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

A technology of signal generation and preset switching, used in automatic power control, electrical components, radio wave measurement systems, etc.

Inactive Publication Date: 2010-12-15
中国兵器工业第二〇六研究所
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  • Abstract
  • Description
  • Claims
  • Application Information

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

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Embodiment Construction

[0025] figure 1 Preferred embodiments of the invention are provided. Such as figure 1 As shown, the reference clock fr determines the frequency interval of the output signal. If PLL 1 and PLL 2 use a prescaler internally, the frequency interval is fr divided by the frequency division ratio of the prescaler. Phase-locked loop 1 and phase-locked loop 2 are controlled by the phase-locked loop control code output by the large-scale programmable device control circuit (corresponding to figure 2 PLL2MA[7..0], PLL1MA[7..0]) control, with pulse modulation cycle (corresponding figure 2 Middle BPMCH) is the trigger, and outputs the odd frequency points and even frequency points within the signal bandwidth respectively. When power is applied, both PLL 1 and PLL 2 are in the initial state of the first point. When the first pulse modulation cycle arrives, the two-choice switch (that is, the single-pole double-throw high-speed electronic switch, the same below) is strobed PLL 1, PLL 1...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/08G01S7/28
Inventor 王栋雷国忠郝金华梁文博余铁军
Owner 中国兵器工业第二〇六研究所
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