发明名称 |
DDS SPUR MITIGATION IN A HIGH PERFORMANCE RADAR EXCITER |
摘要 |
A technique is described for providing a pulsed radar exciter signal, in a radar exciter including a direct digital synthesizer (DDS) (60). The DDS is reset pulse-to-pulse to provide a pulsed DDS signal having pulse-to-pulse phase discontinuities due to the resetting of the DDS. The phase of the pulsed DDS signal can be shifted pulse-to-pulse by a phase shift that is held constant over a pulse to correct the pulse-to-pulse phasing of the DDS signal. A discrete phase modulator (70) can provide the phase shift. The phase of the pulsed DDS signal can be shifted pulse-to-pulse by an additional phase shift which is a linear phase sequence from pulse-to-pulse, or by an additional phase shift which is a quadratic phase sequence from pulse-to-pulse to produce a ranging wafeform. |
申请公布号 |
WO0218970(A2) |
申请公布日期 |
2002.03.07 |
申请号 |
WO2001US24853 |
申请日期 |
2001.08.08 |
申请人 |
RAYTHEON COMPANY |
发明人 |
NUSSBAUM, HOWARD, S.;POSEY, WILLIAM, P. |
分类号 |
G01S7/03;G01S7/282;G01S13/26 |
主分类号 |
G01S7/03 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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