发明名称 |
TRUE TIME DELAY PHASE ARRAY RADAR USING ROTARY CLOCKS AND ELECTRONIC DELAY LINES |
摘要 |
Local oscillator circuitry for an antenna array is disclosed. The circuitry includes an array of rotary traveling wave oscillators which are arranged in a pattern over an area and coupled so as to make them coherent. This provides for a set of phase synchronous local oscillators distributed over a large area. The array also includes a plurality of phase shifters each of which is connected to one of the rotary oscillators to provide a phase shifted local oscillator for the array. The phase shifter optionally includes a cycle counter that is configured to count cycles of the rotary oscillator to which it is connected and control circuitry that is then operative to provide a shifted rotary oscillator output based on the count from the cycle counter. A system and method for operating a true-time delay phased array antenna system. The system includes a plurality of antenna element circuits for driving or receiving an rf signal from the elements of the array. Each element circuit has a transmit and a receive path and a local multiphase oscillator, such as a rotary traveling wave oscillator. Each path has an analog delay line for providing a true-time delay for the antenna element. Preferably, the analog delay line is a charge coupled device whose control nodes are connected to phases of the local multiphase oscillator to implement a delay that is an integer number local multiphase oscillator periods. A fractional delay is also included in the path by using a sample and hold circuit connected to a particular phase of the oscillator. By delaying each antenna element by a true time delay, broadband operation of the array is possible.
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申请公布号 |
WO2006133225(A9) |
申请公布日期 |
2007.03.08 |
申请号 |
WO2006US21989 |
申请日期 |
2006.06.06 |
申请人 |
MULTIGIG INC.;WOOD, JOHN;BASIT, HARIS, FOZAN |
发明人 |
WOOD, JOHN;BASIT, HARIS, FOZAN |
分类号 |
G01S7/02 |
主分类号 |
G01S7/02 |
代理机构 |
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