Direct sequence spread spectrum radar

Details Direct sequence spread spectrum radar Direct sequence spread spectrum radar

G - Physics

01

S

G01S 7/03 (2006.01) G01S 13/28 (2006.01) H01Q 21/06 (2006.01) G01S 13/02 (2006.01) G01S 13/04 (2006.01) G01S 13/56 (2006.01) G01S 13/93 (2006.01)

Patent

CA 2270337

A radar sensor comprises a bi-directional biphase modulator 11 arranged to modulate a modulating code, provided by a pseudo-random sequence generator 4, onto an RF signal, and transmit the modulated signal from an antenna 3. Reflected signals are received by the antenna 3 and are correlated by the modulator 11 with the modulated signal. An output signal is given at an output 12 of the correlation indicates that there is movement of an object within a short distance of the antenna 3. The distance-sensitivity characteristics of the sensor can be adjusted by control of the sequence clock 5, which controls the chip rate of the modulating code. The coverage of the radar sensor can be further controlled through the use of a dual patch antenna arrangement having a desired radiation pattern (Figure 4).

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