Abstract: A pulse doppler radar having variable repetition rates, noise pulses resulting from echos received from stationary multiple-time-around objects are removed by subjecting the reflected pulses to a coherent integration modified by means of a simplified vectorial addition of the reflected pulses, using an integration circuit consisting of a plurality of filters.The signal amplitude produced at the output of each filter is individually compared to the mean value of signals produced by all other filters, and a target indication is produced when the mean value is exceeded by the amplitude of a signal from an individual filter.

Abstract: A three-dimensional air space surveillance radar in which the radar receiver is connected to a target tracking means which stores target data and does extrapolation of target data for target trace formations, including a panoramic antenna which illuminates the entire elevation range to be covered and has a reception lobe at the elevation level which can be electronically or mechanically controlled such that a line air space scanning occurs during the course of normally sequence scanning programs. The line-shaped beam of the antenna is briefly interrupted in the invention from the normal reception lobe elevation angle when the tracker determines that a target echo is expected from a different elevation angle than that being scanned.

Abstract: A pulse Doppler radar receiver which continuously monitors successively obtained amplitude values Ao through An with the disrupted amplitude values which deviate by a prescribed value from an interpolation value obtained from adjacent undisturbed amplitude values are determined and are limited to a value obtained from the interpolation value or from the largest or smallest adjacent undisrupted amplitude values and are substituted for the disrupted values. The apparatus includes an interpolation circuit which includes the shift register and limiter with the memory for adjusting the output signal level of the limiter.

Abstract: A circuit arrangement for side lobe suppression in radar wherein the undesired signals which arrive at the radar receiver by way of the side lobes of the antenna are cancelled by using a compensation circuit formed as a loop. Additional circuit means for the formation of a weighting factor for the weighting multiplier are provided in the feedback of the loop between a correlator and a weighting amplifier.When the noise power at the output of the compensating circuit is greater than the noise power that the radar receiver supplies without the compensation circuit, the output will be switched from the compensation circuit to a direct output of the radar receiver. The comparison of the noise power in a comparator then supplies the control signal for the change-over. The change-over can also occur as a function of thermal noises when the amount of the weighting factor exceeds a predetermined value. The weighting factor is monitored by a control circuit.

Abstract: A moving window detector for a radar including adding circuits for automatic detection of moving targets wherein the components of prior art devices are substantially reduced by utilizing a digital integration circuit and a shift register with a number of storage locations and wherein the input echo signals are supplied to the input of the shift register and to the integration circuit and the output of the shift register and the integration circuit are supplied to a subtracting circuit which supplies an output to an adder of the integration circuit so as to substantially reduce the number of components over those of the prior art.