RU161877U1 - COAGER RADIO SIGNAL DETECTOR-METER - Google Patents

Abstract

Coherent radio signal detector-meter, comprising a delay unit, a complex conjugation unit, a complex multiplication unit, an averaging unit, a phase calculation unit, a measurement range correction unit, a multiplier, a key, a first memory unit, a control unit, a module calculation unit, a threshold unit, a second unit memory and a clock generator, while the outputs of the delay unit are connected to the inputs of the complex conjugation unit, the outputs of which are connected to the first inputs of the complex multiplication unit, the second inputs of which are combined with the inputs and a delay block, the output of the first memory block is connected to the first input of the multiplier, the output of which is connected to the key input, the output of the threshold block is connected to the control input of the key, the first input of the threshold block is connected to the output of the second memory block, the output of the clock generator is connected to the sync inputs of the delay block, block complex conjugation, complex multiplication block, averaging block, phase calculation block, multiplier, key, module calculation block, first and second memory blocks, block for correction of measurement limits and threshold unit, characterized in that the first and second two-channel keys, an additional averaging unit, an additional delay unit, an additional complex conjugation unit and an additional complex multiplication unit are introduced, while the outputs of the complex multiplication unit are connected to the combined inputs of the first and second two-channel keys, the control inputs of which connected respectively to the first and second outputs of the control unit, the outputs of the first two-channel key are connected to the inputs of the averaging unit, the outputs of which are connected inens with inputs

Description

The device relates to radar and is designed to detect non-equidistant coherent radio signals and measure the radial speed of a moving object; can be used in air traffic control radar systems to detect and measure the speed of aircraft.

Known multi-channel non-tracking filter meter [1], each channel of which contains a matched filter and detector connected in series, the outputs of the channels are combined by a resolver. However, this device has low detection efficiency and measurement accuracy, as well as the complexity of implementing multi-channel processing.

Also known is a radar device for detecting a moving target [2], containing sequentially included delay blocks, a complex number multiplier and a subtractor. However, this device has low accuracy and ambiguity of measurement.

Closest to the claimed device is a Doppler signal detector-meter [3], selected as a prototype, comprising a delay unit, a complex conjugation unit, a complex multiplication unit, an averaging unit, a phase calculation unit, a multiplier, a key, a module calculation unit, a first memory unit , a control unit, a threshold unit, a second memory unit, and a clock generator. However, this device has ambiguity and low measurement accuracy due to the presence of a large number of functional transformations associated with signal processing using wobble of the repetition period.

The problem to be solved in the claimed device is to expand the range of unambiguously measured radial velocities and increase the accuracy of the measurement due to fewer functional transformations in the joint processing of non-equidistant coherent radio signals.

To solve the problem in a coherent radio signal detector-meter, comprising a delay unit, a complex conjugation unit, a complex multiplication unit, an averaging unit, a phase calculation unit, a measurement limit correction unit, a multiplier, a key, a first memory unit, a module calculation unit, a control unit, the threshold unit, the second memory unit and the clock generator, the first and second dual-channel keys, an additional averaging unit, an additional delay unit, an additional complex pairing unit are introduced and will complement flax complex multiplication unit.

Additional blocks introduced into the proposed device are known. So, the delay block, the complex conjugation block, and the complex multiplication block connected together allow one to isolate the Doppler phase incursion for the interval between adjacent pulses. However, the joint use of the delay unit, the complex conjugation unit, the complex multiplication unit, the first and second two-channel keys, the control unit, the additional delay unit, the additional complex conjugation unit, the additional complex multiplication unit is not known. The connections of the first and second two-channel keys with the complex multiplication unit and the control unit, the averaging unit with the first two-channel key and the additional delay unit, the additional averaging unit with the second two-channel key and the additional complex conjugation unit, the additional complex multiplication unit with the additional delay unit are new and an additional complex conjugation unit, an additional complex multiplication unit with a phase calculation unit, a limit correction unit Measurements and calculations of the module unit, the module further calculation unit and the threshold unit, the connection between the timing generator and all units coherent detector-meter radio nonequidistant provide coherent processing sequence signals.

The technical result provided by the given set of features is to expand the range of unambiguously measured radial velocities and increase the measurement accuracy.

The claimed solution is technical in nature, feasible, reproducible and, therefore, is industrially applicable.

In FIG. 1 is a structural electrical diagram of a detector-meter for coherent radio signals; in FIG. 2 - delay unit; in FIG. 3 - block complex conjugation; in FIG. 4 - block complex multiplication; in FIG. 5 - averaging unit; in FIG. 6 - phase calculation unit; in FIG. 7 - block correction limits of measurement; in FIG. 8 - character assignment unit; in FIG. 9 - module calculation unit, in FIG. 10 - two-channel key; in FIG. 11 - control unit.

The coherent radio signal detector-meter (Fig. 1) contains a delay unit 1, complex conjugation unit 2, complex multiplication unit 3, averaging unit 4, phase calculation unit 5, measurement limits correction unit 6, multiplier 7, key 8, first memory unit 9 , control unit 10, module calculation unit 11, threshold unit 12, second memory unit 13, clock 14, first two-channel key 15, second two-channel key 16, additional averaging unit 17, additional delay unit 18, additional complex pairing unit 19 and additional an integral complex multiplication unit 20, while the outputs of the delay unit 1 are connected to the inputs of the complex conjugation unit 2, the outputs of which are connected to the first inputs of the complex multiplication unit 3, the second inputs of which are combined with the inputs of the delay unit 1, the output of the first memory unit 9 is connected to the first input a multiplier 7, the output of which is connected to the input of the key 8, the output of the threshold block 12 is connected to the control input of the key 8, the first input of the threshold block 12 is connected to the output of the second memory block 13, the outputs of the complex multiplication block 3 connected to the combined inputs of the first 15 and second 16 two-channel keys, the control inputs of which are connected respectively to the first and second outputs of the control unit 10, the outputs of the first two-channel key 15 are connected to the inputs of the averaging unit 4, the outputs of which are connected to the inputs of the additional delay unit 18, the outputs of the second the two-channel key 16 is connected to the inputs of the additional block 17 averaging, the outputs of which are connected to the inputs of the additional block 19 complex pairing, the outputs of the additional block 18 LCDs are connected to the first inputs of the additional complex multiplication unit 20, the second inputs of which are connected to the outputs of the additional complex conjugation unit 19, the outputs of the complex multiplication unit 20 are connected to the combined inputs of the phase calculation unit 5, the second and third inputs of the measurement limits correction unit 6, and the calculation unit 11 module, the output of block 11 calculating the module is connected to the second input of the threshold block 12, the output of block 6 correction of the limits of measurement is connected to the second input of the multiplier 7, the output of the clock RA 14 is connected to the clock inputs of the delay unit 1, complex conjugation unit 2, complex multiplication unit 3, averaging unit 4, phase calculation unit 5, measurement limits correction unit 6, multiplier 7, key 8, first memory unit 9, module calculation unit 11, the threshold unit 12, the second memory unit 13, the first 15 and second 16 dual-channel keys, the additional averaging unit 17, the additional delay unit 18, the additional complex conjugation unit 19, the additional complex multiplication unit 20, and find the inputs For the meter of coherent radio signals are the inputs of delay unit 1, and the first and second outputs are the output of key 8 and the output of threshold block 12, respectively.

The delay unit 1 and the additional delay unit 18 (Fig. 2) contain two digital delay lines 21, the inputs of the delay units are the inputs of the digital lines 21, the outputs of which are the outputs of the delay units.

The complex conjugation unit 2 and the additional complex conjugation unit 19 (Fig. 3) comprise an inverter 22, the first input of the complex conjugation block is its first output, the second input is the inverter input, the output of which is the second output of the complex conjugation block.

The complex multiplication block 3 and the additional complex multiplication block 20 (Fig. 4) contain two channels (I, II), each of which includes the first multiplier 23, the second multiplier 24 and the adder 25 connected in series, the output of the first multiplier 23 of one channel is connected to the second the input of the adder 25 of the other channel, and the first and second inputs of the complex multiplication block, respectively, are the combined first inputs of the first and second multipliers 23, 24 of each channel, the combined second inputs of the first Ithel 23 and the combined second inputs of the second multipliers 24 and the output unit are complex multiplication outputs of adders 25 of each of the channels.

Block 4 averaging and additional block 17 averaging (Fig. 5) contain two channels (I, II), each of which consists of (N-3) / 2 series-connected digital delay lines 26 and (N-3) / 2 series-connected adders 27, the inputs of the averaging block are the combined inputs of the first delay line 26 and the first adder 27 of each channel (I, II), and the output of the k-th [k = 1 ... (N-3) / 2] delay line 26 is connected to the second input of the k-th [k = 1 ... (N-3) / 2)] adder 27 of each channel (I, II), the outputs of the averaging block are the outputs of the [(N-3) / 2] -th adders 27.

The phase calculation unit 5 (Fig. 6) contains a series divider 28 and a functional converter 29, the inputs of the phase calculator are the inputs of the divider 28, and the output of the phase converter 29 is the output of the functional converter 29.

Block 6 correction of the limits of measurement (Fig. 7) contains sequentially connected modular block 30, the adder 31, the block 32 of the assignment of the sign, the first key 33 and the adder 34, while the first input of the block 6 correction of the limits of measurement through the second key 35 is connected to the second input of the adder 34, the output of the memory unit 36 is connected to the second input of the adder 31, the second input of the measurement range correction unit is connected to the control inputs of the first 33 and second 35 keys, the second input of the character assignment unit 32 is the third input of the measurement range correction unit, course of the adder 34 is its output.

The character assignment unit 32 (FIG. 8) contains multiplication units 37, 40, a memory unit 38 and a limiter 39, the second input of the character assignment unit being the first input of the multiplication unit 37, the second input of which is connected to the output of the memory unit 38, the output of the multiplication unit 37 connected to the input of the limiter 39, the output of which is connected to the first input of the multiplication unit 40, the second input of which is the first input of the character assignment unit, the output of the character assignment unit is the output of the multiplication unit 40.

The module calculation unit 11 (Fig. 9) contains two multiplication units 41, an adder 42 and a square root extraction unit 43, the inputs of the module calculation unit are the inputs of the multiplication units 41, the outputs of which are connected to the first and second inputs of the adder 42, the output of which is connected to the input a square root extraction unit 43, the output of which is the output of a module calculation unit.

The first 15 and second 16 two-channel keys (Fig. 10) contain two keys 44, the inputs of the two-channel keys are the inputs of the keys 44, the outputs of which are the outputs of the two-channel keys.

The control unit 10 (Fig. 11) contains a trigger 45 and an element HE 46, the input of the control unit is the input of the trigger 45, the output of which is connected to the input of the element HE 46, the first output of the control unit 10 is the output of the trigger 45, and the second output is the output of the element NOT 46.

The detector-meter coherent radio signals operates as follows.

In the inventive detector-meter is processed non-equidistant coherent-pulse sequence of N radio signals with alternating repetition periods T ₁ and T ₂ , and T ₁ -T ₂ = ΔT. When radio signals are reflected from a moving target, their carrier frequencies in the corresponding periods acquire Doppler phase shifts

- доплеровская частота, ν_r - радиальная скорость цели,

- несущая частота радиосигналов, с - скорость распространения радиоволн.Where

is the Doppler frequency, ν _r is the radial velocity of the target,

- carrier frequency of radio signals, s - propagation velocity of radio waves.

The radio signals reflected from the target are fed to the input of the receiver, in which they are amplified, are transferred to the video frequency in quadrature phase detectors, and then undergo analog-to-digital conversion (the corresponding blocks in Fig. 1 are not shown). At the input of the detector-meter in one element of range resolution, digital readings of the complex envelope are received

where u _1k , u _2k are the digital codes of the real and imaginary parts of the samples U _k .

. Далее в блоке 3 комплексного умножения (фиг. 4) реализуется попарное умножение отсчетов в соответствии с алгоритмомThe input samples U _{k of the} detector-meter (Fig. 1) in the delay unit 1 (Fig. 2) under the control of the synchronizing pulses generated by the sync generator 14 are alternately delayed by the intervals T ₁ and T ₂ , which ensures synchronization of the subsequent complex multiplication of the samples in range. The sync generator 14 is controlled by the pulses of the radar synchronizer (not shown in Fig. 1), following alternately at intervals T ₁ and T ₂ . In block 2 complex pairing (Fig. 3) is a complex pairing of the delayed reference

. Further, in block 3 of complex multiplication (Fig. 4), pairwise multiplication of samples is implemented in accordance with the algorithm

раздельно для каждого интервала T₁ и Т₂ соответственно через первый 15 и второй 16 двухканальные ключи раздельно поступают в блок 4 усреднения и в дополнительный блок 17 усреднения (фиг. 5). Поочередная коммутация первого 15 и второго 16 двухканального ключей осуществляется импульсами соответственно с первого и второго выходов блока 10 управления, синхронизируемого также импульсами синхронизатора радиолокатора.Pairwise Products

separately for each interval T ₁ and T _2, respectively, through the first 15 and second 16 two-channel keys are separately received in block averaging 4 and in an additional block 17 averaging (Fig. 5). Alternate switching of the first 15 and second 16 two-channel keys is carried out by pulses, respectively, from the first and second outputs of the control unit 10, synchronized also by the pulses of the radar synchronizer.

In block 4 averaging (Fig. 5) using delay lines 26 for the interval T ₁ + T ₂ and adders 27 in each element of the resolution in range, a coherent summation (accumulation) _{of the} pairwise products corresponding to the interval T _{1 is} performed along the azimuth, which leads to the formation of at the output of averaging block 4 with an odd N value

In the additional averaging block 17 (Fig. 5), a similar summation _{of the} pairwise products corresponding to the interval T _{2 is} carried out, which leads to the formation at its output of a value

The value of Y ₁ at the output of the averaging unit 4 (FIG. 5) in time precedes the value of Y ₂ by the interval T ₂ , which is compensated by the corresponding delay Y ₁ in the additional delay unit 18 (FIG. 2). In the additional block 19 complex conjugation (Fig. 3) the sign of the imaginary part of the value Y _{2 is} inverted.

одновременно поступают соответственно на первые и вторые входы дополнительного блока 20 комплексного умножения (фиг. 4), на выходе которого вычисляется величинаValues Y ₁ and

simultaneously arrive, respectively, at the first and second inputs of the additional complex multiplication unit 20 (Fig. 4), at the output of which the value is calculated

Values ν ₁ and ν ₂ are connected to respective inputs of phase calculation unit 5 (Fig. 6), wherein on the basis of the division unit 28 and the inverter 29 calculated functional assessment

происходят в блоке 6 коррекции пределов измерения (фиг. 7) и зависят от знака ν₁. При ν₁>0 открыт второй ключ 35, и оценка

через сумматор 34 непосредственно поступает на выход блока коррекции пределов измерения. При ν₁<0 открыт первый ключ 33, а второй ключ 35 закрыт. При этом в модульном блоке 30 образуется |argV|, вычитаемый в блоке 31 из величины π, поступающей от блока 36 памяти. Полученной разности в блоке 32 присваивается знак величины ν₂.Subsequent Assessment Conversions

occur in block 6 correction of the limits of measurement (Fig. 7) and depend on the sign of ν ₁ . For ν ₁ > 0, the second key 35 is open, and the estimate

through the adder 34 directly enters the output of the correction unit of the measurement limits. When ν ₁ <0, the first key 33 is open, and the second key 35 is closed. In this case, | argV | is formed in the modular block 30, subtracted in block 31 from the value of π coming from the memory block 36. The resulting difference in the block 32 is assigned the sign of ν _2.

Block 32 character assignment (Fig. 8) works as follows. The value ν ₂ [relation (1)] is supplied to the second input of the sign-assigning unit, where in the multiplication unit 37 it is multiplied by a constant factor from the memory unit 38 in order to scale and further limit the limiter 39 to a level of ± 1. Thus, after the restriction, the value at the output of the limiter 39 has the meaning of a sign of the quantity ν ₂ , which, arriving at the first input of the multiplication block 40, is assigned the difference π- | argV | coming from the output of block 31 to the first input of the sign-assigning block 32, t. e. to the second input of the multiplication block 40.

The operations considered allow, in block 5 of the phase calculation, first to find an estimate of the Doppler phase shift located in the interval [-π / 2, π / 2], and then using block 6 to correct the measurement limits, expand the limits of its unambiguous measurement to the interval [-π, π ] according to the algorithm

на коэффициент а, хранящийся в первом блоке 9 памяти, что позволяет найти однозначную оценку радиальной скорости в соответствии с выражениемThe multiplier 7 (Fig. 1) multiplies the found phase shift estimate

by a coefficient a stored in the first memory block 9, which allows one to find an unambiguous estimate of the radial velocity in accordance with the expression

- весовой коэффициент.Where

- weight coefficient.

To reduce the likelihood of the device working by noise, it excludes the issuance of the obtained estimate for output in the absence of a signal reflected from the target. In block 11, the calculation of the module (Fig. 9) calculates the value

which is supplied to the second input of the threshold block 12, which compares with the threshold level z ₀ recorded in the second memory block 13. If the threshold level z ₀ is exceeded, then the output of the threshold block 12 receives a permission signal for passing the calculation result from the output of the multiplication block 7 through the key 8 to the first output of the coherent radio signals detector-meter. Otherwise, key 8 is open. In addition, the signal from the second output of the threshold block 12, which is the second output of the detector-meter of coherent radio signals, can be used to read other coordinates of the target, for example range.

The synchronization of the detector-meter of coherent radio signals is carried out by applying to all blocks of the claimed device a sequence of synchronizing pulses generated by the synchronizer 14 (Fig. 1) with a repetition period t _K determined from the condition of the required resolution in range.

и с учетом

с для максимально возможной скорости цели ν_{r max} выбрать интервал ΔT≤c/4ν_{r max}

, то во всем диапазоне реальных скоростей цели может быть осуществлено их однозначное измерение. При этом сохраняется однозначность измерения дальности, которая обеспечивается соответствующим выбором меньшего периода повторения импульсов Т₂.In the known device (prototype), the initial Doppler phase shifts φ ₁ and φ ₂ , by which the value Δφ = φ ₁ -φ _{2 is} calculated, have an unambiguous measurement interval [-π, π], which corresponds to an unambiguous measurement interval of the Doppler frequency [-1 / 2T ₁ , 1 / 2T ₁ ] (the largest period is T ₁ ). In the proposed device, the value Δφ is measured directly, which corresponds to the interval of uniqueness of the Doppler frequencies [-1 / 2ΔT, 1 / 2ΔT]. In this case, the interval of unambiguous measurement of the Doppler frequency and, consequently, the radial velocity expands by T ₁ / ΔT times, which corresponds to the solution of the problem of the utility model. If in accordance with the condition

and given

s for the maximum possible target speed ν _{r max} select the interval ΔT≤c / 4ν _{r max}

, then in the entire range of real target speeds, their unambiguous measurement can be carried out. This preserves the uniqueness of the range measurement, which is ensured by the appropriate choice of a smaller pulse repetition period T ₂ .

The errors of the separate calculation of the quantities φ ₁ and φ ₂ caused by functional transformations are statistically independent. As a result, the error (dispersion) of the difference φ ₁ -φ ₂ = Δφ is doubled. In the proposed device, when directly calculating the Δφ value, such a doubling is absent, which corresponds to an increase in the measurement accuracy.

Thus, the detector-meter of coherent radio signals allows you to expand the range of unambiguously measured radial velocities and improve measurement accuracy due to the smaller number of functional transformations when using the proposed joint processing of non-equidistant coherent radio signals.

Bibliography

1. Shirman Y.D. and Manzhos V.N. The theory and technique of processing radar information against the background of interference. - M .: Radio and communication. - 1981. - S. 204. - Fig. 14.2.

2. Patent No. 63-49193 (Japan), IPC G01S 13/52. Radar device for detecting a moving target / K.K. Toshiba. Publ. 10/03/1988. - Inventions of the countries of the world. - 1989. - Issue 109. - No. 15. - S. 52.

3. Patent No. 2017167 (Russia), IPC G01S 13/58. Detector-meter of Doppler signals / D.I. Popov, S.V. Gerasimov and E.N. Mataev. Publ. 07/30/1994. - Inventions. - 1994. - No. 14. - S. 121.

Claims (1)

Coherent radio signal detector-meter, comprising a delay unit, a complex conjugation unit, a complex multiplication unit, an averaging unit, a phase calculation unit, a measurement range correction unit, a multiplier, a key, a first memory unit, a control unit, a module calculation unit, a threshold unit, a second unit memory and a clock generator, while the outputs of the delay unit are connected to the inputs of the complex conjugation unit, the outputs of which are connected to the first inputs of the complex multiplication unit, the second inputs of which are combined with the inputs and a delay block, the output of the first memory block is connected to the first input of the multiplier, the output of which is connected to the key input, the output of the threshold block is connected to the control input of the key, the first input of the threshold block is connected to the output of the second memory block, the output of the clock generator is connected to the sync inputs of the delay block, block complex conjugation, complex multiplication block, averaging block, phase calculation block, multiplier, key, module calculation block, first and second memory blocks, block for correction of measurement limits and threshold unit, characterized in that the first and second two-channel keys, an additional averaging unit, an additional delay unit, an additional complex conjugation unit and an additional complex multiplication unit are introduced, while the outputs of the complex multiplication unit are connected to the combined inputs of the first and second two-channel keys, the control inputs of which connected respectively to the first and second outputs of the control unit, the outputs of the first two-channel key are connected to the inputs of the averaging unit, the outputs of which are connected inens with the inputs of the additional delay unit, the outputs of the second two-channel key are connected to the inputs of the additional unit of averaging, the outputs of which are connected to the inputs of the additional unit of complex conjugation, the outputs of the additional block of delay are connected to the first inputs of the additional unit of complex multiplication, the second inputs of which are connected to the outputs of the additional unit of complex interfaces, outputs of the additional complex multiplication block are connected to the inputs of the phase calculation block, the block is calculated I module, the second and third inputs of the block for the correction of the limits of measurement, the output of which is connected to the second input of the multiplier, the output of the unit for calculating the module is connected to the second input of the threshold block, the output of the clock is connected to the clock inputs of the first and second two-channel keys, an additional averaging block, an additional delay block, an additional block of complex conjugation and an additional block of complex multiplication, the inputs of the detector for measuring coherent radio signals are the inputs of the block behind hold, and the first and second outputs - respectively, the outputs of the key and threshold block.

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