Abstract: A clutter immune radar where the interrogating unit transmits a modulated interrogation signal to a remote unit, which radiates an information-bearing reply signal, in order to enable the interrogating unit to obtain remote unit information and range by the use of three bandpass filter channels where one bandpass filter bandwidth is equal to the sum of the other two bandwidths.

Abstract: A Doppler speed sensor for a ground vehicle wherein errors due to vehicle tilt relative to the ground surface and initial mounting angle error are substantially eliminated by using a first antenna with its radiation pattern directed down and forward and a second antenna with its radiation pattern directed down and rearward, so the principal axes of the radiation patterns are 90.degree. apart. A novel digital technique for processing the signals received from such antennas is also disclosed.

Abstract: Circuit and method for spacing the output signals from a binary rate multiplier by adjusting the rate of the internal clock of the binary rate multiplier to a value approximating (N+1) times f.sub.0 where N represents the multiplier of the input frequency f.sub.0. The output signals thereby produced are substantially evenly spaced at a rate N times f.sub.0.

Abstract: A frequency-modulated continuous-wave collision avoidance radar responsive to both reply signals from cooperating (tagged) targets and to skin reflections from proximate non-cooperating (non-tagged) targets.

Abstract: An apparatus for automatically monitoring the respiration of a subject requiring no physical connection to the subject. The use of such apparatus for automatically triggering an x-ray machine at instants of respiration extrema is also disclosed.

Abstract: A homodyne communication system comprising an interrogating unit and a plurality of responsive remote units wherein a continuous wave RF signal is transmitted from the interrogating unit to illuminate a remote unit. The remote unit causes a return (reply) signal to be transmitted or reflected back to the interrogating unit. A sample of the transmitted (interrogation) signal is mixed with the return signal. Amplitude nulls in the mixer output signal at given relative phase relationships between interrogation and reply signals, are substantially eliminated by selectively shifting the relative phase of the signals. Also disclosed are a homodyne communication system utilizing phase modulation to impress FSK signaling on the reply signal and an automatic vehicle location system utilizing the present invention.

Abstract: An adaptive parameter signal processor for continuous wave radar ranging systems which provides non-quantized measurements of range. Means are provided to select a suitable portion of the difference frequency wave form, excluding any phase reversal. The period of the difference frequency is measured using the selected portion of the waveform and is converted to frequency. The frequency is, in turn, converted to range. The system parameters are automatically adjusted in accordance with the difference frequency waveform.