US 4,070,769 A · Digital radar target generator

Abstract

Apparatus is disclosed which generates simulated radar target signal returns that are input to radar equipment to test the equipment and to train radar operators. A small number of individual simulated radar target signal scenarios are provided which are easily selectively combined to provide a large plurality of training scenarios on a radar display. The equipment provides such features as multiple aircraft display, terrain masking, variable target size, range gate splitting, identification friend or foe, and ambiguity checking. The radar signal generator apparatus utilizes a stored binary data word representing each simulated radar target trace and each data word contains bit fields for each of the above target features as well as the simulated target position on the radar display indicator. A single counter driven by the radar system clock is used to generate binary numbers that are compared to the target position information of each stored target data word. Upon a comparison match the radar display writing beam is intensified to trace the simulated radar target with the trace width specified by the appropriate bit field of the associated data word.

Claims11

Dependent claims

A radar target generator for displaying targets on the display of a radar system having a clock the counts of which indicate a plurality of points on said display, said generator comprising

storage means storing individual target scenarios, each scenario including a plurality of target display numbers each of which indicates one of said plurality of points,
first means for selecting one or more individual target scenarios and interleaving the display numbers of the selected ones of said individual target scenarios when more than one scenario is selected to produce a composite target scenario,
read out means for selecting sequential ones of said display numbers in said composite target scenario, and
a comparator individually comparing said sequentially selected display numbers with the counts of said clock and providing a signal causing a target trace on said display whenever there is a match between said clock count and said display numbers.

1 more element

A radar target generator for displaying targets on the display of a radar system having a clock the counts of which can indicate a plurality of points on said display and having a shaft encoder providing a first signal indicating the azimuth position of the antenna of the radar system, said generator comprising

first means for storing a target scenario for at least one target, each said scenario including a plurality of target display numbers each of which indicate one of said plurality of points on said display,
means for reading sequential ones of said display numbers of said stored target scenario out of said first storage means,
a first comparator individually comparing each of said sequentially selected display numbers with the counts of said clock and providing a second signal when there is a match between said clock count and one of said display numbers,
second storage means used to store the display number input to said first comparator upon there being said second signal output from said comparator,
a second comparator used to compare each of the display numbers stored in said second storage means with the first signal output from said shaft encoder and providing a third signal upon there being a match between said first signal and each of said display numbers in said second storage means,
strobe means being activated by each of said second signals for generating a pulse train in response to each of said second signals, the period between pulses in each of said pulse trains being equal to the time of one radial trace on said display, the one of said pulses in a pulse train following a third signal causing a target trace on said display.

3 more elements

Dependencies are inferred from the claim text.

Digital radar target generator

Life of this patent

Digital radar target generator

Life of this patent

Abstract

Claims11