Automatic frequency control for radar receiver

Details Automatic frequency control for radar receiver Automatic frequency control for radar receiver

G - Physics

01

S

331/33, 343/62,

G01S 7/28 (2006.01) G01S 7/285 (2006.01) H03J 7/04 (2006.01)

Patent

CA 1225138

Abstract A digital automatic frequency control for a pulse-type radar receiver having a voltage controlled local oscil- lator. A first digital number is generated and converted to a first analog voltage for coarse control of the local oscillator frequency. The first digital number is varied during the time output from the radar transmitter is pres- ent at the receiver mixer. The first digital number is varied causing sweep of the local oscillator frequency. When the difference frequency output from the mixer is at a value to cause output from the receiver intermediate frequency amplifier of a predetermined level, variation of the first digital number is halted, providing a coarsely tuned local oscillator frequency. A second digital number is then generated, converted to a second analog voltage which is combined with the first analog voltage. The second digital number is varied to cause the local oscil- lator frequency to be sidestepped above and below the coarsely tuned frequency. Samples of the receiver output are separately accumulated for sidesteps above and below the coarsely tuned frequency. The difference between the separated accumulated outputs is used to generate a third digital number which is converted to a third analog volt- age. The third analog voltage is combined with the first analog voltage to fine tune the local oscillator frequency.

474012

Affiliated with

Also associated with

Rating

Automatic frequency control for radar receiver does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Automatic frequency control for radar receiver, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic frequency control for radar receiver will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1290544