The signal you are describing is probably a CODAR or WERA radar, but without a bit more information, or maybe a recording, it is impossible to say for sure what you are hearing. Specifically, it might be the long range CODAR in Diablo Canyon, California, that has the designation DCLR. But, since I don't know your location it could be one in Europe also, there are CODAR / WERA there around that freq, especially in the Mediterranean area.
T!