# US 11,029,151 B2 · Traverse-type measurement method for dual-system bilateral-survey composite level

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,029,151 B2
- Document ID: US11029151B2
- Status: Granted
- Kind: B2
- Application number: 16/312,290
- Filed: 2018-04-19
- Published: 2019-07-04
- Granted: 2021-06-08
- Earliest claimed: 2017-05-03
- Assignees: Dalian Senbior Surveying Instrument Technology Co., Ltd.
- Applicants: Dalian Senbior Surveying Instrument Technology Co., Ltd.
- Inventors: Yanchun Liu; Qiang Meng; Yao Liu
- Web page: https://patentgrep.com/patent/US11029151B2

## CPC

- G01C 5/00: Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels (G01C3/20, G01C3/30 take precedence)
- G01B 11/00: Measuring arrangements characterised by the use of optical techniques
- G01B 21/02: for measuring length, width, or thickness (G01B21/10 takes precedence)
- G01C 9/00: Measuring inclination, e.g. by clinometers, by levels
- G01C 15/002: {Active optical surveying means (optical plumbing G01C15/105)}
- G01C 15/004: {Reference lines, planes or sectors}
- G01C 15/06: Surveyors' staffs; Movable markers
- G01S 5/021: {Calibration, monitoring or correction (G01S5/0252 takes precedence)}
- G01S 19/07: providing data for correcting measured positioning data, e.g. DGPS [differential GPS] or ionosphere corrections
- G01C: MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY (measuring liquid level G01F; radio navigation, determining distance or velocity by use of propagation effects, e.g. Doppler effects, propagation time, of radio waves, analogous arrangements using other waves G01S)
- G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- 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

## Abstract

A traverse-type measurement method for a dual-system bilateral-survey composite level (A, B) is an intelligent traverse-type measurement method for integrated three-level error control loop inspection with the dual-system bilateral survey compound level (A, B). Specifically, survey station single-instrument inspection, survey station dual-instrument cross-inspection, and multi-survey station dual-instrument cumulative cross-inspection are adopted, and the number of observations and distance between survey stations are adjusted, such that measurement error is dynamically controlled in real time, ensuring that height difference measurement of survey stations and of measurement sections meets a preset precision requirement regardless of location or time, avoiding the invalid measurements that frequently occur with traditional levels, and improving working efficiency and economic benefit of the composite level.

## Claims

### Claim 1

A traverse-type measurement method for a dual-system bilateral-survey composite level, comprising the following steps:
Step 1: measuring instrument parameter information;
Step 2: determining start and end measurement points of a measurement section, and placing a composite level A at the start measurement point;
Step 3: placing instruments and establishing survey stations;
Step 4: setting an initial number of observations and setting k=1, wherein k is a current survey station setup stage number;
Step 5: separately observing readings on the composite level A and a composite level B according to the set number of observations, and separately calculating errors of the readings;
Step 6: determining whether the errors of the readings exceed a limit,
wherein if the errors do not exceed the limit, Step 7 is performed; if any error exceeds the limit, the number of observations is increased and it is determined whether the number of observations exceeds a threshold M; if the number of observations does not exceed M, Step 5 is performed again, and if the number of observations exceeds M, a front measurement point is moved to reduce a survey station distance, and then it is determined whether the survey station distance Dk is less than a threshold D0; if Dk is less than D0, the measurement is ended; otherwise, Step 3 is performed again;
Step 7: calculating an average reading of the composite level A as a survey station height difference hkA of the level A; calculating an average reading of the composite level B as a survey station height difference hkB of the level B; and calculating a mutual deviation δAB between the survey station height differences of the two levels;
Step 8: determining whether |δAB| exceeds tolerance δ0,
wherein if |δAB| does not exceed δ0, Step 9 is performed; and
if |δAB| exceeds δ0, the number of observations is increased and then it is determined whether the number of observations exceeds the threshold M; if the number of observations does not exceed M, Step 5 is performed again, and if the number of observations exceeds M, the front measurement point is moved to reduce the survey station distance, and then it is determined whether the survey station distance Dk is less than the threshold D0; if Dk is less than D0, the measurement is ended; otherwise, Step 3 is performed again;
Step 9: calculating an average of the survey station height differences of the two levels as a height difference hk of the current survey station;
Step 10: calculating a cumulative survey station height difference HkA of the composite level A; and calculating a cumulative survey station height difference HkB of the composite level B;
Step 11: calculating a difference ΔAB between the cumulative survey station height differences of the two levels;
Step 12: determining whether |ΔAB| exceeds tolerance Δ0,
wherein if |ΔAB| exceeds Δ0, the front measurement point is moved to reduce the survey station distance, and then it is determined whether the survey station distance Dk is less than the threshold D0; if Dk is less than D0, the measurement is ended; otherwise, Step 3 is performed again; and
if |ΔAB| does not exceed Δ0, Step 13 is performed;
Step 13: calculating a sum Hk of all survey station height differences; and
Step 14: determining whether the composite level A is placed at the end measurement point; if not, moving a composite level on a rear measurement point, setting k to be equal to k+1, and performing Step 3 again; if yes, ending the measurement.