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Active retrodirective arrays for sps beam pointing. [phase conjugation
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Chernoff, R. |
| Copyright Year | 1980 |
| Description | The basic requirement of the SPS beam pointing system is that it deliver a certain amount of S-band (lambda = 12.5 cm) power to a 9.6 km diameter receiving rectenna on the ground. The power is transmitted from a 1.0 km diameter antenna array on the SPS, which is, for a rectenna at about plus or minus 40 deg. latitude, some 37.5x10 to the 6th power km distant. At the present time ARA's appear to be the best bet to realize this very stringent beam pointing requirement. An active retrodirective array (ARA) transmits a beam towards the apparent source of an illuminating signal called the pilot. The array produces, not merely reflects, RF power. Retrodirectivity is achieved by retransmitting from each element of the array a signal whose phase is the "conjugate" of that received by the element. Phase conjugate circuits and pointing errors in ARA's are described. Results obtained using a 2-element X-band ARA and an 8-element S-band ARA are included. |
| File Size | 861163 |
| Page Count | 23 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19810008024 |
| Archival Resource Key | ark:/13960/t5bc8sc5z |
| Language | English |
| Publisher Date | 1980-12-01 |
| Access Restriction | Open |
| Subject Keyword | Energy Production And Conversion Phased Arrays Pointing Control Systems Rectennas Ultrahigh Frequencies Microwave Transmission Superhigh Frequencies Solar Power Satellites Fail-safe Systems Wave Fronts Phase Conjugation Antenna Radiation Patterns Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
