Abstract: A tropospheric scatter communication system provides diverse angle transmission paths which may be utilized alone or in conjunction with frequency and/or other known diversity system arrangements for improved performance. The diverse angle transmission paths are routed through sum and difference "monopulse" beams displaced in azimuth.

Abstract: Method and apparatus for the detection of a ground moving target using a moving platform MTI radar system are disclosed. Such a moving target is detected by comparing the power level of radar return signals passing in a difference channel of a monopulse receiver with a predetermined power level. In one embodiment, a monopulse antenna of such receiver scans a swath of ground and the power level of radar returns passing in the difference channel having a Doppler frequency equal to the Doppler frequency associated with clutter disposed along the boresight axis of such antenna is compared with a predetermined power level. When the power level of returns in such difference channel at such Doppler frequency is greater than the power level of returns from clutter disposed along the boresight axis (i.e., the predetermined power level), a moving target is indicated.