Abstract: A CW radar transmitter is simultaneously frequency modulated with a sinusal wave and phase-modulated with a pseudorandom binary code. Both the frequency of the FM signal and the bits and bit duration in the binary code can be varied to change the resolution and range of the system.

Abstract: CW is beamed continuously by a radar and is sampled continuously in the rr; the radar continuously senses reflections that are returned to the radar. Only if the distance to a reflecting target is changing significantly per unit time is there an output generated; the output is a positive DC voltage if the distance is closing and a negative DC voltage if the distance is opening. An annunciator arrangement responds to the output DC voltage. Reflection frequency energy is mixed with a sampling of the CW to obtain the difference frequency. At the same time, reflection frequency energy is mixed with +90 degrees phase advanced sampling of the CW to obtain the difference frequency. The phase angle between the two difference frequency outputs is increased by +90 degrees and then are channeled to an analog multiplier. The DC output of the analog multiplier operates an annunciator. A much wider range of doppler frequency (viz.

Abstract: Electronic signals are compressed or expanded by writing periodic samples the signal onto one side of a thin magnetic disc at a first rate and then reading the samples off the other side of the disc at a second, and different, rate. In another embodiment of the invention, the samples are written onto a rotating magnetic ring or disc by a plurality of write/erase heads which are selectively gated to the signal source. The samples are then read off the disc by a plurality of read-heads which are selectively gated to the external load.

Abstract: There is disclosed a radar system of the type employing a receiver capable f responding to a signal reflected from a moving target, which signal includes a doppler frequency component indicative of target motion. Included therewith are means for responding to an even harmonic component of said returned signal to provide an indication of the magnitude of the same, the magnitude of said even harmonic component indicative of the nature of said vehicle, as, for example, whether said vehicle is a tracked type (tank) or a wheeled type (automobile).