Inter-pulse frequency hopping control method and device

Abstract

The invention discloses an inter-pulse frequency hopping control method and a device, and the control method comprises the following steps: detecting a high level / low level of a frame pulse; setting afirst threshold, a second threshold, and a frequency code value group according to a state in which the frame pulse is at a high level / low level, and acquiring a pulse number of the PRF signal; selecting and outputting a frequency code value according to the magnitude of the pulse number and the first threshold and the magnitude of the pulse number and second threshold. The control device comprises: a clock module, an FPGA module, a bus transceiver module and a driving module. According to the inter-pulse frequency hopping control method and device, each frame re-receives, a frequency code value group is randomly generated by a radar system, the starting position of each frame frequency hopping and the time interval of the time hopping can be flexibly adjusted, thereby significantly improving the radar anti-interference and low intercept performance.

Description

technical field [0001] The invention relates to the technical field of radar, and specifically relates to a method and device for controlling pulse-to-pulse frequency hopping. Background technique [0002] Frequency hopping anti-jamming technology is widely used in electronic countermeasure systems. Modern radar and communication equipment almost all use frequency hopping technology to improve anti-jamming capability. Its own characteristics greatly improve the ability of anti-jamming and interception. In radar systems increasingly important. The traditional pulse-to-pulse frequency hopping technology is to store all the frequency points generated by the radar system simulation in advance in the table, and when the waveform generation module receives the pulse-to-pulse frequency hopping function command, it will store all the frequency points in the table from the beginning to the end in order in each PRF cycle send out. The modern radar pulse-to-pulse frequency hopping fu...

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Problems solved by technology

[0004] The traditional frequency hopping between pulses according to the table mainly has the following disadvantages: the frequency hopping code storage table is not real and random, although each frequency code table is generated by the system according to a random function, and then stored in the receiver control software, but these table generation After that, it is fixed, and the randomness is lost. After a long-term detection of the radar excitation signal, the jamming system can know the frequency hopping sequence of the carrier frequency of the radar excitation signal, that is, know the frequency hopping sequence of each table. The potential detection risk of this pulse-to-pulse frequency hopping anti-jamming function is very high; the time interval of each frequency hopping is too single and the regularity is too strong. Traditional pulse-to-pulse frequency hopping each frequency hop is performed according to the PRF cycle, and the time interval is very fixed. , no variability and unguessability, easy to be detected by the anti-jamming system PRF cycle parameters

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