SU720736A1 - Matched complex signal filter - Google Patents

Description

The invention relates to a communication and control system and can be used for consistently filtering complex signals. A matched filter of complex signals is known, which contains the first and second memory elements, the generator and the multiplier (1. However, the known matched file of complex signals has a low accuracy of matching the input signal with the impulse response of the matched filter. The purpose of the invention is to improve the accuracy. For this in the matched filter of complex signals containing the first and second memory elements, the generator, and the multiplier, the multiplier is connected to the upper inputs of the first and second memory elements, each of which made in the form of serially connected first shift register, element) 9 census and vopope sdvn register. ha ,. The point of connection of the control inputs of the second shift regismeras is connected to the generator, the connection point of the control inputs of the census elements and the output of GeTioretor are connected to the first frequency divider, between the connection points of the control inputs of the first shift registers and the output of the first frequency divider , an integrator is connected to the output of the multiplier, between the control input of which and the output of the second frequency divider the delay line is on, while the input signal is fed to the input of the first memory minute, and to the input of the second memory element reference signal is fed. FIG. 1 shows a structural electrical diagram of a matched filter; in fig. Figure 2 shows the structural electrical circuitry of the memory element. The scheme of the matched filter of complex signals contains the first element

i memory, second memory element 2, generator 3, multiplier 4, first divider 5 (frequencies, second divider 6 frequencies, integrator 7, delay line 8, first shift register 9, element j

10 census and second shift register 11. The device works as follows. ,,

The samples of the received signal are recorded in the first memory element 1. From the abacus of the reference signal is recorded in the second memory element 2,.

First register 9 and second register

11 can be executed, for example, in the form of digital registers, each of which for a number of 15 is a memory cell for storing a separate pre-quantized count.

When a sync-pulse is written to the input of the nepjBoro register 9, information is advanced one time, erasing the reference that was previously stored in the headroom, and entering a new reference to the younger one. When the sync-25 momentum arrives at the census input "Item

10 there is a parallel non-destructive reading of the contents of the first register 9 and rewriting of this content through the census element 1O into the second 30 register 11. When the clock pulses arrive at the read input of the second register

11 there is a sequential reading of 11 counts recorded in the second register with the subsequent cleaning of each discharge. Generator 35, the first frequency divider 5

and the second frequency divider 6 is used to form the control pulses for recording, rewriting and reading information in the first: memory element 1 and BTOJXJM element 2 PST.

The information from the output of the first memory element 1 is multiplied with the information of the second memory element 2 on multiplier 4 and integrated on the integrator 7. From the output of the second frequency divider 6 through the delay line 8; integrator 7 receives the polling pulses. At the output of integrator 7, correlation function counts are formed. The pulses from the second frequency divider 6 also reset the integrator.

7.:.

The matched filter parameters are selected so that all read operations on the contents of a1 of the first memory element 1 and of the second memory element 2, multiply the read samples, accumulate samples in integrator 7, issue correlation function samples, and reset the integrator 7 before the next census sync pulse is received .

Claims (1)

1. Aces GI. Statistical theory of receiving complex signals, Soviet Radio, 1977, p. 114, rice, 3.6 (prototype). Fi, g. -f