Doppler tracking optical monopulse

A method, comprising:

• transmitting optical radiation into a field of view containing a plurality of objects from onboard a platform;
• receiving a plurality of reflections of the optical radiation from the objects onboard the platform;
• and
• determining a respective set of angles to each of the objects from the received reflection using non-coherent Fresnel direction finding and the Doppler shift in the reflections.

An apparatus, comprising:

• means for transmitting optical radiation into a field of view containing a plurality of objects from onboard a platform;
• means for receiving a plurality of reflections of the optical radiation from the objects onboard the platform;
• and
• means for determining a respective set of angles to each of the objects from the received reflection using non-coherent Fresnel direction finding and the Doppler shift in the reflections.

An apparatus, comprising:

• a windowing system through which optical radiation may be transmitted and received;
• a source of optical radiation to be transmitted through the windowing system;
• a detector capable of detecting a reflection from a target received through the windowing system;
• and
• means for determining from the received reflection a set of angles to the target using non-Fresnel direction finding and the Doppler shift in the reflection.

The apparatus of 94, wherein each optical channel outputs an unshifted signal and a phase shifted signal and includes:

• means for mixing the split portion and the received reflection;
• means for shifting the mixed split portion and received reflection by 90°;
• and
• means for converting the shifted and unshifted mixed split portion and received reflection from analog form to digital form.

The apparatus of 104, wherein each optical channel outputs an unshifted signal and a phase shifted signal and includes:

• a photomixer capable of mixing the split portion and the received reflection;
• a phase shifting element capable of shifting the mixed split portion and received reflection by 90°;
• and
• an analog-to-digital converter capable of converting the shifted and unshifted mixed split portion and received reflection from analog form to digital form.

The apparatus of 104, wherein each optical channel outputs an unshifted signal and a phase shifted signal and includes:

• a photomixer capable of mixing the split portion and the received reflection;
• a phase shifter, including:
• a second local oscillator capable of generating a second local oscillator signal;
• a phase shifting element for shifting phase of the second local oscillator signal by 90°;
• a first mixer capable of mixing the mixed split portion and received reflection with the unshifted second local oscillator signal;
• and
• a second mixer capable of mixing the mixed split portion and received reflection with the phase shifted second local oscillator signal and
• an analog-to-digital converter capable of converting the shifted and unshifted mixed split portion and received reflection from analog form to digital form.