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Radar intermediate-frequency signal generator

An intermediate frequency signal and generator technology, applied in the field of radar intermediate frequency signal generators, can solve the problems of unfavorable system miniaturization, high cost, and large space occupation

Inactive Publication Date: 2012-06-06
INST OF ELECTRONICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, using the traditional method, to generate an intermediate frequency signal, two point frequency signals (one for the baseband signal source as the DAC conversion clock, and the other for the quadrature modulator as the intermediate frequency local oscillator) require a quadrature modulator and two low-pass filters
Therefore, in terms of implementation, this method occupies a relatively large space and costs relatively high, which is not conducive to the miniaturization of the system.

Method used

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Embodiment Construction

[0013] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0014] Please refer to figure 2 , the present invention is mainly composed of a digital waveform memory controlled by a control circuit, a cache memory, a digital-to-analog converter (DAC), a band-pass filter (BPF) and an amplifier. Before the external PRF signal arrives, the control circuit first transmits the digital waveform data in the digital waveform memory to the cache at low speed, and then under the trigger of the PRF signal, the data in the cache is read out at the conversion rate of the DAC and sent to the DAC , after the output analog signal is band-pass filtered and signal amplified, the required broadband intermediate frequency signal is obtained.

[0015] Preferably, the waveform digital memory used in the present invention may be a memory inside an FPGA (Field Programmable Gate Array), which stores pre-distorted digital waveforms.

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Abstract

The invention discloses a radar intermediate-frequency signal generator, mainly comprising a digital waveform memory, a high-speed cache, a high-speed DA, a band-pass filter and an amplifier; and before an external PRF signal reaches, the digital waveform data in the digital waveform memory is transmitted to the cache at low speed by a control circuit, the data in the cache is read out at the DACconversion rate under the trigger of the PRF signal and then sent to the DAC, after band-pass filter and signal amplification are carried out on the output analogue signal, the required broadband intermediate-frequency signal is obtained.

Description

technical field [0001] The invention relates to a radar exciter, in particular to a radar intermediate frequency signal generator used for the radar exciter. Background technique [0002] Radar exciter is an important part of radar. The generation of the IF signal of the traditional radar exciter is to generate two orthogonal I and Q signals through the baseband signal source, and then perform quadrature modulation with the IF local oscillator to obtain the IF signal. Its working principle block diagram is as follows figure 1 As shown, using direct digital synthesis (Direct Digital Synthesis-referred to as DDS) or direct digital waveform synthesis (Direct Digital Waveform Synthesis-referred to as DDWS) method to generate two orthogonal I and Q signals, which are respectively passed through the low-pass filter, with The intermediate frequency local oscillator directly modulates them, and then bandpass filters and amplifies them to filter out harmonics and spurs to obtain th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/282
Inventor 李和平王岩飞
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI