Automatic equalizer for chirp radar system

Claim 2

A Chirp radar system comprising: means for developing a train of input signal pulses; means for frequency dispersing said signal pulses; transmitter antenna means for radiating dispersed signal pulses; receiver antenna means for receiving radiated pulses; means for frequency compressing received pulses; first switching means for, upon actuation, diverting dispersed pulses from said transmitter antenna means to said frequency compressing means; equalizer means; second switching means for, upon actuation, conveying diverted pulses emanating from said frequency compressing means to said equalizer means; means for conveying output signals of said equalizer means to the input of said frequency dispersing means; and means for periodically actuating said first and said second switching means for a predetermined interval of time.

Claim 3

The Chirp radar system as defined in claim 1 wherein said equalizer means comprises; first means for developing a first signal proportional to a delayed replica of an input signal pulse; second means for developing a second signal proportional to a delayed replica of a frequency compressed pulse; and third means for combining algebraically said first and said second signals.

Claim 4

A pulse compression radar system comprising: transmitter means for frequency dispersing applied signal pulses; transmitter antenna means for radiating dispersed signal pulses; receiver means for frequency compressing received pulses; first switching means for, upon actuation, applying directly said dispersed pulses to said receiver frequency compressing means; equalizer means for distorting, in a predetermined manner, applied signal pulses; second switching means for, upon actuation, applying pulses emanating from said receiver frequency compressing means to said equalizer means; means for applying distorted output signals of said equalizer means to said transmitter frequency dispersing means; and means for periodically actuating said first and said second switching means.

Claim 5

A pulse compression radar system comprising: transmitter means for frequency dispersing applied signal pulses; transmitter antenna means for radiating dispersed signal pulses; receiver means for frequency compressing received pulses; first switching means for, upon actuation, applying directly said dispersed pulses to said receiver frequency compressing means; equalizer means for distorting, in a predetermined manner, applied signal pulses; second switching means for, upon actuation, applying pulses emanating from said receiver frequency compressing means to said equalizer means; means for applying distorted output signals of said equalizer means to said transmitter frequency dispersing means; and means for periodically actuating said first and said second switching means.

Claim 6

A Chirp radar system comprising: transmitter means for frequency dispersing applied input signal pulses; transmitter antenna means for radiating dispersed signal pulses; receiver antenna means for receiving radiated pulses; receiver means for frequency compressing received signal pulses; first switching means connecting the output of said transmitter dispersing means, the input of said receiver compressing means and the input of said transmitter antenna means; equalizer means; second switching means connecting the output of said receiver signal compressing means to the input of said equalizer means; means connecting the output of said equalizer means to the input of said transmitter dispersing means; and means for actuating said first and second switching means to enable said dispersed applied signal pulses to circulate, prior to radiation by said transmitter antenna means, in the loop comprising said first switching means, said receiver compressing means, said second switching means, said equalizer means, and said transmitter dispersing means.

Claim 7

A Chirp radar system comprising: transmitter means for frequency dispersing applied input signal pulses; transmitter antenna means for radiating dispersed signal pulses; receiver antenna means for receiving radiated pulses; receiver means for frequency compressing received signal pulses; first switching means connecting the output of said transmitter dispersing means, the input of said receiver compressing means and the input of said transmitter antenna means; equalizer means; second switching means connecting the output of said receiver signal compressing means to the input of said equalizer means; means connecting the output of said equalizer means to the input of said transmitter dispersing means; and means for actuating said first and second switching means to enable said dispersed applied signal pulses to circulate, prior to radiation by said transmitter antenna means, in the loop comprising said first switching means, said receiver compressing means, said second switching means, said equalizer means, and said transmitter dispersing means.

Claim 8

The Chirp radar system as defined in claim 4 wherein said equalizer means comprises: first means responsive to the output of said receiver signal compressing means for developing a first signal proportional to a delayed replica of an input signal pulse; second means responsive to the output of said receiver siGnal compressing means for developing a second signal proportional to a delayed replica of a frequency compressed signal pulse; and third means for combining said first and said second signals to develop a distorted replica of an input signal pulse.

Claim 9

A pulse compression radar system comprising: means for frequency dispersing applied signal pulses; means for transmitting said dispersed signal pulses; means for frequency compressing applied signal pulses; first switching means connecting said dispersing means, said compressing means, and said transmitting means; equalizer means; second switching means connecting the output of said compressing means to the input of said equalizer means; means for applying the output of said equalizer means to said dispersing means; and means for actuating said first and second switching means to enable said dispersed signal pulses to propagate, prior to transmission, through said first switching means, said compressing means, said second switching means, said equalizer means, and said dispersing means.

Claim 10

A pulse compression radar system comprising: means for frequency dispersing applied signal pulses; means for transmitting said dispersed signal pulses; means for frequency compressing applied signal pulses; first switching means connecting said dispersing means, said compressing means, and said transmitting means; equalizer means; second switching means connecting the output of said compressing means to the input of said equalizer means; means for applying the output of said equalizer means to said dispersing means; and means for actuating said first and second switching means to enable said dispersed signal pulses to propagate, prior to transmission, through said first switching means, said compressing means, said second switching means, said equalizer means, and said dispersing means.

Claim 11

In a Chirp radar system having a transmitter including a pulse generator for developing a train of pulse signals, means having an input and output for frequency dispersing said signal pulses, and an antenna having an input and output for radiating said dispersed pulses, and having a receiver including an antenna for receiving radiated pulses, and means having an input and output for frequency compressing received pulses, the improvement comprising: first switching means for, upon actuation, disconnecting the input of said transmitter antenna means from the output of said frequency dispersive means and applying said dispersed pulses to the input of said frequency compressing means; equalizer means; second switching means for, upon actuation, applying pulses emanating from said frequency compressing means to said equalizer means; means for conveying output signals of said equalizer means to the input of said frequency dispersing means; and means for periodically actuating said first and second switching means at a rate equal to the pulse rate of said train of signal pulses and for a predetermined interval of time less than the interval of time between the pulses of said pulse train.

Claim 12

In a Chirp radar system having a transmitter including a pulse generator for developing a train of pulse signals, means having an input and output for frequency dispersing said signal pulses, and an antenna having an input and output for radiating said dispersed pulses, and having a receiver including an antenna for receiving radiated pulses, and means having an input and output for frequency compressing received pulses, the improvement comprising: first switching means for, upon actuation, disconnecting the input of said transmitter antenna means from the output of said frequency dispersive means and applying said dispersed pulses to the input of said frequency compressing means; equalizer means; second switching means for, upon actuation, applying pulses emanating from said frequency compressing means to said equalizer means; means for conveying output signals of said equalizer means to the input of said frequency dispersing means; and means for periodically actuating said first and second switching means at a rate equal to the pulse rate of said train of signal pulses and for a predetermined interval of time less than the interval of time between the pulses of said pulse train.

Claim 13

In a pulse compression radar system having means for frequency dispersing an applied signal pulse, an antenna for radiating said dispersed pulse, an antenna for receiving a radiated pulse, and means for frequency compressing a received pulse, the improvement comprising: first switching means for, upon actuation, preventing radiation of said dispersed pulse and applying said dispersed pulse to said frequency compressing means; equalizer means; second switching means for, upon actuation, applying a pulse from said frequency compressing means to said equalizer means; means for applying the output signal of said equalizer means to said frequency dispersing means; and means for periodically actuating said first and second switching means.

Claim 14

In a pulse compression radar system having means for frequency dispersing an applied signal pulse, an antenna for radiating said dispersed pulse, an antenna for receiving a radiated pulse, and means for frequency compressing a received pulse, the improvement comprising: first switching means for, upon actuation, preventing radiation of said dispersed pulse and applying said dispersed pulse to said frequency compressing means; equalizer means; second switching means for, upon actuation, applying a pulse from said frequency compressing means to said equalizer means; means for applying the output signal of said equalizer means to said frequency dispersing means; and means for periodically actuating said first and second switching means.

Claim 15

The pulse compression radar system as defined in claim 8 wherein said equalizer means comprises means for generating a distorted delayed replica of said applied signal pulse.