Vehicle collision radar with randomized fsk waveform

Details Vehicle collision radar with randomized fsk waveform Vehicle collision radar with randomized fsk waveform

G - Physics

01

S

G01S 13/93 (2006.01) G01S 7/36 (2006.01) G01S 13/34 (2006.01) G01S 13/42 (2006.01) G01S 13/536 (2006.01) B60R 21/01 (2006.01) G01S 7/35 (2006.01) G01S 13/02 (2006.01)

Patent

CA 2275528

An automotive radar incorporates a repetitive randomized equivalent LFM sequence of frequencies for improved immunity to jamming from other automotive radars. Each frequency in the sequence is of sufficient duration to travel round trip over the detection range of the radar. The Doppler shift in the received signal is estimated by performing a spectral analysis on similar frequency components of the received signal, and is then removed from the entire received signal. The received signal (202) is then reordered (204) so as to form an equivalent LFM received signal, and is compared with a similarly reordered image of the transmitted signal so as to estimate the range to the target (210). The randomization sequence, initial start frequency, or initial time of the repetivie sequence are varied to minimize the effects of jamming by other radars, and this variation can be directionally dependent.

L'invention porte sur un radar de véhicule comprenant une séquence LFM de fréquences linéaire, équivalente, randomisée, répétitive conférant une meilleure immunité contre le brouillage provenant d'autres radars de véhicules. Chaque fréquence de la séquence est d'une durée suffisante pour effectuer un aller-retour sur la distance de détection du radar. On évalue le décalage Doppler du signal reçu en effectuant une analyse spectrale sur des composants de fréquences similaires du signal reçu, puis on élimine ce décalage de la totalité du signal reçu. Ce signal reçu (202) est ensuite réordonné (204) de façon à générer un signal reçu LFM équivalent, et il est comparé à une image du signal transmis réordonnée de la même façon pour pouvoir évaluer la distance par rapport à l'objectif (210). On fait varier la séquence de randomisation, la fréquence de départ initiale ou le temps de départ initial en minimisant les effets de brouillage provoqués par d'autres radars, cette variation pouvant se faire en fonction de la direction.

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