Monopulse radio receiver compensation apparatus
First Claim
1. In a monopulse radar receiver having at least one sum and difference channel pair for conditioning received target echo signals, each channel comprising at least one attenuator operative in a plurality of attenuation states;
- and a processor for computing from the conditioned echo signals of said at least one sum and difference channel pair a plurality of first signals correspondingly related to said attenuation states of said channel pair, the improvement comprising;
first means for injecting, at times, a pilot signal into both channels of said at least one pair;
second means for setting the at least one attenuator in each of said sum and difference channels of a pair through said plurality of attenuation states during the injection of said pilot signal to render a corresponding plurality of conditioned pilot signals of said channel pair;
third means, including said processor, for computing a respectively corresponding table of second signals from said rendered plurality of conditioned pilot signals, each computed second signal of said table corresponding to an attenuation state of said plurality of attenuation states of said channel pair;
a memory for storing the computed table of second signals into corresponding memory cells; and
fourth means for compensating each computed first signal with a selected second signal from said memory, said selection based on commonly related attenuation states of said first and second signals.
1 Assignment
0 Petitions
Accused Products
Abstract
In a monopulse radar receiver especially having off-boresite processing for a multiple target capability, there is included apparatus for compensating the receiver derived centroid and extent related signals for post hybrid interchannel imbalances in accordance with system parameter states. Generally, there is included in the sum and difference channel pairs of a monopulse radar receiver, attenuators which are operative in a plurality of attenuation states wherein a different error in the centroid and extent related signals may be rendered for each attenuation state. The compensating apparatus included in the receiver derives compensating signals for each of the attenuation states and stores the derived signals for use in compensating the centroid and extent related signals computed under mutually related attentuation conditions. Some monopulse radars additionally include carrier frequency diversity wherein a different error may be imposed on the centroid and extent related signals due to the post hybrid computations of the plurality of carrier frequencies. Consequently, the compensating apparatus, for these cases, further includes a means for deriving compensating signals associated with each of the carrier frequencies of the plurality which may be stored in another memory or memory section for compensating the centroid and extent related signals computed in the receiver in accordance with the carrier frequencies mutually associated therewith.
44 Citations
13 Claims
-
1. In a monopulse radar receiver having at least one sum and difference channel pair for conditioning received target echo signals, each channel comprising at least one attenuator operative in a plurality of attenuation states;
- and a processor for computing from the conditioned echo signals of said at least one sum and difference channel pair a plurality of first signals correspondingly related to said attenuation states of said channel pair, the improvement comprising;
first means for injecting, at times, a pilot signal into both channels of said at least one pair; second means for setting the at least one attenuator in each of said sum and difference channels of a pair through said plurality of attenuation states during the injection of said pilot signal to render a corresponding plurality of conditioned pilot signals of said channel pair; third means, including said processor, for computing a respectively corresponding table of second signals from said rendered plurality of conditioned pilot signals, each computed second signal of said table corresponding to an attenuation state of said plurality of attenuation states of said channel pair; a memory for storing the computed table of second signals into corresponding memory cells; and fourth means for compensating each computed first signal with a selected second signal from said memory, said selection based on commonly related attenuation states of said first and second signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- and a processor for computing from the conditioned echo signals of said at least one sum and difference channel pair a plurality of first signals correspondingly related to said attenuation states of said channel pair, the improvement comprising;
-
9. In a monopulse radar receiver operative to receive target echo signals of a plurality of carrier frequencies and including:
- at least one pair of sum and difference channels for conditioning said received target echo signals; and
a processor for computing from the conditioned echo signals of said at least one sum and difference channel pair a plurality of first signals correspondingly related to said received echo signal carrier frequencies, the improvement comprising;first means for injecting, at times, a pilot carrier frequency signal into both channels of said at least one pair; second means for setting the carrier frequency of said pilot signal during the injection thereof to said plurality of carrier frequency states to render a corresponding plurality of conditioned pilot signals of said channel pair; third means, including said processor, for computing a respectively corresponding table of second signals from said rendered plurality of conditioned pilot signals, each computed second signal of said table corresponding to a carrier frequency state of said received target echo signals; a memory for storing said computed table of second signals into corresponding memory cells; and fourth means for compensating each computed first signal with a selected second signal from said memory, said selection based on commonly related carrier frequency states of said first and second signals. - View Dependent Claims (10)
- at least one pair of sum and difference channels for conditioning said received target echo signals; and
-
11. In a monopulse radar receiver operative to receive target echo signals of a plurality of carrier frequencies and including:
- at least one pair of sum and difference channels for conditioning said received target echo signals, each channel comprising at least one attenuator operative in a plurality of attenuation states; and
a processor for computing from the conditioned echo signals of said at least one sum and difference channel pair a plurality of first signals correspondingly related to said received echo signal carrier frequencies and said attenuation states of said channel pair, the improvement comprising;means for injecting, at times, a pilot carrier frequency signal into both channels of said at least one pair; first means for setting the carrier frequency of said pilot signal during the injection thereof to said plurality of carrier frequency states to render a corresponding first plurality of conditioned pilot signals of said channel pair; second means for setting said at least one attenuator in each of said sum and difference channels of a pair through said plurality of attenuation states during the injection of said pilot signal to render a corresponding second plurality of conditioned pilot signals of said channel pair; means, including said processor, for computing respectively corresponding first and second tables of second signals from said rendered first and second pluralities of conditioned pilot signals, each computed second signal of said first table corresponding to a carrier frequency state of said received target echo signals, each computed second signal of said second table corresponding to an attenuation state of said plurality of attenuation states of said channel pair; a first memory for storing the computed first table of second signals into corresponding memory cells based on the carrier frequency states of said first plurality of conditioned pilot signals; a second memory for storing the computed second table of second signals into corresponding memory cells based on the attenuation states of said second plurality of conditioned pilot signals; means for compensating each computed first signal with a selected second signal from said first and second memories, said selection based on respective commonly related carrier frequency and attenuation states of said first and second signals. - View Dependent Claims (12, 13)
- at least one pair of sum and difference channels for conditioning said received target echo signals, each channel comprising at least one attenuator operative in a plurality of attenuation states; and
Specification