CN201035133Y - Positioning device of low data flow arrival time difference - Google Patents

Abstract

The utility model belongs to the technology field of radio emission source location and acoustic wave source location, specifically relates to a time difference location device of arrival of low data flow, comprising receivers, a data exchanging network, a information processing master station and a network connection. Each of the N receivers is respectively via the network connection connected with data exchanging network witch is connected with the information processing master station via the network connection. Wherein N is more than or equal to 2 and less than or equal to 10000. The utility model is simple in structure, novel in conception without increasing hardware cost. The device distributes the signal correlation and the test of the time difference to each receiver for local execution to avoid transmission of original signal data, thus to greatly reduce the data flow in the location process.

Description

Low data traffic difference time of arrival locating device

Technical field

The utility model belongs to radio transmission source location harmony wave source field of locating technology, is specifically related to a kind of low data traffic difference time of arrival locating device.

Background technology

In radio control, the communication network development, radar equipment detection, underwater sound detection, national security and military surveillance activity, often need the source position of coming of measurement space radiowave and sound wave.Time of arrival, the difference location was passed through to measure the mistiming that same signal arrives each receiver in the locating device, calculated the source position of coming of this signal.Usually in the difference locating device N receiver (N＞=2) arranged time of arrival, receiver is furnished with receiving sensor.Such as radio wave antenna or underwater sound microphone.As the 1st and J receiver (1＜=I＜=N, 1＜=J＜=N), receive same signal, and detect the mistiming t (i that this signal arrives the receiver sensor, j), on surface level, to pass through I, the straight line of J center sensor position is the x axle, with I, the perpendicular bisector of line segment is the y axle between the J center sensor, sets up rectangular coordinate system, can draw signal and be positioned at the hyperbolic function curve that meets following formula (1) according to the medium medium wave with the physical phenomenon of constant speed rectilinear propagation and the derivation of basic analytical geometry.

$\frac{x^2}{\frac{1}{4}{v}^{2}t{(i,j)}^2}-\frac{{\mathrm{<figure-callout\; id="2"\; label="y"\; filenames="Y20072006971500071.png"\; state="\{\{state\}\}">y</figure-callout>}}^2}{\frac{1}{4}({4L}^2-v^{2}t{(i,j)}^2)}=1---\left(1\right)$

Wherein, v is the ripple transmission speed, L be I, J transducer spacing from half.If have 3 or 3 above receivers to measure simultaneously, just can obtain N hyperbolic function, their common intersection is exactly the signal launch site.Also can be with 2 receiver shift positions, repeatedly poor time of arrival to the signal measurement that same signal source is sent, be used to cross thereby obtain a plurality of hyperbolic function.

For the solid space situation, the hyperbolic curve that signal source is positioned at formula 1 description is that the center rotates on the surfaces of revolution that obtains with the x axle.

The crucial difficult point of this method and equipment therefor is signal correction, promptly by mating the signal that each receiver is received, finds same signal or signal characteristic point in time that each receiver receives.Traditional time of arrival of difference direction finding need send to same computing machine to the signal that each receiver is intercepted and captured, and might as well claim main website, calculates that to measure same signal poor to the time of arrival of each receiver thereby mate.For the application of the many signal framings of broadband signal and broadband, just need transmit lot of data.The operation of such high amount of traffic amount, for the device that adopts wireless communication network or the wired networking of low rate, become consuming time huge, the work that is difficult to finish.This situation is a difficult problem for vehicle-mounted, portable movement station and field studies.

Summary of the invention

The purpose of this utility model is to propose that a kind of data traffic is low, and environmental suitability is strong, and processing speed is fast, the low data traffic difference time of arrival locating device of hardware systems compatibility.

The low data traffic difference time of arrival locating device that the utility model proposes connects 4 by receiver 1, data switching networks 2, information processing main website 3, network and forms, and its structure as shown in Figure 1.Receiver 1 is the N platform, and every receiver connects 4 by network respectively and is connected with data switching networks 2, and data switching networks 2 connects 4 link informations processing main website 3 by network, wherein, and 2≤N≤10000.

In the utility model, network connects 4 can adopt wired or wireless connections.

In the utility model, data switching networks 2 can adopt the Internet, LAN (Local Area Network), computing machine is interconnected or private network in any.

In the utility model, information processing main website 3 can adopt the control computer of band receiver.

In the utility model, each receiver 1 is in parallel.

In the utility model, receiver 1 is synchronous by external trigger to N, in identical time acquired signal, and signal storage at local storage, such as hard disc of computer.The external trigger synchronizing signal can be any relevant clock reference, such as the electric pulse of the pulse per second (PPS) of GPS, the driving of same clock source, the time clock that atomic clock produces.Receiver is analyzed in the signal of this locality storage and is searched signal of interest, when finding that object signal is when certain signal record occurs, the record that receiver was gathered by identical separately time of other receiver analysis of main website order, and recording feature sent to each receiver.This feature can be one or more of following information:

(1) the object signal time domain waveform of extracting through filtering

(2) time domain waveform analog demodulator result is such as separating amplitude modulation, separate frequency modulation, separating the waveform of phase modulation

(3) parameter of the waveform basis component that obtains after time domain waveform is resolved such as being the frequency-modulated wave bag of limited Gaussian envelope with signal resolution, and is extracted the parameter of primary waves bag.

(4) the digital demodulation result of time domain waveform is such as the bit number code stream of GSM pulse.

The record that every receiver is gathered the corresponding identical time of this receiver according to the feature of sending carries out signal Processing and obtains the zero-time t (i) of individual features in local record, and i is the receiver sequence number.Each receiver sends to main website with t (i).2 main websites can calculate the mistiming that same signal arrives any two receivers according to following formula.

t(i，j)＝t(i)-t(j)(2)

Basis again $\frac{x^2}{\frac{1}{4}{v}^{2}t{(i,j)}^2}-\frac{{\mathrm{<figure-callout\; id="2"\; label="y"\; filenames="Y20072006971500071.png"\; state="\{\{state\}\}">y</figure-callout>}}^2}{\frac{1}{4}({4L}^2-v^{2}t{(i,j)}^2)}=1$ (1 can obtain all in twos combination receiver to the location hyperbolic curve of signal of interest, thereby signal source is located.

The course of work of the present utility model is as follows:

With receiver quantity N=4 is example, and the control computer of information processing main website 3 and first receiver 1 merges, and promptly main control software is installed on the computing machine of first receiver 1.All receivers adopt GPS pulse per second (PPS)s to trigger, in same second, and the moment that begins in ensuing each second, and the signal that recorder is arrived, and record the hard disc of computer of this receiver with document form.Might as well claim receiver i k second be recorded as F (i, k), 1＜=i＜=N wherein, 0＜=k＜2 ⁶⁴Suppose that k expresses with 64 integers of 2 systems.

The first step, first receiver 1 computing machine analyzed in signal file and searched interested signal.Extract signal characteristic after finding signal of interest, and with signal record k, signal forming time t (1, k), signal characteristic type, signal characteristic parameter or waveform be submitted to main website software as object signal information.

Wherein characteristic type can be decided according to object signal.Below give an example respectively.

(1) for the signal of no any prior imformation, can adopt the method for frequency domain filtering to extract the composition waveform that accounts for the spectrum power main body in the signal, this waveform itself constitutes the filtering parameter of matched filter, this wave filter is sent to all receivers, with this filter filtering or make relevant treatment, just can obtain the time of origin of object signal.

(2), can carry out analog solution amplitude modulation, separate frequency modulation, separate phase modulation at 1 pair of signal record of receiver for the signal that amplitude, frequency, phase modulation (PM) are arranged.This method such as frequency modulation broadcasting, intercom emission effectively, also is effective for digital modulation not only for modulated-analog signal.All effective such as separating frequency modulation for frequency keying, phase keying.

(3),, can resolve into the frequency modulation or the equifrequent packet of pulses of several Gaussian envelope such as signals such as radar pulse, sonar pulses for distinctive signal.Receiver 1 can send to main website with time, frequency, phase place and the frequency modulation information extraction of packet of pulses and as signal characteristic.

(4) for the digital modulation signals of known modulation parameter,, can do corresponding demodulation at receiver 1 such as common communicating protocols such as GSM, CDMA, ZigBee, the numeric code of restoring signal or bit stream, and it is sent to main website as signal characteristic.

In second step, information processing main website 3 submits to the object signal information of coming to send to all other receivers 1 first receiver 1, and requires to receive the reception of information and carry out Signal Matching.

In the 3rd step, other receiver 1 extracts record k, carries out signal Processing and extract object signal that (i, k) (i k), and sends to main website to the time of origin t at record F according to the characteristic type of object signal information.For (1) in the first step-(4) situation, carry out matched filtering or relevant, analog demodulator respectively, signal content decomposes and the digital demodulation decoding.

In the 4th step, the t that receiver returns receives in information processing main website 3, and (i, k), 1＜=k＜=N calculates the object signal position according to formula 1,2.

With the GSM signal is example, locatees a GSM pulse, and the data of Network Transmission are two-way 147 bits, totally 294 bits.And each receiver of classic method must transmit pulse original base band data, is example with 14 bit quantization IQ two-way, 4 of every information bit samplings, must transmit 16464 bits.The utility model has reduced by 99% data transmission.Under identical network condition, the utility model can be finished the location more quickly.

The utility model can be used for radio transmission source location harmony wave source location.The utility model is simple in structure, and is novel, do not increase hardware cost.This device is distributed to the local execution of each receiver with signal correction and time difference measuring, has avoided a large amount of transmission original signal data, thereby the data traffic in the position fixing process is reduced greatly.

Description of drawings

Fig. 1 is a structural diagrams of the present utility model.

Number in the figure: 1 is receiver, and 2 is data switching networks, and 3 are the information processing main website, and 4 are the network connection.

Embodiment

Further specify the utility model below in conjunction with accompanying drawing by embodiment.

Embodiment 1: anchored object 9kHz-2700MHz radio transmission

Receiver 1 adopts NI PXI-5660, receiver 1 is 3, it is the monitoring aerial of 9kHz-2700MHz that network connects 4 employing receiving antennas, the receiver control computer is NI PXI-8196, cabinet is NI PXI-1042, information processing main website 3 and first receiver 1 computing machine merge, and are about to main website software and are installed on the control computer of first receiver 1.Network connects 4 and adopts the access service of the CDMA of CHINAUNICOM numeral, and data switching networks 2 is the Internet.Above-mentioned parts are connected by mode shown in Figure 1, and the person skilled in art all can smooth implementation.

Embodiment 2: anchored object 2Hz-20kHz sound signal

Receiver 1 adopts NI cRIO-9233, and receiver 1 is 2, and receiving sensor is a PCB1/4 inch microphone, and receiver controller is NI cRIO-9012, and cabinet is cRIO-9104, and information processing main website 3 and first receiver 1 computing machine merge.Data switching networks 2 adopts 802.11 WLAN (wireless local area network), and data switching networks 2 adopts on-air radio to connect.Above-mentioned parts are connected by mode shown in Figure 1, and the person skilled in art all can smooth implementation.

Claims (5)

1. low data traffic difference time of arrival locating device, connect (4) and form by receiver (1), data switching networks (2), information processing main website (3), network, it is characterized in that receiver (1) is the N platform, every receiver connects (4) by network respectively and is connected with data switching networks (2), data switching networks (2) connects (4) link information by network and handles main website (3), wherein, 2≤N≤10000.

2. low data traffic difference time of arrival locating device according to claim 1 is characterized in that network connects (4) and adopts wired or wireless connections.

3. low data traffic difference time of arrival locating device according to claim 1, it is characterized in that data switching networks (2) adopts the Internet, LAN (Local Area Network), computing machine is interconnected or private network in any.

4. low data traffic difference time of arrival locating device according to claim 1 is characterized in that information processing main website (3) adopts the control computer of band receiver.

5. low data traffic difference time of arrival locating device according to claim 1 is characterized in that each receiver (1) is in parallel.

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