Recirculation correlator of resolution of phase-code manipulated signals

FIELD: radio engineering, possible use in radiolocation stations for allowing phase-code manipulated signals with approximately equal frequencies.

SUBSTANCE: input signal of device is an additive mixture of video-frequency phase-code manipulated signals with varying amplitudes and delays, encoded by M-series, digitized with temp in two counts on elementary analog quantization step in strobe M=4·n-1. By means of first adder and first shift register input signal by its recirculation amounts to interval, equal to 2·n. By means of first commutator signal is divided on even and odd series, which in turns pass to block of cross connections, then to block of fast Walsh transformation, and further to block of reverse check connections and second commutator. From the latter signals are sent to block for synchronization with elementary quantization step two counts long. Further signals are sent to third commutator, which in accordance to its evenness and oddness order sends them to second adder. By means of second adder and second shift register, signal from third commutator by its recirculation amounts to interval, equal to 2·n.

EFFECT: substantially decreased computer power costs due to recirculation transformation of input signals, making it possible to apply fast Walsh transformation.

3 cl, 8 cl

 

The invention relates to electrical engineering and can be used in radar stations to resolve visokomolekulyarnih (FCM) signals with approximately equal frequency.

Known correlator resolution of signals in time delay that contains one United block fast Fourier transform (FFT), the multiplier (functionally - divisor), the block of the inverse fast Fourier transform (OBPF), and the input device is the input of the FFT block, to the second input of the multiplier signal, having a structure of a diagonal matrix whose elements are the inverse of the discrete spectrum of the reference oscillation, the output device is output block OBPF [1].

However, the known correlator resolution has a relatively large computational cost due to the multiplier (functionally - divider) multi-digit numbers and two corresponding FFT.

The aim of the invention is the simplification of the circuit of the correlator resolution of signals in time delay, leading to a significant reduction of the computational cost due to the recirculation of conversion of input signals in order to apply the fast Walsh transform (MCR).

Figure 1 shows the structural diagram of the proposed recirculation correlator permission; figure 2 - structural diagram BL is 8 ka coordination with the elementary increments in the duration of two reference; figure 3 - building M-circulant and its conversion to semielemental M-sequence with the purpose of explanation building block 4 cross-connections and block 6 reverse cross-links; figure 4 is a plot illustrating the recirculation correlator permissions for the case of processing two FCM signals encoded semielemental M-sequence (n=7), discretized with a rate of two samples on a basic analog discretes (k=2) and delayed relative to each other six times in the gate of the N=2·n·k-1=27 times.

The device comprises a first adder 1, the first shift register 2, the first switch 3, block 4 cross-connections, unit 5 MCR, block 6 reverse cross-links, the second switch 7, block 8 coordination with elementary discrete duration in two counts, the third switch 9, the second adder 10, the second register 11 shift (figure 1).

Unit 8 coordination with elementary discrete duration in two reference contains the first and second registers 12 of the shift, the first and second registers 13 shifts by one count, the first and second adders 14 (figure 2.).

The first adder 1 contains two inputs and one output, the first input is the input device, the second input is connected to the last output of the first shift register 2, the output connected to the input of the first register 2 offset.

The first shift register 2 which contains one input, 2·n outputs, 2·n r-bit cells (r - the number depending on the bitness of the ADC), the outputs connected to respective inputs of the first switch 3.

The first switch 3 is designed for separation of output values of the first shift register 2 and contains 2·n inputs and n outputs, the outputs connected to respective inputs of block 4 cross-connections.

Block 4 contains cross-links n inputs and n outputs, the outputs connected to respective inputs of unit 5 MCR, and regard themselves must be constructed so that during the mixing of the input FCM signal, the encoded M-sequence carried out by the procedure of recycling, gate 4·n-1 to interval 2·n, the output values of the block of cross-connections coincided with one of the matrix rows of the Walsh-Hadamard transform (without the first row and first column): for example, for semielemental M-sequence 1110100, forming the polynomial x3+x+1, is constructed M-circulant so that the first line of the M-circulant contained the original M-sequence, and subsequent lines were built by the cyclic shift by one element to the right (Fig 3, a). Next numbered columns of the received M-circulant from left to right (figa bottom row). Then the first l rows, where l=3 - degree generating polynomial of the M-sequence, and the selected value is I in the columns are translated into the decimal system, considering the upper value of the low discharge (figa top row). These numbers will determine crosstalk, that is, the first input of the cross-ties will be connected to the first output of this block, the second with the sixth, the third with the second, fourth to seventh, fifth, fifth, sixth, fourth, and seventh to the third.

Unit 5 MCR contains n inputs and n outputs, the outputs connected to respective inputs of block 6 reverse cross-links. Fast Walsh transform is based on the well-known factorization algorithm hood [2]:

where Yn+1- vector of size n+1 that represents the data after conversion;

matrix cofactors, composed of l components;

E2elementary matrix of the Walsh function of size two by two;

I2is the identity matrix of size two by two;

⊗ is the Kronecker symbol works;

Xn+1- vector of size n+1 that represent the original data.

Unit 5 MCR is designed to compute the vector Ynthat does not use the first row and first column of the matrix of Walsh-Hadamard transform.

Unit 6 reverse cross-links contains n inputs and n outputs, the outputs connected to respective input the AMI of the second switch 7, and they relationships are defined by the rule: the columns of the matrix (figa) are assigned sequence numbers (figa top row), then these columns are built in ascending order of their numbers; numbered rows and records the values of the elements of the matrix in the signal, that is, zero is equivalent to "+", and the unit is equivalent to "-" (figb). Now, if in the present example, the third and fourth lines are interchanged, and instead of the fifth row to put the seventh, sixth, fifth, seventh, sixth, add the top row and left column of zeros, then we obtain a canonical matrix of Walsh-Hadamard transform of size eight by eight (pigv). These changes will make the building of cross-connections, that is, the first input unit 5 reverse cross-links will be connected to the first output of this block, the second with the second, the third with the fourth, the fourth to the third, fifth to seventh, sixth, fifth, and seventh - sixth.

The second switch 7 includes n inputs and two outputs, the outputs connected to respective inputs of the block 8 coordination with elementary discrete duration two count.

Unit 8 coordination with elementary discrete duration in two reference contains two inputs and two outputs, the outputs of the block are connected to the corresponding inputs of the third switch 9.

The third switch 9 contains on the and of the inputs and one output, the output is connected to the first input of the second adder 10.

The second adder 10 has two inputs and one output, the second input is connected to the last output of the second register 11 of the shift, the output connected to the input of the second register 11 shift.

Second register shift has one input, 2·n outputs and 2·n cells corresponding to the bit, the outputs of the second register 11 shift are the outputs of the device.

The elements included in the block 8 coordination with elementary discrete duration in two countdown, connected in the following order: first and second registers 12 shift this block contains one input and one output, n r-bit cells, the input registers are input block, the output of the first shift register 12 is connected to the input of the first register 13 shift by one sample and with the input of the second adder 14, and the output of the second shift register 12 is connected to the input of the second register 13 shifts by one count and to the input of the first adder 14; first and second registers 13 shift one sample contains one input, one output and one r-bit cell, the output of the first register 13 shift by one sample is connected to the input of the first adder 14, the output of the second register 13 shift by one sample is connected to the input of the second adder 14; first and second adders 14 contain two inputs and one output, the outputs of the adders 14 you are what od unit 8 coordination with elementary discrete duration two count.

The proposed device is considered for the case of processing additive mixture of two videocasting FCM signals encoded semielemental M-sequence-1-1-11-111, discretized with a rate of two samples on a basic analog discretes k=2, different amplitude and delayed relative to each other on six counts, n=7, gate M=2·n·k-1=27 (figa). In the initial state in the cells of the registers 2, 12, 13, 11 shift recorded zeros.

The input of the first adder 1 receive timing input signal and being summarized in the course zero value of the last cell of the first shift register 2 is fed to the input of the first register 2 shift. The summation of the zero value of the last cell of the first shift register 2 in the first adder 1 is up until the first shift register 2 is written first fourteen values of samples of the input signal. Following the beat of the reference value in the last cell of the first register 2 offset added in the first adder 1 from the fifteenth to the value of the reference input signal and is recorded in the first cell of the first register 2 shift. Thus, the entire input signal is placed in the first register 2 shift (figb). After that, the recorded values in the first register 2 shift from the first to the fourteenth cell, proceed to the appropriate inputs of the first switch 3 is de first input unit 4 cross-connections are transmitted values of the odd-numbered cells of the first register 2 shift. With outputs of block 4 cross-links these values to arrive at unit 5 MCR, where it calculates the vector Y7for this sequence.

The output signal of unit 5 MCR is supplied to corresponding inputs of a block 6 reverse cross-links and then to the second switch 7 through the first output alternately placed in the first register 12 shift unit 8 coordination with elementary discrete duration two count. Then the first switch 3 takes values of even-numbered cells of the first register 2 shift, passes them to the appropriate inputs of the unit 4 is a cross-ties. With outputs of block 4 cross-links these values to arrive at unit 5 MCR, where it calculates the vector Y7for this sequence. The output signal of unit 5 MCR is supplied to corresponding inputs of a block 6 reverse cross-links and then to the second switch 7 through the second output alternately placed in the second register 12 shift unit 8 coordination with elementary discrete duration two count.

In block 8 of the agreement with the elementary increments in the duration of two reference signals from the outputs of the first and second registers 12 shift in the order of his odd and parity in turn fed to the input of the first and second register 13 shifts by one count, respectively, where delayed by one sample, and the first inputs Vtorov the first and adders 14, respectively, where are summed with the corresponding delayed data samples. At this time, the third switch 9 in the order of odd parity and parity in turn relieves the values obtained from outputs of the first and second adders 14 block 8 coordination with the elementary increments in the duration of two frames and transmits them to the first input of the second adder 10, where, being summarized in the course of the last value of the second register 11 shift, arrive at the input of the second register 11 shift.

The output signal of the device is removed from the outputs of the second register 11 shift. The peculiarity of the output signal of the device is single level and uniform nature of the correlation noise (pigv).

Analysis of the known and proposed device shows that for the calculation of the two FFT in the known device requires 2·n·log2n operations of multiplication of complex numbers and n multiplication (divisions) in the multiplier (functionally - divider), and in the proposed device, due to the MCR, you want to calculate n·log2n algebraic operations on complex numbers of typethereby significantly increasing the performance of the proposed device.

Literature

1. V.k.sloka, Geekaren. Algorithms of signals in digital processing. - M.: the USSR Academy of Sciences, RTI, Preprint 848, 1984

2. Amirhan, Whatman fundamentals of theory of discrete signals on finite intervals. - M.: Owls. radio, 1975.

1. Recirculation correlator resolution visokomolekulyarnih (FCM) signal contains the first and the second adder, the first and second shift registers, the first, second and third switches, the unit of cross-connections, the unit is fast Walsh transform, block reverse cross-links, the block matching with elementary discrete duration two count, and the input device is a first input of the first adder, and the output device are the outputs of the second shift register, the second input of the first adder is connected to the last output of the first shift register, the output of the first adder connected to the input of the first shift register, 2·n outputs which is connected to the corresponding inputs of the first switch, the n outputs of which are connected to the corresponding inputs of the block cross-links, n outputs which are connected to the corresponding inputs of the block fast Walsh transform, n outputs which are connected to the corresponding inputs of the block reverse cross-links, n outputs which are connected to the corresponding inputs of the second switch, the two outputs of which are connected to corresponding inputs of block coordination with elementary discrete duration in two counts, two outputs which are connected to the corresponding inputs of the third to the mutator, which in turn is connected to the first input of the second adder, the output of which is connected to the input of the second shift register, the last output of the second shift register connected to the second input of the second adder.

2. Recirculation of the correlator according to claim 1, characterized in that the block matching with the elementary increments in the duration of two reference contains the first and second shift registers, inputs of which are the inputs of the specified block, the first and second shift registers one count, the first and second adders, the outputs of which are outputs of the specified block, the output of the first shift register connected to the input of the first shift register by one count and the first input of the second adder and the output of the second shift register connected to the input of the second shift register by one count and the first input of the first adder, the outputs of the first and second shift registers for one countdown respectively connected with the second inputs of the first and second adders.

3. Recirculation of the correlator according to claim 1, characterized in that it comprises a unit cross-links, which contains cross-links, which should be constructed so that during the mixing of the input FCM signal, the encoded M-sequence carried out by the procedure of recycling, gate 4·n-1 times in the interval 2· n times, the output values of the block of cross-connections coincided with one of the matrix rows of the Walsh-Hadamard transform, which is the first row and the first column.



 

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