St>-T*-4*-te.» ESD RECORD COPY. ,om*' ESD ACCESSION LIST ESTI Call M - 4H THIRD QUARTERLY TECHNICAL REPORT October to 30 December 1967
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1 St>-T*-4*-te.» THIRD QUARTERLY TECHNICAL REPORT October to 30 December 1967 January 1968 ESD RECORD COPY RETURN TO SCIENTIFIC & TECHNICAL INFORMATION DIVISION (ESTI), BUILDING 1211 ESD ACCESSION LIST ESTI Call M - 4H Copy No. / of / cys. DEPUTY FOR SURVEILLANCE AND CONTROL SYSTEMS ELECTRONIC SYSTEMS DIVISION AIR FORCE SYSTEMS COMMAND UNITED STATES AIR FORCE L. G. Hanscom Field, Bedford, Massachusetts This document has been approved for public release and sale; its distribution is unlimited., (Prepared under Contract No. AF l9(628)-67-c-0308 by The Ohio State University, ElectroScience Laboratory, Department of Electrical Engineering, 1320 Ktnnear Road, Columbus, Ohio.),oM*'
2 LEGAL NOTICE When U.S. Government drawings, specifications or other data are used for any purpose other than a definitely related government procurement operation, the government thereby incurs no responsibility nor any obligation whatsoever; and the fact that the government may have formulated, furnished, or in any way supplied the said drawings, specifications, or other data is not to be regarded by implication or otherwise as in any manner licensing the holder or any other person or conveying any rights or permission to manufacture, use, or sell any patented invention that may in any way be related thereto. OTHER NOTICES Do not return this copy. Retain or destroy.
3 LEGAL NOTICE When U.S. Government drawings, specifications or other data are used for any purpose other than a definitely related government procurement operation, the government thereby incurs no responsibility nor any obligation whatsoever; and the fact that the government may have formulated, furnished, or in any way supplied the said drawings, specifications, or other data is not to be regarded by implication or otherwise as in any manner licensing the holder or any other person or conveying any rights or permission to manufacture, use, or sell any patented invention that may in any way be related thereto. OTHER NOTICES Do not return this copy. Retain or destroy.
4 csd-f*-4f-/f3 THIRD QUARTERLY TECHNICAL REPORT October to 30 December 1967 January 1968 DEPUTY FOR SURVEILLANCE AND CONTROL SYSTEMS ELECTRONIC SYSTEMS DIVISION AIR FORCE SYSTEMS COMMAND UNITED STATES AIR FORCE L. G. Hanscom Field, Bedford, Massachusetts This document has been approved for public release and sale; its distribution is unlimited. (Prepared under Contract No. AF I9(628)-67-C-0308 by The Ohio State University, ElectroScfence Laboratory, Department of Electrical Engineering, 1320 Ktnnear Road, Columbus, Ohio.)
5 FOREWORD The report, OSURF report number , was prepared by The Ohio State University ElectroScience Laboratory, Department of Electrical Engineering, 1320 Kinnear Road, Columbus, Ohio. Research was conducted under Contract F C Lt. Nyman was the Electronic Systems Division Program Monitor for this research. This report covers the period from 1 October to 30 December This technical report has been reviewed and approved 9 February BERNARD J. FILLIATREAULT Contracting Officer Space Defense System Program Office ii
6 ABSTRACT This report outlines the progress in the past quarter in developing a computer program for direct scattering calculations. in
7 TABLE OF CONTENTS Page GOALS I II. PROGRESS WITH THE PHYSICAL OPTICS FORMULATION III. PROGRESS WITH THE GEOMETRICAL THEORY OF DIFFRACTION APPENDIX I - PHYSICAL OPTICS TEST RESULTS REFERENCES 10 IV
8 I GOALS Our purpose is to develop new theoretical and computational techniques for electromagnetic scattering. The end result will be a digital computer program designed to calculate the scattering properties of a wide class of targets. II. PROGRESS WITH THE PHYSICAL OPTICS FORMULATION A physical-optics scattering program was developed to read in the coordinates (x, y, z) of many points on the target surface and to calculate the projected area function, the CW scattering matrix, and the pulse response foi the bistatic case. The program was tested for spheres with excellent results. Testing will proceed for targets of other shapes. The details of the physical-optics formulation are given in Report Z430-Z. Test results for the sphere are given in Appendix I. III. PROGRESS WITH THE GEOMETRICAL THEORY OF DIFFRACTION A computer program was developed for backscattering from perfectly conducting bodies of revolution. This program includes the scattering contributions from geometrical optics, creeping waves and wedge diffraction at the junctions of the analytic subsections of the target. The subroutines for the geometrical optics and creeping wave contributions were developed earlier in the contract period. In the past quarter, the wedge diffraction subroutine was developed and is now being tested. A flow diagram of the wedge diffraction subroutine is shown in Fig. 1. Section 102 identifies the locations and included angles of any "wedges" on the target. (Here "wedge" is used to refer to a slope discontinuity at the junction of subsections of the target.) Section 103 identifies any planes, cones and cylinders that may exist as subsections of the target surface. Next a loop is entered to increment the incidence angle and the wavelength. In this loop two tests are made in Sections 105 and 106. If the incident propagation axis is nearly parallel with the axis of the target, the wedge contributions are computed in Section 109 using Bessel functions. If the propagation axis is almost perpendicular to the surface of a plane, cone, or cylinder, the contribution is calculated
9 in Section 110 using the (sin X)/X function. The contributions from any remaining wedges are then computed and summed. Finally the elements of the scattering matrix are computed in Section 108. This wedge diffraction subroutine is undergoing tests with cones, cylinders and cone-cylinders. The details of the formulation using the geometrical theory of diffraction are presented in Report Z
10 100 10: I 102 READ TARGET GEOMETRY READ X, 0, AX. A0 I3Z DETERMINE WEDGE LOCATIONS AND INCLUDED ANGLES IDENTIFY PLANES, CONES AND CYLINDERS 104 I DO 108 ON X,0 I 105 TEST FOR 0 NEAR AXIS 106 NO TEST FOR SPECULAR REGION, TNö 107 SUM WEDGE CONTRIBUTIONS m ^Yl 109 COMPUTE FIELD USING BESSEL FCT no COMPUTE FIELD USING SIN (X)/X PATTERN FCT ill ADD WEDGE CONTRIBUTIONS 112 X ADD WEDGE CONTRIBUTIONS 108 COMPUTE ELEMENTS OF SCATTERING MATRIX Fig. 1. Flow diagram for the wedge diffraction subroutine
11 APPENDIX I PHYSICAL OPTICS TEST RESULTS The physical optics computer program has been tested with spherical and spheroidal targets with excellent results. The following targets are being considered for additional tests: ogive, cone, cylinder, combinations of the above shapes, and a tetrahedron. The test results for the sphere are displayed in Figs. 2 through 5. In each figure, the dots represent the output data from the computer program. The input data for these computations included the coordinates (x, y, z) of 1083 points distributed almost uniformly over the surface of the sphere. In Fig. 2 the computer output data shows good agreement with the physical optics data given by the solid curve. Better results could be obtained by including a larger number of points in the input data describing the target surface. The solid curve in Fig. 2 is based on 0 the following expression for physical-optics backscatter from a sphere with radius "a". TT i j2ka,2 (1) ir= -V l(j+ 2ka ) e -jl 4k where k = 2TT/\. Figure 3 shows backscatter results for the sphere as a function of the aspect angle. For a true sphere, the echo area is of course independent of aspect angle. Thus, the variations in the computer output data arise from the fact that the computer is programmed to approximate the spherical target with a polyhedron. Again, these variations could be reduced by specifying a larger number of points on the surface. Figures 4 and 5 display the results for bistatic scattering from a sphere. The solid curves, shown for comparison, were obtained from the following expressions: f 71 "/ 2, jka(l+cos 0 S ) cos 0 (2) S = ka \ sin 9 Jj(ka sin 0 sin G s )e d6 (3) S y = 0 0
12 /2 (I) s z = -jka* J* sin 0 cos 9 J 0 fka sin 9 sin 9 S ) e Jk&( 1+C S 9s)C S 9 de 0 (5) S n = -S x sin 9 S - S z cos 9 g (6) S 2E = -S z (7) or 11 =4 1T S 11 2 (8) a 22 = 4-TT S 22 I' where J 0 and Jj represent the Bessel functions. These equations represent the physical optics solution for the sphere under the conditions illustrated in Figs. 4 and 5, where 9^ = fy^ - 4> s = 0. The results shown in Figs. 2-5 demonstrate that the direct scattering computer program gives acceptable physical-optics data for spherical targets at frequencies up to 609 MHz when the input data includes at least 1909 points on the surface. This indicates that at least 29 points will probably be required for each square wavelength on any smooth target. The short-pulse response has also been calculated for the sphere, with excellent results. These waveforms will be included in a future report.
13 < LÜ (X. < o X CJ ÜJ FREQUENCY (MHz) 600 Fig. 2. Backscatter versus frequency for sphere.
14 < Id et < o x o PHYSICAL OPTICS COMPUTER OUTPUT SPHERE RADIUS = Im f = 300MHz BACKSCATTER 0i = 4>r0 8 = * B,(j) (DEGREES) Fig. 3. Backscatter versus aspect for sphere.
15 100 < üü er < o X o UJ S (DEGREES) Fig. 4. Bistatic scattering from sphere (E plane).
16 100 < er < o X u LiJ S (DEGREES) 200 Fig. 5. Bistatic scattering from sphere (H plane).
17 REFERENCES 1. Ryan, CE., Jr., "Memorandum Analysis of Echo Area of Targets Using Geometrical Theory of Diffraction and Creeping Wave Theory, " Report , July 1967, ElectroScience Laboratory, The Ohio State University Research Foundation; prepared under Contract Fl C-Ü308 for Electronics Systems Division, Air Force Systems Command, Bedford, Massachusetts. 2. Second Quarterly Technical Report, 1 July to 30 September 1967, Report , October 1967, ElectroScience Laboratory, The Ohio State University Research Foundation; prepared under Contract F C-0308 for Electronics Systems Division, Air Force Systems Command, Bedford, Massachusetts. 10
18 UNCLASSIFIED Security Classification DOCUMENT CONTROL DATA R&D (Security classification of title, body of abstract and indexing annotation must be entered when the overall report is classified) ORIGINATING ACTIVITY (Corporate author) The OhlO State University] 20. REPORT SECURITY CLASSIFICATION ElectroScience Laboratory, Department of Electrica] Engineering, 1320 Kinnear Road, Columbus, Ohio 3. REPORT TITLE THIRD QUARTERLY TECHNICAL REPORT - Z DESCRIPTIVE NOTES (Type of report and inclusive dates) Quarterly Report, 1 October to 30 December 1967 S. AUTHORfS,* (Last name, first name, initial) Unclassified N/A 6. REPORT DATE January U. CONTRACT OR GRANT NO. F C-030J b. PROJECT NO. 7a. TOTAL NO. OF PAGES JO TK 9a. ORIGINATOR'S REPORT NUMBEP/SJ ESD-TR NO. OF REFS 2 9b. OTHER REPORT nc(s) (Any other numbers that may be assienea this report) 10. AVAILABILITY/LIMITATION NOTICES THIS DOCUMENT HAS BEEN I'D FCF RELEASE AND SALE; ITS DISTRIRJTION IS UNLIMITED. II. SUPPLEMENTARY NOTES 12. SPONSORING MILITARY ACTIVITY Electronic Systems Division, Air Force Systems Command, United States Air Force, L.G- Hanscom Field 13. ABSTRACT This report outlines the progress in the past quarter in developing a computer program for direct scattering calculations FORM DD " v I JAN UNCLASSIFIED Security Classification
19 UNCLASSIFIED Security Classification KEY WORDS Electromagnetic scattering Digital computation Physical optics Diffraction theory Radar cross section ROLE INSTRUCTIONS 1. ORIGINATING ACTIVITY: Enter the name and address uf the contractor, subcontractor, grantee. Department of Defense activity or other organization (corporate iiui/ii r) issuing the report. 2a. REPORT SEC1 HITY CLASSIFICATION: Enter the ovei ill security classification of the report. Indicate whether "Restricted Data" is included* Marking is to be in ac, y I ance with appropriate security regulations. 26. GROUP: Automatic downgrading is specifier! in DoD Directive and Armed forces Industrial Manual. Enter the group number. Also, when applicable, show thai optional markings have been used for Group 3 and Group 4 as authorized..!. REPORT TITLE: Enter the complete report title in all capita] letters. Titles in all eases should be um lassified. If a meaningful title cannot be selected without classification, show title classification in all capitals in parenthesis immediatel) following the title. I. DESCRIPTIVE NOTES: If appropriate, enter the type of report, e.g., interim, progress, summary, annual, or final. Give the inclusive dates when a specific reporting period is ied. \. M'THOR(S): Enter the namets) of author(s) as shown on or in the report, Enter last name, first name, middle initial. If military, show rank and branch of service The name ol the principal author is an absolute minimum requirement. 6. REPOR r DATE: Enter the date of the icport as day, month, sear, or month, \ear. If more than one dale appears on the report, use date of publication* la. TO I VI. NUMBER OK PAGES: The loial page count should follow normal pagination procedures, i.e., enter t lie number of pages containing information.?r>. NUMBER Of REFERENCES: Enter the total numhci of references < ited in the report. fie CONTRACT OH GRANT Nl'MBER: If appropriate, entei the applicable number of the contract or grant under which the report was written. 86, 8c, & &d. PROJECT NUMBER: rintor the appropriate military department identification, such as project number, subproject number, svstem numbers, task number, etc. 9a. ORIGINATOR'S REPORT NT MBER(S): Enter the official report number bv which the document will be identified and controlled by the originating activity. This number must be unique to this report. 96. OTHER REPORT NLMBER(S): If the report has been assigned anv other report numbers inthfr by thr original* r \ ih<- crifinsc>f/, also enter this number(s). 10. AVAILABILITY LIMITATION NOTICES: Enter any limitations on further dissemination of the report, other than those imposed bv security classification, using standard statements such as: (li "Qualified requesters may obtain copies of this report from DDC." (21 "foreign announi cmert and dissemination of this report bv. DDC is not authorized." (31 *'l. S. (,, v-ernment agencies mav obtain copies of this report dirertlv from DDC. Other qualified DDC users shall request through ( V "I. S. military agenc us may obtain c opies of this repon directlv from DDC. Other qualified useis shall request through (">) "All distribution of this report is controlled. Qualified DDC users shall request through If the report has been furnished to the Office of Technical Serv i, es. Department of Commerce, for sale to the 1 public-, indicate this fact and enter the price, if known. II. SI 1'1'l.f Ml NTARY NOTES: Use for additional explanatory notes. I- SPONSORING Mil ITARY ACTIVITY: Enter the name of the departmental proje t office or laboratory sponsoring Ipayi.'ig /or/the research and development. Include address. 13. ABSTR \C T: Enter an abstract giving a brief and factual summarv of tie- doc ument indicative of the report, even though it mav,i s i appear elsewhere in the IMKIV of the technical report. II additional space is require'], a continuation sheet shall!" attai hed. It is highh desirable that the abstract of classified reports be unclassified. Each paragraph of the abstract shall end with an m du at ion of the mi I it at v sei urn v classification of the information in the paragraph, represented as tts), (Sj, '('.I, or ' L l. 1 here is no limitation on the length of the abstract. However, the suggested length is from l.-)ij to 225 words. 14. KEY WORDS: Kev words are tec linn allv meaningful terms or short phrases that characterize a reporl and mav be used as index entries for i atalogmg the report. Key words must be selected so thai no sei uritv i lasstfication is required. Identifiers, such as equipment model designation, trade name, militarv projei I code name, geographic location, may be used as key words but will he followed hv an indication of technical context. I he assignment of links, rules, and weights is optional. UNCLASSIFIED Security Classification
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