Abstract: Apparatus (10) for acquiring and tracking a missile (M), and guiding it to a target (T). Beacons (18, 19) are carried on the missile to provide an indication of its location in a field of view. One beacon (18) is a xenon beacon which emits energy in a short wave-length portion of the light spectrum. The other beacon (19) is a thermal source which emits infrared radiation in a longer wave-length portion of the spectrum. A sight unit (20) includes both a xenon beacon detector and a forward looking infrared receiver (FLIR). The FLIR provides two independent channels (A, B) of video. An electrical signal developed within the sight unit is separately processed on both of the channels. One channel is used to develop a video display for an operator for target acquisition and tracking. The other channel is used for missile tracking and clutter and countermeasure (CM) rejection.

Abstract: A waveform generator (12') is responsive to a reference clock signal input for producing an output waveform which is a linear FM waveform. A reference clock signal is supplied to the generator which performs a double integration to obtain the phase of the output signal. The phase resulting from the double integration is used to obtain the sine of the phase using a lookup table. The sine of the phase is input to digital-to-analogue (D/A) converter, and the output from the D/A converter is filtered using a bandwidth matched to the bandwidth of the transmitted signal. The generator is useful in radar systems for area mapping and target identification.

Abstract: A method of providing motion compensation (i.e. phase, doppler frequency, and range closure correction) for wide band synthetic aperture radar (SAR) or classification/identification radar modes is disclosed. An improved radar system employing the method is also disclosed. The method involves dividing the motion compensation into both a focusing function and a range closure function. Either or both these functions is achieved by modifying the transmitted signal. For stretch waveform processing systems, the method involves generating both the transmitted and reference signals. The radar system includes a waveform generator capable of implementing the various motion compensation techinques when the transmitted waveform is a linear FM waveform.