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Optical satellite sensor and positioning accuracy analysis for the Hongqi1H9 widerange satellite in different terrains
EURASIP Journal on Wireless Communications and Networking volume 2021, Article number: 3 (2021)
Abstract
The excellent performance of geometric positioning of a newly launched satellite will greatly broaden its application field. Launched on January 15, 2020, the Hongqi1H9 widerange satellite is the largest submeterlevel satellite worldwide and the first tonlevel commercial remote sensing satellite in China, with a resolution of less than 1 m and a swath width of 136 km. This study was aimed at assessing the geometric positioning accuracy of this newly launched satellite considering three aspects, namely, the circle error accuracy, rational polynomial coefficientbased direct geometric positioning accuracy and ground control pointbased absolute positioning accuracy under urban, plain, and mountainous areas, with different topographies. The results of the conducted experimental investigation indicated that the Hongqi1H9 satellite could exhibit a high positioning accuracy in planar and vertical directions for different terrains. In particular, for our experimental areas with a low topography and few surface structures, the geometric positioning accuracy of the Hongqi1H9 satellite imagery was less than 4m and 2 m in the planimetry and elevation directions, respectively. These characteristics can promote the application of the Hongqi1H9 satellite images in agricultural surveys, target detection, and land surveys, among other domains.
Introduction
Despite the rapid advancement in satellite remote sensing technology, two key requirements to obtain highspatialresolution satellite images remain to be attained [1,2,3]. The first requirement corresponds to the fixedpoint fast revisit capability, which is primarily influenced by the timeliness of the satellites [4, 5]; for instance, satellites can generally provide realtime images of disaster areas within a few minutes in natural disaster events [6]. The second requirement corresponds to the prompt updating capacity for a largescale area, which mainly depends on the swath width of the satellite. This aspect can facilitate the rapid monitoring of construction areas [7, 8], daily distribution survey of marine vessels [9], and agricultural surveys, among other applications, in which largescale time series satellite images must be acquired in a small period.
Changguang is in the process of deploying the “Jilin1” optical remote sensing satellite constellation in two phases [10, 11]: The first phase involves placing 60 satellites in orbit, thereby allowing the revisitation of key regions worldwide within 30 min and the observation of more than 800 target areas worldwide every day. In the second phase, 138 satellites will be present in orbit, thereby enabling the revisitation of any area worldwide within 10 min. The first batch of satellites of the “Jilin1” optical remote sensing constellation, including the optical A satellite, smart video 01/02 satellite, and smart verification satellite, was launched successfully on October 15, 2015, and these satellites have been in orbit for 4.5 years. Subsequently, the video 03–08 satellites were launched sequentially. The Jilin1KF01A satellite (the Hongqi1H9 widerange satellite, hereafter referred to as the Hongqi1H9 widerange satellite), which was successfully launched on January 15, 2020, is the largest submeterlevel satellite worldwide and the first tonlevel commercial remote sensing satellite in China, with a resolution of less than 1 m and a swath width of 136 km. The Hongqi1H9 widerange satellite can acquire submeter image data at a rate of approximately 1000 km\(^{2}\) per second and the fullcoverage image information for an area of more than 1000,000 km\(^{2}\). The sensor information for the Hongqi1H9 widerange satellite is presented in Table 1 [12].
In general, the resolution and swath width of satellite images are inversely related, that is, the swath width decreases as the resolution increases [13]. Conventionally, the satellite swath width is increased by stitching multiple lenses whose optical axis does not point to the center of the Earth [10]. However, this type of optical imaging system is only suitable when the field of view is not excessively large (approximately 10\(^\circ\)). According to Table 1, the field of view of the Hongqi1H9 widerange satellite is 16.1\(^\circ\). Consequently, applying multilens stitching may significantly increase the difference in the pixel resolution between the edge and center of the image plane [14]. Moreover, the shift differences in the images caused by the curvature and rotation of the Earth, among other factors, may lead to different sampling effects at different viewing positions, leading to a deteriorated image quality [15]. The Hongqi1H9 widerange satellite avoids the projection distortion caused by multiple lenses by using a single lens whose optical axis points to the center of the Earth. In this case, the resolutions of the center and edge of the field of view are nearly equivalent, thereby facilitating the image processing [13].
Nevertheless, a single lens cannot be used to achieve a focal length of 4850 mm and field of view of 16.1\(^\circ\). In particular,the Hongqi1H9 widerange adopts the Cook threemirror anastigmat (TMA) system. As shown in Fig. 1 [16,17,18], the Cook TMA imaging system is mainly composed of three mirrors: primary mirror, secondary mirror and third mirror. The main purpose is to minimize the impact of three optical aberrations including spherical aberration, coma aberration, and astigmatism on sensor imaging. Furthermore, the Cook TMA system can eliminate the central block from the aperture by increasing the offaxis field of view [17]. Such that, the clear aperture of the field of view and the mirror is completely offaxis, forming a coaxial system in which the field of view and aperture are offaxis. So the integration of three mirrors not only can reduce the aberrations, but also greatly enhance the field of view. In this configuration, the position change between any two mirrors approximately 1 m apart is not more than 5 \(\upmu\)m, the shape of the large aspheric mirror corresponds to a wavelength of more than 1/50, and the original dynamic modulation transfer function is larger than 0.16 [12]. Consequently, the imaging clarity and geometric accuracy can be enhanced even when vibration and temperature changes occur.
The geometric positioning accuracy is very important for a newly launched satellite sensor, and the excellent performance of geometric positioning of a newly launched satellite will greatly broaden its application field. Considering the characteristics of the Hongqi1H9 widerange satellite, the objective of this study was to evaluate a novel optical satellite sensor and analyze the geometric positioning accuracy of the Hongqi1H9 widerange satellite in areas with three different topographies, specifically, urban, plain, and mountainous areas. From the experimental study, several conclusions were obtained regarding the newly launched Hongqi1H9 widerange satellite. It was noted that the basic product could realize regional mapping and meet the application requirements. The contributions of this paper are as follow: (1) The imagery obtained through the newly launched Hongqi1H9 widerange satellite was evaluated and analyzed in terms of the circle error (CE) accuracy, vendorprovided rational polynomial coefficient (RPC)based direct geometric positioning accuracy and ground control point (GCP)based absolute positioning accuracy; (2) The experimental results are comprehensively compared in three different terrains.
The remaining paper is organized as follows. After the introduction of the Hongqi1H9 widerange satellite, Sect. 2 introduces the geometric positioning methods and criteria. Section 3 describes the study area and data used. The experimental results and discussions are presented in Sect. 4, and the concluding remarks are presented in Sect. 5.
Methods
Generally, satellite images can be used to analyze the geometric positioning accuracy by using two approaches [20]. In the first approach, highperformance sensor structures and parameters can be used to realize the geometric transformation from the image space to the ground space [21,22,23]. The second approach is based on the use of a rational function model (RFM), which exploits the constraints between different images [25,26,27]. Nevertheless, the error contained in the RPCs may destroy the photogrammetric relation and deteriorate the geometric performance of the obtained highresolution images. In particular, the accuracy of the first evaluation approach is more accurate. In this work, a datadriven evaluation method was employed, as described in the following subsections.
Preprocessing
In general, the vendorprovided RPCs can replace the position and attitude parameters of satellite sensors [28]. Different RPCs for different data processing phases, containing different degrees of errors, can be defined according to the exterior orientation parameters by using the rigorous sensor model (RSM) [29, 30]. In this study, the existing RPCs were extracted through radiation and geometric correction. These RPCs were solved using a terrainindependent method. Specifically, first, image grids were established in the image space, and later, a threedimensional (3D) coordinate grid area was established in the ground space. In this process, the RSM calculated the point coordinates of the ground grids, and the ground 3D grids were divided into more than three layers in the elevation direction. Finally, the RPCs were calculated using the least squares method according to the established image and ground grids [31]. For convenience, all the satellite imagery data, GPS points, and accuracy results were defined according to the World Geodetic System 1984.
RPCsbased block adjustment model
The RFM is a traditional expression of the satellite sensor model, in which rational polynomials are used to ensure the correspondence between the image and ground points, as indicated in Eq. (1).
where \((x_n,y_n)\) represent normalized image coordinates, corresponding to the normalized coordinates \((B_n,L_n,Z_n)\) in the ground space. \(Num_i(B_n,L_n,Z_n) (i=1,2)\) and \(Den_i(B_n,L_n,Z_n) (i=1,2)\) denote the rational polynomials. As described in literature [32], linear polynomials are used to correct the distortions caused be optical projection; quadratic polynomials are used to correct the errors induced by the Earth curvature, lens distortion, and atmospheric refraction; and the other unknown distortions are compensated using the cubic polynomial.
Compared with that in ground space, the compensation in image space is more rigorous theoretically [33], as indicated in Eq. (2).
where \((x',y')\) denote the image points measured corresponding to the ground points; \((x,y)\) denote the image coordinate values of the ground points calculated using Eq. (2); \((a_0)\) and \((b_0)\) denote the shift orientation parameters; and \(a_i(i=0,1,2)\) and \(b_i(i=0,1,2)\) denote the affine transformation orientation parameters, where \(a_i(i=0,1,2)\) and \(b_i(i=0,1,2)\) are used to correct errors in column and row directions, respectively.
Therefore, the RPCsbased block adjustment model can be constructed in matrix form as shown in Eq. (3), according to Eqs. (1) and (2) [34, 35]:
where
Accuracy evaluation
In this work, the geometric positioning accuracy of the Hongqi1H9 widerange satellite imagery under three different terrains was evaluated considering controlbased and noncontrolbased geometric positioning accuracies. Among these, the noncontrolbased geometric positioning accuracy included two parts: accuracy evaluation based on circular probability errors and on direct forward intersection by using vendorprovided RPCs [36, 37].
To examine the controlbased geometric positioning accuracy and that based on direct forward intersection by using the vendorprovided RPCs, highprecision Global Positioning System (GPS) measured points \((B_{GPS},L_{GPS},H_{GPS})\) and their corresponding solved coordinate values \((B_i,L_i,H_i)(i=1,2,\cdot \cdot \cdot ,n)\) were determined to obtain the root mean squared errors (RMSEs), as shown in Eq. (4).
The accuracy evaluation based on circular probability errors [38] was performed in three phases. (1) Obtaining two geometric positioning error sets X and Y in the longitude and latitude directions, respectively, which correspond to the differences between the point coordinates measured on the image and the corresponding GPS measured points. (2) Determining the means \(\mu _x\) and \(\mu _y\), RMSEs \(\sigma _x\) and \(\sigma _y\) , and correlation coefficient \(\rho\) for sets X and Y. (3) Ensuring that the geometric positioning errors with systematic errors and strong correlations in all the directions follow a normal distribution. The joint density function in the polar coordinate system was defined as in Formula (5) [39]:
where
The CE90 was solved to measure the noncontrolbased geometric positioning accuracy.
Study area and data
The considered study areas are located in three regions with different terrains in China (Fig. 2). The urban area has many highrise buildings, and the plain and mountainous areas have rough terrains. These feature ranges are considerably different in terms of the terrains and surface coverage. The urban, plain, and mountainous study areas cover approximately 550 km\(^{2}\), 600 km\(^{2}\), and 720 km\(^{2}\), respectively. The urban and plain areas traverse the altitudinal range of 0–150 m. The mountainous area exhibit a high variability of slopes with varying orientations of the ridges and deep valleys; moreover, this area includes few notable water bodies.
The satellite images of the three study areas were acquired during the winter when the surface vegetation coverage was relatively simple. Moreover, the overlaps of the stereo images for the three areas were more than 80%, and the ground sampling distance was approximately 0.75 m. Figure 2 illustrates the coverage of the three study areas with different terrains in China. The urban area ranged from 121.267\(^\circ\)E to 121.592\(^\circ\)E and from 30.018\(^\circ\)N to 31.316\(^\circ\)N in the longitudinal and latitudinal directions, respectively, and the imagery data were collected in February 2020. The plain area ranged from 120.90\(^\circ\)E to 121.338\(^\circ\)E and from 30.90\(^\circ\)N to 31.20\(^\circ\)N in the longitudinal and latitudinal directions, respectively, and the satellite imagery data were collected in 2020, with a field of view of 16.1\(^\circ\). The mountainous area ranged from 100.60\(^\circ\)E to 101.228\(^\circ\)E and from 25.042\(^\circ\)N to 25.3\(^\circ\)N in the longitudinal and latitudinal directions, respectively, and the satellite imagery data were acquired in March, 2020.
To perform absolute accuracy assessments, accurate and independent reference data are required [40, 41]. The reference data should be at least three times more accurate than the evaluated data [42]. Therefore, in this work, we considered highquality GPS points, which satisfy the accuracy requirement, and thus, do not adversely affect the evaluation. For the urban, plain, and mountainous areas, the number of GPS points for the comparative experiments and accuracy assessment was 32, 18, and 25, respectively.
Results and discussion
To analyze the geometric positioning accuracy of the Hongqi1H9 satellite imagery in three different terrains, the controlbased accuracy and the noncontrolbased accuracy are regarded as two significant evaluation criteria. For the controlbased accuracy, it has been used many engineering application fields, such as mapping and navigation. And the noncontrolbased accuracy indicates the performance of geometric location without introducing any aided information such as GPS measured points into the bundle adjustment process. Excellent noncontrol positioning performance be greatly timesaving and cheap in the engineering application areas where effective control information cannot be obtained. In this study, the noncontrolbased geometric positioning accuracy was evaluated based on circular probability errors and residuals of direct forward intersection.
Analysis of geometric positioning accuracy without ground control points
The geometric positioning accuracy of the Hongqi1H9 widerange satellite imagery without using ground control points involved two parts: accuracy evaluation based on circular probability errors and that of the direct forward intersection by using vendorprovided RPCs.
Accuracy analysis based on circular probability errors
The accuracy based on the circular probability errors was calculated according to the three phases described in Sect. 2.3. The residuals, including the errors in the latitude and longitude directions, for the Hongqi1H9 widerange satellite imagery under three different terrains are illustrated in Fig. 3. In Fig. 3, the x and y axes denote the residual values for the three study areas and the corresponding residual counts, respectively. In addition, the residual fitting results for the Hongqi1H9 widerange satellite imagery under three different terrains, obtained using normal distribution functions, are presented. It can be noted that the circular probability errorbased accuracy for the plain area has smaller confidence intervals in all the directions compared to those for the urban and mountainous areas. In particular, in the latitudinal direction, except for certain outliers caused by human factors, the geometric positioning accuracies of the Hongqi1H9 widerange satellite imagery in the plain and urban areas are approximately 3–5 m and less than 7 m, respectively, which are considerably superior than the accuracy for the mountainous area (approximately 10–16 m), nearly consistent with the positioning accuracy in the longitudinal direction. Moreover, in the longitudinal direction, the Hongqi1H9 widerange satellite images in the plain and urban areas exhibit nearly equivalent positioning performances (less than 5 m). The planar geometric positioning accuracy for the plain area is slightly superior than that for the urban area, although it is considerably higher than that for the mountainous area, as shown in Fig. 4. A possible explanation for this difference is that the stereo images in the mountain area have a weak intersection angle, which decreases the geometric positioning performance to a certain extent. In other words, the positioning performance in the mountainous area can be improved by improving the intersection condition.
Table 2 summarizes the results of the geometric positioning based on the circular probability errors. It can be noted that the images pertaining to the plain area (CE90 4.5051 m) correspond to a slightly higher positioning performance than that for the urban area (CE90 6.7216 m) and exhibit a smaller span of residuals, indicating the higher stability of positioning in the plain area. However, for the mountainous area, the maximum circular probability error in the planimetry direction is 15.5212 m. Therefore, the Hongqi1H9 widerange satellite imagery can exhibit a circle probability errorbased accuracy of less than 5 m, less than 7 m, and 15.5212 m in the plain, urban, and mountainous areas, respectively.
Accuracy analysis of direct forward intersection by using vendorprovided RPCs
After the radiometric correction, the vendorprovided RPCs were extracted from the structures and parameters of the RSM, which can be used to construct the RFM for the geometric positioning by replacing the RSM. In the experimental evaluation of the direct forward intersection using the vendorprovided RPCs, the accuracy of all the GPS points was less than 5 cm, and the weights were considered to be equivalent. For the corresponding feature points, highcriteria manual selection was adopted to ensure the subpixellevel characteristics, which can satisfy the requirements of the geometric positioning.
Figure 5 shows the results for the direct positioning accuracy obtained using the vendorprovided RPCs in the World Geodetic System 1984. The xaxis is separated into the planar and vertical accuracies, for each of which, the geometric positioning residuals and Gauss fitting curves of the three study areas are shown in the figure. The yaxis shows the corresponding residual values. It can be noted that the error values in both the planimetry and elevation directions are similar, even though the positioning accuracy in the mountainous area is worse than that in the plain and urban areas. Specifically, as indicated in Table 3, for the urban area, the mean errors in the planimetry and elevation directions are 17.3303 m and 11.3748 m, and the RMSEs are 17.8739 m and 11.6761 m, respectively. Similar to these values, the plain area exhibits, in the planimetry and vertical directions, mean errors of 15.9954 m and 12.2240 m, and RMSEs of 16.3902 m and 12.3994 m, respectively. In the mountainous area, the planar and vertical RMSEs are 21.2616 m and 17.4499 m, respectively. Overall, for all three terrains, the geometric positioning accuracy determined using the vendorprovided RPCs is less than 20 m and 15 m in the planimetry and vertical directions, respectively.
Moreover, the accuracy of the direct forward intersection obtained using the vendorprovided RPCs was worse than that based on the circular probability errors, as indicated by the comparison of the values presented in Tables 2 and 3. A possible explanation for this difference is that the vendorprovided RPCs still contain systematic errors, which considerably deteriorate the geometric positioning. Furthermore, the angles for the cross track stereo images are influence the direct positioning accuracy. In this regard, the geometric positioning accuracy can be improved by reducing the system errors in the vendorprovided RPCs.
Analysis of the absolute positioning accuracy
The absolute geometric positioning accuracy can be evaluated considering external orientation elements or GCPs, using the external reference values as a comparison benchmark to reflect the deviation indicated by the RMSEs. As a significant evaluation criterion, it can indicate the accuracy and performance of the satellite imagery for any geometric location. As mentioned previously, 32, 18, and 25 GPS points were measured for the urban, plain, and mountainous areas, respectively. In this experiment, five GPS points having nearly equivalent distributions were selected as the control points, and the remaining GPS points were used to evaluate the accuracy. Moreover, the affine transformation model was used for the bias compensation in the image space.
Figure 6 shows the geometric positioning error bar graphs using the five GCPs. The black crosses represent the point positions in the World Geodetic System 1984, and the blue and red arrows indicate the plane and elevation errors, respectively. As shown in Fig. 5, the Hongqi1H9 widerange satellite imagery under three different terrains exhibit different geometric positioning performances, all of which are sufficient to realize highresolution mapping.
The results of the absolute positioning accuracy are summarized in Table 4. The geometric positioning accuracy is presented in terms of the latitudinal, longitudinal, and vertical direction. From Table 4, it can be noted that the Hongqi1H9 widerange satellite exhibits the highest geometric positioning performance in the plain area, with a positioning accuracy of 3.2448 m, 1.6639 m, and 1.7466 m in the latitudinal, longitudinal, and elevation directions, respectively, when using the five GPS points. For the urban area, the positioning accuracy is slightly poor: 3.4815 m, 4.4756 m, and 2.7262 m in the latitudinal, longitudinal, and elevation directions, respectively. The worst geometric positioning corresponds to the mountainous area, with accuracies of 4.2622 m, 4.9386 m, and 4.9217 m in the latitudinal, longitudinal, and elevation directions, respectively. Overall, based on the experimental data, it can be considered that the Hongqi1H9 widerange satellite imagery can achieve a high positioning accuracy in the planar and vertical directions under different terrains. Specifically, for areas with a low topography and few surface structures, the geometric positioning accuracy of the Hongqi1H9 widerange satellite imagery can be less than 4 m and 2 m in the planimetry and elevation directions, and thus, the Hongqi1H9 widerange satellite images exhibit the excellent performance of geometric positioning and can be applied to many science experiments and engineering applications in the future, such as land surveying and mapping, agricultural estimation and analysis, target detection, and such applications.
Conclusions
In this work, we attempt to exam the positioning accuracy for the Hongqi1H9 widerange satellite images under regions with three different topographies, specifically, urban, plain, and mountainous areas. Three different main experiments were performed. The experimental results clarified the geometric positioning performance under three different areas with different terrains. From these findings, several key conclusions were drawn as follows:

(1)
In the experiments, the Hongqi1H9 satellite imagery could achieve a circle probability errorbased accuracy of less than 16 m without using any GCPs, which is sufficient for medium resolution mapping.

(2)
Under all three terrains, the residuals of forward intersection based on RFM was less than 20 m and approximately 15 m in planar and vertical directions, respectively, and the positioning accuracy in mountainous area was still worse than in plain and urban areas.

(3)
The Hongqi1H9 satellite imagery could achieve a high absolute positioning accuracy in planar and vertical directions under different terrains. In particular, for our experimental areas with a low topography and few surface structures, the absolute positioning accuracy was less than 4 and 2 m in planar and vertical directions, respectively.
Overall, the Hongqi1H9 satellite exhibits not only an excellent fixedpoint revisitation capability and prompt updating capacities for a largescale area, but also a high positioning performance through the acrosstrack stereo imagery. In future research, the Hongqi1H9 satellite can be used in many science experiments and engineering applications, such as land surveying and mapping, agricultural estimation and analysis, target detection, and such applications.
Availability of data and materials
Data sharing not applicable to this article as no datasets were generated or analyzed during the current study.
Abbreviations
 TMA::

Threemirror anastigmat
 RPC::

Rational polynomial coefficient
 CE::

Circle error
 GCP::

Ground control point
 RFM::

Rational function model
 RSM::

Rigorous sensor model
 3D::

Three dimensional
 GPS::

Global Positioning System
 WGS84::

World Geodetic System1984
 RMSEs::

Root mean squared errors
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Acknowledgements
The authors would like to thank Mr. Changling Niu from Qingdao Geotechnical Investigation Surveying Research Insititute for his suggestions on this research work. The authors also would like to appreciate the data support from Changguang Satellite Technology Co., LTD, Changchun, China.
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WPS and JXW performed the experiments and wrote the manuscript. JXW advised on the manuscript and provided funding support. YB revised the manuscript. XL, SQT, and XYQ provided the experimental data. All authors read and approved the final manuscript.
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Song, W., Wang, J., Bai, Y. et al. Optical satellite sensor and positioning accuracy analysis for the Hongqi1H9 widerange satellite in different terrains. J Wireless Com Network 2021, 3 (2021). https://doi.org/10.1186/s13638020018761
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Keywords
 Geometric positioning
 Different terrains
 The Hongqi1H9 satellite
 Accuracy analysis