Pulse coherent transponder with precision frequency offset

Details Pulse coherent transponder with precision frequency offset Pulse coherent transponder with precision frequency offset

1975-01-06

1977-02-01

Hubler, Malcolm F.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 958

Patent

active

040064778

ABSTRACT:
A radar reply transponder for use with existing radar tracking systems wherein a reply pulse is generated and trasmitted in response to an associated interrogation pulse. The reply pulse is delayed in time and offset in frequency by a precise amount with respect to the interrogation pulse, but it is nevertheless phase coherent therewith so as to preserve the required Doppler frequency information and thereby permit accurate velocity measurements. Phase coherence is effectively maintained by utilizing a single continuously operating local oscillator for down-converting the received interrogation pulse to an intermediate frequency as well as up-converting the signal information to provide the delayed and frequency offset reply pulse. The precision frequency offset is obtained by switching in an additional reactance element in the oscillator-determining circuitry during the time up-converting is being effected. The radar transponder may thus be used in a high-vibration environment with no substantial introduction of error in velocity measurements caused by using two independent oscillators to formulate the frequency offset.

REFERENCES:
patent: 2671850 (1954-03-01), Marcou
patent: 3079557 (1963-02-01), Crabtree
patent: 3384893 (1968-05-01), Prestwood
patent: 3636453 (1972-01-01), George
patent: 3683279 (1972-08-01), Weinberg et al.
patent: 3685050 (1972-08-01), Cartwright
patent: 3896441 (1975-07-01), Richmond

Affiliated with

Also associated with

Rating

Pulse coherent transponder with precision frequency offset does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Pulse coherent transponder with precision frequency offset, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pulse coherent transponder with precision frequency offset will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1094160