Raytheon Company

Rockwell International Corporation

Pileih Chen

Kenneth L Moore

Sam H Wong

Chester L Richards, Jr

Douglas K Waineo

Russell Henry Linstrom

Jerry A Algeo

A bistatic radar has a radar transmitter at a first location on a moving platform having a motion and a radar receiver at a second location, remote from the first location. The transmitter illuminates a target along an indirect path with an encoded radar signal. The target reflects the encoded radar signal to the radar receiver. The transmitter concurrently provides the encoded radar signal to the radar receiver along a direct path. The encoded radar signal is radiated at a start time from a central reference point, and contains the first location, the pulse start time, the central reference point and the motion of the moving platform. Bit synchronization codes are also included. The radar receiver receives the encoded radar signal from the radar transmitter along the direct path during a first time interval, and the same encoded radar signal reflected from the target along the indirect path during a second time interval. The radar receiver decodes first information contained in the encoded radar signal from the direct path received during the first time interval to extract direct path information. The radar receiver also decodes second information contained in the encoded radar signal from the indirect path received during the second time interval to extract indirect path information. The radar receiver combines the direct path information and the indirect path information to to generate a target image or perform target detection. Linear Frequency Modulated (LFM) pulse coherency is maintained by extracting from the direct path pulse phase corrections and applying the phase correction to the indirect received LFM pulses.

Operational bistatic radar system synchronization

A bistatic radar system and method. In the illustrative embodiment, a receiver is positioned in a horizontal plane. A transmitter is then positioned in Middle Earth Orbit at a position that is nearly vertical to the plane of the receiver. This configuration provides significant flexibility for the radar system. As such, the radar system may engage in flight patterns, in which the transmitter and receiver have velocity vectors in opposite directions (GMTI mode), the same direction (SAR mode) and variations in between (mixed mode). Lastly, a broad beam is generated from the transmitter and illuminates an area enabling several receivers to simultaneously observe the illuminated area.

Bistatic radar system using transmitters in mid-earth orbit

A modular radar system using both FM/CW and pulse waveforms for automotive collision avoidance applications. The radar system comprises a transmit and a receive antenna for transmitting and receiving, respectively, either one of FM/CW waveform and pulse waveform, a voltage-controlled oscillator (VCO) for generating a pre-set waveform for the transmit antenna, a modulator for modulating the pre-set waveform of the VCO, a switch for allowing the pre-set waveform from the VCO to be transmitted for a predetermined interval so as to generate the pulse waveform, a timing generator for causing the modulator to execute through a pre-set sequence of frequencies for either one of the pulse and FM/CW modes of waveforms with the timing generator controlling the transmission of one of the FM/CW waveform and pulse waveform, a balanced mixer for signal conversion In both FM/CW and pulse modes, an IF/Baseband receiver for amplifying the received FM/CW waveform and for IF-amplifying the received pulse waveform to generate an in-phase and a quadrature baseband output, a coherent oscillator for generating a coherent oscillating signal of a predetermined frequency to the receiver for centering the IF-amplified received pulse waveform at the predetermined frequency during pulse mode, and a frequency control loop for causing the VCO to maintain an offset by a predetermined frequency in the pulse mode between receive and transmit.

Modular radar architecture film (FM/CW or pulse) for automobile

Growing community of inventors

Huntington Beach, CA, United States of America

Pileih Chen