PCT No. PCT/SE80/00122 Sec. 371 Date Dec. 25, 1980 Sec. 102(e) Date Dec. 23, 1980 PCT Filed Apr. 23, 1980 PCT Pub. No. WO80/02325 PCT Pub. Date Oct. 30, 1980.The invention relates to a method for a tracking radar which transmits radar pulses towards a certain target whose target range from the beginning is known. The carrier frequency of the transmitted radar pulses are during the target tracking varied from one pulse to the next following, so that a pulse series including a certain number M of carrier frequencies is treated. The number M is chosen with reference to the continuously measured target range and as long as this range is less than a certain value. If the target range exceeds this value the number M of carrier frequencies is changed and a new pulse series including this new number is transmitted. The unambiguous range to the followed target becomes dependent on the frequency repetition frequency in the transmitted pulse series instead of the PRF of the radar.
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