Method for determining true speed of watercraft and device for realization of said method

FIELD: measuring equipment engineering.

SUBSTANCE: method includes receipt of signals from external correction means by onboard station, measurement of Doppler frequency shift, determining of true speed on basis of measured Doppler frequency shift, comparison of received values of true speed to values, received on basis of indications of watercraft log, determining lag error. Receipt of signals by onboard station is determined during movement of watercraft along direct destination route, within range of working frequencies 1570-1620 MHz, with frequency of bearing signal 311 MHz, with transformation of received signals to frequencies band 15-65 MHz, with folding of pseudo-random series signal by code of certain navigation spacecraft, after which second intermediate frequency of 420 KHz is received, signal of which bears information about ephemeredes and information about Doppler frequency shift, measurement of which is performed at frequency 3,36 MHz. Determining of lag error is performed using electronic cartographic navigation system, and device for determining true speed has antenna block, connected to receipt indicator, lag and route pointer mating block and electronic cartographic system, while block for mating with lag and route pointer by its inputs-outputs is connected to inputs-outputs of receipt indicator, lag, route pointer and electronic cartographic system, appropriately.

EFFECT: higher precision, higher efficiency.

2 cl, 4 dwg

 

The invention relates to the field of measurements, and more particularly to determination of the standard parameters to obtain the true speed of the vessel during the period of full-scale tests.

Known methods and technical means of obtaining the true rate described in [1-4], include measuring the run length as the shortest distance between two obserwowanie places (observation) of the vessel and the time of passage of this distance, which graphically or analytically calculated speed, the comparison of the obtained values of the true speed with the testimony of the regular ship's velocity meter (lag), a calculation error in determining the true speed.

Known methods of determining the true speed burdened subjective errors of operators performing observations and calculations, require compliance with some specific requirements, which generally leads to an increase in test period. In addition, the known methods is very time consuming and requires significant material costs.

Known methods for determining the true speed of the vessel closest, technical essence, the claimed solution is the method and the device described in [4, s-222]. This method includes the radiation of the master station installed on Board signal continuous radiation, the reception of this signal the Ala slave station, installed on the shore, retransmission of a received signal by a ship station, the measurement of the Doppler shift frequency of this radiation, determining the true speed of the vessel on the measured Doppler frequency shift, and compare the obtained values of the true speed with the values obtained according to the testimony of the regular lag, the definition of the amendment log.

The disadvantages of this method are the need for maneuvering the ship to shore station and from it, as well as averaging of information to obtain acceptable accuracy, which requires the collection of statistical data. Furthermore, the method is carried out only within range of shore-based station.

The objective of the proposed technical solution is the extension of functionality with simultaneous increase of the accuracy of determining the true speed of the vessel when conducting field tests.

This object is achieved in that in the method of determining the true speed of the vessel, including the reception of signals from an external means of correction of the ship station, the measurement of Doppler frequency shift, determining the true speed on the measured Doppler frequency shift, and compare the obtained values of the true speed with the values obtained according to the testimony of the ship lag determination amendments of lag, is where the reception of signals by a ship station is carried out when the vessel for its intended purpose in the operating frequency range 1570-1620 MHz when the frequency of the reference signal 311 MHz and then converting the received signals in bandwidth 15-65 MHz with the convolution of the signal with pseudo-random sequence code specific navigation apparatus, the transform of the signal policystat and receiving the second intermediate frequency 420 KHz, the signal which contains information about the position and information about the Doppler frequency shift, the measurement of which is produced at a frequency 3,36 MHz, definition amendments lag perform via e-map navigation system, and device for determination of the true speed of the vessel containing the antenna unit connected to plementation entered the block mates with a lag and course, and the electronic chart system, and the interface block lag and the course of their inputs and outputs connected to the inputs outputs of diamondcutter, lag, of course, and electronic mapping systems, respectively.

In the proposed method, the reception of signals by a ship station in the operating frequency range 1570-1620 MHz when the frequency of the reference signal 311 MHz and then converting the received signals in the frequency range 15-65 MHz with the convolution of the signal with pseudo-random sequence code specific navigation of the spacecraft, with the transform of the signal policystat and receiving the second intermediate frequency 420 KHz, the signal which contains information about AFAM ridah and information about the Doppler frequency shift, the measurement is made at the frequency 3,36 MHz, which improves the accuracy of the timing measurement of Doppler frequency shift.

When using the proposed method of determining the true speed of the vessel eliminates the need to perform the maneuvering ship to shore station and from it, allowing him when navigating the vessel for its intended purpose.

The combination of the new features of the proposed method of determining the true speed when conducting field tests lags from known sources have been identified that allows to make a conclusion on the compliance of the claimed supply condition of patentability "inventive step".

The method is as follows.

When navigating the vessel for its intended purpose at any point of the World ocean:

- receive antenna signal navigation of spacecraft in the frequency range 1570-1620 MHz, amplify and convert the intermediate frequency signal in the band 15-65 MHz when the reference signal is equal to 311 MHz;

through diamondcutter convert the received signals in the frequency range 15-65 MHz with the convolution of the signal with pseudo-random sequence code specific navigation spacecraft;

- convert the signals policystat and receive the second intermediate frequency 420 KHz, the signal which contains info is the information about the position and information about the Doppler frequency shift;

- measure the amount of Doppler frequency shift in the frequency 3,36 MHz;

- determine the value of the real speed;

- compare the value of the true velocity value velocity obtained by time lag.

Comparing values of the true velocity value velocity obtained by time lag is performed by broadcasting the values of both velocity on e-map navigation system to display these values on an electronic navigation map. Using an electronic token to determine the difference between the readings. Difference calculated form the adjustment value and enter it in the correction pattern ship's log.

On the drawing (figure 1) shows the block diagram ustroystva through which implements the method.

The device has an antenna unit 1, which is connected with plementation 2, which, through the connection unit 3 is connected to the ship's log and course, and e-map navigation system 4.

The antenna unit 1 (figure 2) contains Quadrifilar the antenna 5, the dielectric housing 6, the housing ultrahigh frequency 7, unit cover, ultra high frequency 8, the top of the antenna unit 9.

The antenna 5 is installed on the top cover of the antenna unit 9. Board block ultrahigh frequency is set inside the block ultra high frequency, which contains (3) low noise at elitel 10, the filter 11, the amplifier ultra high frequency 12, a mixer 13, a multiplier 14 and the charge gain of the intermediate frequency 15 consisting of an input of the LPF 16, the intermediate frequency amplifier 17, the separation filter 18 and the amplifier-limiter 19.

Low noise amplifier 10 is made of a two-stage transistors TA-2, each stage of which provides amplification of the signal in the frequency range 1570-1620 MHz to 10 dB.

The filter 11 is made in microstrip design and consists of five resistors. To adjust the amplitude-frequency characteristics of the two trimmer plate of polikor a thickness of 1 mm, the position of which is adjustable filter.

The amplifier ultra high frequency 12 made by balanced scheme on four transistors TA-2. The overall amplification USWC is 20 dB in the range 1570-1620 MHz.

The mixer 13 is made on the basis of microwave microassembly M and converts the signals in the frequency range 1570-1620 MHz, the intermediate frequency signals in Dapsone 15-65 MHz if frequency lo 1555 MHz coming from the Board of multiplier 14, which is made of four transistors TA-2. The first and second transistors amplify and limit signal 311 MHz. The third transistor operates in generator mode harmonics, providing harmonic frequency 311 MHz. The fourth is the transistor operates in the cutoff mode current and enhances all harmonics, received on the third transistor. The selection of the fifth harmonic with frequency 1555 MHz provides trachesotomy microstrip filter located on the same Board as the transistors.

Input filter low frequency 16 is made of three capacitors and two inductors, and has a cutoff frequency of 70 MHz. The intermediate frequency amplifier 17 is made a triple junction in the six transistors in two-wire circuit. The amplifier-limiter 18 is performed on the transistor, and the separation filter 19 is made on the inductor, the capacitor and the resistor.

The antenna unit 1 operates as follows. The signal navigation of spacecraft in the frequency band 1570-1620 MHz, adopted by the antenna, through the output connector of the antenna to the input of the block of ultra-high frequency low noise amplifier 10, which provides amplification of the signal to 20 dB with a noise figure of no more than 4 dB. The amplified signal is supplied to the input of the filter 11, which has a bandwidth of 1570-1620 MHz when the attenuation in the passband is not more than 20 dB.

The parameters of the filter 11 are determined by the amplitude-frequency characteristics high-frequency path. From the output of the filter 11, the signal is fed to the input of the amplifier ultra high frequency 12, which provides amplification of the signal to 20 dB. From the output unit 12, the signal is fed to a mixer 13 where the happening is its transformation into the frequency range 15-65 MHz. To the input of the local oscillator of the mixer 13 receives the frequency 1553 MHz from the output of the multiplier 14. Mode conversion mixer 13 has a gain of minus 9 dB.

From the output of the mixer 13, the signal at the charge amplifier promezhutochnoi frequency 15, where the filtering and signal amplification at 35 dB. For decoupling the power supply, reference frequency and the signal on the circuit Board 15 is selected separation filter 18, which provides the selection frequency reference 311 MHz, which is then transmitted to the amplifier-limiter 19, which passes in the limiting mode when the input level lo input unit ultra high frequency more than 250 mV and ensures normal operation of the antenna unit 1 at short feeder between the antenna unit 1 and plementation 2.

From the output of the amplifier 19 Board of intermediate frequency amplifier 15, the frequency of 311 MHz is supplied to the frequency multiplier 14, which produces an increased frequency of 311 MHz to the required level, limits and allocates the fifth harmonic, equal 1555 MHz.

Receiver equipment 2 (figure 4) consists of two boards synthesizers 20, 21, three channel cards 22, 23 and 24, Board computer 25, the card controller 26, the display Board 27, cards, keyboard 28, the inter-processor interface 29, the control channel receiver 30.

Board synthesizer 20 and 21 are intended to form the heterodyne frequency is high the stability, the gain of the intermediate frequency signal, generating pseudorange samples, formation control bus channel cards, the tracking signal varying in the range of Doppler shift frequencies from 5.0 to minus 5.0 KHz, information processing signal of the navigation of the spacecraft throughout the interval tracking, formation of the label system time.

Board channel 22, 23-24 designed for the convolution of a signal with the synthesizer, a pseudo-random sequence specific to the navigation of the spacecraft, the conversion signal and the second intermediate frequency 420 KHz, containing information about the Doppler shift, the gain at this frequency, the digitized values of Doppler frequency shift, highlight ephemerides information and generate signals to obtain pseudorange.

Fee calculator 25 is designed to receive, store and convert the information received from the boards of synthesizers 20, 21 and boards channel 22, 23 and 24, and the solution to the problem of determining the location, scale, and speed.

The controller Board 26 is used to control the display and keyboard to stop working, to exchange information of these devices with the processor, to generate a sequence of channel NMEA 0183, and calendaring.

Card display 27 p is odnaznachno for visual display of alphanumeric information, coming from the Board computer 25 via controller card 26.

Charge the keyboard 28 is designed to link diamondcutter 2 with the operator.

The connection unit 3 is designed to receive and process information received from the ship's sensors of course (of course) and speed (lag), the delivery of this information through the channel NMEA 0183 on the receiver equipment 2 and e-map navigation system 4, receiving information from the electronic map navigation system and broadcast it on the sensor lag of course.

Electrical communication with the sensor lag and of course through rotary transformers type W-5 and selsyns. The block also contains analogo-digital Converter and the network adapter.

E-map navigation system 4 contains ports I / o, representing two induction serial port RS-323, e-map system type ECS-1000 software d Kart-Navigator and world collection of marine electronic charts in the format of the CM-93.

In General, the device operates as follows.

After running the equipment in the receiver equipment enter the original data (latitude, longitude, height of the antenna above sea level, the speed of the lag and the rate of course) and run the search space navigation app is rata, in this case, if the operational storage device of diamondcutter 2 is stored almanac of navigation spacecraft, the search and the move is made only in the navigation spacecraft, located in the zone of visibility. In the absence of the almanac processor diamondcutter 2 through Board synthesizers recorded in each channel channel cards non navigation of spacecraft systems "NAVSTAR", as well as digital code lettered frequency navigation spacecraft system "GLONASS" and allows search navigation spacecraft range. The adopted antenna signal navigation of spacecraft in the frequency range 1570-1620 MHz is amplified and converted into a signal of intermediate frequency band 15-65 MHz. The intermediate frequency signal from the antenna unit 1 is supplied to charge synthesizer system "NAVSTAR" and served on the Board of the channel and charge synthesizer system "GLONASS". With Board synthesizer system "NAVSTAR" in the antenna amplifier signal of the first heterodyne frequency 311 MHz to produce an intermediate frequency. In channel boards, each channel is convolution of the signal with pseudo-random sequence code specific navigation of the spacecraft, the conversion signal intermediate frequency 420 KHz. This frequency contains the information about ephemeris as well as information about the Doppler frequency shift. To improve the accuracy of the timing measurement of the Doppler frequency shift is performed on the frequency 3,36 MHz, and ephemeridae the information is converted into six-digit code and channel inter-processor interface is transmitted to charge the transmitter together with the value of the Doppler frequency. In addition, the processor is passed an indication of the navigation of a spacecraft on a given channel and a sign of his capture, as well as information about the mismatch of time scales between the onboard time navigation of spacecraft and system time diamondcutter 2.

All information from the channel card system "GLONASS" enters the processor with an interrupt with a frequency of 20 Hz (500 MS), and with a channel card system "NAVSTAR" with a frequency of 10 Hz (100 MS), which are the marks of time and used for the counting of time. Frequencies of 10 and 20 Hz are highly stable and are produced on-Board frequency synthesizer system "GLONASS", by dividing the reference frequency of 1 KHz.

In addition, each channel on the Board synthesizer system "NAVSTAR" comes clocked pseudorandom sequence code and signal the beginning of the code sequence is "age" of the code.

Located on fee synthesizer system "NAVSTAR" rangefinder times per second is connected to each of Canalou information clock code and the "age" of the code produces the pseudo-random measurement range to the navigation of the spacecraft. The provision of information in the processor is in interrupt with a frequency of 10 Hz.

Information cards with synths and channel cards, quickly accumulates in a storage device located on the motherboard of the computer. Further data processing is performed under control of programs, making the calculation of the navigation task in obtaining information about the current position, speed and track angle. The results of solving the navigation task and speed values on the lag, and inter-processor interface, with the processor through a controller card received on the serial port of the electronic map navigation system 4, and which it is displayed on marine navigation electronic map corresponding to the navigation area. Via e-token determine the difference between the readings of the ship lag and indications satellite navigation system and the resulting amendment of speed through the block 3 is broadcast on correcting device lag.

In the proposed method, the reception of signals from the ship's satellite navigation station perform when the vessel for its intended purpose, and their subsequent processing in a particular p is the row, using information from space navigation vehicles and staff of ship navigation through the device, complexional of the staff of the ship means that allows to make a conclusion on the compliance of the claimed supply condition of patentability "industrial applicability".

The advantage of the proposed method and device for its implementation, in comparison with known objects, is to improve the accuracy, due to the exclusion of subjective errors, reducing the complexity of performing calibration operations during full-scale tests lags, since the calibration work is performed only using the standard ship assets, without using information from the coastal navigation AIDS, eliminating the need to perform complex maneuvering of the vessel and allows you to implement a method for navigation of a vessel for its intended purpose. The proposed method can also be used when conducting tests to determine the manoeuvring elements of ships and other moving objects.

Sources of information

1. Auerbach N.V. Baranov, J.K. Definition of flexible elements of the marine vessel and amendments lag. M, Transport, 1970.

2. Popeko G.P., Solomatin E.N. Navigation in the book. The course of navigation, vol. 1. L., EGS Navy, 1961.

3. Fat'yanov A.I. Practical guide to Wyvern and determination amendments of navigation devices on ships. M, Transport, 1976.

4. Marine velocimeter (Directory) / Ranges A.A., the way V.N., Aswhin B.A., Vinogradov K.A., Chernivets VV // HP, Shipbuilding, 1978, s-222.

1. The method of determining the true speed of the vessel, which consists in taking a ship station of signals from navigation of spacecraft in the frequency range 1570-1620 MHz, convolution of the signal with pseudo-random sequence code specific navigation apparatus, the measurement of Doppler frequency shift, which determine the true speed of the vessel, the comparison of the obtained values of the true speed with the values obtained according to the testimony of the ship lag, and the definition amendments lag, characterized in that the signal is performed when the vessel for its intended purpose when the frequency of the reference signal 311 MHz received signal to its convolution transform in the signal, the first intermediate frequency in the band 15-65 MHz, after convolution receive the second intermediate frequency of 420 MHz, a signal which contains information about the ephemeris and the Doppler frequency shift, the measurement is made at the frequency 3,36 MHz, and the amendment of the lag is determined using an electronic navigation chart systems, which are electronic map system software and world collection of e-cards.

2. The device is the distribution of the true speed of the vessel, containing the antenna unit connected to plementation, which, through the connection unit, used for receiving and processing information from the ship's log and of course, and the delivery of this information to the receiver equipment connected to the ship's log and the navigation lightbar, characterized in that the device entered e-map navigation system, containing ports of I / o electronic map system software and world collection of marine electronic charts, which through the connection unit receives information from the lag and of course, the connection unit receives information from the electronic map navigation system and transmits it to the sensor lag and of course, the information processor diamondcutter through his controller on port electronic mapping system.



 

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FIELD: measuring equipment engineering.

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EFFECT: higher precision, higher efficiency.

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FIELD: physics.

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