Stepped frequency signal generation method based on frequency selective output of initialize switch of phase-locked loop

Abstract

The invention discloses a stepped frequency signal generation method based on the frequency selective output of initialize switches of phase-locked loops, which is characterized in that a phase-locking circuit comprising the phase-locked loops, an isolation amplifier, a single-pole double-throw high-velocity electronic switch, a pulse modulator and a large-scale programmable device generates a stepped frequency signal; the phase-locked loops realize the bandwidth and the frequency hopping interval of the stepped frequency signal of a radar; the isolation amplifier isolates the influence of the standing waves generated by the switching of the single-pole double-throw high-velocity electronic switch on locking phases of the phase-locked loops; the single-pole double-throw high-velocity electronic switch switches by taking a pulse modulation periodic signal as a trigger between the two phase-locked loops; the pulse modulator realizes pulse modulation by taking the pulse modulation periodic signal as a control signal; and the large-scale programmable device outputs corresponding control orders to the phase-locked loops by taking the pulse modulation periodic signal as a beat and carries out alternated frequency initialization on the two phase-locked loops to realize stepped frequency. The invention has minimum volume and weight in the traditional stepped frequency signal generation scheme when sufficiently meeting the requirements for frequency bandwidths and frequency intervals.

Description

technical field [0001] The invention relates to a radar pulse signal frequency synthesis method, in particular to a step frequency signal generation method based on the frequency selection output of a phase-locked loop preset switch. The target is sampled in the frequency domain by emitting discrete step-frequency pulses. Background technique [0002] Radar step frequency pulse signal (referred to as step frequency signal) is a commonly used high-resolution transmission signal. In form, it is a group of continuous pulse trains triggered by stepping frequency hopping pulses with a fixed frequency difference as the frequency hopping interval, according to the fixed frequency hopping rule. Its essence is to sample the target in the frequency domain by emitting discrete step-frequency pulses and then process it in the time domain. On the premise of not increasing the signal bandwidth, the composite distance profile of the target is obtained through the coherent synthesis of the...

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Problems solved by technology

[0008] The problem to be solved by the present invention is to aim at the limitations of volume, weight, bandwidth, frequency resolution, frequency conversion time and other indicators that cannot be taken into account in the commonly used radar step frequency signal generation methods. According to the characteristics of radar step frequency signals, a A new frequency synthesis method is proposed to unify the above indicators to form a modular radar step frequency signal generation method to meet the requirements of radar for the form of step frequency signals

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