Title: Bearing measurement device for a portable attack warning radar

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Claims: What is claimed is:

1. A bearing measurement device for a pseudo-random noise radar system comprising:

at least first and second oppositely facing receiving antennas;

at least first and second oppositely facing transmitting antennas;

said transmitting antennas being located orthogonally with respect to said receiving antennas;

a constant wave source supplying first and second output signals;

first phase modulator having first and second inputs and an output and second phase modulator having first and second inputs and an output;

said first output signal of said constant wave source being coupled to said first input of said first phase modulator and said first input of said second phase modulator, said output of said first phase modulator supplying signals to at least said first transmitting antenna, said output of said second phase modulator supplying signals to at least said second transmitting antenna;

a first homodyne receiver mixer coupled to receive signals from said first receiving antenna and a second homodyne receiver mixer coupled to receive signals from said second receiving antenna, each of said first and second homodyne receiver mixers additionally coupled to receive a reference signal from said second output of said constant wave source so that each mixer supplies an output of coded video signals;

first PN code generator having first and second outputs and a second PN code generator having first and second outputs, said first output of said first PN code generator electrically coupled for supplying coded signals to said second input of said first phase modulator and said first output of said second PN code generator electrically coupled for supplying coded signals to said second input of said second phase modulator;

first range time delay network having an input coupled to receive said second output of said first PN code generator and second range time delay network having an input coupled to receive said second output of said second PN code generator,

first, second, third and fourth code decorrelators; said first and third code decorrelators coupled to receive an output from said second range time delay network and said second and fourth code decorrelators coupled to receive an output from said first range time delay network;

first low noise video amplifier coupled between said first homodyne receiver mixer and said third and fourth code decorrelators for comparing the output of said first homodyne receiver mixer in said third and fourth code decorrelators for providing signal outputs to quadrant four and one signal processors, respectively; and

second low noise video amplifier coupled between said second homodyne receiver mixer and said first and second code decorrelators for comparing the output of said second homodyne receiver mixer in said first and second code decorrelators for providing signal outputs to quadrant three and two signal processors, respectively.

Other info:

Inventors: Magorian, William Ray (China Lake, CA, US)

Application Number: 351727
Filing Date: 1973-04-16
Publication_date: 1976-05-11
Assignee: The United States of America as represented by the Secretary of the Navy (Washington, DC)
Primary Class(es): 342/147 342/189, 342/378
Other Classes:
US Patent Ref:

2929056	Mar, 1960	Page	343/16.
2965898	Dec, 1960	Lewis	343/16.
3300768	Jan, 1967	Bystrom et al.	343/5.
3689750	Sep, 1972	Esser	343/100.

Other Refs:
Primary Examiner: Hubler, Malcolm F.
Assistant Examiner:
Attorney: Sciascia; R. S., Miller; Roy