초록 ▼

A radar system has a phased-array antenna and plural local oscillators for controlling local transmit/receive units. The local oscillators are slaved to a master oscillator. The analog clock signal paths are subject to relative changes in electrical length. The electrical lengths of the signal paths

A radar system has a phased-array antenna and plural local oscillators for controlling local transmit/receive units. The local oscillators are slaved to a master oscillator. The analog clock signal paths are subject to relative changes in electrical length. The electrical lengths of the signal paths are measured by phase-detecting forward- and reverse-direction clock signal flows. The phase-detected information for each signal path is a measure of the time delay. The radar command processor receives the measure of time delay and corrects the radar operation in response thereto.

대표청구항 ▼

What is claimed is: 1. A method for synchronizing first and second clocks, said method comprising the steps of:transmitting a first clock signal by way of a transmission line from said first clock to said second clock, wherein at least a portion of said first clock signal is reflected from said seco

What is claimed is: 1. A method for synchronizing first and second clocks, said method comprising the steps of:transmitting a first clock signal by way of a transmission line from said first clock to said second clock, wherein at least a portion of said first clock signal is reflected from said second clock and propagates toward said first clock as a reflected first clock signal;at a location near said first clock, sampling said first clock signal and said reflected first clock signal in said transmission line to produce a sampled first clock signal and a sampled reflected first clock signal; anddetermining, from a relative timing of said sampled first clock signal and said sampled reflected first clock signal, a propagation time of said transmission line.