USA As Represented by Secretary of the Navy

Bruce M Heydlauff

Robert B Dillinger

Mervyn C Hoover

Ralph K Beyer

John O Hooper

Dennis G McKinney

John D Channer

Thomas F Reese

An electronic circuit for use in an anti-radiation missile system of the type which uses the electromagnetic transmissions of a target radar for guidance information, detects when the missile has flown into a target null and is no longer receiving energy from one of the main lobes or side lobes of the target radar transmitter. When this condition is detected, the circuit causes an attenuation in the epsilon error guidance signal to momentarily prevent guidance commands based upon the now suspect epsilon error signals from being implemented.

Null filter

A digital video injection system having a digital image source, means for image processing, a scan converter, a seeker-dynamics interface capable of controlling the image system and a digital system controller that is used to simulate real-time flight to an imaging system, such as an imaging weapons system. A method for injecting digital video and a digital video input product also are disclosed.

Digital video injection system (DVIS)

Provided is a system, and general method of use that may be applied to the specific system, that overlays appropriately selected impulse response maps of the response of a weapon system's optical detector over successive detailed supercomputer-generated imaged scenes. Each of the impulse response maps have been pre-calculated and stored in addressable memory in preparation for running a simulation. A preferred embodiment then convolves the response maps with the appropriately selected imaged scene in cooperation with a gyro model and, optionally, a model of the airframe on which the detector is carried. Errors determined from the gyro model are used to calculate and provide an address offset to modify values of the response map's base address for the appropriate map pixels. Scene pixel values that undergo convolution are selected using portions of these modified base address values. A pixel's intensity value from the impulse response map is selected by using these changed base address values prior to convolution as well as the position information from the gyro model. During the convolution, the intensity values assigned to the selected scene pixels' are multiplied by those values from the appropriate impulse response map. This generates resultant values that are summed to produce a final convolved representation, or convolved image, that may be further processed by a digital-to-analog converter to output an analog signal of voltage versus time. This analog signal may be filtered to reduce any associated noise. A preferred embodiment generates a realistic simulation of dynamically changing scenes as viewed by an actual system's optical detector in real time. The simulation may be presented to an actual weapon system's signal processing circuitry for performance evaluation of that circuitry.

Real-time detailed scene convolver

A horizon reference system has a plurality of microwave radiation sensors which are selectively connected by a controller to a superheterodyne receiver. The output signals of the receiver are processed in conjunction with antenna selection data to provide roll angle with reference to the horizon and roll angle rate data about any particular axis of the platform on which the sensors are mounted.

Horizon reference system for a rotating body

A system which processes analog signals from millimeter wave sensing system nto digital words in an organized manner which are then stored into a data memory representing the pixels in the wave images. The pixels are read out at a rate and format to a standard television monitor thus providing a real time display of the sensed image.

Moving scene display for passive radiation-wave imaging system

An apparatus and method removes interfering noise pulses from low-level ro-frequency signals through the application of a video-frequency circuit which causes detection of interfering pulses above an automatically and dynamically established threshold voltage level. Upon detection of an interfering pulse a control signal activates a hold circuit causing the conventional radiometric circuit to be interrupted during the period of the occurrence of the interfering pulse, thereby blocking passage of the pulse, while simultaneously the voltage level of the video-frequency signal is held constant.

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Ridgecrest, CA, United States of America

Bruce M Heydlauff