CN1510423A - Remote control impact data compression method and system for it - Google Patents

Abstract

The chip applied in system is finished by very high speed IC hard ware description and is realized based on programmable gate array. The designed software of the chip comprises five parts of system control module, input module, acoustic pressure level spectrum analysing module, total acoustic pressure level calculating module and output module. The present invention not only can fulfil real time processing for noise signal but also can fulfil real time analysing at the same time for the acoustic pressure level spectrum and the total acoustic pressure level of one route noise signal, so it can be used in fabrication of semiconductor.

Description

Remote measurement is impacted data compression method and is realized the system of this method

Technical field

The invention belongs to domain of telemetry, relate to a kind of system that realizes remote measurement impact data compression method and realize this method.

Background technology

Since shock environment may cause structural failure, member weak point split or fracture, the electronic equipment instantaneous short-circuit, therefore, need telemetry system impact environment to monitor, so that provide foundation for the anti-Environment Design of shock environment control, protection and product.Telemetry system generally adopts the direct measuring shock waves of piezoelectric acceleration sensor, the impact signal of piezoelectricity acceleration sensor output belongs to random signal, for guided missile and carrier rocket, the frequency band range that impact signal is measured is generally 20 hertz to 5,000 hertz, its sample frequency is generally greater than 20,000 hertz, suppose to adopt 10 bits of encoded, the transmission of one road buckles data will take 200 so, the telemeter channel capacity of 000bit/s, this is equivalent to measure 500 road tempolabile signals (as acceleration, pressure, signals such as temperature) needed capacity, measure the guided missile and the telemetry of launch vehicle system of thousands of roads signal for needs, huge impact data volume has been brought huge pressure to it.

In order to solve the contradiction of impacting data and telemetry system capacity, the technology that adopts both at home and abroad mainly contains following two kinds at present:

First kind " F.F. is put slowly ".Only measure some period shock wave, and measurement result is kept in the storer in real time, the impact data of having stored with the data rate transmission that is lower than the impact wave measurement generation are impacted the needed power system capacity of data transmission to reduce then." F.F. is put slowly " only obtains some period shockwave information, abandoned the shock environment information of most of the time paragraph, lost the integrality of data.

Second kind of storage reclaimed.In telemetry system work, adopt magnetic tape recorder or electronic memory real time record to impact data, behind the telemetry system end-of-job, the impact data that reclaim magnetic recording instrument or electronic memory and reset magnetic recording instrument or the interior record of electronic memory.This technical scheme real-time is poor, for the aircraft remote measurement, also has the low problem of the reliability that causes that reclaims.In 1999 the 2nd phases " test of guided missile bullet arrow separate acceleration " literary composition of delivering of " Huabei Polytechnical College journal " Liu Jun, Xiong Jijun, Zhang Wendong, the mode that adopts storage to reclaim is finished the measurement of impact signal.

Summary of the invention

The objective of the invention is to overcome the weak point of prior art, a kind of method that realizes remote measurement impact data compression is proposed, it is by finishing the analysis of impact signal in real time, and with the original time domain measurement data in real time transmission of the alternative impact signal of analysis result, utilize the characteristics of the data volume of impact signal result, realize remote measurement impact data compression much smaller than its original time domain measurement data volume.

The present invention has overcome the weak point of prior art, neither has product to reclaim to bring the problem of the low and real-time difference of reliability, also can obtain the shock environment information of system under test (SUT) work whole process.

Compared with prior art, advantage of the present invention is:

1, the present invention can effectively compress remote measurement and impact data, improves the validity of telemetry system;

2, there is not product to reclaim to bring the problem of the low and real-time difference of reliability in the present invention, can also obtain the shock environment information of system under test (SUT) work whole process;

3, the present invention can obtain shock environment in real time to machinery or effect that electrical system produced;

4, the present invention makes the sample frequency of impact signal and quantizes exponent number and no longer is subjected to the telemetry system capacity limit, can enlarge the measuring accuracy of impact signal range of dynamic measurement, raising impact signal;

5, the present invention has reduced the False Rate of impacting data effectively.Remote measurement impact signal time domain measurement data belong to random signal, channel error code also is at random, if directly transmit remote measurement impact signal time domain measurement data, be difficult to from received signal, effectively differentiate the error code composition, and the impact data compression method that employing the present invention proposes, Channel Transmission be maximum absolute impact acceleration response spectra because maximum absolute impact acceleration response spectra belongs to tempolabile signal, be easy to from received signal, differentiate the error code composition.

Description of drawings

Effect of the present invention is that data are impacted in the compression remote measurement, improves the validity of telemetry system.Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.

Fig. 1 is the shock response spectrum physical model;

Fig. 2 impacts the data compression method synoptic diagram for remote measurement;

Fig. 3 impacts the theory diagram of data compression for realizing three tunnel remote measurements;

Fig. 4 is that data compression system preferred forms structured flowchart is impacted in remote measurement shown in Figure 2;

The maximum absolute impact acceleration response spectra that Fig. 5 obtains in ground experiment for system shown in Figure 4;

The maximum absolute impact acceleration response spectra that Fig. 6 obtains in flight test for system shown in Figure 4.

The design philosophy that data compression method is impacted in remote measurement of the present invention is: the time history that telemetry system generally adopts acceleration transducer directly to measure impact acceleration is shock wave, accurately measuring shock waves is very important, because it is the basis that shock environment is analyzed, but, because shock wave is complicated mode pulse mostly, itself is not easy to analysis and comparison, moreover the final purpose of measuring shock waves is not research shock wave itself, but impact signal institute's produce an effect in machinery or electrical system. Weigh on the engineering shock wave to machinery or electrical system impact effect be shock response spectrum, that is to say that the impact wave measurement data will be processed into shock response spectrum, could analyze shock wave to the impact of machinery or electrical system.

Shock response spectrum refers to single-degree-of-freedom quality spring-damp system, when its common base is subject to when excited by impact the figure that the peak value of response of generation is drawn as the function of single-mode system intrinsic frequency. The shock response spectrum differential equation is

$\stackrel{..}{\mathrm{\&delta;}}\left(t\right)+2{\mathrm{\&xi;\&omega;}}_n\stackrel{.}{\mathrm{\&delta;}}\left(t\right)+{\mathrm{\&omega;}}_{\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="A0215790300102.png,A0215790300103.png"\; state="\{\{state\}\}">n</figure-callout>}}^2\mathrm{\&delta;}\left(t\right)=-\stackrel{..}{u}---\left(1\right)$

In the formula (1), δ=x-u is the displacement of matter piece with respect to pedestal, and u is the absolute displacement of pedestal, ω_nWith ξ be respectively intrinsic frequency and the damped coefficient of system.

Shock response spectrum is followed the example of difference by the response peak value and can be divided into: initial communication spectrum, residual response spectrum, peak response are composed (envelope spectrum of initial communication spectrum and residual response spectrum) three kinds; Can be divided into by used response parameter difference: the absolute acceleration response spectra

Relative displacement spectrum (many clocks such as δ～ω).

Maximum absolute impact acceleration response spectra is the Main Basis of determining the shock environment condition, also is the main result that the remote measurement impact signal is processed. Because the data volume of maximum absolute impact acceleration response spectra is far smaller than the original time measurement data of impact signal, therefore can in the process that impact signal is measured, calculate in real time maximum absolute impact acceleration response spectra, and with the alternative huge impact transfer of data of quantity of maximum absolute impact acceleration response spectra, realize the impact data compression. Simultaneously, because the measuring frequency of shockwave signal and coding exponent number fix, and maximum absolute impact acceleration spectrum is aggregate-value, and therefore, the output frequency of the maximum absolute impact acceleration spectrum of control can obtain the compression ratio of different impact data.

Fig. 2 is that the data compression method schematic diagram is impacted in remote measurement; The method may further comprise the steps:

First step impact signal is measured, acceleration transducer measuring shock waves signal;

The conversion of second step impact signal, shockwave signal is converted to standard voltage signal;

The 3rd step impact signal is handled, and voltage signal is sampled and quantized, and calculates maximum absolute impact acceleration response spectra, the maximin of captured in real time impact acceleration;

The 4th step transmission, the transmission impact signal is in result on the response field and on the time domain.

Fig. 3 impacts the theory diagram of data compression for realizing three tunnel remote measurements.Impact wave measurement module (1) is finished X-axis, Y-axis, the impact wave measurement of three directions of Z axle, impact signal conversion module (2) is converted to the normal voltage signal with three road impact signals of impact wave measurement module output, impact signal processing module (3) is finished the sampling of three road voltage signals of impact signal transformation module (2) output successively, quantize and the real-time X-axis of calculating, Y-axis, the maximum absolute impact acceleration response spectra of three directions of Z axle, the maximal value and the minimum value of the original time domain measurement data of while captured in real time impact signal, and by communication interface output, transport module (4) is finished modulation and the emission to result.

Embodiment

Fig. 4 is a kind of preferred forms that data compression system is impacted in remote measurement shown in Figure 2.An impact signal treating apparatus can be handled 12 road impact signals in real time among Fig. 4, and 3 impact signal treating apparatus can be finished the real-time processing and the compression of 36 road impact signal measurement data simultaneously.Among Fig. 4, shock accelerometer adopts the piezoelectricity acceleration sensor, piezoelectricity acceleration sensor is the acceleration of responsive X-axis, Y-axis, three directions of Z axle simultaneously, when testee during in accelerated motion, be installed on the piezoelectric element step in the jerk acceleration transducer of measured point and produce electric charge, produce being directly proportional of electric charge and impact acceleration on the piezoelectric element step, make jerk acceleration transducer export three road charge signals, its quantity of electric charge is linear with the acceleration of X-axis, Y-axis, three directions of Z axle respectively; Matching used with the piezoelectricity acceleration sensor is triple channel charge/voltage transducer, and the method for this converter using integration is converted to the output of three road voltage signals with three road charge signals of jerk acceleration transducer output; The processing of impact signal adopts random signal band compression device (patent applied for, the patent No. are 02291006.9) to finish.(FPGA) is configured to the impact signal processor with the programmable gate array in the random signal treating apparatus, the random signal treating apparatus just can be finished the impact Signal Processing, result is maximum absolute impact acceleration spectrum, because the survey frequency of shockwave signals and coding exponent number are fixing, and maximum absolute impact acceleration spectrum is aggregate-value, therefore, the output frequency of maximum absolute impact acceleration spectrum is impacted in control, can obtain the ratio of compression of different impact data.Random signal treating apparatus can be finished simultaneously at most the carrying out of 12 road impact signals of four charge/voltage transducers outputs handled in real time, and the result of per three road impact signals is synthesized one road serial data stream, exports by 422 differential interfaces.The central program controller of existing telemetry system provides frame synchronization, yard synchronous and request output signal for three impact signal treating apparatus by 422 differential interfaces, and reads the result of each impact signal treating apparatus by 4222 differential interface timesharing circulation.The output speed of the request output signal control impact signal treating apparatus that the central program controller provides, the request output signal frequency is high more, and the result output data quantity of impact signal is many more in the unit interval, and the compressibility of impacting data is low more, otherwise it is high more to impact data compression rate.Central program device employing frequency-shift keying mode (PCM-FM) is finished the modulation to serial data stream, and the signal that modulates is served channel through after the power amplification by antenna.

Fig. 5 impacts the maximum absolute impact acceleration response spectra that data compression system obtains for remote measurement shown in Figure 4 in ground experiment, this test findings derives from the remote measurement to certain guided missile ground shock explosive test environment, wherein, figure (a), (b), (c) be X-axis respectively, the maximum absolute impact acceleration response spectra of Y-axis and Z axle, X-axis, the impact data compression rate of Y-axis and Z axle is 12.

Fig. 6 impacts the maximum absolute impact acceleration response spectra of certain guided missile model that data compression system obtains for remote measurement shown in Figure 4 in flight test, this test findings derives from the remote measurement to shock environment in certain missile flight test, wherein, figure (a), (b), (c) be X-axis respectively, the maximum absolute impact acceleration response spectra of Y-axis and Z axle, X-axis, the impact data compression rate of Y-axis and Z axle is 12.

Experimental data sees Table 1, table 2, table 3,

Table 1

Sequence number	Parameter name		Parameter value	Remarks
					????1	Handle way		1 the tunnel
????2	Work clock		????81920Hz
					????3	Sample frequency		????20,480Hz
????4	Input Data word is long		????15bit
					????5	Out-put dynamic range		????96db	P (i) in the formula (1) 2, p in (4) i(j) 2
????6	Sound press level spectrum	Analysis frequency	????20Hz～8kHz	Third-octave is analyzed
					????7	Fourier analysis is counted	????1024	The fixed point complement arithmetic
????8		Frequency resolution	????20Hz	?20Hz
					????9	Effective word length	????16bit
????10		Overall sound pressure level	Time domain resolution	6.25 bold and unconstrained second
	????11				Sample number	????128
????12				Zero-bit, maximin output word length				????8bit

Table 2

Sequence number	Pin name	Explanation
			????1	?Clk_Sys	Clock signal
????2	?Reset_Up	Reset signal
			????3	?Fram_Syn	Frame synchronizing signal
????4	?Code_Syn	The sign indicating number synchronizing signal
			????5	?Requst_Plus	The request output pulse signal
????6	?Ctr	The differential interface control signal
			????7	?Clk_A/D	The A/D enabling signal
????8	?Eoc	The A/D ready for data signal
			????9	?Data_U	The time domain accekeration
????10	?PCM	The output of acoustic noise signal result

Table 3

Sequence number	Title		Memory contents	Capacity (bit)
					??1	??X	??X Re	FFT input data and FFT intermediate operations result's real part	???1024×16
??2	??X Im	FFT intermediate operations result's imaginary part	???1024×16
				??3	??Y		??Y Re	FFT input data and FFT intermediate operations result's real part	???1024×16
??4	??Y Im	FFT intermediate operations result's imaginary part	???1024×16
				??5		??Z	??Z Re	The final operation result real part of FFT	???1024×16
??6	??Z Im	The final operation result imaginary part of FFT	???1024×16

Claims (5)

1, a kind ofly realizes that remote measurement impacts the method for data compression, it is characterized in that: carry out real-time analysis at impact signal on the response field and on the time domain, and analysis result is substituted original time domain measurement data transmission, specifically comprise the steps:

The first step: impact signal is measured, acceleration transducer measuring shock waves signal;

Second step: impact signal conversion, shockwave signals are converted to the normal voltage signal;

The 3rd step: impact signal is handled, and voltage signal is sampled and quantized, and calculates maximum absolute impact acceleration response spectra, the maximin of captured in real time impact acceleration;

The 4th the step: the transmission, the transmission impact signal on the response field and time domain on result.

2, the method for data compression is impacted in realization remote measurement according to claim 1, it is characterized in that: with measurement, the processing capacity integrated design of impact signal.

3, the method for data compression is impacted in realization remote measurement according to claim 1, it is characterized in that: adopt internal timing and external event to trigger the segmentation that dual mode is finished the impact signal.

4, the method for data compression is impacted in realization remote measurement according to claim 1, it is characterized in that: adopt impact signal the treating apparatus maximum absolute impact acceleration response spectra of every section impact signal of calculating, the maximal value and the minimum value of the original time domain measurement data of captured in real time impact signal simultaneously in real time.

5, realize the system of the described remote measurement impact of claim 1 data compression, this system comprises: impact signal measurement module (1), impact signal conversion module (2), impact signal processing module (3), transport module (4) is totally four parts, impact signal measurement module (1) is finished the measurement of impact signal, impact signal conversion module (2) is converted to voltage signal with the charge signal of impact signal measurement module output, impact signal processing module (3) is finished the sampling to analog voltage signal, quantize and the impact signal on the response field and the analysis on the time domain, transport module (4) transmission impact signal is at analysis result on the response field and on the time domain.

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