τpRepresent transmission signal pulse width；Gt and Gr refer to antenna transmitting gain and reception gain respectively；fpFor pulse weight Complex frequency；C is the light velocity.
Preferably, the step 3 is all mutually optimization mesh with distal end visual angle system sensitivity with near-end visual angle system sensitivity Scalar functions, using center downwards angle of visibility as initial value, search calculates each ripple position beam position adjustment amount, and beam center is oriented to after adjustment θL1。
Preferably, the step 4 points to θ according to the beam center after adjustmentL1Design direction figure, the starting visual angle of ripple position And it is identical before terminating visual angle and adjusting.
Preferably, the step 5 is calculated beam center sensing according to above formula (1) and adjusted using the directional diagram after adjustment The system sensitivity of whole rear each ripple position, the system sensitivity of each ripple position after adjustment.
The positive effect of the present invention is：The present invention can propose to adjust the method optimization system that beam center is pointed to Sensitivity, can propose to need system hardware without extra based on the system sensitivity Optimization Design that beam center points to adjustment Ask, in small angle, improvement is more obvious.
Brief description of the drawings
Fig. 1 is schematic flow sheet of the invention.
Fig. 2 is each ripple position system sensitivity curve map before optimization.
Fig. 3 is each ripple position system sensitivity curve map after optimization.
Embodiment
Present pre-ferred embodiments are provided below in conjunction with the accompanying drawings, to describe technical scheme in detail.
As shown in figure 1, the present invention is comprised the following steps based on the system sensitivity Optimization Design that beam position is adjusted：
Step one, Beam position design is carried out according to systematic parameter；
Step 2, calculates each ripple position system sensitivity；
Step 3, calculates beam position adjustment amount；
Step 4, according to new beam position design direction figure；
Step 5, calculates the system sensitivity after adjustment.
The step one is as shown in table 1 below according to the systematic parameter of Preliminary design, carries out Beam position design, determines each ripple position PRF (pulse recurrence frequency, pulse recurrence frequency) and angular field of view.
Table 1
The system that the step 2 calculates each ripple position according to systematic parameter and pattern data such as following formula (1) is sensitive Degree,
Wherein k is Boltzmann constant, and k takes 1.38 × 10-23J/K；T is satellite-borne SAR reception system noise temperature；Fn is The noise coefficient of whole receiving channel；L is loss, and L includes system loss and atmospheric loss etc.；B is linear FM signal bandwidth； vsFor satellite velocities；R is oblique distance of the SAR antenna phase centers to atural object；θiFor incidence angle；λ refers to carrier wavelength；PtRepresent peak value Transmission power；τpRepresent transmission signal pulse width；Gt and Gr refer to antenna transmitting gain and reception gain respectively；fpFor pulse weight Complex frequency；C is the light velocity.
The step 3 is all mutually optimization object function with distal end visual angle system sensitivity with near-end visual angle system sensitivity, Using center downwards angle of visibility as initial value, each ripple position beam position adjustment amount of search calculating is as shown in table 2 below, and beam center is pointed to after adjustment For θL1。
Table 2
The step 4 points to θ according to the beam center after adjustmentL1Design direction figure, the starting visual angle of ripple position and end are regarded Angle is identical with before adjustment.
The step 5 calculates each after beam center sensing adjustment using the directional diagram after adjustment according to above formula (1) The system sensitivity of ripple position, the system sensitivity of each ripple position is as shown in table 3 below after adjustment.
Table 3
Each ripple position system sensitivity is shown in Fig. 2 before optimization, and each ripple position system sensitivity is shown in Fig. 3 after optimization.
Particular embodiments described above, technical problem, technical scheme and beneficial effect to the solution of the present invention are carried out It is further described, should be understood that the specific embodiment that the foregoing is only of the invention, be not limited to The present invention, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc. should be included in this Within the protection domain of invention.

Claims (6)

1. a kind of system sensitivity Optimization Design adjusted based on beam position, it is characterised in that it comprises the following steps：
Step one, Beam position design is carried out according to systematic parameter；
Step 2, calculates each ripple position system sensitivity；
Step 3, calculates beam position adjustment amount；
Step 4, according to new beam position design direction figure；
Step 5, calculates the system sensitivity after adjustment.
2. the system sensitivity Optimization Design as claimed in claim 1 adjusted based on beam position, it is characterised in that institute Systematic parameter of the step one according to Preliminary design is stated, Beam position design is carried out, the PRF and angular field of view of each ripple position is determined.
3. the system sensitivity Optimization Design as claimed in claim 1 adjusted based on beam position, it is characterised in that institute Step 2 is stated according to systematic parameter and pattern data such asIt is shown to calculate each ripple The system sensitivity of position, wherein k is Boltzmann constant, and k takes 1.38 × 10-23J/K；T is satellite-borne SAR reception system noise temperature Degree；Fn is the noise coefficient of whole receiving channel；L is loss, and L includes system loss and atmospheric loss etc.；B believes for linear frequency modulation Number bandwidth；vsFor satellite velocities；R is oblique distance of the SAR antenna phase centers to atural object；θiFor incidence angle；λ refers to carrier wavelength；PtTable Show peak transmitted power；τpRepresent transmission signal pulse width；Gt and Gr refer to antenna transmitting gain and reception gain respectively；fpFor Pulse recurrence frequency；C is the light velocity.
4. the system sensitivity Optimization Design as claimed in claim 1 adjusted based on beam position, it is characterised in that institute It is all mutually optimization object function with distal end visual angle system sensitivity that step 3, which is stated, with near-end visual angle system sensitivity, to be regarded under center Angle is initial value, and search calculates each ripple position beam position adjustment amount, and beam center is oriented to θ after adjustmentL1。
5. the system sensitivity Optimization Design as claimed in claim 1 adjusted based on beam position, it is characterised in that institute State step 4 and point to θ according to the beam center after adjustmentL1Before design direction figure, the starting visual angle and end visual angle of ripple position and adjustment It is identical.
6. the system sensitivity Optimization Design as claimed in claim 1 adjusted based on beam position, it is characterised in that institute State step 5 and utilize the directional diagram after adjustment, according toShown calculating beam center The system sensitivity of each ripple position after adjustment is pointed to, the system sensitivity of each ripple position after adjustment.
CN201710353390.4A 2017-05-18 2017-05-18 The system sensitivity Optimization Design adjusted based on beam position Pending CN107271995A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108983186A (en) * 2018-07-03 2018-12-11 中国科学院国家空间科学中心 A kind of spaceborne interference imaging altimeter PRF method of real-time adjustment
CN109782278A (en) * 2019-01-08 2019-05-21 上海卫星工程研究所 Interference synthetic aperture radar altimeter beam center is directed toward design method and system
CN110515078A (en) * 2019-07-27 2019-11-29 西南电子技术研究所（中国电子科技集团公司第十研究所） Beam position design method for airspace covering
CN116859344A (en) * 2023-08-28 2023-10-10 中国电子科技集团公司第十四研究所 Energy spectrum self-adaptive distributed InSAR spatial synchronization method oriented to coherent optimization

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CN101388723A (en) * 2008-10-28 2009-03-18 重庆重邮信科通信技术有限公司 Radio communication timing synchronization method, cell searching method and system
CN103576153A (en) * 2013-11-22 2014-02-12 中国科学院电子学研究所 Azimuth multi-beam SAR (synthetic aperture radar) and implementation method and device of SAR
CN103744080A (en) * 2014-01-16 2014-04-23 中国科学院电子学研究所 Satellite-borne multi-channel synthetic aperture radar imaging device
CN104035094A (en) * 2014-06-25 2014-09-10 内蒙古工业大学 Method and device for receiving range multiple-aperture wide-width satelliteborne SAR (synthetic aperture radar) echoes
CN106597385A (en) * 2016-11-11 2017-04-26 西安电子工程研究所 Helicopter radar data link integrated radio frequency design method

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Publication number Priority date Publication date Assignee Title
DE19822848A1 (en) * 1998-05-22 1999-11-25 Deutsch Zentr Luft & Raumfahrt Method for the transmission of compressed image data of a SAR radar
CN101388723A (en) * 2008-10-28 2009-03-18 重庆重邮信科通信技术有限公司 Radio communication timing synchronization method, cell searching method and system
CN103576153A (en) * 2013-11-22 2014-02-12 中国科学院电子学研究所 Azimuth multi-beam SAR (synthetic aperture radar) and implementation method and device of SAR
CN103744080A (en) * 2014-01-16 2014-04-23 中国科学院电子学研究所 Satellite-borne multi-channel synthetic aperture radar imaging device
CN104035094A (en) * 2014-06-25 2014-09-10 内蒙古工业大学 Method and device for receiving range multiple-aperture wide-width satelliteborne SAR (synthetic aperture radar) echoes
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108983186A (en) * 2018-07-03 2018-12-11 中国科学院国家空间科学中心 A kind of spaceborne interference imaging altimeter PRF method of real-time adjustment
CN109782278A (en) * 2019-01-08 2019-05-21 上海卫星工程研究所 Interference synthetic aperture radar altimeter beam center is directed toward design method and system
CN110515078A (en) * 2019-07-27 2019-11-29 西南电子技术研究所（中国电子科技集团公司第十研究所） Beam position design method for airspace covering
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CN116859344A (en) * 2023-08-28 2023-10-10 中国电子科技集团公司第十四研究所 Energy spectrum self-adaptive distributed InSAR spatial synchronization method oriented to coherent optimization
CN116859344B (en) * 2023-08-28 2023-11-03 中国电子科技集团公司第十四研究所 Energy spectrum self-adaptive distributed InSAR spatial synchronization method oriented to coherent optimization

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Application publication date: 20171020