GENERATION OF WIDEBAND LINEAR FREQUENCY MODULATION SIGNALS
Assignee
Hughes Aircraft
Filed as: HUGHES AIRCRAFT COMPANY, A DE CORP.
Filed
Apr 22, 1988
Granted
Dec 20, 1994
Location
CULVER CITY CA US
Abstract
A low-frequency low bandwidth Linear Frequency Modulation (LFM) waveform, nominally a 1 MHz to 10 Mz swept frequency analog sinusoid or digital square wave, is produced by direct digital synthesis. This waveform is upconverted in frequency and expanded in bandwidth, nominally to microwave frequencies with bandwidths of nominally 160-360 MHz, in a multiplying offset phase locked loop. The phase locked loop also linearly frequency modulates a X-band carrier with the microwave frequency LFM waveform to produce an output signal suitable for Synthetic Aperture Radar. The phase locked loop induces low phase error, and may be closed around the radar transmitter to remove phase errors induced by that unit.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Dec 12, 1988
Rescinded
May 23, 1994
Duration
5 years, 5 months
Inventor
- 1JAMES L. BLANTON
Record Details
- Patent number
- US 5374903
- Application
- 07185015
- Aerospace match
- Yes
- Dataset source
- 35 USC §181 SO records
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