CONTENTS I. INTRODUCTION ----------------------------------------------------- 1 A. DEFINITION AND PRINCIPLES --------------------------------- 1 B. APPLICATIONS----------------------------------------------- 2 II. ARA DESIGN PROBLEMS AND SOLUTIONS--------------------------------- 5 A. PHASE REFERENCE DISTRIBUTION ------------------------------ 5 B. PHASE CONJUGATION CIRCUITS--------------------------------- 8 C. POINTING ERRORS IN ARAs------------------------------------ 13 III. EXPERIMENTAL RESULTS---------------------------------------------- 21 IV. CONCLUSION-------------------------------------------------------- 24 REFERENCES--------------------------------------------------------------- 26 APPENDIXES A. DOPPLER EFFECTS IN ACTIVE RETRODIRECTIVE ARRAYS------------------- A-l B. ABERRATION ERROR--------------------------------------------------- B-l C. TRANSMISSION LINE MISMATCH ERRORS---------------------------------- C-l TABLE 1. Phase table for Figure 9------------------------------------------ 28 FIGURES 1. Active retrodirective array----------------- ;-------------------- 29 2. Central phasing--------------------------------------------------- 30 3. Tree structure for centrally phased ARA--------------------------- 31 4. Simple phase conjugating circuit---------------------------------- 31 5. Exact PCC: servoed A(p type-------------------------------------- 32 6. Exact PCC: phase-locked-loop type-------------------------------- 32
RkJQdWJsaXNoZXIy MTU5NjU0Mg==