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Amplitude and phase correction and compensation method of multichannel receiver

A technology of phase correction and compensation method, which is applied in the direction of receiver monitoring, instruments, electrical components, etc.

Inactive Publication Date: 2019-04-19
SHANGHAI RADIO EQUIP RES INST
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  • Abstract
  • Description
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Problems solved by technology

However, this method still needs the help of external phase meter, signal source and other equipment

Method used

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  • Amplitude and phase correction and compensation method of multichannel receiver
  • Amplitude and phase correction and compensation method of multichannel receiver
  • Amplitude and phase correction and compensation method of multichannel receiver

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Embodiment Construction

[0035] The present invention will be further explained below in conjunction with the drawings.

[0036] 1) Establish a channel model of the receiver to be calibrated:

[0037] Attached figure 1 The principle block diagram of the digital intermediate frequency demodulation of the sum and difference channel, where the intermediate frequency and difference signals are expressed as follows

[0038]

[0039]

[0040] Where: Σ, Δ are the amplitudes of the sum and difference signals; Is the phase of the sum and difference signals; η and The amplitude and phase of the sum and difference channels are unbalanced.

[0041] The output signal of the quadrature demodulation of the sum and difference channels is as follows

[0042] And channel: Bad channel:

[0043] Its complex exponential representation is as follows

[0044]

[0045]

[0046] Ideally, Therefore, the calculated angular error value is

[0047]

[0048] In the formula, δ is the angle error, the unit is °; k is the orientation slope, ...

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Abstract

The invention provides an amplitude and phase correction and compensation method of a multichannel receiver. A digital receiver controls to feed a calibration signal into a receiving channel through asum and difference instrument; a sum and difference signal is converted into an intermediate frequency signal through an analog front end; an intermediate frequency calibration signal is sampled by adigital intermediate frequency receiver, orthogonal demodulation is performed by digital down-conversion to obtain orthogonal sum and difference signals; the phase of a digital-controlled oscillatorof a receiver difference channel is controlled to linearly increase from -180 degrees to +180 degrees with 1 degree as an interval; an angle error corresponding to each phase is calculated according to the orthogonal sum and difference signals obtained by the orthogonal demodulation; a phase compensation value is obtained according to a phase and angle error relationship; the calibration signal iscontrolled to be fed into a sum and difference channel, the obtained corrected phase is applied to a difference channel NCO, a 16-point angle error is collected, an average value is calculated to serve as an estimated value of a measurement angle error, an ideal value is known, and an amplitude compensation factor is calculated. A working frequency point is replaced, and the above steps are repeated to complete the phase and amplitude calibration work of all working frequency points of the multichannel receiver.

Description

Technical field [0001] The invention relates to a method for correcting and compensating the amplitude and phase of a multi-channel receiver, and belongs to the field of aerospace measurement and control and digital communication. Background technique [0002] At present, the single pulse angle measurement and tracking system widely used in the measurement and control system requires the phase of the channel and the difference channel to be consistent, so that the antenna can be accurately aligned to the target and stable angle measurement and tracking. The unbalanced phase amplitude of the single pulse measurement and control system and the difference channel will affect the accuracy of angle measurement and the stability of tracking. Therefore, when the single pulse measurement and control system needs to perform high-precision tracking measurement, the phase consistency of the sum and difference channels of the system equipment must be accurately calibrated and calibrated. Th...

Claims

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Application Information

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IPC IPC(8): H04B17/21H04B17/20H04B1/00G01S7/40
CPCG01S7/40H04B1/005H04B17/20H04B17/21
Inventor 李阿明张明利林加涛顾杰徐哲马少飞李腾飞
Owner SHANGHAI RADIO EQUIP RES INST
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