Dual-loop linearizer for FM-CW radar

Details Dual-loop linearizer for FM-CW radar Dual-loop linearizer for FM-CW radar

1999-05-29

2000-09-05

Lobo, Ian J.

Communications: directive radio wave systems and devices (e.g.,

With particular circuit

For frequency modulation

342103, 331 4, G01S 1332, H03L 722

Patent

active

06114987&

ABSTRACT:
A system and method for generating a linear frequency sweep while also improving the phase noise characteristics of a microwave or millimeter wave signal source. The invention uses two phase lock loops. The first phase lock loop uses a linear frequency source to linearize a relatively low frequency VCO (typically around 100 MHz). The first phase lock loop has a bandwidth that is only wide enough to pass the radar modulation waveform with minimal distortion. The first phase lock loop includes a phase detector, narrow band loop filter, low noise HF VCO and a divide by M counter. The second phase lock loop is used to lock a millimeter wave VCO to the lower frequency of the low frequency VCO in the first loop. The low phase noise characteristics of this low frequency VCO are effectively impressed upon a microwave or millimeter wave, low noise high frequency VCO. The low noise high frequency VCO output from the first phase lock loop becomes the reference input for the second phase lock loop, which includes a phase detector, wide band loop filter, millimeter wave (MMW) VCO a local oscillator, mixer, amplifier/filter and a divide by R counter. The MMW VCO output is the FM-CW radar transmitted signal.

REFERENCES:
patent: 4692766 (1987-09-01), Rolfs
patent: 5210539 (1993-05-01), Voyce
patent: 5694132 (1997-12-01), Johnson

Affiliated with

Also associated with

Rating

Dual-loop linearizer for FM-CW radar does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Dual-loop linearizer for FM-CW radar, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dual-loop linearizer for FM-CW radar will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2216741