Full signal sea echo simulator

A sea surface echo and simulator technology, applied in instruments, radio wave measurement systems, etc., can solve the problems of inability to accurately simulate the transmission delay of two-way paths, inability to simulate sea surface echoes, etc., to achieve measurement, calibration, and avoidance. System complex effects

Inactive Publication Date: 2008-10-15
NAT SPACE SCI CENT CAS
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Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide a full-signal sea echo simulator to solve the problems in the prior art that cannot accurately simulate the two-way path transmission delay, can

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  • Full signal sea echo simulator
  • Full signal sea echo simulator

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings. Figure 1 to Figure 3 It is an introduction to the prior art, which has been described in detail above and will not be repeated here.

[0028] The invention integrates a point target simulator and a sea surface echo simulator, and can simulate not only the point target response of the altimeter, but also the sea surface echo signal.

[0029] Figure 4 , Figure 5 The block diagram of the all-signal sea echo simulator of the present invention is given, which includes a frequency synthesis unit, a receiving unit, an up-conversion unit and a numerical control unit.

[0030] The frequency synthesis unit is used to provide standard local oscillator signals for the up-conversion unit and the receiving unit, including a frequency synthesizer, a chirp generator, a frequency multiplier, an isolator, a first local oscillator, and a second local oscillator , up-convers...

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Abstract

The holographic sea surface echo simulator for simulating RF sea surface echo includes frequency synthesizing unit, receiving unit, upper frequency varying unit and numerical control unit. The frequency synthesizing unit provides the receiving unit and the upper frequency varying unit with standard local vibration signal; the receiving unit processes the emitted signal from the altimeter; the upper frequency varying unit modulates the sea surface echo simulating signal or point target response signal from the numerical control unit on Chirp; and the numerical control unit completes the digital synthesis of the sea surface echo simulating signal and the point target response signal. The present invention adopts multiple frequency point digital synthesis technology to simulate sea surface echo spectrum accurately and pulse rebuilding technology to realize the accurate measurement of systemic delay and linearity of altimeter.

Description

technical field [0001] The invention relates to a ground test system for a spaceborne marine radar altimeter, in particular to a sea surface echo simulator therein. Background technique [0002] The sea surface echo simulator is the most important equipment in the ground test system of the spaceborne marine radar altimeter. With the development of satellite altimetry technology, most of today's spaceborne radar altimeters use high pulse compression ratio and long linear frequency modulation pulse (Chirp) emission. system, whose pulse width is usually tens to 100 microseconds, it is difficult to achieve the purpose of testing the instrument through aviation calibration; at the same time, the altimeter system as a high-precision satellite altimetry instrument also requires precise ground testing and calibration . The sea surface echo simulator uses the simulation of the radio frequency sea surface echo to realize the whole system test of the altimeter, which can precisely det...

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Application Information

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IPC IPC(8): G01S7/40
Inventor 郭伟张晓辉
Owner NAT SPACE SCI CENT CAS
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