CN111366133B - High-precision offset positioning depth sounding auxiliary system and method - Google Patents

High-precision offset positioning depth sounding auxiliary system and method Download PDF

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Publication number
CN111366133B
CN111366133B CN202010222469.5A CN202010222469A CN111366133B CN 111366133 B CN111366133 B CN 111366133B CN 202010222469 A CN202010222469 A CN 202010222469A CN 111366133 B CN111366133 B CN 111366133B
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telescopic rod
rod
scale
gps receiver
section
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CN111366133A (en
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王旭
修明军
刘明旭
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Xiu Mingjun
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Xiu Mingjun
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C7/00—Tracing profiles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C15/00—Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13—Receivers
    • G01S19/14—Receivers specially adapted for specific applications
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
    • Y02A90/30—Assessment of water resources

Abstract

The invention belongs to the technical field of river section surveying and mapping, and relates to a high-precision offset positioning depth measurement auxiliary system and method. The auxiliary system comprises a chassis and a main supporting frame, wherein the bottom end of the main supporting frame is connected with the chassis, and an adjusting groove is formed in the main supporting frame; the GPS receiver fixing rod is arranged at the top end of the main support frame, and a GPS receiver is arranged on the GPS receiver fixing rod; the front end of the telescopic rod with the scales is connected with the main support frame; a leveling bubble I and a fixing screw II are arranged on the telescopic rod with the scales; the measuring device is connected with the upper end of the main supporting frame through a fixed connecting rod; a compass is arranged above the measuring device, and a leveling bubble II is arranged on the side surface of the measuring device; one end of the supporting arm is connected with the adjusting groove, and the other end of the supporting arm is connected with the telescopic rod with the scales. Both ends of the supporting arm are provided with through holes II. By adopting the invention, a measurer can directly acquire the three-dimensional data of the section points required by the river water area part at the bank, thereby reducing the operation danger and the operation cost and improving the data precision and the operation efficiency.

Description

High-precision offset positioning depth sounding auxiliary system and method
Technical Field
The invention belongs to the technical field of river section surveying and mapping, and particularly relates to a high-precision offset positioning depth measurement auxiliary system and method.
Background
In modern water conservancy governing engineering, the proportion of medium and small river channels is very large, and the key to the governing of medium and small river channels is the measurement result of the vertical and horizontal sections of the river channels. The task of surveying and mapping the cross section of the river channel is to measure the height and the waviness of each topographic point on the cross section line of the river channel and draw a cross section diagram. The section measurement is mainly divided into land measurement and underwater measurement, the land measurement method is mature at present, and the underwater measurement method is mainly realized by a measuring person hand-held measurement positioning instrument (GPS-RTK), a depth sounding rod, a depth sounding hammer and an echo depth sounder at present.
At the present stage, the river bottom elevation measurement methods mainly include the following methods: firstly, the method comprises the following steps: in a river section with shallow water (within 0.6m of water depth, the flow velocity is not more than 3m/s), GPS-RTKRTK is held by a measurer to directly wade for measurement, and three-dimensional data of the river bottom is collected. II, secondly: the water depth is measured by using a sounding rod and a sounding hammer, and plane and elevation data of the river bottom are obtained by combining RTK. Thirdly, the steps of: the echo sounding system measures the water depth by a carrier (measuring ship), and obtains the river bottom plane and elevation by processing the water depth data.
The first measurer holds the measuring instrument by hand and measures river bottom data by wading directly, the method has great harm to personal safety, is limited by water depth (wading measurement water depth can not exceed 0.6m, and flow velocity does not exceed 3m/s), and influences working willingness of the measurer in winter cold in the north. The second depth measurement rod and the depth measurement hammer are used for measuring water depth, RTK is combined to obtain river bottom plane elevation data, and a measurer needs to complete operation under the condition that a ship exists. And the third method utilizes a ship-borne echo sounding system, has higher cost, and can not flexibly work on the measuring section of a narrow river channel.
Disclosure of Invention
Aiming at the problems, the invention provides a high-precision offset positioning sounding auxiliary system and a high-precision offset positioning sounding auxiliary method. By adopting the invention, a measurer can directly collect three-dimensional data of the section points required by the river channel water area part at the bank, the operation is flexible, the operation risk is reduced, the operation cost is reduced, and the data precision and the operation efficiency are improved.
The invention relates to a high-precision offset positioning sounding auxiliary system, which comprises a chassis and also comprises:
the bottom end of the main support frame is connected with the chassis, and the main support frame is provided with an adjusting groove;
the GPS receiver fixing rod is arranged at the top end of the main support frame, and a GPS receiver is arranged on the GPS receiver fixing rod;
the front end of the telescopic rod with the scales is connected with the main support frame; a leveling bubble I and a fixing screw II are arranged on the telescopic rod with the scales;
the measuring device is connected with the upper end of the main support frame through a fixed connecting rod; a compass is arranged above the measuring device, and a leveling bubble II is arranged on the side surface of the measuring device;
one end of the supporting arm is connected with the adjusting groove, and the other end of the supporting arm is connected with the telescopic rod with the scales. Both ends of the supporting arm are provided with through holes II.
The chassis is provided with a bolt, and the bottom of the main support frame is provided with a slot matched with the bolt.
The main support frame is of a cavity structure, a through hole I is formed in the upper end of the side wall of the main support frame, and an adjusting groove is formed below the through hole I; one end of the fixed connecting rod is provided with a through hole I, and the other end of the fixed connecting rod is provided with a through hole III.
The fixing rod of the GPS receiver is of a cavity structure, and a through hole I is formed in the lower end of the side wall of the fixing rod of the GPS receiver.
The front end of the telescopic rod with the scales is provided with a through hole I, a cylinder is inserted into the through hole I, and the cylinder is arranged in a cavity of a fixed rod of the GPS receiver; the main support frame, the GPS receiver fixing rod, the fixing connecting rod and the cylinder are fastened through a fixing screw I penetrating through the through hole I.
The telescopic rod with the scales at least comprises five telescopic rods, and leveling air bubbles I and fixing screws II are arranged on two sides of the first telescopic rod.
The measuring device comprises a box body, a measuring scale outlet is arranged on the box body, a rotating shaft is arranged in the box body, a measuring scale is wound on the rotating shaft, and a bolt and a handle connected with the rotating shaft are arranged outside the box body; the outlet of the measuring scale is parallel and level with the upper surface of the telescopic rod with the scales.
The tail end of the telescopic rod with the scales is provided with a semicircular hole.
The dipperstick passes semicircle orifice and the end is equipped with the plummet.
The invention also provides a high-precision offset positioning depth measurement method, which adopts the auxiliary system for measurement and comprises the following steps:
(1) assembling a main support frame, a measuring device, a telescopic rod with scales and a GPS receiver fixing rod; the specific process is as follows: the two supporting arms are respectively fixed in adjusting grooves on two sides of a main supporting frame through adjusting screws through holes II (the positions are 30cm from the center of a fixing screw I), a cylinder is inserted into a through hole I at the front end of a first section of telescopic rod with a scale telescopic rod (in a contraction state), the fixing screw I sequentially penetrates through a through hole I, GPS at the upper end of the side wall of the main supporting frame to fix the lower end of the side wall of a receiver fixing rod through hole I, the through hole I is fixed in a connecting rod hole, the cylinder (inserted into the telescopic rod), a GPS receiver fixing rod is adjusted to be vertical, and then the main supporting frame is screwed. The through holes III at the other end of the fixed connecting rod are respectively inserted into the bolts at the two sides of the outer part of the box body.
(2) Placing the base at the boundary of the bank slope and the water surface, treading to ensure that the disc surface of the base is level with the water surface (not submerged by the water surface and can not be higher than the water surface), and inserting the slot at the center of the bottom of the main support frame into the base bolt;
(3) the telescopic rod with the scales in the contraction shape is pulled up to the horizontal position, the supporting arms on the two sides are fixed on the fixing screws II on the two sides of the first section of the telescopic rod through the through holes II, the telescopic rod is orthogonal to the main supporting frame, and the GPS receiver is fixed on the top of the fixing rod of the GPS receiver;
(4) the measuring scale is pulled out from an outlet of the measuring scale, is pulled out to the tail end of the telescopic rod with the scale along the upper surface of the telescopic rod with the scale, passes through the semicircular hole and is hung with a plumb bob;
(5) sequentially extending a fifth telescopic rod, a fourth telescopic rod, a third telescopic rod and a second telescopic rod to enable the plumb to be located above the position where the section data needs to be collected, adjusting the two leveling pipes to enable the bubble to be located at the center position, and releasing the measuring scale to enable the plumb to sink into the river bottom;
(6) reading the azimuth angle alpha of the telescopic rod through a compass; reading the scale of the telescopic rod to obtain the horizontal distance L1 (unit m) from the measuring station to the plumb bob position (to-be-measured point), reading the reading of the measuring scale at the position of a fixed screw I to obtain L (unit m), calculating A (L-L1 + H1(H1 is the vertical distance from the top end of a fixed rod of a receiver to the upper surface of the telescopic rod with the scale, and has a fixed value of 0.2m), so as to obtain the vertical distance from the receiver to the plumb bob position, starting the offset measurement of the GPS handbook, inputting the azimuth angle alpha, L1 (the offset from the plumb bob position to a supporting rod) and A into the GPS-RTK handbook respectively as the azimuth angle, the offset distance and the height, and completing the clicking to obtain the plane following elevation data of the plumb bob position;
(7) and (5) sequentially contracting the second section, the third section, the fourth section and the fifth section of the telescopic rod, and repeating the sixth step to read data to obtain the obtained section data.
In the invention, the water depth H of a point to be measured is L-L1-H0, and H0 is the vertical distance from the bottom end of the supporting rod to the upper surface of the scale telescopic rod, and is unit m.
In conclusion, the invention has the following beneficial effects:
(1) direct wading measurements can be avoided;
(2) the coordinates and the elevation obtained by the GPS-RTK can be transmitted to the topographic points to be measured in the river channel through the geometrical relationship among the supporting rod, the telescopic rod and the measuring ruler, so that more accurate three-dimensional coordinate data can be obtained, the data precision is greatly improved, and more accurate basis is provided for river channel hydrological calculation and river channel silt clearing amount calculation;
(3) compared with the traditional application ship which is used as a carrier for carrying out depth measurement rod, depth measurement hammer or echometer depth measurement, the invention has the advantages of more flexibility, convenience and lower cost.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a left side view of FIG. 1 (omitting the measuring device)
FIG. 3 is an enlarged view of a portion A of FIG. 2;
FIG. 4 is an enlarged view of a portion B of FIG. 2;
FIG. 5 is a schematic view of a support arm according to the present invention;
FIG. 6 is a schematic view of the front view of the telescopic rod with scales of the present invention;
FIG. 7 is a schematic top view of the first section of the telescoping rod;
FIG. 8 is a schematic top view of the second section of the telescoping rod;
FIG. 9 is a schematic top view of the third section of the telescoping rod;
FIG. 10 is a schematic top view of the fourth section of the telescopic rod;
FIG. 11 is a schematic top view of the fifth section of the telescopic rod;
FIG. 12 is a schematic top view of the measuring device of the present invention;
FIG. 13 is a schematic top view of the internal structure of the measuring device according to the present invention;
in the figure: 1. a chassis, 2, main tributary strut, 3, the adjustment tank, 4, GPS receiver dead lever, 5, the GPS receiver, 6, take the scale telescopic link, 7, level bubble I, 8, set screw II, 9, measuring device, 10, fixed connecting rod, 11, the compass, 12, level bubble II, 13, the support arm, 14, the bolt, 15, the slot, 16, through-hole I, 17, the drum, 18, set screw I, 19, the plummet, 20, the semicircle orifice, 21, the box body, 22, the pivot, 23, the dipperstick, 24, the handle, 25, adjust the spiral, 26, through-hole II, 27, the dipperstick export, 28, through-hole III.
Detailed Description
A high-precision offset positioning sounding auxiliary system comprises a chassis 1 and a sounding auxiliary system
The bottom end of the main support frame 2 is connected with the chassis 1, and the main support frame 2 is provided with an adjusting groove 3;
the GPS receiver fixing rod 4 is arranged at the top end of the main supporting frame 2, and a GPS receiver 5 is arranged on the GPS receiver fixing rod 4;
the front end of the telescopic rod 6 with scales is connected with the main support frame 2; a leveling bubble I7 and a fixing screw II8 are arranged on the telescopic rod 6 with the scale;
the measuring device 9 is connected with the upper end of the main support frame 2 through a fixed connecting rod 10; a compass 11 is arranged above the measuring device 9, and a leveling bubble II12 is arranged on the side surface;
one end of the supporting arm 13 is connected with the adjusting groove 3, and the other end of the supporting arm is connected with the telescopic rod 6 with scales.
The chassis 1 is provided with a bolt 14, and the bottom of the main support frame 2 is provided with a slot 15 matched with the bolt 14.
The main support frame 2 is of a cavity structure, the upper end of the side wall of the main support frame 2 is provided with a through hole I16, and an adjusting groove 3 is arranged below the through hole I16; one end of the fixed connecting rod 10 is provided with a through hole I16.
The GPS receiver fixing rod 4 is of a cavity structure, and a through hole I16 is formed in the lower end of the side wall of the GPS receiver fixing rod 4.
The front end of the telescopic rod 6 with the scale is provided with a through hole I16, a cylinder 17 is inserted into the through hole I16, and the cylinder 17 is arranged in a cavity of the fixing rod 4 of the GPS receiver; the main supporting frame 2, the GPS receiver fixing rod 4, the fixing connecting rod 10 and the cylinder 17 are fastened through a fixing screw I18 penetrating through the through hole I16.
Take scale telescopic link 6 at least include five sections telescopic links, first section telescopic link both sides are equipped with level bubble I7 and fixed screw II 20.
The measuring device 9 comprises a box body 21, a measuring scale outlet is formed in the box body 21, a rotating shaft 22 is arranged in the box body 21, a measuring scale 23 is wound on the rotating shaft 22, and a bolt 14 and a handle 24 connected with the rotating shaft 22 are arranged outside the box body 21; the outlet of the measuring scale is parallel and level with the upper surface of the telescopic rod 6 with the scales.
The tail end of the telescopic rod 6 with the scales is provided with a semicircular hole 20.
The measuring scale 23 penetrates through the semicircular hole 20, and the tail end of the measuring scale is provided with a plumb bob 19.
The auxiliary system of the invention is adopted to carry out high-precision offset positioning and depth measurement, and comprises the following steps:
(1) assembling a main support frame, a measuring device, a telescopic rod with scales and a GPS receiver fixing rod;
(2) placing the base at the boundary of the bank slope and the water surface, treading tightly to enable the disc surface of the chassis to be level with the water surface line, and inserting the slot in the center of the bottom of the main support frame into the chassis bolt;
(3) the telescopic rod with the scales in the contraction shape is pulled up to the horizontal position, the supporting arms at the two sides are fixed on the fixing screws II at the two sides of the first section of the telescopic rod, the telescopic rod is orthogonal to the supporting rod, and the GPS receiver is fixed at the top of the GPS receiver fixing rod;
(4) pulling out the measuring scale to the tail end of a telescopic rod with scales, and hanging a plumb bob;
(5) sequentially extending a fifth telescopic rod, a fourth telescopic rod, a third telescopic rod and a second telescopic rod to enable the plumb to be located above the position where the section data needs to be collected, adjusting the two leveling pipes to enable the bubble to be located at the center position, and releasing the measuring scale to enable the plumb to sink into the river bottom;
(6) reading the azimuth angle alpha of the telescopic rod through a compass; reading the scale of the telescopic rod to obtain the horizontal distance L1 from the measuring station to the plumb bob position (to-be-measured point), reading the reading of the measuring scale at the position of a fixed screw I to obtain L, calculating A to be L-L1+ H1 (with a fixed value of 0.2m), obtaining the vertical distance from the receiver to the plumb bob position, starting the offset measurement of the GPS handbook, inputting the azimuth angle alpha, L1 (offset from the plumb bob position to the supporting rod) and A to the GPS handbook as the azimuth angle, the offset distance and the height respectively, and completing clicking to obtain the plane following elevation data of the plumb bob position;
(7) and (5) sequentially contracting the second section, the third section, the fourth section and the fifth section of the telescopic rod, and repeating the sixth step to read data to obtain the obtained section data.

Claims (5)

1. A high-precision offset positioning depth measurement method is characterized in that a high-precision offset positioning depth measurement auxiliary system is adopted for measurement, and the method comprises the following steps:
(1) assembling a main support frame, a measuring device, a telescopic rod with scales and a GPS receiver fixing rod;
(2) placing the base at the boundary of the bank slope and the water surface, treading tightly to enable the disc surface of the chassis to be level with the water surface line, and inserting the slot in the center of the bottom of the main support frame into the chassis bolt;
(3) the telescopic rod with the scales in the contraction shape is pulled up to the horizontal position, the supporting arms at the two sides are fixed on the fixing screws II at the two sides of the first section of the telescopic rod, the telescopic rod is orthogonal to the supporting rod, and the GPS receiver is fixed at the top of the GPS receiver fixing rod;
(4) pulling out the measuring scale to the tail end of a telescopic rod with scales, and hanging a plumb bob;
(5) sequentially extending a fifth telescopic rod, a fourth telescopic rod, a third telescopic rod and a second telescopic rod to enable the plumb to be located above the position where the section data needs to be collected, adjusting the two leveling pipes to enable the bubble to be located at the center position, and releasing the measuring scale to enable the plumb to sink into the river bottom;
the scale of the first section of telescopic rod is 0-0.5m, the scale of the second section of telescopic rod is 4.5-3.5m, the scale of the third section of telescopic rod is 3.5-2.5m, the scale of the fourth section of telescopic rod is 2.5-1.5m, and the scale of the fifth section of telescopic rod is 1.5-0.5 m;
(6) reading the azimuth angle alpha of the telescopic rod through a compass; reading the scale of the telescopic rod to obtain the horizontal distance L1 from the measuring station to the plumb bob position, namely the horizontal distance to be measured, reading the reading of the measuring ruler at the position of a fixed screw I to obtain L, calculating A = L-L1+ H1, wherein H1 is a fixed value of 0.2m to obtain the vertical distance from the receiver to the plumb bob position, starting the offset measurement of the GPS handbook, inputting the azimuth angle alpha, L1 and A as the azimuth angle, the offset distance and the height to the GPS-handbook respectively, completing the clicking to obtain the plane following elevation data of the plumb bob position, and L1 is the offset from the plumb bob position to the supporting rod; the water depth H = L-L1-H0 of the point to be measured, H0 is the vertical distance from the bottom end of the supporting rod to the upper surface of the scale telescopic rod, and the unit is m;
(7) sequentially contracting the second section, the third section, the fourth section and the fifth section of the telescopic rods, and repeating the step (6) to read data to obtain the obtained section data;
the high-precision offset positioning sounding auxiliary system comprises a chassis (1) and further comprises
The bottom end of the main support frame (2) is connected with the chassis (1), and the main support frame (2) is provided with an adjusting groove (3);
the GPS receiver fixing rod (4) is arranged at the top end of the main supporting frame (2), and a GPS receiver (5) is arranged on the GPS receiver fixing rod (4);
the front end of the telescopic rod (6) with scales is connected with the main support frame (2); a leveling bubble I (7) and a fixing screw II (8) are arranged on the telescopic rod (6) with the scale;
the measuring device (9) is connected with the upper end of the main support frame (2) through a fixed connecting rod (10); a compass (11) is arranged above the measuring device (9), and a leveling bubble II (12) is arranged on the side surface;
one end of the supporting arm (13) is connected with the adjusting groove (3), and the other end of the supporting arm is connected with the telescopic rod (6) with scales;
the GPS receiver fixing rod (4) is of a cavity structure, and the lower end of the side wall of the GPS receiver fixing rod (4) is provided with a through hole I (16);
the front end of the telescopic rod (6) with the scale is provided with a through hole I (16), a cylinder (17) is inserted into the through hole I (16), and the cylinder (17) is arranged in a cavity of the fixing rod (4) of the GPS receiver; the main support frame (2), the GPS receiver fixing rod (4), the fixing connecting rod (10) and the cylinder (17) are fastened through a fixing screw I (18) penetrating through the through hole I (16);
the telescopic rods (6) with the scales at least comprise five telescopic rods, and leveling air bubbles I (7) and fixing screws II (8) are arranged on two sides of the first telescopic rod;
the measuring device (9) comprises a box body (21), a measuring scale outlet is formed in the box body (21), a rotating shaft (22) is arranged in the box body (21), a measuring scale (23) is wound on the rotating shaft (22), and a bolt (14) and a handle (24) connected with the rotating shaft (22) are arranged outside the box body (21); the outlet of the measuring scale is parallel and level with the upper surface of the telescopic rod (6) with the scale.
2. A high-precision offset positioning depth measurement method according to claim 1, wherein a plug pin (14) is provided on the chassis (1), and a slot (15) adapted to the plug pin (14) is provided at the bottom of the main support frame (2).
3. A high-precision offset positioning depth sounding method according to claim 1, wherein the main support frame (2) is a cavity structure, a through hole I (16) is provided at the upper end of the side wall of the main support frame (2), and an adjusting groove (3) is provided below the through hole I (16); one end of the fixed connecting rod (10) is provided with a through hole I (16).
4. A high precision offset positioning depth measurement method according to claim 1, wherein the end of the telescopic rod (6) with scale is provided with a semicircular hole (20).
5. A high accuracy offset positioning sounding method according to claim 4, characterized in that the measuring ruler (23) passes through the semi-circular hole (20) and is provided with a plumb bob (19) at its end.
CN202010222469.5A 2020-03-26 2020-03-26 High-precision offset positioning depth sounding auxiliary system and method Active CN111366133B (en)

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CN112050798B (en) * 2020-08-20 2022-06-28 广东稳固检测鉴定有限公司 Building engineering verticality detection device and detection method
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CN102519428B (en) * 2011-12-09 2014-07-23 清华大学 Apparatus positioning and controlling device for river cross-section measurement
US8776592B2 (en) * 2012-06-15 2014-07-15 Yi-Jiun Liao Automatic hydrologic parameter measuring system for river flow and the method using the same
CN104949662B (en) * 2015-07-09 2017-07-11 天津市地质工程勘察院 A kind of GPS measurement room angle support devices and its measuring method
CN205785208U (en) * 2016-05-13 2016-12-07 无锡市政设计研究院有限公司 Combined depth finder
CN109556583A (en) * 2018-12-24 2019-04-02 重庆南江建设工程公司 A kind of vertical degree of the peg hole and azimuth measuring instrument and measurement method
CN211601934U (en) * 2020-03-26 2020-09-29 王旭 High-precision offset positioning and depth sounding auxiliary system

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