	US 7,570,201 B1
	Radar exciter including phase compensation of the waveform generator
Grant H. Watkins, Dunkirk, Md. (US); and Stephen P. Caldwell, Columbia, Md. (US)
Assigned to Northrop Grumman Corporation, Los Angeles, Calif. (US)
Filed on Nov. 05, 2004, as Appl. No. 10/981,696.
Int. Cl. G01S 7/40 (2006.01)

U.S. Cl. 342—174 [342/100; 342/173]

19 Claims

1. A method of compensating for phase error introduced in the generation and translation of signals of an electrical system, comprising the steps of:

generating one or more waveform generator signals;

generating at least one local oscillator signal from said waveform generator signals;

generating and translating at least one electrical output signal utilizing said local oscillator signal;

detecting all of the phase errors introduced by circuitry used in generating said local oscillator signal and in generating and translating said output signal;

generating a set of phase predistortion values of phase which are in phase opposition to the detected phase errors; and

applying selected phase predistortion values from said set of said predistortion values to the circuitry used in generating said waveform generator signals, said local oscillator signal, and said circuitry used in generating and translating said output signal so as to provide phase compensation for the signals generated thereby.