Name
Abstract | ||
|---|---|---|
A very precise electrical-distance measurement system that is also capable of supplying a phase-synchronous signal to a remote location is required for a new type of radio telescope, the large adaptive reflector (LAR). The system is based on a round-trip phase synchronization method, and is designed to work over a free-space path of length up to 1 km, the focal distance of the telescope. The electrical length of this path is to be measured with an accuracy of 70 μm and a phase-stable signal is to be provided at the remote end as the basis for a local-oscillator signal of stability equivalent to 5° at 22 GHz. Phase synchronization and distance measurement are accomplished with the same microwave ranging circuit. The distance measurement is derived from phase comparison of high-frequency signals, including a novel use of the Chinese Remainder Theorem (CRT) to resolve the unavoidable wavelength ambiguity. The design of the system is described, and limitations imposed by phase-measurement and frequency-setting accuracy are explored. Errors due to atmospheric dispersion are negligible under most circumstances. Accurate phase synchronization has been demonstrated over a free-space path of ~300 m. The complete system has been simulated under noisy conditions, and its ability to meet the specifications demonstrated |
Year | DOI | Venue |
|---|---|---|
2002 | 10.1109/TIM.2002.1017727 | Instrumentation and Measurement, IEEE Transactions |
Keywords | Field | DocType |
distance measurement,feedback,measurement errors,microwave measurement,phase measurement,radiotelescopes,stability,synchronisation,1 km,22 GHz,300 m,70 micron,Chinese Remainder Theorem,airborne platform,electrical-distance measurement system,frequency-setting accuracy,large adaptive reflector,local-oscillator signal,microwave ranging circuit,microwave ranging technique,phase comparison,phase-measurement accuracy,phase-synchronous signal,precise distance measurement,precise ranging,radiotelescope,remote location,remote phase synchronization,round-trip phase synchronization method,square kilometer array,stability | Synchronization,Telescope,System of measurement,Phase synchronization,Optics,Electronic engineering,Focal length,Radio telescope,Ranging,Observational error,Physics | Journal |
Volume | Issue | ISSN |
51 | 3 | 0018-9456 |
Citations | PageRank | References |
2 | 0.77 | 0 |
Authors | ||
3 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Belostotski, L. | 1 | 5 | 2.04 |
| Landecker, T.L. | 2 | 2 | 0.77 |
| Routledge, D. | 3 | 2 | 0.77 |