CN1317901A

CN1317901A - Co-clock timing method for signal interference detection

Info

Publication number: CN1317901A
Application number: CN 00113367
Authority: CN
Inventors: 张友山; 袁正午; 穆建宏
Original assignee: Central South University
Current assignee: Central South University
Priority date: 2000-04-11
Filing date: 2000-04-11
Publication date: 2001-10-17
Anticipated expiration: 2020-04-11
Also published as: CN1176542C

Abstract

A co-clock timing method for signal interference detection features that the timing clock signals (or after frequency division) for generating the signals to be transmitted in transmitter are directly transmitted to receiver, so a clock is used by both transmitter and receiver for higher precision of signal interference detection.

Description

The synchronic clock timing method that signal coherence detects

The present invention relates to a kind of measured signal and reference signal synchronous coherence detection fully that makes.

At present, in a sending/receiving system that constitutes by transmitting apparatus (or device) and receiving equipment (or device), receiving equipment detects the signal that is sended over by medium by transmitting apparatus, and the waveform of this signal and frequency are determined by the timer clock that places transmitting apparatus.In order to realize the coherent detection purpose of measured signal, transmitting apparatus also needs receiving equipment simultaneously directly from transmitting apparatus transmits (be not generally altogether transmit) with reference signal frequently by certain mode with measured signal and uses for receiving equipment.The measured signal that receiving equipment receives be exactly forward position with this reference signal be that starting point begins to be sampled or to be converted, but be by another timer clock decision in the receiving equipment to the timing of sampling control signal sampling pulse or to the timing of control transformation time.Therefore when these two timer clocks have timing error (owing to the precision of crystal oscillator is limited, this kind error inevitably exists), the repetition period of the measured signal after being quantized in the receiving equipment or being converted be quantized or be converted before signal period unequal, so just bring error to the coherent detection of signal.So being a kind of coarse coherence detection that is promptly caused by two clocking errors that are in respectively in transmitting apparatus and the receiving equipment by timing error, this can be described as coherent detection not exclusively synchronously.For example the induced polarization instrument (as F-1 multi-parameter frequency spectra induced polarization instrument) of extensive use at present, Transient Electromagnetic Apparatus (when carrying out transient electromagnetic sounding with GDP-16) wait and all adopt this not exclusively synchronous coherent detection in the instrument.

The purpose of this invention is to provide fully synchronously coherence detection of a kind of realization signal, above-mentionedly have two timer clocks to have the coherent detection error that causes timing error and cause to overcome.

The present invention removes the timer clock to timing of sampling control signal sampling pulse or control transformation signal in the receiving equipment, and the timing clock signal of the transmission signal (measuring for receiving equipment) that transmitting apparatus in the observation system is formed directly is transferred to receiving equipment by photoelectricity coupling or transformer coupled or transmitting antenna, the timer clock that replaces receiving equipment realizes that transmitting apparatus sends timing and the timing of receiving equipment sampling control signal or the shared timer clock of timing of control transformation signal of signal.The timing clock signal of transmitting apparatus also suitably frequency division to make its frequency be to be transferred to the timer clock that receiving equipment is made sampling control signal behind the multiple of the sampling control signal frequency in the receiving equipment.

The signal coherence that the present invention is suitable for the observation system that is made of transmitting apparatus and receiving equipment detects.

Compare with the existing coherence detection of two timer clocks of using, the present invention has following characteristics:

Send timing and the timing of receiving equipment sampling control signal or the shared timer clock of timing of control transformation signal of signal owing to realize transmitting apparatus, measured signal is quantized or change after data repetition period and quantification or the measured signal cycle before the conversion equate fully, improve the precision that signal coherence detects, thereby realize signal coherent detection fully synchronously.

Adopt the precision sampling that coherence detection can realize and measured signal is synchronous fully fully synchronously of synchronic clock signal in receiving equipment, not enough or the superfluous situation of sampled data promptly in any definite sampling interval, can not occur, thereby can obtain the accurate fourier transform result of measured signal.

Adopt synchronic clock signal fully synchronously coherence detection can in receiving equipment, form altogether clock-timed and simulate fourier transform to measured signal accurately with the measured signal fourier transform waveform of frequency together.

Adopt the fully synchronous coherence detection of synchronic clock timing signal can in receiving equipment, form clock-timed and synchronous fully rectified signal realization complete synchronous detecting or all-wave and the half-wave precision rectifying to measured signal of measured signal altogether.

Adopt the fully synchronous coherence detection of synchronic clock timing signal can realize that measured signal is the coherent detection fully synchronously of multifrequency complex wave.

Description of drawings:

Fig. 1. the clock signal in the transmitting apparatus is given the electrical schematic diagram of receiving equipment by the photoelectricity coupled transfer;

Fig. 2. the clock signal in the transmitting apparatus is by the transformer coupled electrical schematic diagram that is transferred to receiving equipment;

Fig. 3. the clock signal in the transmitting apparatus is transferred to the electrical schematic diagram of receiving equipment by the antenna emission.

The present invention is further illustrated with reference to the accompanying drawings below:

1. as shown in Figure 1, clock signal (its frequency is the multiple of sampling control signal in the receiving equipment) behind the clock signal 1-1 of transmitting apparatus or the suitable frequency division of process frequency divider F, being sent on the one hand CPU is used for forming to underground or send the waveform of signal and the timer clock of frequency to testee, the transmission signal of clock formation passes through electrode A thus, B sends and is received equipment reception becoming measured signal, deliver to by triode 3DG12 by K switch again on the other hand, the light-emitting diode of optical-electrical converter 3N33 and resistance R 1, R2, the amplifier that R3 forms amplifies, and conversion of signals is become light signal by light-emitting diode, this signal is received and is exaggerated the timer clock 1-2 that forms the receiving equipment sampling control signal by the phototriode among the 3N33 (resistance R 4 is its load resistance), for coherent detection circuit 1-3 regularly, measured signal is by collecting electrode M, N enters the coherent detection circuit in the receiving equipment.

The coherent detection circuit of receiving equipment part changes the coherent detection fully synchronously that synchronized sampling circuit, analog multiplier, half-wave or full-wave rectifying circuit, double frequency or multifrequency complex wave change-over circuit then can be realized accurate fourier transform, simulation fourier transform, complete synchronous detecting or all-wave and half-wave precision rectifying, double frequency or multifrequency complex wave respectively respectively in the circuit, obtains the high Precision Detection result.

2. as shown in Figure 3, clock signal (its frequency is the multiple of sampling control signal in the receiving equipment) behind the clock signal 1-1 of transmitting apparatus or the suitable frequency division of process frequency divider F, being sent on the one hand CPU is used for forming to underground or send the waveform of signal and the timer clock of frequency to testee, the transmission signal of clock formation passes through electrode A thus, B sends and is received equipment reception becoming measured signal, deliver to by triode 3DG12 and resistance R 1 by K switch again on the other hand, R2, the amplifier that the primary coil of transformer T is formed amplifies, and process transformer T coupling is delivered in the receiving equipment, by 3DG12, resistance R 3, R4, R5, the amplifier that the secondary coil of transformer T is formed amplifies, form the timer clock 2-2 of receiving equipment sampling control signal, regularly for coherent detection circuit 2-3.Measured signal enters coherent detection circuit in the receiving equipment by collecting electrode M, N.

3. as shown in Figure 3, the clock signal 3-1 of transmitting apparatus is gone out by the transmission antennas transmit that is arranged in transmitting apparatus and receives for the reception antenna that is arranged in receiving equipment.Clock signal (its frequency is the multiple of sampling control signal frequency in the receiving equipment) behind the clock signal 3-1 of transmitting apparatus or the suitable frequency division of process frequency divider F, being sent on the one hand CPU is used for forming to underground or send the waveform of signal and the timer clock of frequency to testee, the transmission signal of clock formation sends by electrode A, B thus, and the equipment that is received receives and becomes measured signal.The amplifier of being formed by VMOS triode KV50, transformer T1 and resistance R 1, R2, R3 amplifies on the other hand, launches in the mode of radio wave from sky through the transmitting antenna that is attached thereto through the resonant tank that secondary and capacitor C 1 by T1 constitute again.The reception antenna of receiving equipment is from the sky received signal, the tuner of forming by transformer T2 and capacitor C 1 is coupled in the amplifier of being made up of triode 3DG12 resistance R 4, R5, R6 and amplifies, form receiving equipment sampling control signal clock for coherent detection circuit 3-3 regularly, measured signal enters coherent detection circuit in the receiving equipment by collecting electrode M, N.

Claims

1. the synchronic clock timing method that detects of a signal coherence, it is characterized in that: the timing clock signal of the transmission signal (measuring for receiving equipment) that transmitting apparatus in the observation system is formed directly is transferred to receiving equipment by the photoelectricity coupling, the timer clock that replaces receiving equipment realizes that transmitting apparatus sends timing and the timing of receiving equipment sampling control signal sampling pulse or the shared timer clock of timing of control transformation signal of signal.

2. the synchronic clock timing method that detects of a signal coherence, it is characterized in that: the timing clock signal of the transmission signal (measuring for receiving equipment) that transmitting apparatus in the observation system is formed directly is transferred to receiving equipment by transmitting antenna, the timer clock that replaces receiving equipment realizes that transmitting apparatus sends timing and the timing of receiving equipment sampling control signal sampling pulse or the shared timer clock of timing of control transformation signal of signal.

3. the synchronic clock timing method that detects of a signal coherence, it is characterized in that: the timing clock signal of the transmission signal (measuring for receiving equipment) that transmitting apparatus in the observation system is formed is by the transformer coupled receiving equipment that directly is transferred to, the timer clock that replaces receiving equipment realizes that transmitting apparatus sends timing and the timing of receiving equipment sampling control signal sampling pulse or the shared timer clock of timing of control transformation signal of signal.

4. according to claim 1 or 2 or 3 described methods, it is characterized in that: the timing clock signal of transmitting apparatus suitably frequency division to make its frequency be to be transferred to the timer clock that receiving equipment is made sampling control signal behind the multiple of the sampling control signal frequency in the receiving equipment.