Moving target indicator system and apparatus

Claim 2

A moving target indicator system comprising a signal source for generating an output signal, codE generator means for generating a primary code train and at least one secondary code train delayed relative to said primary code train, modulator means responsive to said primary code train to modulate said output signal to produce a coded output signal, antenna means for transmitting in a directional beam said coded output signal and for receiving coded signals reflected by targets remote from said antenna means, said antenna means including fixed RF feed means and reflector means mounted for movement relative to said RF feed means, comparison means for comparing said reflected coded signals and said secondary code train and producing a unipolar signal train with doppler modulation information as a function of relative movement between said antenna means and a target producing said reflected coded signals in response to a matching relation between said reflected coded signals and said secondary code train, doppler modulation detector means responsive to said unipolar train for producing an alarm signal, and indicator means responsive to said alarm signal for producing an indication of the location of a target relative to said antenna means.

Claim 3

The system as claimed in claim 1 wherein said code generator means generates said primary code train and a plurality of secondary code trains and further including selector means for applying a selected one of said secondary code trains to said comparison means.

Claim 4

The system as claimed in claim 2 and further including means for moving said antenna means in a scanning pattern, bearing sensor means for producing signals indicative of the orientation of said antenna means and means responsive to said antenna orientation signals for controlling said selector means.

Claim 5

The system as claimed in claim 3 wherein said antenna moving means causes said radiated beam to rotate about an axis, said bearing sensor means produces a series of antenna orientation signals as said radiated beam is rotated about said axis, said antenna orientation signal responsive means includes a counter, and logic responsive to said counter for controlling said selector means.

Claim 6

The system as claimed in claim 4 and further including matrix decoder means responsive to said counter for controlling the application of said alarm signals to said indicator means.

Claim 7

The system as claimed in claim 2 and further including synchronizing logic responsive to said code generator means for operating said selector means at a predetermined setting of said code generator means.

Claim 8

The system as claimed in claim 2 wherein said code generator means includes a multistage shift register and said code train deriving means is coupled to a plurality of different stages of said shift register as a function of the relation between said primary and secondary code trains.

Claim 9

A moving target indicator system comprising a signal source for generating an output signal, code generator means for generating a primary code train and at least one secondary code train delayed relative to said primary code train, DC/DC power conversion means including frequency sensitive means, means for applying one of said code trains to said frequency sensitive means to phase lock the conversion frequency of said power conversion means to the PRF of said code generator means, modulator means responsive to said primary code train to modulate said output signal to produce a coded output signal, antenna means for transmitting in a directional beam said coded output signal and for receiving coded signals reflected by targets remote from said antenna means, comparison means for compariing said reflected coded signals and said secondary code train and producing a unipolar signal train with doppler modulation information as a function of relative movement between said antenna means and a target producing said reflected coded signals in response to a matching relation between said reflected coded signals and said secondary code train, doppLer modulation detector means responsive to said unipolar signal train for producing an alarm signal, and indicator means responsive to said alarm signal for producing an indication of the location of a target relative to said antenna means.

Claim 10

A moving target indicator system comprising a signal source for generating an output signal, code generator means for generating a primary code train and at least one secondary code train delayed relative to said primary code train, DC/DC power conversion means including frequency sensitive means, means for applying one of said code trains to said frequency sensitive means to phase lock the conversion frequency of said power conversion means to the PRF of said code generator means, modulator means responsive to said primary code train to modulate said output signal to produce a coded output signal, antenna means for transmitting in a directional beam said coded output signal and for receiving coded signals reflected by targets remote from said antenna means, comparison means for compariing said reflected coded signals and said secondary code train and producing a unipolar signal train with doppler modulation information as a function of relative movement between said antenna means and a target producing said reflected coded signals in response to a matching relation between said reflected coded signals and said secondary code train, doppLer modulation detector means responsive to said unipolar signal train for producing an alarm signal, and indicator means responsive to said alarm signal for producing an indication of the location of a target relative to said antenna means.

Claim 11

The system as claimed in claim 8 wherein said code generator means includes multistage shift register means, said primary code train and a plurality of secondary code trains being derived from different stages of said shift reigster means and further including selector means for applying a selected one of said secondary code trains to said comparison means.

Claim 12

The system as claimed in claim 9 and further including synchronizing logic responsive to said multistage shift register for operating said selector means at a predetermined setting of said multistage shift register.

Claim 13

The system as claimed in claim 10 and further including means for moving said antenna means in a scanning pattern, bearing sensor means for producing signals indicative of the orientation of said antenna means and means responsive to said antenna orientation signals for controlling said selector means.

Claim 14

The system as claimed in claim 11 wherein said antenna moving means causes said radiated beam to rotate about an axis said bearing sensor means produces a series of antenna orientation signals as said radiated beam is rotated about said axis, said antenna orientation signal responsive means includes a counter, and logic responsive to said counter for controlling said selector means.

Claim 15

The system as claimed in claim 12 and further including matrix decoder means responsive to said counter for controlling the application of said alarm signals to said indicator means.

Claim 16

The system as claimed in claim 1 wherein said RF feed means is an elongated member defining an axis and said reflector means is mounted for rotation about said axis.

Claim 17

The system as claimed in claim 14 wherein said reflector means includes a body member of light weight low dielectric material and RF selector material disposed on a surface of said body member.

Claim 18

The system as claimed in claim 15 and further including supplemental RF reflector means in said body member.

Claim 19

The system as claimed in claim 14 wherein said RF feed means includes a plurality of said radiating elements spaced along the length of said elongated member.

Claim 20

The system as claimed in claim 17 wherein said RF feed member is a coaxial transmission line having a central inner conductor, a tubular outer conductor and dielectric material disposed between said inner and outer conductors, and each said radiating element is defined by a circumferential slot in said outer conductor.

Claim 21

The system as claimed in claim 14 and further including bearing sensor means including indicia means carrying a series of equally spaced indicia and sensor means responsive to said indicia for providing an indication of the orientation of said reflector means one of said indicia means and said sensor means being mounted for movement with said reflector means and the other fixed to said RF feed means.

Claim 22

The system as claimed in claim 19 wherein said code generator means generates said primary code train and a plurality of secondary code trains and further including means for moving said reflector means in a scanning pattern, said bearing sensor means producing signals indicative of the orientation of said reflector means, selector means for applying a selected one of said secondary code trains to said comparison means, and means responsive to said reflector orientation signals for controlling said selector means.

Claim 23

The system as claimed in claim 20 wherein said reflector means causes said radiated beam to rotate about the axis of said RF feed means, said bearing sensor means produces a series of reflector orientation signals as said radiated beam is rotated about said axis, and said reflector orientation signal responsive means includes a counter, and logic responsive to said counter For controlling said selector means.

Claim 24

The system as claimed in claim 21 and further including matrix decoder means responsive to said counter for controlling the application of said alarm signals to said indicator means.

Claim 25

The system as claimed in claim 22 and further including synchronizing logic responsive to said code generator means for operating said selector means at a predetermined setting of said code generator means.

Claim 26

The system as claimed in claim 23 and further including DC/DC power conversion means including frequency sensitive means and means for applying one of said code trains to said frequency sensitive means to phase lock the conversion frequency of said power conversion means to the PRF of said code generator means.

Claim 27

The system as claimed in claim 24 wherein said code generator means includes multistage shift register means, said primary code train and a plurality of secondary code trains being derived from different stages of said shift register means.