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Doppler frequency shift simulation method and device based on general medium frequency transceiver

A technology of Doppler frequency shift and simulation device, which is applied in the direction of measurement device, utilization of re-radiation, reflection/re-radiation of radio waves, etc., can solve the problems of long maintenance period, low frequency accuracy and high filter requirements, and achieve Reduce maintenance time and cost, enhance portability, avoid demanding effects

Inactive Publication Date: 2014-10-15
GUANGZHOU HANGXIN AVIATION TECH CO LTD
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AI Technical Summary

Problems solved by technology

The Doppler frequency shift test equipment realized by this method requires the design of special hardware circuits, high requirements for filters, low frequency accuracy, poor software portability, and hardware and software are not easy to upgrade
[0003] Existing traditional Doppler frequency shift simulators use single sideband modulation to realize frequency shift, which are mostly implemented in hardware and have high requirements for filters. This software has poor portability and is not easy to upgrade. Once a fault occurs, the entire The hardware circuit board is repaired, the repair cycle is long, and normal work cannot be restored in a short time

Method used

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  • Doppler frequency shift simulation method and device based on general medium frequency transceiver
  • Doppler frequency shift simulation method and device based on general medium frequency transceiver
  • Doppler frequency shift simulation method and device based on general medium frequency transceiver

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Embodiment Construction

[0025] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0026] refer to figure 1 , the flowchart of the inventive method is mainly divided into five steps:

[0027] A. Collect the radar mode of Doppler radar through the audio generator collector

[0028] The Doppler radar sends out two signals, the back signal (BACK) and the left signal (LEFT), which determine the radar mode (mode format (BACK, LEFT)). Both signals are high and low level signals with a certain period. Doppler The frequency shift simulator determines whether the mode is (0, 0), (0, 1), (1, 0) or (1, 1) through the audio generation collector.

[0029] B. Calculate the total frequency shift through the preset speed and the above radar mode

[0030] First, set the heading, lateral, and vertical speeds of the aircraft to be simulated, and at the same time receive the mode signal sent by the Doppler radar at this time, and calculate the t...

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Abstract

The invention discloses a doppler frequency shift simulation method and device based on a general medium frequency transceiver. The method comprises the steps that A, an audio generation collector acquires a radar mode; B, frequency shift amount is calculated through preset speed and the radar mode; C, the reference frequency of a doppler radar is received and filtering is carried out after down conversion; D, up conversion is carried out on a filtered signal, so as to generate a signal after frequency shift; and E, the signal is sent to the doppler radar and is compared with a reference signal. According to the invention, based on the medium frequency transceiver in the existing general PXI modular instrument, the total frequency shift amount is calculated through the acquired radar mode and the preset speed; up and down conversion and digital filtering are carried out on the signal to simulate doppler frequency shift; a high requirement on a special hardware circuit in the traditional technology is solved; the precision and the portability are improved; the repair time and the cost are reduced; and the doppler frequency shift simulation method and device based on the general medium frequency transceiver can be widely applied to the technical field of aviation.

Description

technical field [0001] The invention relates to the field of aviation technology, in particular to a Doppler frequency shift simulation method and device based on a general-purpose intermediate frequency transceiver. Background technique [0002] The development of aviation technology requires the maintenance of airborne equipment to keep up with the pace. Most of the traditional Doppler frequency shift test equipment is realized by single sideband modulation. The Doppler frequency shift test equipment realized by this method requires the design of special hardware circuits, high requirements for filters, low frequency accuracy, poor software portability, and the hardware and software are not easy to upgrade. [0003] Existing traditional Doppler frequency shift simulators use single sideband modulation to realize frequency shift, which are mostly implemented in hardware and have high requirements for filters. This software has poor portability and is not easy to upgrade. On...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/02G01S13/58
CPCG01S7/4052
Inventor 邹丹陈洪雨陈波
Owner GUANGZHOU HANGXIN AVIATION TECH CO LTD
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