6results about How to "Reduce ranging error" patented technology

The invention discloses a vehicle distance measurement and calibration method based on laser radar and binocular vision fusion, relates to the technical field of measurement and calibration, and is used for solving the problem that the precision of a vehicle distance calibration result is reduced when a laser radar used for calibrating a highway vehicle distance snapshot system is under the conditions of rain, snow, wet and slippery or waterlogging road surfaces. Joint modeling is carried out on spatial distribution and echo energy characteristics of laser radar low-height point cloud, a point cloud echo coefficient and a low-height number proportion are introduced, a specular reflection state code is constructed, a self-calibration mechanism is adaptively triggered accordingly, and a specular reflection state is obtained. The discrete characteristic of a laser radar vehicle distance time sequence and the degradation trend of binocular vision parallax connectivity are subjected to quantitative analysis, the dominant source of ranging abnormity is judged through symbolic analysis, and an offset calibration or fusion correction strategy is selected according to the dominant source. Reliability and engineering adaptability of vehicle distance measurement under the wet and slippery road surface condition can be improved under the condition of not depending on an additional sensor.

The application discloses a ranging method, comprising: obtaining a mapping relationship between serial numbers of actual data boxes and serial numbers of preset data boxes, wherein each actual data box is mapped to at least one preset data box; obtaining ranging data, assigning storage space to the actual data boxes and storing the ranging data; determining a target data box and a serial number of the target data box according to data distribution of the ranging data in the actual data boxes; determining a target value of a preset data box corresponding to the target data box according to the mapping relationship between the serial numbers of the actual data boxes and the serial numbers of the preset data boxes and according to a preset algorithm; and determining a distance of a measured target according to the target value of the preset data box and a width of the preset data box. The application also provides a ranging system, which can reduce storage space.

The invention discloses a Bluetooth positioning method, device and system, an electronic device, a medium and a program product, and belongs to the field of Bluetooth positioning. The method is executed by a first device, the first device is in communication connection with at least one second device, and the method comprises the following steps: the first device sends a Bluetooth positioning request; the first device and the positioned device perform Bluetooth channel detection (CS) information interaction to determine a first distance between the first device and the positioned device; the first device receives second distance information sent by each second device, wherein the second distance information comprises a second distance between the second device and the positioned device determined by the second device in response to the Bluetooth positioning request; and the first equipment determines the distance between the object and the positioned equipment based on the first distance and the second distance.

The invention provides a multi-GHz clock tree dynamic phase calibration system and a deviation suppression method, and relates to the technical field of high-speed electronic system clock synchronization. According to the multi-GHz clock tree dynamic phase calibration system based on standing wave integrity monitoring and the deviation suppression method, a phased array radar realizes accurate beam pointing through sub-picosecond clock synchronization of hundreds of array elements, and the compensation precision of the system for environmental interference in a radar cabin is greatly improved in a full temperature range of-40 DEG C to 65 DEG C; phase deviation caused by temperature is suppressed and reduced through dynamic phase calibration, and radar ranging errors are reduced; and cable vibration bending compensation is carried out, phase deviation caused by bending and vibration is compensated for aiming at cable bending and vibration scenes among array elements, the speed measurement precision is improved, and the high-precision distance measurement and speed measurement requirements are met.

This invention belongs to the field of sensor testing technology, specifically a testing method and system for ultrasonic ranging sensors under high-temperature conditions. The method includes constructing test benchmark data, establishing a first-wave trigger stability criterion under low signal-to-noise ratio conditions, setting a dynamic threshold range that varies with temperature, and a high-temperature dynamic calibration standard. Multi-temperature gradient testing is performed, raw echo waveform data is collected and filtered for enhancement, the first-wave arrival time is extracted, and the validity of the first-wave trigger is determined by combining the dynamic threshold range to obtain calibrated ranging data. The calibrated ranging data is compared with the true standard distance value to calculate the measurement error and repeatability accuracy. If the first-wave trigger stability criterion fails to meet requirements or the measurement error exceeds the allowable range within multiple consecutive test cycles, the sensor under test is deemed unqualified under high-temperature conditions. This invention improves trigger reliability, significantly enhances test accuracy, efficiency, and reliability, and strengthens the adaptability of the testing method to different high-temperature conditions.

The invention discloses a satellite navigation MBOC signal non-fuzzy tracking method and system based on multiple harmonic components, and solves the technical problem of poor ranging precision caused by the existing multi-harmonic multi-channel subcarrier combined tracking scheme for multiplexing binary offset carrier modulation signals. The method comprises the following steps: acquiring a local carrier parameter initial estimation value and a digital intermediate frequency MBOC signal, generating a baseband signal, and generating a plurality of orthogonal local subcarriers and parameter adjustment amounts; then, combining with the phase estimation value at the historical moment, updating to obtain a subcarrier phase estimation value and a code phase estimation value; after a locking state is reached, calculating a code delay coarse estimation value and an original delay estimation value of each orthogonal local subcarrier so as to obtain a non-fuzzy delay estimation value; and finally, outputting a high-precision unambiguous tracking ranging result based on the tracking jitter variance of each unambiguous delay estimated value by adopting a minimum variance criterion.