Patent ID: 6933878
Filing Date: 2005-08-23
Classification: G01S

Abstract:
1. A Doppler radar, comprising: a plurality of individual sources of microwave energy designed to operate over different frequency bands each of one octave or less spaced so that in combination said sources are capable of operating over a frequency band or more than one octave; a pulse generator means connected to the individual said microwave sources for driving the individual said microwave sources to produce simultaneous pulses at different frequencies within their individual said frequency bands; a first plurality of individual channels leading from the respective said sources and having relatively non-linear characteristics; a common channel having relatively linear characteristics; an antenna means connected to one end of said common channel for transmitting a signal fed thereto via said common channel in a single beam direction and for receiving the transmitted signal after reflection from a remote target and feeding the received signal to said common channel; a plurality of individual receivers designed to operate in the respective said different frequency bands; a second plurality of separate channels for carrying signal components in the respective said different frequency bands and connected to the respective inputs of said plurality of receivers; means, connected to the other end of said common channel, for combining the outputs from the individual channels of said first plurality of separate channels onto said common channel and for separating a received signal in said common channel into said different frequency bands and feeding same to the respective individual channels of said second plurality of channels; and, velocity deduction means connected to receive an output from each receiver and to deduce therefrom a Doppler frequency shift of that component of the received signal in the appropriate frequency band.