Low prf pulse doppler radar having low speed ground moving target rejection专利检索-梳状滤波器线性滤波器滤波器信号处理专利检索查询-专利查询网

Low prf pulse doppler radar having low speed ground moving target rejection

阅读：439发布：2022-03-15

专利汇可以提供Low prf pulse doppler radar having low speed ground moving target rejection专利检索，专利查询，专利分析的服务。并且An AMTI radar in which the transmitted pulse train is comprised of multiple PRFs which are sequentially switched in a predetermined order during a target dwell time. A digital MTI comb or notch filter having a controlled reject and pass band characteristic for each PRF is utilized such that when operating in one of the lower PRFs, a wide notch characteristic is used for a time after radar pulse transmission during the interval which will provide unambiguous range for the highest PRF, i.e. during the interpulse interval of the highest PRF. Then a narrower notch characteristic is used for the remainder of the interpulse period of the instant PRF. A composite notch filter characteristic is thus obtained for all of the PRFs during a specific target dwell time which will reject not only ground clutter, but also low speed ground moving targets while passing relatively high speed airborne target returns during at least one of the PRFs.，下面是Low prf pulse doppler radar having low speed ground moving target rejection专利的具体信息内容。

权利要求

1. In a pulse Doppler radar system including a transmitter and receiver section wherein said transmitter section is triggered from a pulse repetition frequency (PRF) generator that produces trigger pulses comprised of a plurality of PRFs which are sequentially switched in a predetermined order to produce a plurality of radar output pulses during each target dwell time, the improvement comprising: an MTI filter circuit coupled to the receiver section, having a filter characteristic which is selectively variable and having at least two individually selected reject bands for each harmonic of said plurality of PRFs for rejecting both ground clutter return ignals and selected moving targets; and means coupled to said PRF generator and being responsive to said trigger pulses, said means being coupled to said filter generating and coupling signals thereto for controlling the filter characteristic in response to each PRF and selectively switching the reject band characteristic from one reject band to another during the sequence of said plurality of PRFs.

2. The invention as defined in claim 1 wherein said MTI filter comprises a notch filter and said means switches the filter characteristic from one reject band to another during the interpulse interval of at least one PRF.

3. The invention as defined by claim 2 wherein said at least One PRF comprises one of the lower PRFs.

4. The invention as defined by claim 3 wherein said notch filter circuit comprises a digital notch filter.

5. The invention as defined by claim 1 wherein said MTI filter comprises a notch filter having a wide notch reject band and a narrow notch reject band and wherein said means switches said filter characteristic from a wide notch reject band characteristic to the narrow notch reject band characteristic during the interpulse interval of at least one of the lower PRFs after a time substantially equal to the interpulse period of a higher PRF.

6. The invention as defined by claim 5 wherein said means switches the filter characteristic after a time substantially equal to the interpulse interval of the highest PRF.

7. The invention as defined by claim 1 wherein said plurality of PRFs have a frequency spectrum of at least four to eight normalized frequency units and wherein said at least two reject bands are comprised of substantially + or - 1 1/2 normalized frequency units and + or - 3/4 normalized frequency units respectively.

8. The invention as defined by claim 7 wherein said means switches the filter characteristic during the interpulse interval of at least one of the lower PRFs.

9. The invention as defined by claim 1 wherein said MTI filter comprises a digital notch filter including: input circuit means coupled to said receiver section and accepting the IF signal of a radar return signal therefrom; a first and a second signal summer each having two input ports and one output port and additionally including circuit means coupling said input circuit means to one port thereof; a first time delay circuit coupled between the output port of said first signal summer and the other input port of said second signal summer; a third signal summer having a pair of input ports and one output port; a second time delay circuit coupled between the output port of said second signal summer and one input port of said third signal summer; circuit means coupling the output port of said second signal summer to the other input port of said third signal summer; a fourth signal summer having a pair of input ports and one output port; first signal feedback circuit means coupled from the output port of said second signal summer to one input port of said fourth signal summer and additionally including circuit means coupled to said means controlling the filter characteristic whereby the feedback characteristic is controlled; second feedback circuit means coupled from the output port of said third signal summer to the other input port of said fourth signal summer and including circuit means coupled to said means for controlling the filter characteristic whereby the feedback characteristic of said second feedback circuit means is controlled; circuit means coupling the output port of said fourth signal summer to the other input port of said first signal summer; and output circuit means coupled to the output port of said third signal summer.

10. The invention as defined by claim 9 wherein said first and second time delay circuits have a time delay substantially equal to the interpulse interval of said plurality of pulse repetition frequencies.

11. The invention as defined by claim 10 wherein said first and second feedback circuit means comprises feedback amplifiers having the respective gain characteristic thereof controlled by said means controlling the filter characteristic.

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Low prf pulse doppler radar having low speed ground moving target rejection

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