Patent ID: 6069580
Filing Date: 2000-05-30
Classification: G01S,H03D,H03J,H04B

Abstract:
A broad band, multi-band radar detector having at least two down conversion stages to down convert incoming high radio frequency radar signals in a plurality of frequency bands over a broad range of frequencies to lower frequency signals which indicate the presence of an incoming signal in any frequency band being tested for by said radar detector, wherein said radar detector includes a receiving antenna, a microprocessor controller, a swept frequency first local oscillator, a synthesized frequency second local oscillator, a first mixer, and a second mixer:said first mixer having a signal input port into which signals from said receiving antenna are applied, a local oscillator input port into which signals from said first local oscillator are applied, and an output port from which signals at a first intermediate frequency are derived;said first local oscillator being under the control of said microprocessor;said second mixer having a signal input port into which signals at said first intermediate frequency are applied, a local oscillator input port into which signals from said second local oscillator are applied, and an output port from which signals at a second intermediate frequency are derived for further signal handling;wherein said synthesized frequency second local oscillator is governed by a phase lock loop feedback circuit under the control of said microprocessor, and the output frequency f.sub.2lo of said second local oscillator is varied under the control of said microprocessor by an adjustment amount of plus or minus f.sub.adj ;whereby the tuning range of said radar detector is increased in each frequency band of interest by an amount equal to .+-.f.sub.adj.