Continuous-wave radar responder having two-position switches
First Claim
1. A continuous wave radar responder for receiving a frequency and amplitude-modulated carrier signal, said responder comprising:
- a. aerial means for receiving and retransmitting the carrier signal;
b. means for effecting sampling of the received carrier signal at a frequency which is at least double the amplitude-modulation frequency;
c. an amplifier for amplifying the samples of the received carrier signal;
d. a delay line for delaying the samples of the received carrier signal;
e. a first multi-position switch connected to the amplifier input; and
f. a second multi-position switch connected to the amplifier output;
said means for effecting sampling of the received carrier signal controlling the operation of said first and second switches such that they sequentially interconnect the aerial means, the amplifier, and the delay line to effect passage of each sample of the received signal through the amplifier, then through the delay line, and then through the amplifier again before retransmission.
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Accused Products
Abstract
The invention relates to C-W radar responders, having a carrier of some gigahertz whose amplitude is modulated between some dozens and some hundreds of kilohertz. Such a responder comprises means for sampling the signal it receives in such a manner that the sampling theorem is satisfied with respect to the amplitude-modulation frequency. The responder comprises at least an aerial, a radio-frequency amplifier, a delay line, a clock generator, an input, an output and two switches connected to the input and to the output, respectively, of the amplifier. The operating sequence of the switches, controlled by the clock generator, is such that each sample of the received signal passes through the amplifier more than once before it is re-transmitted.
18 Citations
8 Claims
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1. A continuous wave radar responder for receiving a frequency and amplitude-modulated carrier signal, said responder comprising:
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a. aerial means for receiving and retransmitting the carrier signal; b. means for effecting sampling of the received carrier signal at a frequency which is at least double the amplitude-modulation frequency; c. an amplifier for amplifying the samples of the received carrier signal; d. a delay line for delaying the samples of the received carrier signal; e. a first multi-position switch connected to the amplifier input; and f. a second multi-position switch connected to the amplifier output; said means for effecting sampling of the received carrier signal controlling the operation of said first and second switches such that they sequentially interconnect the aerial means, the amplifier, and the delay line to effect passage of each sample of the received signal through the amplifier, then through the delay line, and then through the amplifier again before retransmission. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification