Wide band pulsed energy system

Claim 2

In a pulse-type energy system, Means for transmitting a linearly frequency-modulated carrier wave pulse having a preselected one of a fixed frequency and chirped amplitude modulation envelope; and Receiving means responsive to received echoes of said transmitted pulse for providing an output corresponding to said modulation envelope.

Claim 3

The device of claim 1 in which said means for transmitting comprises means for generating a linearly frequency modulated carrier having a fixed frequency amplitude modulation.

Claim 4

The device of claim 2 in which said receiving means comprises A non-linear receiver mixer-detector stage; and An intermediate frequency, narrow-bandpass receiver stage responsively coupled to an output of said mixer-detector stage, a bandpass center frequency of said intermediate frequency stage corresponding to the fixed frequency of said amplitude modulation.

Claim 5

The device of claim 1 in which said means for transmitting comprises Means for generating a linearly frequency-modulated carrier wave; A fixed frequency intermediate-frequency source; and An amplitude modulator having a first input responsively coupled to said generating means and further having a modulating input responsively coupled to said intermediate frequency source for providing a modulated output.

Claim 6

The device of claim 4 in which there is further provided a pulse-modulator responsive to said modulated output for pulse-modulation thereof, said pulse modulator and said generating means being coupled to operate synchronously.

Claim 7

The device of claim 4 in which said means for generating a linearly frequency modulated carrier wave comprises A phase-dispersive delay line element having an associated bandwidth; A source of a continuous wave having a stable intermediate frequency lying within the bandwidth of said delay line element; Pulse modulation means for pulsewidth modulating said CW source, the pulsewidth of said modulation means being substantially less then the pulsewidth of said pulsed system and preselected to produce sideband frequencies outside a preselected bandwidth; Bandwidth-limiting means coupled to the output of said modulator for bandwidth-limiting the same to an interval corresponding to a quasi-linear phase dispersive interval of the bandwidth of said delay line, the input of said phase dispersive delay line being coupled to the output of said bandwidth limiting means to impose a linear frequency-modulation envelope upon said bandwidth-limited output; and Frequency multiplier means for multiplying said frequency-modulated output up to a desired transmitting frequency range.

Claim 8

The device of claim 1 in which transmitter comprises means for generating a linearly frequency-modulated carrier having a chirped intermediate frequency amplitude modulation.

Claim 9

The device of claim 7 in which said receiving means comprises A non-linear receiver mixer-detector stage; An intermediate frequency receiver stage having a bandpass corresponding to the bandwidth of said chirped intermediate frequency modulation; and A pulse compression network having a phase versus frequency dispersive property complimentary to the chirped property of said modulation envelope.