Non-coherent radar system with means to correct the phase of the return signal

Claim 2

In a radar circuit of the type including a transmitter section having a circuit for generating and transmitting pulsed rf oscillatory signals, and a receiver section having a circuit for detecting echo signals, the combination therewith of: an oscillator means for generating a stable reference signal; means responsive to the phase differences between the pulsed transmitter signals and the stable reference signal for generating an error signal that is proportional to a function of the phase differences therebetween; means for generating a c-w reference signal; and means coupled to receive the echo signal and the c-w reference signal being responsive to the error signals for removing relative phase variations between the received echo signal and c-w reference signal resulting from rf starting phase variations in the transmitted pulses relative to the stable reference signal.

Claim 3

In a radar circuit of the type including a transmitter section having a circuit for generating and tranSmitting pulsed rf oscillatory signals, and a receiver section having a circuit for detectIng echo signals, the combination therewith of: an oscillator means for generating a stable reference signal; means responsive to the phase differences between the pulsed transmitter signals and the stable reference signal for generating an error signal that is proportional to a function of the phase differences therebetween; means coupled to receive the error signal for storing the received error signal during the interpulse period between transmitted pulse signals; means for generating a c-w reference signal; and means coupled to receive the echo signals and the c-w reference signal being responsive to the stored error signals for removing relative phase variations between the received echo signal and c-w reference signal resulting from rf starting phase variationS in the transmitted pulses relative to the stable reference signal.

Claim 4

In a radar circuit of the type including a transmitter section having a circuit for generating and tranSmitting pulsed rf oscillatory signals, and a receiver section having a circuit for detectIng echo signals, the combination therewith of: an oscillator means for generating a stable reference signal; means responsive to the phase differences between the pulsed transmitter signals and the stable reference signal for generating an error signal that is proportional to a function of the phase differences therebetween; means coupled to receive the error signal for storing the received error signal during the interpulse period between transmitted pulse signals; means for generating a c-w reference signal; and means coupled to receive the echo signals and the c-w reference signal being responsive to the stored error signals for removing relative phase variations between the received echo signal and c-w reference signal resulting from rf starting phase variationS in the transmitted pulses relative to the stable reference signal.

Claim 5

In a radar circuit of the type including a transmitter section having a circuit for generating and transmitting pulsed rf oscillatory signals, and a receiver section having a circuit for detecting echo signals, the combination therewith of: a means for generating a clock reference signal; means coupled to receive a portion of the pulsed rf oscillator signals generated at the transmitter section and coupled to receive the clock reference signal for detecting phase differences between the transmitted signal anD the clock reference signal and for generating an error signal that is proportional to a function of the detected phase differences; and means coupled to receive the echo signals and to receive the error signals for removing phase variations in the received echo signal resulting from rf starting phase variations in the transmitted pulses relative to the clock reference signal.

Claim 6

In a radar circuit of the type including a transmitter section having a circuit for generating and transmitting pulsed rf oscillatory signals, and a receiver section having a circuit for detecting echo signals, the combination therewith of: a means for generating a clock reference signal; means coupled to receive a portion of the pulsed rf oscillator signals generated at the transmitter section and coupled to receive the clock reference signal for detecting phase differences between the transmitted signal anD the clock reference signal and for generating an error signal that is proportional to a function of the detected phase differences; and means coupled to receive the echo signals and to receive the error signals for removing phase variations in the received echo signal resulting from rf starting phase variations in the transmitted pulses relative to the clock reference signal.

Claim 7

In a radar circuit of the type including a transmitter section having a circuit for generating and transmitting pulsed rf oscillatory signals, and a receiver section having a circuit for detecting echo signals, the combination therewith of: a means for generating a clock reference signal; means coupled to receive a portion of the pulsed rf oscillatory signals generated at the transmitter section and coupled to receive the clock reference signal for detecting phase differences between the transmitted signal and the clock reference reference and for generating an error signal that is is proportional to a function of the detected phase differences; means coupled to receive coupled to error signal for storing the received error signal during the interpulse period between transmitted pulse signals; and means coupled to receive the echo signals and to receive the error signals for removing phase variations in the received echo signal resulting from rf starting phase variations in the transmitted pulses relative to the clock reference signal.c9

Claim 8

In a radar circuit of the type including a transmitter section having a circuit for generating and transmitting pulsed rf oscillatory signals, and a receiver section having a circuit for detecting echo signals, the combination therewith of: a means for generating a clock reference signal; means coupled to receive a portion of the pulsed rf oscillatory signals generated at the transmitter section and coupled to receive the clock reference signal for detecting phase differences between the transmitted signal and the clock reference reference and for generating an error signal that is is proportional to a function of the detected phase differences; means coupled to receive coupled to error signal for storing the received error signal during the interpulse period between transmitted pulse signals; and means coupled to receive the echo signals and to receive the error signals for removing phase variations in the received echo signal resulting from rf starting phase variations in the transmitted pulses relative to the clock reference signal.c9

Claim 9

In a radar circuit of the type including a transmitter section having a circuit for generating and transmitting pulsed rf oscillatory signals, and a receiver section having a circuit for detecting echo signals, the combination therewith of: a means for generating a clock reference signal; means coupled to receive a portion of the pulsed rf oscillatory signals generated at the transmitter section and coupled to receive the clock reference signal for detecting phase differences between the transmitter signal and the clock reference signal and for generating an error signal that is proportional to a function of the detected ph-se differences; and phase shifter means coupled to receive the echo signals and to receive the error signals for phase shifting the echo signal to remove phase variations between the echo signal and the reference signal resulting from rf starting phase variations in the transmitted pulses.

Claim 10

In a radar circuit of the type including a transmitter section having a circuit for generating and transmitting pulsed rf oscillatory signals, and a receiver section having a circuit for detecting echo signals, the combination therewith of: a means for generating a clock reference signal; means coupled to receive a portion of the pulsed rf oscillatory signals generated at the transmitter section and coupled to receive the clock reference signal for detecting phase differences between the transmitter signal and the clock reference signal and for generating an error signal that is proportional to a function of the detected ph-se differences; and phase shifter means coupled to receive the echo signals and to receive the error signals for phase shifting the echo signal to remove phase variations between the echo signal and the reference signal resulting from rf starting phase variations in the transmitted pulses.

Claim 11

In a radar circuit of the type including a transmitter section having a circuit for generating and transmitting pulsed rf oscillatory signals, and a receiver section having a circuit for detecting echo signals, the combination therewith of: a means for generating a clock reference signal; means coupled to receive a portion of the pulsed rf oscillator signals generated at the transmitter section and coupled to receive the clock reference signal for detecting phase differences between the transmitter signal and the clock reference signal and for generating an error signal that is proportional to a function of the detected phase differences; means coupled to receive the error signal for storing the received error signal during the interpulsed period between transmitted pulse signals; and phase shifter means coupled to receive the echo signals and to receive the error signals for phase shifting the echo signal to remove phase variations between the reference signal and the echo signal resulting from rf starting phase variations in the transmitted pulses.

Claim 12

In a radar circuit of the type including a transmitter section having a circuit for generating and transmitting pulsed rf oscillatory signals, and a receiver section having a circuit for detecting echo signals, the combination therewith of: a means for generating a clock reference signal; means coupled to receive a portion of the pulsed rf oscillator signals generated at the transmitter section and coupled to receive the clock reference signal for detecting phase differences between the transmitter signal and the clock reference signal and for generating an error signal that is proportional to a function of the detected phase differences; means coupled to receive the error signal for storing the received error signal during the interpulsed period between transmitted pulse signals; and phase shifter means coupled to receive the echo signals and to receive the error signals for phase shifting the echo signal to remove phase variations between the reference signal and the echo signal resulting from rf starting phase variations in the transmitted pulses.

Claim 13

A radar circuit comprising: a transmitter means havinG an rf oscillator for transmitting main bang pulse signals; a receiver means for detecting echo signals; a reference oscillator means for generating a clock reference signal; means coupled to receive a portion of the main bang pulse signals generated by said transmitter means and coupled to receive the reference signal for detecting phase differences therebetween and for generating an error signal that is proportional to a function of the phase differences therebetween; means for generating a c-w reference signal; and meanS coupled to receive the c-w reference signal, the echo signal, and the error signal for phase shifting the c-w reference signal and the echo signal relative to one another in proportion to the error signal whereby the echo signal is made coherent relative to the c-w reference signal.

Claim 14

A radar circuit comprising: a transmitter means havinG an rf oscillator for transmitting main bang pulse signals; a receiver means for detecting echo signals; a reference oscillator means for generating a clock reference signal; means coupled to receive a portion of the main bang pulse signals generated by said transmitter means and coupled to receive the reference signal for detecting phase differences therebetween and for generating an error signal that is proportional to a function of the phase differences therebetween; means for generating a c-w reference signal; and meanS coupled to receive the c-w reference signal, the echo signal, and the error signal for phase shifting the c-w reference signal and the echo signal relative to one another in proportion to the error signal whereby the echo signal is made coherent relative to the c-w reference signal.

Claim 15

A radar circuit comprising: a transmitter means having an rf oscillator for transmitting main bang pulse signals; a receiver means for detecting echo signals; a reference oscillator means for generating a stable reference signal; means coupled to receive a portion of the main bang pulse signals generated at said transmitter means and coupled to receive the reference signals for detecting phase differences therebetween and for generating an error signal that is proportional to a function of the detected phase differences; storage means coupled to receive the error signal for storing the received error signal during the interpulse period between main bang pulses; means for generating a c-w reference signal; and means coupled to receive the c-w reference signal, the echo signal, and the error signal for phase shifting the c-w reference signal and the echo signal relative to one another in proportion to the error signal whereby the echo signal is made coherent relative to the c-w reference signal.

Claim 16

A radar circuit comprising: a transmitter means having an rf oscillator for transmitting main bang pulse signals; a receiver means for detecting echo signals; a reference oscillator means for generating a stable reference signal; means coupled to receive a portion of the main bang pulse signals generated at said transmitter means and coupled to receive the reference signals for detecting phase differences therebetween and for generating an error signal that is proportional to a function of the detected phase differences; storage means coupled to receive the error signal for storing the received error signal during the interpulse period between main bang pulses; means for generating a c-w reference signal; and means coupled to receive the c-w reference signal, the echo signal, and the error signal for phase shifting the c-w reference signal and the echo signal relative to one another in proportion to the error signal whereby the echo signal is made coherent relative to the c-w reference signal.

Claim 17

In a radar circuit of the type including a transmitter section having a circuit for generating and transmitting pulsed rf oscillatory signals, a receiver section having a circuit for detecting echo signals, and means for alternately connecting the transmitter section to and the receiver section to an antenna, the combination therewith of: a means for generating two clock reference signals in pulse quadrature with one another; means coupled to receive a portion of the pulsed rf oscillatory signals generated by the transmitter and coupled to receive the in phase quadrature clock reference signal for detecting phase differences between the transmitted signals and the in phase quadrature clock reference signals and for generating two error signals that are proportional to a sine and a cosine function of the detected phase differences therebetween respectively; means coupled to receive the error signal for storing the received error signal during the interpulsed period between transmitted pulse signals; and means coupled to receive the echo signals and to receive the error signals for cancelling phase variations in the received echo signals resulting from rf phase variations in the transmitted pulses relative to the clock reference signals.

Claim 18

In a radar circuit of the type including a transmitter section having a circuit for generating and transmitting pulsed rf oscillatory signals, a receiver section having a circuit for detecting echo signals, and means for alternately connecting the transmitter section to and the receiver section to an antenna, the combination therewith of: a means for generating two clock reference signals in pulse quadrature with one another; means coupled to receive a portion of the pulsed rf oscillatory signals generated by the transmitter and coupled to receive the in phase quadrature clock reference signal for detecting phase differences between the transmitted signals and the in phase quadrature clock reference signals and for generating two error signals that are proportional to a sine and a cosine function of the detected phase differences therebetween respectively; means coupled to receive the error signal for storing the received error signal during the interpulsed period between transmitted pulse signals; and means coupled to receive the echo signals and to receive the error signals for cancelling phase variations in the received echo signals resulting from rf phase variations in the transmitted pulses relative to the clock reference signals.