Processing method of heterodyne analog dynamic object signal

Abstract

The invention provides a processing method of a heterodyne analog dynamic object signal, and is aimed at providing dynamic object signal analog method with small hardware resource consumption. The method is realized through the following technical scheme: (1) externally hanging a memory set M on an FPGA (field programmable gate array), carrying out down frequency mixing processing and A / D conversion on a first intermediate frequency signal received by a dynamic object signal simulator, directly storing a low intermediate frequency signal after the A / D conversion in the externally hung memory set M to carry out time delay, using a clock f[R] carrying Doppler frequency corresponding to a speed parameter and change rate of the Doppler frequency to read out data in the externally hung memory set M, through a D / A converter and frequency mixing on intermediate frequency, carrying out outputting, and carrying out distance speed and acceleration simulation; (2) using a monitor processing computer to input a track parameter, calculating time delay and an amplitude attenuation value, and carrying out simulation on an object distance; (3) adding Doppler frequency and change rate corresponding to speed and acceleration in the track parameter to a reading data clock, wherein, readout data carries the corresponding Doppler frequency and change rate, and a dynamic object signal is formed.

Description

technical field

[0001] The invention relates to a method for processing intermediate frequency signals when simulating dynamic target signals in the field of measurement and control. Background technique

[0002] In the prior art, the simulation of target signals such as distance, speed, acceleration, etc. is realized by simulating the time delay and amplitude change of the echo signal. Generally, the distance measurement of the continuous wave measurement and control signal is realized by phase measurement. When the distance of the target changes, the phase of the received echo will also change, and the echo Doppler frequency shift will be generated accordingly , and the phase difference between the corresponding sending and receiving signals is , changes continuously with time, that is, the distance changes with time. At the same time, the simulation of velocity and acceleration is also realized through Doppler frequency shift and its rate of change. However, the exi...

Examples

Embodiment Construction

[0016] The present invention is further illustrated below by way of examples. In the following examples, according to figure 1 For the timing diagram of storage read and write control, in the programmable gate array chip FPGA external memory group M, the first intermediate frequency signal received by the heterodyne dynamic target signal simulator with IF LO The second IF is obtained by heterodyne down-mixing , the intermediate frequency signal after deceleration After being converted by the analog-to-digital converter (A / D), it is directly stored in the external memory group M as the distance delay for delay, and the clock with the corresponding Doppler frequency and its rate of change is used Read the data in the external memory group M, and get the second intermediate frequency signal with Doppler frequency after passing through the digital-to-analog converter (D / A) , with IF LO First IF with Doppler frequency obtained by heterodyne upmixing Output, for dist...

technical field

[0001] The invention relates to a method for processing intermediate frequency signals when simulating dynamic target signals in the field of measurement and control. Background technique

[0002] In the prior art, the simulation of target signals such as distance, speed, acceleration, etc. is realized by simulating the time delay and amplitude change of the echo signal. Generally, the distance measurement of the continuous wave measurement and control signal is realized by phase measurement. When the distance of the target changes, the phase of the received echo will also change, and the echo Doppler frequency shift will be generated accordingly , and the phase difference between the corresponding sending and receiving signals is , changes continuously with time, that is, the distance changes with time. At the same time, the simulation of velocity and acceleration is also realized through Doppler frequency shift and its rate of change. However, the exi...

Examples

Embodiment Construction

[0016] The present invention is further illustrated below by way of examples. In the following examples, according to figure 1 For the timing diagram of storage read and write control, in the programmable gate array chip FPGA external memory group M, the first intermediate frequency signal received by the heterodyne dynamic target signal simulator with IF LO The second IF is obtained by heterodyne down-mixing , the intermediate frequency signal after deceleration After being converted by the analog-to-digital converter (A / D), it is directly stored in the external memory group M as the distance delay for delay, and the clock with the corresponding Doppler frequency and its rate of change is used Read the data in the external memory group M, and get the second intermediate frequency signal with Doppler frequency after passing through the digital-to-analog converter (D / A) , with IF LO First IF with Doppler frequency obtained by heterodyne upmixing Output, for dist...

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