SU970262A1 - Two-channel phase meter - Google Patents

Description

The invention relates to a phase measurement technique and can be used in radionavigation, radar and radio control devices.

A phase meter, a microwave generator, a modulator, a power divider, reference and measuring channels, an element under study, a slot bridge, two directional couplers, two detector heads and a ratio meter 1 are known.

However, this, due to the influence on the measurement error of the non-identity of the conversion factors, and the detector heads has an insufficient measurement accuracy and a complex microwave path.

Closest to the proposed is a two-channel phase meter containing a sum-difference unit, an output connected to fashion divisors, each of which is connected to a phase detector and a differential quadratic detector, a phase shifter connected between the output of one of the dividers and the corresponding input of the phase detector, moreover The inputs of the sum-difference unit are the inputs of a two-channel phase meter, an arctangent transducer connected by corresponding inputs to the inputs of a phase detector, and a differential Nogo quadratic detector 2,

However, this phase meter, due to the nonidentity of the parameters of the phase and differential quadratic detectors in a wide frequency range, has an insufficient accuracy of measurement.

The purpose of the invention is to improve the measurement accuracy in a wide frequency range.

15

The goal is achieved by the fact that in a two-channel phase meter containing a sum-difference block, phase shifter, differential quadratic, detector connected

20 inputs to the outputs of the block sum-difference, arctangent transducer, low-frequency switch introduced between the output of the quadratic differential detector

25 and the inputs of the arctangent converter, and the control unit, the outputs connected to the inputs of the control of the phase shifter, switch, arctangent converter, whip

Claims (2)

30, the phase shifter is connected by an output to one of the inputs of the sum-difference block, and the input of the phase shifter is one of the inputs of a two-channel phase meter. The drawing shows a functional diagram of the device. The two-channel phase meter contains a microwave path consisting of block 1, total difference, phase shifter 2, differential quadratic detector 3, consisting of detectors 4 and 5, and subtractive block b, low-frequency switch 7, arctangent converter 8, block 9 of control. Dual channel phase meter works as follows. The measurement cycle consists of two cycles. In the first cycle, the control unit 9 sets the phase shifter 2 to the zero phase shift state, and the switch 7 to the position at which the signal from the detector 3 output goes to one input of the converter 8. At the same time .S3.n, (1) where Ejj, E | - amplitude of the reference and investigated microwave signals at the inputs of the detector 3; K. is the conversion coefficient of the detector 3; H - the desired phase shift. The signal and,) is stored in transducer 8 until the end of the measurement cycle. At the beginning of the second cycle, the control input of the phase shifter 2 from block 9 receives a signal that sets the phase shifter 2 to a state where the phase shift introduced by it is equal to. Simultaneously, the control input of the switch 7c of the control block 9 receives a pulse, throwing the switch 7 into position where the output of the quadratic differential detector 3 renders a converter 8 connected to the second input, to which a signal is supplied. and .cos. (2) After that, from block 9 to controls, the input of converter 8 supplies a signal according to which converter 8 implements the algorithm and K arctg .. (3) Taking into account expressions (1) and (2), the output voltage of converter 8 can be Express as follows: S (3) where Y), the conversion factor of the arctangent transducer 8. The expression for the measured phase shift does not include the parameters of the elements of the microwave path and the coefficient. converting a differential quadratic detector 3. Thus, the proposed phase meter improves measurement accuracy in a wide frequency range by forming quadrature components sequentially in time and passing these signals through the same quadratic differential detector. Claims of the invention A two-channel phase meter containing a sum-difference block, a phase shifter, a quadratic differential detector connected by inputs to the outputs of the sum-difference block, an arctangent transducer that differs from it in order to improve accuracy over a wide frequency range, a low-frequency switch connected between the output of the differential quadratic detector and the inputs of the arctangent transducer, and the control unit, the outputs connected to the control inputs of the phase shifter, switch, at the same time, the phase shifter is connected to the sum-difference input to one of the block inputs, and the phase shifter input is one of the two-channel phase meter inputs., Information sources taken into account during the examination 1. USSR author's certificate No. 299808, Cl. G 01 R 25/00, 1969. 2. The author's certificate of the USSR 290234, cl. G 01 R 25/04, 1969.