A radar apparatus displays echo signals in a manner that desired echo signals can be easily distinguished from unwanted echo signals such as sea clutter and the like and eliminated, when any one of display modes is selected. The radar apparatus includes a receiving unit for receiving echo signals, a buffer memory for storing echo signals resulting from one search signal and produced by the receiving unit, a first memory for storing echo signals coming from a wide range of directions in memory el...

A method and apparatus for determining an altitude for a radar fuze. The method includes the steps of receiving a return signal and transmitting a transmitted signal. The return signal and the transmitted signal are mixed and a mixed signal representing an altitude is responsively generated therefrom. The mixed signal is amplified to generate an amplified signal. The amplified signal is filtered to generate a filtered signal which is envelope detected to provide a detected signal responsive to t...

A marine radar has a screen on which is displayed a radar image and several representations of the different control functions of the radar such as range, gain and sea clutter setting. The radar also has a key pad with three keys and a tracker ball that is connected to the radar control unit. The control unit generates a marker on the screen that is movable by the tracker ball. To change one of the control functions, the tracker ball is displaced until the marker moves into the region of the rep...

The invention provides a man-portable, non-ground-contacting, ultra-wide band impulse radar system (1), the system having separate transmit and receive antennae located in a common non-metallic housing (2) mounted at one end of a lightweight boom (3), them being a data-processing computer and battery housing (4) mounted at the other end of the boom (3) end acting as a counterweight to the antennae system (2), and the there being a data display and control unit (6) mounted generally centrally of ...

Radar signature simulator for use in electronic warfare and training intercept operators. Recorded video portions of radar signature as they appear at the point of intercept on a video tape recorder are played back to produce video signals. These signals are used to amplitude modululate an RF signal of the desired frequency. The modulated signal is amplified in a linear amplifier and fed to a broadband tansmitting antenna.

A radar receiver and, more particularly, a radar receiver of the type which is utilized in connection with a frequency-modulated, continuous-signal radar apparatus. The radar receiver, in the receiving channel thereof, is provided with a high-pass filter of the second order which is only operated in the linear characteristic curves range, thus acting as an R.sup.4 -filter and which is connected in front of a demodulating rectifier, or in essence, an analog-digital quantitizer.

A radar system comprises a radar carrier frequency oscillator for producing a radar carrier signal, a receiver including a mixer for producing Doppler signals, a Doppler filter bank and an alarm circuit, including a series of Doppler bins, having an alarm threshold level. The radar system is provided with a frequency modulator for modulating the radar carrier signal and any interference signal received by the receiver whereby the bandwidth of the frequency modulated interference signal exceeds t...

An antenna section radiates a pulse beam and receives its reflected wave, and a signal processing section observes a rain or cloud occurring region within a covered area based on a signal intensity of the reflected wave. In this case, to obtain wind direction and velocity information for the rain or cloud occurring region, the signal processing section observes Rayleigh scattering-induced Doppler echo components in that region to calculate the wind direction and velocity from a result of the obs...

A compact radar detector incorporates an elongated dielectric antenna, one end of which is coupled to an aligned cylindrical resonant waveguide. The dielectric antenna has cylindrical and tapered portions which cooperate with the waveguide to provide a narrower beam width, high gain and more directivity in comparison to prior art radar detectors. The antenna projects forwardly from a relatively thin rectangular housing which encloses the waveguide and other components in a manner providing for c...

The invention provides a radar system in which the average power output of the radar transmitter is increased to a value above its rated mean power output during a dwell time during which the radar beam traverses a target of interest. The increase in the average power output of the transmitter typically is of the order of 10 dB and is arranged to be effective for a period of from one to five dwell times, but no longer, with a period of recovery, of at least a substantial fraction of the period o...